# Verify Code

A two-factor screen with a six-digit code input, a resend timer and a confirmation once verified.

Verify Code is an open-source mobile screen from suiss/uim for React Native and Expo, with SwiftUI and Jetpack Compose versions built from the same design tokens. The @esuiss/uim CLI copies its source into your project, so you own the code.

Source: https://uim.suiss.app/docs/blocks/verify-code

![Preview](https://uim.suiss.app/previews/blocks-verify-code--default.light.webp)

```tsx title="uniwind/components/blocks/verify-code.tsx"
import { cn } from "cn"
import { CheckIcon, LockSimpleIcon } from "phosphor-react-native"
import * as React from "react"
import { Pressable, View } from "react-native"
import {
  FadeInDown,
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withTiming,
} from "react-native-reanimated"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  InputOTP,
  InputOTPGroup,
  InputOTPSlot,
} from "@/components/ui/input-otp"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"

const DEMO_CODE = "482913"

const SHAKE = [-10, 9, -6, 4, 0]

const STEP = { duration: 70, reduceMotion: ReduceMotion.System }

type Status = "idle" | "error" | "ok"

function LinkText({
  onPress,
  children,
}: {
  onPress?: () => void
  children: React.ReactNode
}) {
  return (
    <Pressable
      role="link"
      hitSlop={8}
      onPress={onPress}
      className="active:opacity-60"
    >
      <Text className="text-sm text-link">{children}</Text>
    </Pressable>
  )
}

function VerifyCode({
  onHelp,
  onVerify = (code) => code === DEMO_CODE,
}: {
  onHelp?: () => void
  onVerify?: (code: string) => boolean | Promise<boolean>
}) {
  const verifyRef = React.useRef(onVerify)
  verifyRef.current = onVerify
  const [code, setCode] = React.useState("")
  const [status, setStatus] = React.useState<Status>("idle")
  const [checking, setChecking] = React.useState<string | null>(null)
  const [left, setLeft] = React.useState(30)
  const offset = useSharedValue(0)

  const shakeStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }],
  }))

  React.useEffect(() => {
    if (left <= 0) return
    const timer = setTimeout(() => setLeft(left - 1), 1000)
    return () => clearTimeout(timer)
  }, [left])

  React.useEffect(() => {
    if (checking === null) return
    let active = true
    const timer = setTimeout(async () => {
      const valid = await verifyRef.current(checking)
      if (!active) return
      setChecking(null)
      if (valid) return setStatus("ok")
      setStatus("error")
      offset.value = withSequence(...SHAKE.map((x) => withTiming(x, STEP)))
    }, 200)
    return () => {
      active = false
      clearTimeout(timer)
    }
  }, [checking, offset])

  React.useEffect(() => {
    if (status !== "error") return
    const timer = setTimeout(() => {
      setCode("")
      setStatus("idle")
    }, 800)
    return () => clearTimeout(timer)
  }, [status])

  if (status === "ok") {
    return (
      <Screen>
        <View className="flex-1 items-center justify-center p-6">
          <AnimatedView
            entering={FadeInDown.duration(600).reduceMotion(
              ReduceMotion.System
            )}
            className="items-center gap-3.5"
          >
            <View className="size-19 items-center justify-center rounded-full bg-success">
              <Icon
                as={CheckIcon}
                weight="bold"
                className="size-9.5 text-on-accent"
              />
            </View>
            <Text role="heading" className="text-3xl font-semibold">
              Verified.
            </Text>
            <Text className="text-center text-lg text-label-secondary">
              This device is now trusted. You won't be asked for a code next
              time.
            </Text>
            <Pressable
              role="link"
              hitSlop={8}
              onPress={() => {
                setCode("")
                setStatus("idle")
              }}
              className="active:opacity-60"
            >
              <Text className="text-lg text-link">Start over ›</Text>
            </Pressable>
          </AnimatedView>
        </View>
      </Screen>
    )
  }

  return (
    <Screen>
      <KeyboardScrollView contentContainerClassName="grow items-center justify-center px-6 py-8">
        <View className="size-16 items-center justify-center rounded-full bg-surface-secondary">
          <Icon
            as={LockSimpleIcon}
            weight="bold"
            className="size-7.5 text-accent"
          />
        </View>
        <Text
          role="heading"
          className="mt-5 text-center text-3xl font-semibold"
        >
          Two-factor authentication
        </Text>
        <Text className="mt-3 mb-7.5 text-center text-lg text-label-secondary">
          Enter the 6-digit code sent to your trusted devices.
        </Text>
        <AnimatedView style={shakeStyle}>
          <InputOTP
            autoFocus
            length={6}
            value={code}
            onValueChange={(value) => {
              setCode(value)
              setStatus("idle")
            }}
            onValueComplete={setChecking}
            accessibilityLabel="Verification code"
            className="gap-4"
          >
            {[
              [0, 1, 2],
              [3, 4, 5],
            ].map((group) => (
              <InputOTPGroup key={group[0]} className="gap-2.5">
                {group.map((index) => (
                  <InputOTPSlot
                    key={index}
                    index={index}
                    className={(state) =>
                      cn(
                        "h-14 w-11 rounded-xl border bg-transparent",
                        status === "error"
                          ? "border-danger"
                          : state.active
                            ? "border-accent"
                            : "border-separator-strong"
                      )
                    }
                  />
                ))}
              </InputOTPGroup>
            ))}
          </InputOTP>
        </AnimatedView>
        <Text
          accessibilityLiveRegion="polite"
          className={cn(
            "mt-3.5 min-h-5 text-sm",
            status === "error" ? "text-danger" : "text-label-secondary"
          )}
        >
          {status === "error" ? "Incorrect code." : `Demo code: ${DEMO_CODE}`}
        </Text>
        <View className="mt-6 items-center gap-2.5">
          {left > 0 ? (
            <Text className="text-sm text-label-secondary tabular-nums">
              Resend code · 0:{String(left).padStart(2, "0")}
            </Text>
          ) : (
            <LinkText onPress={() => setLeft(30)}>Resend code ›</LinkText>
          )}
          <LinkText onPress={onHelp}>
            Didn't get a verification code? ›
          </LinkText>
        </View>
      </KeyboardScrollView>
    </Screen>
  )
}

export { VerifyCode }
```

```swift title="swift/Blocks/VerifyCode.swift"
import PhosphorSwift
import SwiftUI

public struct VerifyCode: View {
  enum Status: Sendable {
    case idle, error, ok
  }

  static let demoCode = "482913"

  private var onHelp: (() -> Void)?
  private var onVerify: (String) async -> Bool = { $0 == "482913" }
  @State private var code: String
  @State private var status: Status
  @State private var left: Int
  @State private var shakes = 0
  @State private var focused = true
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    onVerify: @escaping (String) async -> Bool = { $0 == "482913" },
    onHelp: (() -> Void)? = nil
  ) {
    self.init(code: "", status: .idle, left: 30)
    self.onVerify = onVerify
    self.onHelp = onHelp
  }

  init(code: String, status: Status, left: Int) {
    _code = State(initialValue: code)
    _status = State(initialValue: status)
    _left = State(initialValue: left)
  }

  public var body: some View {
    Screen {
      if status == .ok {
        verified
          .transition(.opacity.combined(with: .offset(y: 18)))
      } else {
        form
      }
    }
    .animation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.6), value: status == .ok)
    .task(id: left) {
      guard left > 0 else { return }
      try? await Task.sleep(for: .seconds(1))
      guard !Task.isCancelled else { return }
      left -= 1
    }
  }

  private var form: some View {
    KeyboardScrollView {
      VStack(spacing: 0) {
        Ph.lockSimple.bold
          .frame(width: 30, height: 30)
          .foregroundStyle(Color.accent)
          .frame(width: 64, height: 64)
          .background(Color.surfaceSecondary, in: Circle())
          .accessibilityHidden(true)
        Text("Two-factor authentication")
          .scaledTextStyle(.xl2, weight: .bold)
          .padding(.top, 20)
        Text("Enter the 6-digit code sent to your trusted devices.")
          .scaledTextStyle(.lg)
          .foregroundStyle(Color.labelSecondary)
          .padding(.top, 12)
          .padding(.bottom, 30)
        InputOTP(text: $code, length: 6) {
          InputOTPGroup {
            ForEach(0..<3, id: \.self) { InputOTPSlot(index: $0) }
          }
          .padding(.trailing, 8)
          InputOTPGroup {
            ForEach(3..<6, id: \.self) { InputOTPSlot(index: $0) }
          }
        }
        .invalid(status == .error)
        .environment(\.inputOTPFocus, $focused)
        .shake(trigger: shakes)
        .hapticFeedback(.error, trigger: shakes)
        .onChange(of: code) { _, value in
          if status == .error && !value.isEmpty { status = .idle }
          if value.count == 6 { complete(value) }
        }
        .accessibilityLabel(Text("Verification code"))
        Text(status == .error ? "Incorrect code." : "Demo code: \(Self.demoCode)")
          .scaledFont(.sm)
          .foregroundStyle(status == .error ? Color.danger : .labelSecondary)
          .frame(minHeight: 20)
          .padding(.top, 14)
        VStack(spacing: 10) {
          if left > 0 {
            Text("Resend code · 0:\(String(format: "%02d", left))")
              .scaledFont(.sm)
              .monospacedDigit()
              .foregroundStyle(Color.labelSecondary)
              .frame(minHeight: 32)
          } else {
            Button("Resend code ›") { left = 30 }
              .buttonStyle(VerifyCodeLinkStyle())
          }
          Button("Didn't get a verification code? ›") { onHelp?() }
            .buttonStyle(VerifyCodeLinkStyle())
        }
        .padding(.top, 24)
      }
      .multilineTextAlignment(.center)
      .fixedSize(horizontal: false, vertical: true)
      .frame(maxWidth: .infinity)
      .padding(.horizontal, 24)
      .padding(.top, 72)
      .padding(.bottom, 24)
    }
  }

  private var verified: some View {
    VStack(spacing: 14) {
      Ph.check.bold
        .frame(width: 38, height: 38)
        .foregroundStyle(Color.onAccent)
        .frame(width: 76, height: 76)
        .background(Color.success, in: Circle())
        .accessibilityHidden(true)
      Text("Verified.")
        .scaledTextStyle(.xl2, weight: .bold)
      Text("This device is now trusted. You won't be asked for a code next time.")
        .scaledTextStyle(.lg)
        .foregroundStyle(Color.labelSecondary)
      Button("Start over ›") {
        code = ""
        status = .idle
      }
      .buttonStyle(VerifyCodeLinkStyle(style: .lg))
    }
    .multilineTextAlignment(.center)
    .fixedSize(horizontal: false, vertical: true)
    .padding(24)
    .frame(maxWidth: .infinity, maxHeight: .infinity)
  }

  private func complete(_ value: String) {
    Task {
      try? await Task.sleep(for: .milliseconds(200))
      if await onVerify(value) {
        focused = false
        status = .ok
        return
      }
      status = .error
      shakes += 1
      try? await Task.sleep(for: .milliseconds(800))
      code = ""
      status = .idle
    }
  }
}

private struct VerifyCodeLinkStyle: ButtonStyle {
  var style: TextStyle = .sm

  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .scaledFont(style)
      .foregroundStyle(Color.link)
      .opacity(configuration.isPressed ? 0.5 : 1)
      .frame(minHeight: 32)
      .contentShape(Rectangle())
  }
}
```

```kt title="kotlin/blocks/VerifyCode.kt"
package com.esuiss.ui.blocks

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Bold
import com.adamglin.phosphoricons.bold.Check
import com.adamglin.phosphoricons.bold.LockSimple
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.InputOTPGroup
import com.esuiss.ui.components.InputOTPSlot
import com.esuiss.ui.components.KeyboardScrollView
import com.esuiss.ui.components.Screen
import com.esuiss.ui.interactions.OtpAutofill
import com.esuiss.ui.interactions.OtpAutofillInput
import com.esuiss.ui.interactions.OtpAutofillState
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography
import kotlinx.coroutines.delay

private const val DemoCode = "482913"

private val RevealEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

@Composable
fun VerifyCode(
    modifier: Modifier = Modifier,
    onVerify: suspend (code: String) -> Boolean = { it == DemoCode },
    onHelp: () -> Unit = {},
) {
    val colors = EsuissTheme.colors
    val verify by rememberUpdatedState(onVerify)
    var verified by rememberSaveable { mutableStateOf(false) }
    var attempt by remember { mutableIntStateOf(0) }
    var left by rememberSaveable { mutableIntStateOf(30) }

    LaunchedEffect(left) {
        if (left <= 0) return@LaunchedEffect
        delay(1000)
        left -= 1
    }

    Screen(modifier) {
        if (verified) {
            Success {
                verified = false
                attempt += 1
            }
            return@Screen
        }
        BoxWithConstraints(Modifier.fillMaxSize()) {
            val height = maxHeight
            KeyboardScrollView(Modifier.fillMaxSize()) {
                Column(
                    modifier = Modifier
                        .fillMaxWidth()
                        .heightIn(min = height)
                        .padding(24.dp),
                    verticalArrangement = Arrangement.Center,
                    horizontalAlignment = Alignment.CenterHorizontally,
                ) {
                    Box(
                        Modifier
                            .size(64.dp)
                            .background(colors.surfaceSecondary, CircleShape),
                        contentAlignment = Alignment.Center,
                    ) {
                        Icon(PhosphorIcons.Bold.LockSimple, contentDescription = null, size = 30.dp, tint = colors.accent)
                    }
                    Spacer(Modifier.height(20.dp))
                    BasicText(
                        "Two-factor authentication",
                        modifier = Modifier.semantics { heading() },
                        style = Typography.xl3.copy(color = colors.label, fontWeight = FontWeight.SemiBold, textAlign = TextAlign.Center),
                    )
                    Spacer(Modifier.height(12.dp))
                    BasicText(
                        "Enter the 6-digit code sent to your trusted devices.",
                        style = Typography.lg.copy(color = colors.labelSecondary, textAlign = TextAlign.Center),
                    )
                    Spacer(Modifier.height(30.dp))
                    key(attempt) {
                        OtpAutofill(
                            maxLength = 6,
                            onVerify = { code ->
                                val ok = verify(code)
                                if (ok) {
                                    delay(500)
                                    verified = true
                                }
                                ok
                            },
                        ) {
                            OtpAutofillInput(contentDescription = "Verification code") {
                                InputOTPGroup(Modifier.padding(end = 8.dp)) {
                                    repeat(3) { InputOTPSlot(it) }
                                }
                                InputOTPGroup {
                                    repeat(3) { InputOTPSlot(it + 3) }
                                }
                            }
                            val invalid = state == OtpAutofillState.Invalid
                            BasicText(
                                if (invalid) "Incorrect code." else "Demo code: $DemoCode",
                                modifier = Modifier
                                    .heightIn(min = 20.dp)
                                    .semantics { liveRegion = LiveRegionMode.Polite },
                                style = Typography.sm.copy(
                                    color = if (invalid) colors.danger else colors.labelSecondary,
                                    textAlign = TextAlign.Center,
                                ),
                            )
                        }
                    }
                    Spacer(Modifier.height(24.dp))
                    Column(
                        horizontalAlignment = Alignment.CenterHorizontally,
                        verticalArrangement = Arrangement.spacedBy(10.dp),
                    ) {
                        if (left > 0) {
                            BasicText(
                                "Resend code · 0:${left.toString().padStart(2, '0')}",
                                style = Typography.sm.copy(color = colors.labelSecondary, fontFeatureSettings = "tnum"),
                            )
                        } else {
                            LinkText("Resend code ›") {
                                left = 30
                            }
                        }
                        LinkText("Didn't get a verification code? ›", onHelp)
                    }
                }
            }
        }
    }
}

@Composable
private fun LinkText(text: String, onClick: () -> Unit) {
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    BasicText(
        text,
        modifier = Modifier
            .graphicsLayer { alpha = if (pressed) 0.5f else 1f }
            .clickable(interactionSource = interaction, indication = null, role = Role.Button, onClick = onClick)
            .padding(vertical = 4.dp),
        style = Typography.sm.copy(color = EsuissTheme.colors.link, textAlign = TextAlign.Center),
    )
}

@Composable
private fun Success(onStartOver: () -> Unit) {
    val colors = EsuissTheme.colors
    val appear = remember { Animatable(0f) }
    LaunchedEffect(Unit) { appear.animateTo(1f, tween(1000, easing = RevealEasing)) }
    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(24.dp)
            .graphicsLayer {
                alpha = appear.value
                translationY = (1f - appear.value) * 18.dp.toPx()
            },
        verticalArrangement = Arrangement.spacedBy(14.dp, Alignment.CenterVertically),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        Box(
            Modifier
                .size(76.dp)
                .background(colors.success, CircleShape),
            contentAlignment = Alignment.Center,
        ) {
            Icon(PhosphorIcons.Bold.Check, contentDescription = null, size = 38.dp, tint = colors.onAccent)
        }
        BasicText(
            "Verified.",
            modifier = Modifier.semantics { heading() },
            style = Typography.xl3.copy(color = colors.label, fontWeight = FontWeight.SemiBold),
        )
        BasicText(
            "This device is now trusted. You won't be asked for a code next time.",
            style = Typography.lg.copy(color = colors.labelSecondary, textAlign = TextAlign.Center),
        )
        BasicText(
            "Start over ›",
            modifier = Modifier.clickable(
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                role = Role.Button,
                onClick = onStartOver,
            ),
            style = Typography.lg.copy(color = colors.link),
        )
    }
}
```

An `InputOTP` with six slots checks the code when the last digit is entered; a wrong code shakes the input and shows an error, and a correct one shows a verified screen. A resend link counts down from 30 seconds, and a help link sits below.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add verify-code
```

```bash title="Terminal"
npx @esuiss/uim@latest add verify-code --platform swift
```

```bash title="Terminal"
npx @esuiss/uim@latest add verify-code --platform kotlin
```

The CLI also adds what it builds on: [Icon](/docs/components/icon), [Input Otp](/docs/components/input-otp), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Screen](/docs/components/screen), [Text](/docs/components/text).

### Manual

**Uniwind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Input Otp](/docs/components/input-otp), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Screen](/docs/components/screen), [Text](/docs/components/text).

3. Copy the source into `components/blocks/verify-code.tsx`:

```tsx title="uniwind/components/blocks/verify-code.tsx"
import { cn } from "cn"
import { CheckIcon, LockSimpleIcon } from "phosphor-react-native"
import * as React from "react"
import { Pressable, View } from "react-native"
import {
  FadeInDown,
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withTiming,
} from "react-native-reanimated"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  InputOTP,
  InputOTPGroup,
  InputOTPSlot,
} from "@/components/ui/input-otp"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"

const DEMO_CODE = "482913"

const SHAKE = [-10, 9, -6, 4, 0]

const STEP = { duration: 70, reduceMotion: ReduceMotion.System }

type Status = "idle" | "error" | "ok"

function LinkText({
  onPress,
  children,
}: {
  onPress?: () => void
  children: React.ReactNode
}) {
  return (
    <Pressable
      role="link"
      hitSlop={8}
      onPress={onPress}
      className="active:opacity-60"
    >
      <Text className="text-sm text-link">{children}</Text>
    </Pressable>
  )
}

function VerifyCode({
  onHelp,
  onVerify = (code) => code === DEMO_CODE,
}: {
  onHelp?: () => void
  onVerify?: (code: string) => boolean | Promise<boolean>
}) {
  const verifyRef = React.useRef(onVerify)
  verifyRef.current = onVerify
  const [code, setCode] = React.useState("")
  const [status, setStatus] = React.useState<Status>("idle")
  const [checking, setChecking] = React.useState<string | null>(null)
  const [left, setLeft] = React.useState(30)
  const offset = useSharedValue(0)

  const shakeStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }],
  }))

  React.useEffect(() => {
    if (left <= 0) return
    const timer = setTimeout(() => setLeft(left - 1), 1000)
    return () => clearTimeout(timer)
  }, [left])

  React.useEffect(() => {
    if (checking === null) return
    let active = true
    const timer = setTimeout(async () => {
      const valid = await verifyRef.current(checking)
      if (!active) return
      setChecking(null)
      if (valid) return setStatus("ok")
      setStatus("error")
      offset.value = withSequence(...SHAKE.map((x) => withTiming(x, STEP)))
    }, 200)
    return () => {
      active = false
      clearTimeout(timer)
    }
  }, [checking, offset])

  React.useEffect(() => {
    if (status !== "error") return
    const timer = setTimeout(() => {
      setCode("")
      setStatus("idle")
    }, 800)
    return () => clearTimeout(timer)
  }, [status])

  if (status === "ok") {
    return (
      <Screen>
        <View className="flex-1 items-center justify-center p-6">
          <AnimatedView
            entering={FadeInDown.duration(600).reduceMotion(
              ReduceMotion.System
            )}
            className="items-center gap-3.5"
          >
            <View className="size-19 items-center justify-center rounded-full bg-success">
              <Icon
                as={CheckIcon}
                weight="bold"
                className="size-9.5 text-on-accent"
              />
            </View>
            <Text role="heading" className="text-3xl font-semibold">
              Verified.
            </Text>
            <Text className="text-center text-lg text-label-secondary">
              This device is now trusted. You won't be asked for a code next
              time.
            </Text>
            <Pressable
              role="link"
              hitSlop={8}
              onPress={() => {
                setCode("")
                setStatus("idle")
              }}
              className="active:opacity-60"
            >
              <Text className="text-lg text-link">Start over ›</Text>
            </Pressable>
          </AnimatedView>
        </View>
      </Screen>
    )
  }

  return (
    <Screen>
      <KeyboardScrollView contentContainerClassName="grow items-center justify-center px-6 py-8">
        <View className="size-16 items-center justify-center rounded-full bg-surface-secondary">
          <Icon
            as={LockSimpleIcon}
            weight="bold"
            className="size-7.5 text-accent"
          />
        </View>
        <Text
          role="heading"
          className="mt-5 text-center text-3xl font-semibold"
        >
          Two-factor authentication
        </Text>
        <Text className="mt-3 mb-7.5 text-center text-lg text-label-secondary">
          Enter the 6-digit code sent to your trusted devices.
        </Text>
        <AnimatedView style={shakeStyle}>
          <InputOTP
            autoFocus
            length={6}
            value={code}
            onValueChange={(value) => {
              setCode(value)
              setStatus("idle")
            }}
            onValueComplete={setChecking}
            accessibilityLabel="Verification code"
            className="gap-4"
          >
            {[
              [0, 1, 2],
              [3, 4, 5],
            ].map((group) => (
              <InputOTPGroup key={group[0]} className="gap-2.5">
                {group.map((index) => (
                  <InputOTPSlot
                    key={index}
                    index={index}
                    className={(state) =>
                      cn(
                        "h-14 w-11 rounded-xl border bg-transparent",
                        status === "error"
                          ? "border-danger"
                          : state.active
                            ? "border-accent"
                            : "border-separator-strong"
                      )
                    }
                  />
                ))}
              </InputOTPGroup>
            ))}
          </InputOTP>
        </AnimatedView>
        <Text
          accessibilityLiveRegion="polite"
          className={cn(
            "mt-3.5 min-h-5 text-sm",
            status === "error" ? "text-danger" : "text-label-secondary"
          )}
        >
          {status === "error" ? "Incorrect code." : `Demo code: ${DEMO_CODE}`}
        </Text>
        <View className="mt-6 items-center gap-2.5">
          {left > 0 ? (
            <Text className="text-sm text-label-secondary tabular-nums">
              Resend code · 0:{String(left).padStart(2, "0")}
            </Text>
          ) : (
            <LinkText onPress={() => setLeft(30)}>Resend code ›</LinkText>
          )}
          <LinkText onPress={onHelp}>
            Didn't get a verification code? ›
          </LinkText>
        </View>
      </KeyboardScrollView>
    </Screen>
  )
}

export { VerifyCode }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Input Otp](/docs/components/input-otp), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Screen](/docs/components/screen), [Text](/docs/components/text).

3. Copy the source into `components/blocks/verify-code.tsx`:

```tsx title="nativewind/components/blocks/verify-code.tsx"
import { cn } from "cn"
import { CheckIcon, LockSimpleIcon } from "phosphor-react-native"
import * as React from "react"
import { Pressable, View } from "react-native"
import {
  FadeInDown,
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withTiming,
} from "react-native-reanimated"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  InputOTP,
  InputOTPGroup,
  InputOTPSlot,
} from "@/components/ui/input-otp"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"

const DEMO_CODE = "482913"

const SHAKE = [-10, 9, -6, 4, 0]

const STEP = { duration: 70, reduceMotion: ReduceMotion.System }

type Status = "idle" | "error" | "ok"

function LinkText({
  onPress,
  children,
}: {
  onPress?: () => void
  children: React.ReactNode
}) {
  return (
    <Pressable
      role="link"
      hitSlop={8}
      onPress={onPress}
      className="active:opacity-60"
    >
      <Text className="text-sm text-link">{children}</Text>
    </Pressable>
  )
}

function VerifyCode({
  onHelp,
  onVerify = (code) => code === DEMO_CODE,
}: {
  onHelp?: () => void
  onVerify?: (code: string) => boolean | Promise<boolean>
}) {
  const verifyRef = React.useRef(onVerify)
  verifyRef.current = onVerify
  const [code, setCode] = React.useState("")
  const [status, setStatus] = React.useState<Status>("idle")
  const [checking, setChecking] = React.useState<string | null>(null)
  const [left, setLeft] = React.useState(30)
  const offset = useSharedValue(0)

  const shakeStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }],
  }))

  React.useEffect(() => {
    if (left <= 0) return
    const timer = setTimeout(() => setLeft(left - 1), 1000)
    return () => clearTimeout(timer)
  }, [left])

  React.useEffect(() => {
    if (checking === null) return
    let active = true
    const timer = setTimeout(async () => {
      const valid = await verifyRef.current(checking)
      if (!active) return
      setChecking(null)
      if (valid) return setStatus("ok")
      setStatus("error")
      offset.value = withSequence(...SHAKE.map((x) => withTiming(x, STEP)))
    }, 200)
    return () => {
      active = false
      clearTimeout(timer)
    }
  }, [checking, offset])

  React.useEffect(() => {
    if (status !== "error") return
    const timer = setTimeout(() => {
      setCode("")
      setStatus("idle")
    }, 800)
    return () => clearTimeout(timer)
  }, [status])

  if (status === "ok") {
    return (
      <Screen>
        <View className="flex-1 items-center justify-center p-6">
          <AnimatedView
            entering={FadeInDown.duration(600).reduceMotion(
              ReduceMotion.System
            )}
            className="items-center gap-3.5"
          >
            <View className="size-[4.75rem] items-center justify-center rounded-full bg-success">
              <Icon
                as={CheckIcon}
                weight="bold"
                className="size-[2.375rem] text-on-accent"
              />
            </View>
            <Text role="heading" className="text-3xl font-semibold">
              Verified.
            </Text>
            <Text className="text-center text-lg text-label-secondary">
              This device is now trusted. You won't be asked for a code next
              time.
            </Text>
            <Pressable
              role="link"
              hitSlop={8}
              onPress={() => {
                setCode("")
                setStatus("idle")
              }}
              className="active:opacity-60"
            >
              <Text className="text-lg text-link">Start over ›</Text>
            </Pressable>
          </AnimatedView>
        </View>
      </Screen>
    )
  }

  return (
    <Screen>
      <KeyboardScrollView contentContainerClassName="grow items-center justify-center px-6 py-8">
        <View className="size-16 items-center justify-center rounded-full bg-surface-secondary">
          <Icon
            as={LockSimpleIcon}
            weight="bold"
            className="size-[1.875rem] text-accent"
          />
        </View>
        <Text
          role="heading"
          className="mt-5 text-center text-3xl font-semibold"
        >
          Two-factor authentication
        </Text>
        <Text className="mt-3 mb-[1.875rem] text-center text-lg text-label-secondary">
          Enter the 6-digit code sent to your trusted devices.
        </Text>
        <AnimatedView style={shakeStyle}>
          <InputOTP
            autoFocus
            length={6}
            value={code}
            onValueChange={(value) => {
              setCode(value)
              setStatus("idle")
            }}
            onValueComplete={setChecking}
            accessibilityLabel="Verification code"
            className="gap-4"
          >
            {[
              [0, 1, 2],
              [3, 4, 5],
            ].map((group) => (
              <InputOTPGroup key={group[0]} className="gap-2.5">
                {group.map((index) => (
                  <InputOTPSlot
                    key={index}
                    index={index}
                    className={(state) =>
                      cn(
                        "h-14 w-11 rounded-xl border bg-transparent",
                        status === "error"
                          ? "border-danger"
                          : state.active
                            ? "border-accent"
                            : "border-separator-strong"
                      )
                    }
                  />
                ))}
              </InputOTPGroup>
            ))}
          </InputOTP>
        </AnimatedView>
        <Text
          accessibilityLiveRegion="polite"
          className={cn(
            "mt-3.5 min-h-5 text-sm",
            status === "error" ? "text-danger" : "text-label-secondary"
          )}
        >
          {status === "error" ? "Incorrect code." : `Demo code: ${DEMO_CODE}`}
        </Text>
        <View className="mt-6 items-center gap-2.5">
          {left > 0 ? (
            <Text className="text-sm text-label-secondary tabular-nums">
              Resend code · 0:{String(left).padStart(2, "0")}
            </Text>
          ) : (
            <LinkText onPress={() => setLeft(30)}>Resend code ›</LinkText>
          )}
          <LinkText onPress={onHelp}>
            Didn't get a verification code? ›
          </LinkText>
        </View>
      </KeyboardScrollView>
    </Screen>
  )
}

export { VerifyCode }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

```bash title="Terminal"
npx expo install phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Input Otp](/docs/components/input-otp), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Screen](/docs/components/screen), [Text](/docs/components/text).

3. Copy the source into `components/blocks/verify-code.tsx`:

```tsx title="stylesheet/components/blocks/verify-code.tsx"
import { CheckIcon, LockSimpleIcon } from "phosphor-react-native"
import * as React from "react"
import { Pressable, StyleSheet, View } from "react-native"
import {
  FadeInDown,
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withTiming,
} from "react-native-reanimated"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  InputOTP,
  InputOTPGroup,
  InputOTPSlot,
} from "@/components/ui/input-otp"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"
import { fontSize, radius, useTheme } from "@/components/ui/theme"

const DEMO_CODE = "482913"

const SHAKE = [-10, 9, -6, 4, 0]

const STEP = { duration: 70, reduceMotion: ReduceMotion.System }

type Status = "idle" | "error" | "ok"

const styles = StyleSheet.create({
  center: {
    flex: 1,
    alignItems: "center",
    justifyContent: "center",
    padding: 24,
  },
  stack: { alignItems: "center", gap: 14 },
  check: {
    width: 76,
    height: 76,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: radius.full,
  },
  title: { ...fontSize["3xl"], fontWeight: "600", textAlign: "center" },
  lead: { ...fontSize.lg, textAlign: "center" },
  content: {
    flexGrow: 1,
    alignItems: "center",
    justifyContent: "center",
    paddingHorizontal: 24,
    paddingVertical: 32,
  },
  lock: {
    width: 64,
    height: 64,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: radius.full,
  },
  slot: {
    height: 56,
    width: 44,
    borderRadius: radius.xl,
    borderWidth: 1,
    backgroundColor: "transparent",
  },
  hint: { ...fontSize.sm, marginTop: 14, minHeight: 20 },
  links: { marginTop: 24, alignItems: "center", gap: 10 },
})

function LinkText({
  onPress,
  children,
}: {
  onPress?: () => void
  children: React.ReactNode
}) {
  const { colors } = useTheme()
  return (
    <Pressable
      role="link"
      hitSlop={8}
      onPress={onPress}
      style={({ pressed }) => pressed && { opacity: 0.6 }}
    >
      <Text style={[fontSize.sm, { color: colors.link }]}>{children}</Text>
    </Pressable>
  )
}

function VerifyCode({
  onHelp,
  onVerify = (code) => code === DEMO_CODE,
}: {
  onHelp?: () => void
  onVerify?: (code: string) => boolean | Promise<boolean>
}) {
  const verifyRef = React.useRef(onVerify)
  verifyRef.current = onVerify
  const { colors } = useTheme()
  const [code, setCode] = React.useState("")
  const [status, setStatus] = React.useState<Status>("idle")
  const [checking, setChecking] = React.useState<string | null>(null)
  const [left, setLeft] = React.useState(30)
  const offset = useSharedValue(0)

  const shakeStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }],
  }))

  React.useEffect(() => {
    if (left <= 0) return
    const timer = setTimeout(() => setLeft(left - 1), 1000)
    return () => clearTimeout(timer)
  }, [left])

  React.useEffect(() => {
    if (checking === null) return
    let active = true
    const timer = setTimeout(async () => {
      const valid = await verifyRef.current(checking)
      if (!active) return
      setChecking(null)
      if (valid) return setStatus("ok")
      setStatus("error")
      offset.value = withSequence(...SHAKE.map((x) => withTiming(x, STEP)))
    }, 200)
    return () => {
      active = false
      clearTimeout(timer)
    }
  }, [checking, offset])

  React.useEffect(() => {
    if (status !== "error") return
    const timer = setTimeout(() => {
      setCode("")
      setStatus("idle")
    }, 800)
    return () => clearTimeout(timer)
  }, [status])

  if (status === "ok") {
    return (
      <Screen>
        <View style={styles.center}>
          <AnimatedView
            entering={FadeInDown.duration(600).reduceMotion(
              ReduceMotion.System
            )}
            style={styles.stack}
          >
            <View style={[styles.check, { backgroundColor: colors.success }]}>
              <Icon
                as={CheckIcon}
                weight="bold"
                size={38}
                color={colors.onAccent}
              />
            </View>
            <Text role="heading" style={styles.title}>
              Verified.
            </Text>
            <Text style={[styles.lead, { color: colors.labelSecondary }]}>
              This device is now trusted. You won't be asked for a code next
              time.
            </Text>
            <Pressable
              role="link"
              hitSlop={8}
              onPress={() => {
                setCode("")
                setStatus("idle")
              }}
              style={({ pressed }) => pressed && { opacity: 0.6 }}
            >
              <Text style={[fontSize.lg, { color: colors.link }]}>
                Start over ›
              </Text>
            </Pressable>
          </AnimatedView>
        </View>
      </Screen>
    )
  }

  return (
    <Screen>
      <KeyboardScrollView contentContainerStyle={styles.content}>
        <View
          style={[styles.lock, { backgroundColor: colors.surfaceSecondary }]}
        >
          <Icon
            as={LockSimpleIcon}
            weight="bold"
            size={30}
            color={colors.accent}
          />
        </View>
        <Text role="heading" style={[styles.title, { marginTop: 20 }]}>
          Two-factor authentication
        </Text>
        <Text
          style={[
            styles.lead,
            { marginTop: 12, marginBottom: 30, color: colors.labelSecondary },
          ]}
        >
          Enter the 6-digit code sent to your trusted devices.
        </Text>
        <AnimatedView style={shakeStyle}>
          <InputOTP
            autoFocus
            length={6}
            value={code}
            onValueChange={(value) => {
              setCode(value)
              setStatus("idle")
            }}
            onValueComplete={setChecking}
            accessibilityLabel="Verification code"
            style={{ gap: 16 }}
          >
            {[
              [0, 1, 2],
              [3, 4, 5],
            ].map((group) => (
              <InputOTPGroup key={group[0]} style={{ gap: 10 }}>
                {group.map((index) => (
                  <InputOTPSlot
                    key={index}
                    index={index}
                    style={(state) => [
                      styles.slot,
                      {
                        borderColor:
                          status === "error"
                            ? colors.danger
                            : state.active
                              ? colors.accent
                              : colors.separatorStrong,
                      },
                    ]}
                  />
                ))}
              </InputOTPGroup>
            ))}
          </InputOTP>
        </AnimatedView>
        <Text
          accessibilityLiveRegion="polite"
          style={[
            styles.hint,
            {
              color: status === "error" ? colors.danger : colors.labelSecondary,
            },
          ]}
        >
          {status === "error" ? "Incorrect code." : `Demo code: ${DEMO_CODE}`}
        </Text>
        <View style={styles.links}>
          {left > 0 ? (
            <Text
              style={[
                fontSize.sm,
                {
                  color: colors.labelSecondary,
                  fontVariant: ["tabular-nums"],
                },
              ]}
            >
              Resend code · 0:{String(left).padStart(2, "0")}
            </Text>
          ) : (
            <LinkText onPress={() => setLeft(30)}>Resend code ›</LinkText>
          )}
          <LinkText onPress={onHelp}>
            Didn't get a verification code? ›
          </LinkText>
        </View>
      </KeyboardScrollView>
    </Screen>
  )
}

export { VerifyCode }
```

4. Update the import paths to match your project.

**SwiftUI**

1. Target iOS 17 or later.

2. Add the Swift package to your app:

```swift title="Package.swift"
.package(url: "https://github.com/phosphor-icons/swift", from: "2.1.0")
```

3. Copy the theme files every view uses:

```swift title="swift/Theme/Theme.swift"
import SwiftUI
import UIKit

struct RGBA: Sendable {
  let red: CGFloat
  let green: CGFloat
  let blue: CGFloat
  let alpha: CGFloat

  init(_ hex: UInt32, _ alpha: CGFloat = 1) {
    red = CGFloat((hex >> 16) & 0xFF) / 255
    green = CGFloat((hex >> 8) & 0xFF) / 255
    blue = CGFloat(hex & 0xFF) / 255
    self.alpha = alpha
  }

  var uiColor: UIColor {
    UIColor(red: red, green: green, blue: blue, alpha: alpha)
  }
}

extension Color {
  static func adaptive(light: RGBA, dark: RGBA) -> Color {
    let lightColor = light.uiColor
    let darkColor = dark.uiColor
    return Color(uiColor: UIColor { traits in
      traits.userInterfaceStyle == .dark ? darkColor : lightColor
    })
  }
}

public struct TextStyle: Sendable, Hashable {
  public let size: CGFloat
  public let lineHeight: CGFloat
  public let letterSpacing: CGFloat

  public init(size: CGFloat, lineHeight: CGFloat, letterSpacing: CGFloat) {
    self.size = size
    self.lineHeight = lineHeight
    self.letterSpacing = letterSpacing
  }

  public func font(weight: Font.Weight = .regular) -> Font {
    .system(size: size, weight: weight)
  }

  public var lineSpacing: CGFloat {
    max(0, lineHeight - UIFont.systemFont(ofSize: size).lineHeight)
  }
}

extension Hashable where Self == Font {
  public static func textStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> Font {
    style.font(weight: weight)
  }
}

private struct TextStyleModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  func body(content: Content) -> some View {
    content
      .font(style.font(weight: weight))
      .tracking(style.letterSpacing)
      .lineSpacing(style.lineSpacing)
      .padding(.vertical, style.lineSpacing / 2)
  }
}

extension View {
  public func textStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(TextStyleModifier(style: style, weight: weight))
  }
}

public struct Shadow: Sendable, Hashable {
  public let color: Color
  public let radius: CGFloat
  public let x: CGFloat
  public let y: CGFloat

  public init(color: Color, radius: CGFloat, x: CGFloat = 0, y: CGFloat = 0) {
    self.color = color
    self.radius = radius
    self.x = x
    self.y = y
  }
}

extension View {
  public func shadow(_ shadow: Shadow) -> some View {
    self.shadow(color: shadow.color, radius: shadow.radius, x: shadow.x, y: shadow.y)
  }
}
```

```swift title="swift/Theme/Tokens.swift"
import SwiftUI

extension Color {
  public static let surface = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let surfaceSecondary = Color.adaptive(light: .init(0xF5F5F7), dark: .init(0x161617))
  public static let surfaceTertiary = Color.adaptive(light: .init(0xE8E8ED), dark: .init(0x2C2C2E))
  public static let surfaceRaised = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x1D1D1F))
  public static let label = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let labelSecondary = Color.adaptive(light: .init(0x6E6E73), dark: .init(0xA1A1A6))
  public static let labelTertiary = Color.adaptive(light: .init(0x86868B), dark: .init(0x86868B))
  public static let labelQuaternary = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let control = Color.adaptive(light: .init(0x000000, 0.04), dark: .init(0xFFFFFF, 0.1))
  public static let controlPressed = Color.adaptive(light: .init(0x000000, 0.12), dark: .init(0xFFFFFF, 0.22))
  public static let controlSelected = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let controlDisabled = Color.adaptive(light: .init(0x000000, 0.03), dark: .init(0xFFFFFF, 0.05))
  public static let onControlSelected = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let itemPressed = Color.adaptive(light: .init(0x000000, 0.08), dark: .init(0xFFFFFF, 0.12))
  public static let itemSelected = Color.adaptive(light: .init(0x000000, 0.06), dark: .init(0xFFFFFF, 0.1))
  public static let separator = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let separatorStrong = Color.adaptive(light: .init(0x86868B), dark: .init(0x6E6E73))
  public static let accent = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentPressed = Color.adaptive(light: .init(0x005BB8), dark: .init(0x004D9E))
  public static let accentSelected = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentDisabled = Color.adaptive(light: .init(0x0071E3, 0.4), dark: .init(0x0071E3, 0.4))
  public static let onAccent = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let accentSurface = Color.adaptive(light: .init(0x0071E3, 0.09), dark: .init(0x0071E3, 0.18))
  public static let accentSurfacePressed = Color.adaptive(light: .init(0x0071E3, 0.18), dark: .init(0x0071E3, 0.3))
  public static let link = Color.adaptive(light: .init(0x0066CC), dark: .init(0x2997FF))
  public static let focus = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let scrim = Color.adaptive(light: .init(0x000000, 0.48), dark: .init(0x000000, 0.48))
  public static let media = Color.adaptive(light: .init(0x000000), dark: .init(0x000000))
  public static let onMedia = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let danger = Color.adaptive(light: .init(0xD0000A), dark: .init(0xFF5447))
  public static let dangerSurface = Color.adaptive(light: .init(0xD70015, 0.08), dark: .init(0xFF453A, 0.2))
  public static let dangerSurfacePressed = Color.adaptive(light: .init(0xD70015, 0.16), dark: .init(0xFF453A, 0.36))
  public static let success = Color.adaptive(light: .init(0x008009), dark: .init(0x30D158))
  public static let successSurface = Color.adaptive(light: .init(0xEFFAF1), dark: .init(0x30D158, 0.16))
  public static let warning = Color.adaptive(light: .init(0xB64400), dark: .init(0xFF9F0A))
  public static let warningSurface = Color.adaptive(light: .init(0xFFF5EA), dark: .init(0xFF9F0A, 0.16))
}

public enum Radius {
  public static let xs: CGFloat = 3
  public static let sm: CGFloat = 5
  public static let md: CGFloat = 8
  public static let lg: CGFloat = 10
  public static let xl: CGFloat = 12
  public static let xl2: CGFloat = 18
  public static let xl3: CGFloat = 28
  public static let full: CGFloat = 9999
}

extension TextStyle {
  public static let xs3 = TextStyle(size: 11, lineHeight: 13, letterSpacing: 0.066)
  public static let xs2 = TextStyle(size: 12, lineHeight: 16, letterSpacing: 0)
  public static let xs = TextStyle(size: 13, lineHeight: 18, letterSpacing: -0.078)
  public static let sm = TextStyle(size: 15, lineHeight: 20, letterSpacing: -0.24)
  public static let md = TextStyle(size: 16, lineHeight: 21, letterSpacing: -0.32)
  public static let base = TextStyle(size: 17, lineHeight: 22, letterSpacing: -0.442)
  public static let lg = TextStyle(size: 20, lineHeight: 25, letterSpacing: -0.46)
  public static let xl = TextStyle(size: 22, lineHeight: 28, letterSpacing: -0.264)
  public static let xl2 = TextStyle(size: 28, lineHeight: 34, letterSpacing: 0.392)
  public static let xl3 = TextStyle(size: 34, lineHeight: 41, letterSpacing: 0.408)

  public static let allCases: [TextStyle] = [.xs3, .xs2, .xs, .sm, .md, .base, .lg, .xl, .xl2, .xl3]
}

extension Shadow {
  public static let md = Shadow(color: .black.opacity(0.08), radius: 6, x: 2, y: 4)
  public static let lg = Shadow(color: .black.opacity(0.12), radius: 12, y: 4)
}
```

4. Copy the source and every file it uses:

```swift title="swift/Blocks/VerifyCode.swift"
import PhosphorSwift
import SwiftUI

public struct VerifyCode: View {
  enum Status: Sendable {
    case idle, error, ok
  }

  static let demoCode = "482913"

  private var onHelp: (() -> Void)?
  private var onVerify: (String) async -> Bool = { $0 == "482913" }
  @State private var code: String
  @State private var status: Status
  @State private var left: Int
  @State private var shakes = 0
  @State private var focused = true
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    onVerify: @escaping (String) async -> Bool = { $0 == "482913" },
    onHelp: (() -> Void)? = nil
  ) {
    self.init(code: "", status: .idle, left: 30)
    self.onVerify = onVerify
    self.onHelp = onHelp
  }

  init(code: String, status: Status, left: Int) {
    _code = State(initialValue: code)
    _status = State(initialValue: status)
    _left = State(initialValue: left)
  }

  public var body: some View {
    Screen {
      if status == .ok {
        verified
          .transition(.opacity.combined(with: .offset(y: 18)))
      } else {
        form
      }
    }
    .animation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.6), value: status == .ok)
    .task(id: left) {
      guard left > 0 else { return }
      try? await Task.sleep(for: .seconds(1))
      guard !Task.isCancelled else { return }
      left -= 1
    }
  }

  private var form: some View {
    KeyboardScrollView {
      VStack(spacing: 0) {
        Ph.lockSimple.bold
          .frame(width: 30, height: 30)
          .foregroundStyle(Color.accent)
          .frame(width: 64, height: 64)
          .background(Color.surfaceSecondary, in: Circle())
          .accessibilityHidden(true)
        Text("Two-factor authentication")
          .scaledTextStyle(.xl2, weight: .bold)
          .padding(.top, 20)
        Text("Enter the 6-digit code sent to your trusted devices.")
          .scaledTextStyle(.lg)
          .foregroundStyle(Color.labelSecondary)
          .padding(.top, 12)
          .padding(.bottom, 30)
        InputOTP(text: $code, length: 6) {
          InputOTPGroup {
            ForEach(0..<3, id: \.self) { InputOTPSlot(index: $0) }
          }
          .padding(.trailing, 8)
          InputOTPGroup {
            ForEach(3..<6, id: \.self) { InputOTPSlot(index: $0) }
          }
        }
        .invalid(status == .error)
        .environment(\.inputOTPFocus, $focused)
        .shake(trigger: shakes)
        .hapticFeedback(.error, trigger: shakes)
        .onChange(of: code) { _, value in
          if status == .error && !value.isEmpty { status = .idle }
          if value.count == 6 { complete(value) }
        }
        .accessibilityLabel(Text("Verification code"))
        Text(status == .error ? "Incorrect code." : "Demo code: \(Self.demoCode)")
          .scaledFont(.sm)
          .foregroundStyle(status == .error ? Color.danger : .labelSecondary)
          .frame(minHeight: 20)
          .padding(.top, 14)
        VStack(spacing: 10) {
          if left > 0 {
            Text("Resend code · 0:\(String(format: "%02d", left))")
              .scaledFont(.sm)
              .monospacedDigit()
              .foregroundStyle(Color.labelSecondary)
              .frame(minHeight: 32)
          } else {
            Button("Resend code ›") { left = 30 }
              .buttonStyle(VerifyCodeLinkStyle())
          }
          Button("Didn't get a verification code? ›") { onHelp?() }
            .buttonStyle(VerifyCodeLinkStyle())
        }
        .padding(.top, 24)
      }
      .multilineTextAlignment(.center)
      .fixedSize(horizontal: false, vertical: true)
      .frame(maxWidth: .infinity)
      .padding(.horizontal, 24)
      .padding(.top, 72)
      .padding(.bottom, 24)
    }
  }

  private var verified: some View {
    VStack(spacing: 14) {
      Ph.check.bold
        .frame(width: 38, height: 38)
        .foregroundStyle(Color.onAccent)
        .frame(width: 76, height: 76)
        .background(Color.success, in: Circle())
        .accessibilityHidden(true)
      Text("Verified.")
        .scaledTextStyle(.xl2, weight: .bold)
      Text("This device is now trusted. You won't be asked for a code next time.")
        .scaledTextStyle(.lg)
        .foregroundStyle(Color.labelSecondary)
      Button("Start over ›") {
        code = ""
        status = .idle
      }
      .buttonStyle(VerifyCodeLinkStyle(style: .lg))
    }
    .multilineTextAlignment(.center)
    .fixedSize(horizontal: false, vertical: true)
    .padding(24)
    .frame(maxWidth: .infinity, maxHeight: .infinity)
  }

  private func complete(_ value: String) {
    Task {
      try? await Task.sleep(for: .milliseconds(200))
      if await onVerify(value) {
        focused = false
        status = .ok
        return
      }
      status = .error
      shakes += 1
      try? await Task.sleep(for: .milliseconds(800))
      code = ""
      status = .idle
    }
  }
}

private struct VerifyCodeLinkStyle: ButtonStyle {
  var style: TextStyle = .sm

  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .scaledFont(style)
      .foregroundStyle(Color.link)
      .opacity(configuration.isPressed ? 0.5 : 1)
      .frame(minHeight: 32)
      .contentShape(Rectangle())
  }
}
```

```swift title="swift/Components/Checkbox.swift"
import PhosphorSwift
import SwiftUI

extension Shadow {
  static let control = Shadow(color: .black.opacity(0.08), radius: 0.5, y: 0.5)
  static let thumb = Shadow(color: .black.opacity(0.12), radius: 1.5, y: 1)
}

struct SelectionIndicator<Mark: View>: View {
  let checked: Bool
  let pressed: Bool
  let cornerRadius: CGFloat
  let mark: Mark

  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

  init(checked: Bool, pressed: Bool, cornerRadius: CGFloat, @ViewBuilder mark: () -> Mark) {
    self.checked = checked
    self.pressed = pressed
    self.cornerRadius = cornerRadius
    self.mark = mark()
  }

  var body: some View {
    let shape = RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
    ZStack {
      shape.fill(fill)
      shape.strokeBorder(border, lineWidth: 1)
      if checked {
        mark
      }
    }
    .frame(width: 16, height: 16)
    .shadow(raised ? .control : Shadow(color: .clear, radius: 0))
  }

  private var isDark: Bool { colorScheme == .dark }

  private var raised: Bool { !checked && isEnabled && !isDark }

  private var fill: Color {
    if checked {
      return !isEnabled ? .accentDisabled : pressed ? .accentPressed : .accent
    }
    if !isEnabled { return .controlDisabled }
    if isDark { return pressed ? .labelTertiary.opacity(0.6) : .labelQuaternary }
    return pressed ? .control : .surface
  }

  private var border: Color {
    if checked {
      return !isEnabled ? .clear : pressed ? .accentPressed : .accent
    }
    if !isEnabled { return isDark ? .clear : .label.opacity(0.1) }
    if invalid { return .danger }
    return isDark ? .clear : .label.opacity(0.25)
  }
}

struct PressReader<Content: View>: ButtonStyle {
  let content: (Bool) -> Content

  init(@ViewBuilder content: @escaping (Bool) -> Content) {
    self.content = content
  }

  func makeBody(configuration: Configuration) -> some View {
    content(configuration.isPressed)
  }
}

public struct CheckboxStyle: ToggleStyle {
  public init() {}

  public func makeBody(configuration: Configuration) -> some View {
    HapticButton(style: PressReader { pressed in
      HStack(spacing: 12) {
        SelectionIndicator(
          checked: configuration.isOn || configuration.isMixed,
          pressed: pressed,
          cornerRadius: 4
        ) {
          (configuration.isMixed ? Ph.minus.regular : Ph.check.regular)
            .frame(width: 14, height: 14)
            .foregroundStyle(Color.onAccent)
        }
        configuration.label
      }
      .contentShape(Rectangle().inset(by: -8))
    }) {
      configuration.isOn.toggle()
      return true
    }
    .accessibilityElement(children: .combine)
    .accessibilityRemoveTraits(.isButton)
    .accessibilityAddTraits(.isToggle)
    .accessibilityValue(
      configuration.isMixed
        ? Text("Mixed")
        : configuration.isOn ? Text("Checked") : Text("Unchecked")
    )
  }
}

extension ToggleStyle where Self == CheckboxStyle {
  public static var checkbox: CheckboxStyle { CheckboxStyle() }
}
```

```swift title="swift/Components/Field.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry public var isInvalid = false
  @Entry var fieldInset = false
  @Entry var fieldGroupInset = false
  @Entry var fieldSetInset = false
}

extension View {
  public func invalid(_ isInvalid: Bool = true) -> some View {
    environment(\.isInvalid, isInvalid)
  }
}

public enum FieldOrientation: CaseIterable, Sendable {
  case vertical, horizontal
}

public struct Field<Content: View>: View {
  let orientation: FieldOrientation
  let invalid: Bool?
  let content: Content

  @Environment(\.fieldGroupInset) private var inset
  @Environment(\.isInvalid) private var inheritedInvalid

  public init(
    orientation: FieldOrientation = .vertical,
    invalid: Bool? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.orientation = orientation
    self.invalid = invalid
    self.content = content()
  }

  public var body: some View {
    Group {
      switch orientation {
      case .vertical:
        VStack(alignment: .leading, spacing: 12) { content }
      case .horizontal:
        HStack(alignment: .center, spacing: 12) { content }
      }
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .padding(.horizontal, inset ? 16 : 0)
    .padding(.vertical, inset ? 6 : 0)
    .frame(minHeight: inset ? 44 : nil)
    .overlay(alignment: .top) {
      if inset {
        Color.separator
          .frame(height: 1)
          .padding(.leading, 16)
          .offset(y: -1)
      }
    }
    .environment(\.fieldInset, inset)
    .environment(\.fieldGroupInset, false)
    .environment(\.isInvalid, invalid ?? inheritedInvalid)
  }
}

public struct FieldContent<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 4) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
  }
}

public struct FieldTitle: View {
  let text: Text

  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey) {
    text = Text(title)
  }

  public init<S: StringProtocol>(_ title: S) {
    text = Text(title)
  }

  public var body: some View {
    text
      .scaledTextStyle(.base, weight: .semibold)
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
  }
}

public struct FieldDescription: View {
  let text: Text

  @Environment(\.fieldSetInset) private var inset

  public init(_ description: LocalizedStringKey) {
    text = Text(description)
  }

  public init<S: StringProtocol>(_ description: S) {
    text = Text(description)
  }

  public var body: some View {
    text
      .scaledTextStyle(inset ? .xs : .sm)
      .foregroundStyle(Color.labelSecondary)
      .multilineTextAlignment(.leading)
      .fixedSize(horizontal: false, vertical: true)
      .padding(.leading, inset ? 16 : 0)
  }
}

public struct FieldError: View {
  let messages: [String]
  let text: Text?

  public init(_ message: LocalizedStringKey) {
    messages = []
    text = Text(message)
  }

  public init(errors: [String?]) {
    var seen = Set<String>()
    messages = errors.compactMap { $0 }.filter { !$0.isEmpty && seen.insert($0).inserted }
    text = nil
  }

  public var body: some View {
    if let content {
      content
        .scaledTextStyle(.sm)
        .foregroundStyle(Color.danger)
        .multilineTextAlignment(.leading)
        .fixedSize(horizontal: false, vertical: true)
    }
  }

  private var content: Text? {
    if let text { return text }
    switch messages.count {
    case 0: return nil
    case 1: return Text(verbatim: messages[0])
    default: return Text(verbatim: messages.map { "\u{2022} \($0)" }.joined(separator: "\n"))
    }
  }
}

public enum FieldGroupVariant: CaseIterable, Sendable {
  case `default`, inset
}

public struct FieldGroup<Content: View>: View {
  let variant: FieldGroupVariant
  let content: Content

  public init(_ variant: FieldGroupVariant = .default, @ViewBuilder content: () -> Content) {
    self.variant = variant
    self.content = content()
  }

  public var body: some View {
    styled
      .environment(\.fieldGroupInset, variant == .inset)
      .environment(\.fieldSetInset, false)
      .transformPreference(FieldSetInsetKey.self) { $0 = variant == .inset }
  }

  @ViewBuilder private var styled: some View {
    let stack = VStack(alignment: .leading, spacing: variant == .inset ? 0 : 28) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    if variant == .inset {
      let shape = RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous)
      stack
        .background(Color.surfaceSecondary, in: shape)
        .clipShape(shape)
    } else {
      stack
    }
  }
}

struct FieldSetInsetKey: PreferenceKey {
  static let defaultValue = false

  static func reduce(value: inout Bool, nextValue: () -> Bool) {
    value = value || nextValue()
  }
}

public struct FieldSet<Content: View>: View {
  let content: Content

  @State private var inset = false

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: inset ? 8 : 24) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .environment(\.fieldSetInset, inset)
    .onPreferenceChange(FieldSetInsetKey.self) { inset = $0 }
    .transformPreference(FieldSetInsetKey.self) { $0 = false }
    .accessibilityElement(children: .contain)
  }
}

public struct FieldLegend: View {
  public enum Variant: CaseIterable, Sendable {
    case legend, label
  }

  let text: Text
  let variant: Variant

  @Environment(\.fieldSetInset) private var inset
  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey, variant: Variant = .legend) {
    text = Text(title)
    self.variant = variant
  }

  public init<S: StringProtocol>(_ title: S, variant: Variant = .legend) {
    text = Text(title)
    self.variant = variant
  }

  public var body: some View {
    Group {
      if inset {
        text
          .textCase(.uppercase)
          .scaledTextStyle(.xs)
          .foregroundStyle(isEnabled ? Color.labelSecondary : .labelQuaternary)
          .padding(.leading, 16)
      } else {
        text
          .scaledTextStyle(.base, weight: .semibold)
          .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
          .padding(.bottom, 12)
      }
    }
    .accessibilityAddTraits(variant == .legend ? .isHeader : [])
  }
}

public struct FieldSeparator<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    ZStack {
      Separator()
      content
        .scaledTextStyle(.sm)
        .foregroundStyle(Color.labelSecondary)
        .padding(.horizontal, 8)
        .background(Color.surface)
    }
    .frame(minHeight: 20)
    .padding(.vertical, -8)
  }
}

extension FieldSeparator where Content == EmptyView {
  public init() {
    self.init { EmptyView() }
  }
}

extension FieldSeparator where Content == Text {
  public init(_ title: LocalizedStringKey) {
    self.init { Text(title) }
  }
}
```

```swift title="swift/Components/Haptics.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry public var hapticsEnabled = true
}

extension View {
  public func haptics(_ enabled: Bool) -> some View {
    environment(\.hapticsEnabled, enabled)
  }

  func hapticFeedback<Trigger: Equatable>(_ feedback: SensoryFeedback, trigger: Trigger) -> some View {
    modifier(HapticFeedbackModifier(feedback: feedback, trigger: trigger) { _, _ in true })
  }

  func hapticFeedback<Trigger: Equatable>(
    _ feedback: SensoryFeedback,
    trigger: Trigger,
    condition: @escaping (Trigger, Trigger) -> Bool
  ) -> some View {
    modifier(HapticFeedbackModifier(feedback: feedback, trigger: trigger, condition: condition))
  }
}

private struct HapticFeedbackModifier<Trigger: Equatable>: ViewModifier {
  let feedback: SensoryFeedback
  let trigger: Trigger
  let condition: (Trigger, Trigger) -> Bool

  @Environment(\.hapticsEnabled) private var enabled

  func body(content: Content) -> some View {
    let enabled = enabled
    let condition = condition
    content.sensoryFeedback(feedback, trigger: trigger) { old, new in
      enabled && condition(old, new)
    }
  }
}

enum HapticMoments {
  static func step(_ value: Double, bounds: ClosedRange<Double>, step: Double?) -> Int? {
    guard let step, step > 0 else { return nil }
    return Int(((value - bounds.lowerBound) / step).rounded())
  }

  static func lifted<Value: Equatable>(_ old: Value?, _ new: Value?) -> Bool {
    new != nil && old != new
  }

  static func crossed<Value: Equatable>(_ old: Value?, _ new: Value?) -> Bool {
    old == nil && new != nil
  }

  static func moved(_ old: Int?, _ new: Int?) -> Bool {
    guard let old, let new else { return false }
    return old != new
  }
}

struct HapticButton<Style: ButtonStyle>: View {
  let feedback: SensoryFeedback
  let action: () -> Bool
  let style: Style

  @State private var count = 0

  init(_ feedback: SensoryFeedback = .selection, style: Style, action: @escaping () -> Bool) {
    self.feedback = feedback
    self.style = style
    self.action = action
  }

  var body: some View {
    Button {
      if action() { count += 1 }
    } label: {
      EmptyView()
    }
    .buttonStyle(style)
    .hapticFeedback(feedback, trigger: count)
  }
}
```

```swift title="swift/Components/InputOTP.swift"
import PhosphorSwift
import SwiftUI

struct InputOTPContext {
  var characters: [Character]
  var length: Int
  var focused: Bool
}

struct InputOTPTone: Equatable {
  var danger = false
  var verified = false
  var dimmed = false
  var pops: [Int] = []
}

extension EnvironmentValues {
  @Entry var inputOTP = InputOTPContext(characters: [], length: 0, focused: false)
  @Entry var inputOTPTone = InputOTPTone()
  @Entry var inputOTPFocus: Binding<Bool>?
}

public struct InputOTP<Content: View>: View {
  @Binding var text: String
  let length: Int
  let allowed: CharacterSet
  let content: Content

  @FocusState private var focused: Bool
  @Environment(\.inputOTPFocus) private var externalFocus

  public init(
    text: Binding<String>,
    length: Int,
    allowed: CharacterSet = .decimalDigits,
    @ViewBuilder content: () -> Content
  ) {
    _text = text
    self.length = length
    self.allowed = allowed
    self.content = content()
  }

  public var body: some View {
    HStack(spacing: 8) {
      content
    }
    .accessibilityHidden(true)
    .environment(\.inputOTP, InputOTPContext(characters: Array(text), length: length, focused: focused))
    .background {
      TextField("", text: filtered)
        .textContentType(.oneTimeCode)
        .keyboardType(allowed == .decimalDigits ? .numberPad : .asciiCapable)
        .textInputAutocapitalization(.never)
        .autocorrectionDisabled()
        .focused($focused)
        .foregroundStyle(.clear)
        .tint(.clear)
        .accessibilityLabel(Text("One-time code"))
        .accessibilityValue(Text(verbatim: text))
    }
    .contentShape(Rectangle())
    .onTapGesture { focused = true }
    .onAppear {
      if externalFocus?.wrappedValue == true { focused = true }
    }
    .onChange(of: focused) { _, new in
      if let externalFocus, externalFocus.wrappedValue != new { externalFocus.wrappedValue = new }
    }
    .onChange(of: externalFocus?.wrappedValue) { _, new in
      if let new, new != focused { focused = new }
    }
  }

  private var filtered: Binding<String> {
    Binding(
      get: { text },
      set: { newValue in
        let scalars = newValue.unicodeScalars.filter { allowed.contains($0) }
        text = String(String.UnicodeScalarView(scalars).prefix(length))
      }
    )
  }
}

extension InputOTP where Content == InputOTPGroup<ForEach<Range<Int>, Int, InputOTPSlot>> {
  public init(text: Binding<String>, length: Int, allowed: CharacterSet = .decimalDigits) {
    self.init(text: text, length: length, allowed: allowed) {
      InputOTPGroup {
        ForEach(0..<length, id: \.self) { InputOTPSlot(index: $0) }
      }
    }
  }
}

public struct InputOTPGroup<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    HStack(spacing: 8) {
      content
    }
  }
}

public struct InputOTPSlot: View {
  let index: Int

  @Environment(\.inputOTP) private var context
  @Environment(\.inputOTPTone) private var tone
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme
  @Environment(\.accessibilityReduceMotion) private var reduceMotion
  @ScaledMetric(relativeTo: .title2) private var scale: CGFloat = 1

  public init(index: Int) {
    self.index = index
  }

  public var body: some View {
    let shape = RoundedRectangle(cornerRadius: Radius.lg, style: .continuous)
    let character = index < context.characters.count ? context.characters[index] : nil
    let active = isEnabled && context.focused
      && index == min(context.characters.count, context.length - 1)
    let pop = index < tone.pops.count ? tone.pops[index] : 0
    let still = reduceMotion
    ZStack {
      if let character {
        Text(String(character))
          .font(.system(size: TextStyle.xl.size * scale, weight: .semibold))
          .monospacedDigit()
          .foregroundStyle(foreground)
      } else if active {
        InputOTPCaret()
      }
    }
    .frame(width: 44 * scale, height: 52 * scale)
    .background(background, in: shape)
    .overlay {
      shape.strokeBorder(border(active: active), lineWidth: 1.5)
    }
    .opacity(tone.dimmed ? 0.6 : 1)
    .animation(.easeInOut(duration: 0.3), value: tone)
    .animation(.easeInOut(duration: 0.3), value: invalid)
    .keyframeAnimator(initialValue: CGFloat(1), trigger: pop) { view, value in
      view.scaleEffect(still ? 1 : value)
    } keyframes: { _ in
      KeyframeTrack {
        LinearKeyframe(0.8, duration: 0.001)
        CubicKeyframe(1.08, duration: 0.144)
        CubicKeyframe(1, duration: 0.096)
      }
    }
    .zIndex(active ? 1 : 0)
  }

  private var foreground: Color {
    if !isEnabled { return .labelQuaternary }
    if tone.verified { return .success }
    if tone.danger { return .danger }
    return .label
  }

  private var background: Color {
    if !isEnabled { return .controlDisabled }
    if tone.verified { return .successSurface }
    if invalid { return .danger.opacity(colorScheme == .dark ? 0.1 : 0.05) }
    return .control
  }

  private func border(active: Bool) -> Color {
    if !isEnabled { return .clear }
    if tone.verified { return .success }
    if invalid { return .danger }
    return active ? .accent : .clear
  }
}

private struct InputOTPCaret: View {
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  var body: some View {
    TimelineView(.periodic(from: .now, by: 0.5)) { timeline in
      let phase = Int(timeline.date.timeIntervalSinceReferenceDate * 2) % 2
      Capsule()
        .fill(Color.accent)
        .frame(width: 2, height: 24)
        .opacity(reduceMotion || phase == 0 ? 1 : 0)
        .animation(reduceMotion ? nil : .easeInOut(duration: 0.2), value: phase)
    }
  }
}

public struct InputOTPSeparator: View {
  @Environment(\.isEnabled) private var isEnabled

  public init() {}

  public var body: some View {
    Ph.minus.regular
      .frame(width: 16, height: 16)
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
  }
}
```

```swift title="swift/Components/KeyboardScrollView.swift"
import SwiftUI
import UIKit

public struct KeyboardScrollView<Content: View>: View {
  let showsIndicators: Bool
  let content: Content

  public init(showsIndicators: Bool = true, @ViewBuilder content: () -> Content) {
    self.showsIndicators = showsIndicators
    self.content = content()
  }

  public var body: some View {
    ScrollView(.vertical, showsIndicators: showsIndicators) {
      content
        .frame(maxWidth: .infinity, alignment: .topLeading)
        .background {
          Color.clear
            .contentShape(Rectangle())
            .onTapGesture { KeyboardScrollView.dismissKeyboard() }
        }
    }
    .scrollDismissesKeyboard(.interactively)
  }

  @MainActor
  static func dismissKeyboard() {
    UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
  }
}
```

```swift title="swift/Components/Keypad.swift"
import PhosphorSwift
import SwiftUI

public enum KeypadKey: Hashable, Sendable {
  case digit(Int)
  case decimal
  case delete
  case biometric
}

public enum KeypadAccessory {
  case none
  case decimal(String, label: LocalizedStringKey = "Decimal separator")
  case biometric(Image, label: LocalizedStringKey = "Use biometrics")
}

public struct Keypad: View {
  let accessory: KeypadAccessory
  let deleteLabel: LocalizedStringKey
  let canDelete: Bool
  let press: (KeypadKey) -> Bool

  public init(
    accessory: KeypadAccessory = .none,
    deleteLabel: LocalizedStringKey = "Delete",
    deleteDisabled: Bool = false,
    onKeyPress: @escaping (KeypadKey) -> Void
  ) {
    self.accessory = accessory
    self.deleteLabel = deleteLabel
    canDelete = !deleteDisabled
    press = { key in
      onKeyPress(key)
      return true
    }
  }

  init(
    accessory: KeypadAccessory,
    deleteLabel: LocalizedStringKey,
    canDelete: Bool,
    press: @escaping (KeypadKey) -> Bool
  ) {
    self.accessory = accessory
    self.deleteLabel = deleteLabel
    self.canDelete = canDelete
    self.press = press
  }

  @ScaledMetric(relativeTo: .title) private var scale: CGFloat = 1

  public var body: some View {
    let size = min(max(72 * scale, 64), 80)
    VStack(spacing: 16) {
      ForEach(0..<3) { row in
        HStack(spacing: 24) {
          ForEach(1..<4) { column in
            digit(row * 3 + column, size: size)
          }
        }
      }
      HStack(spacing: 24) {
        accessoryKey(size: size)
        digit(0, size: size)
        key(.delete, size: size, filled: false) {
          Ph.backspace.regular
            .resizable()
            .frame(width: 28, height: 28)
        }
        .disabled(!canDelete)
        .accessibilityLabel(Text(deleteLabel))
      }
    }
    .accessibilityElement(children: .contain)
  }

  private func digit(_ value: Int, size: CGFloat) -> some View {
    key(.digit(value), size: size, filled: true) {
      Text(verbatim: "\(value)")
        .scaledFont(.xl2)
        .monospacedDigit()
    }
    .accessibilityLabel(Text(verbatim: "\(value)"))
  }

  @ViewBuilder
  private func accessoryKey(size: CGFloat) -> some View {
    switch accessory {
    case .none:
      Color.clear.frame(width: size, height: size)
        .accessibilityHidden(true)
    case .decimal(let separator, let label):
      key(.decimal, size: size, filled: false) {
        Text(verbatim: separator)
          .scaledFont(.xl2)
      }
      .accessibilityLabel(Text(label))
    case .biometric(let icon, let label):
      key(.biometric, size: size, filled: false) {
        icon
          .resizable()
          .frame(width: 28, height: 28)
      }
      .accessibilityLabel(Text(label))
    }
  }

  private func key<Label: View>(
    _ key: KeypadKey,
    size: CGFloat,
    filled: Bool,
    @ViewBuilder label: @escaping () -> Label
  ) -> some View {
    HapticButton(style: PressReader { pressed in
      KeypadFace(pressed: pressed, filled: filled, size: size, label: label)
    }) {
      press(key)
    }
  }
}

private struct KeypadFace<Label: View>: View {
  let pressed: Bool
  let filled: Bool
  let size: CGFloat
  let label: () -> Label

  @Environment(\.isEnabled) private var isEnabled

  var body: some View {
    label()
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
      .frame(width: size, height: size)
      .background(fill, in: Circle())
      .contentShape(Circle())
      .animation(.easeOut(duration: 0.12), value: pressed)
  }

  private var fill: Color {
    if pressed { return .controlPressed }
    if !filled { return .clear }
    return isEnabled ? .control : .controlDisabled
  }
}

private struct ShakeModifier: ViewModifier {
  let trigger: Int

  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  func body(content: Content) -> some View {
    let still = reduceMotion
    content.keyframeAnimator(initialValue: CGFloat(0), trigger: trigger) { view, offset in
      view.offset(x: still ? 0 : offset)
    } keyframes: { _ in
      KeyframeTrack {
        LinearKeyframe(-8, duration: 0.08)
        LinearKeyframe(7, duration: 0.08)
        LinearKeyframe(-5, duration: 0.08)
        LinearKeyframe(3, duration: 0.08)
        LinearKeyframe(0, duration: 0.08, timingCurve: .easeOut)
      }
    }
  }
}

extension View {
  func shake(trigger: Int) -> some View {
    modifier(ShakeModifier(trigger: trigger))
  }
}
```

```swift title="swift/Components/Screen.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry var screenBackground: Color = .surface
}

public struct Screen<Content: View>: View {
  public enum Background: CaseIterable, Sendable {
    case surface, surfaceSecondary

    var color: Color {
      switch self {
      case .surface: .surface
      case .surfaceSecondary: .surfaceSecondary
      }
    }
  }

  let edges: Edge.Set
  let background: Background
  let content: Content

  public init(
    edges: Edge.Set = .all,
    background: Background = .surface,
    @ViewBuilder content: () -> Content
  ) {
    self.edges = edges
    self.background = background
    self.content = content()
  }

  public var body: some View {
    VStack(spacing: 0) {
      content
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
    .ignoresSafeArea(.container, edges: Edge.Set.all.subtracting(edges))
    .foregroundStyle(Color.label)
    .background(background.color.ignoresSafeArea())
    .environment(\.screenBackground, background.color)
  }
}

public struct ScreenContent<Content: View>: View {
  let scroll: Bool
  let padded: Bool
  let content: Content

  public init(scroll: Bool = true, padded: Bool = true, @ViewBuilder content: () -> Content) {
    self.scroll = scroll
    self.padded = padded
    self.content = content()
  }

  public var body: some View {
    if scroll {
      KeyboardScrollView {
        stack
      }
    } else {
      stack
        .frame(maxHeight: .infinity, alignment: .top)
    }
  }

  private var stack: some View {
    VStack(alignment: .leading, spacing: 16) {
      content
    }
    .padding(padded ? 16 : 0)
    .frame(maxWidth: .infinity, alignment: .leading)
  }
}
```

```swift title="swift/Components/Separator.swift"
import SwiftUI

public struct Separator: View {
  let orientation: Axis

  public init(_ orientation: Axis = .horizontal) {
    self.orientation = orientation
  }

  public var body: some View {
    Rectangle()
      .fill(Color.separator)
      .frame(width: orientation == .vertical ? 1 : nil, height: orientation == .horizontal ? 1 : nil)
      .frame(maxWidth: orientation == .horizontal ? .infinity : nil, maxHeight: orientation == .vertical ? .infinity : nil)
      .accessibilityHidden(true)
  }
}
```

```swift title="swift/Components/TextVariant.swift"
import SwiftUI

public enum TextVariant: CaseIterable, Sendable {
  case `default`, h1, h2, h3, h4, p, blockquote, code, lead, large, small, muted

  var style: TextStyle {
    switch self {
    case .h1: .xl3
    case .h2: .xl2
    case .h3: .xl
    case .h4, .lead, .large: .lg
    case .code, .small, .muted: .sm
    default: .base
    }
  }

  var weight: Font.Weight {
    switch self {
    case .h1, .h2: .bold
    case .h3, .h4, .large, .code: .semibold
    case .small: .medium
    default: .regular
    }
  }

  var color: Color {
    switch self {
    case .lead, .muted: .labelSecondary
    default: .label
    }
  }

  var isHeading: Bool {
    switch self {
    case .h1, .h2, .h3, .h4: true
    default: false
    }
  }
}

private struct TextVariantModifier: ViewModifier {
  let variant: TextVariant

  func body(content: Content) -> some View {
    switch variant {
    case .blockquote:
      styled(content)
        .italic()
        .padding(.leading, 12)
        .overlay(alignment: .leading) {
          Rectangle().fill(Color.separator).frame(width: 2)
        }
        .padding(.top, 16)
    case .code:
      styled(content)
        .monospaced()
        .padding(.horizontal, 4)
        .padding(.vertical, 2)
        .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.sm, style: .continuous))
    case .p:
      styled(content).padding(.top, 12)
    default:
      styled(content)
    }
  }

  private func styled(_ content: Content) -> some View {
    content
      .scaledTextStyle(variant.style, weight: variant.weight)
      .foregroundStyle(variant.color)
      .accessibilityAddTraits(variant.isHeading ? .isHeader : [])
  }
}

extension View {
  public func textVariant(_ variant: TextVariant) -> some View {
    modifier(TextVariantModifier(variant: variant))
  }
}

private struct ScaledTextStyleModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  @ScaledMetric(relativeTo: .body) private var scale: CGFloat = 1

  func body(content: Content) -> some View {
    let size = style.size * scale
    let lineSpacing = max(0, style.lineHeight * scale - UIFont.systemFont(ofSize: size).lineHeight)
    content
      .font(.system(size: size, weight: weight))
      .tracking(style.letterSpacing)
      .lineSpacing(lineSpacing)
      .padding(.vertical, lineSpacing / 2)
  }
}

extension View {
  func scaledTextStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(ScaledTextStyleModifier(style: style, weight: weight))
  }

  func scaledFont(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(ScaledFontModifier(style: style, weight: weight))
  }
}

private struct ScaledFontModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  @ScaledMetric(relativeTo: .body) private var scale: CGFloat = 1

  func body(content: Content) -> some View {
    content
      .font(.system(size: style.size * scale, weight: weight))
      .tracking(style.letterSpacing)
  }
}
```

5. Add the files to your app target.

**Jetpack Compose**

1. Set `minSdk` to 24 or higher and add the dependencies:

```kotlin title="build.gradle.kts"
implementation(platform("androidx.compose:compose-bom:2026.09.00"))
implementation("androidx.compose.foundation:foundation")
implementation("androidx.compose.ui:ui")
implementation("com.adamglin:phosphor-icon-android:1.0.0")
```

2. Copy the theme files every view uses:

```kt title="kotlin/theme/Theme.kt"
package com.esuiss.ui.theme

import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.dropShadow
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.shadow.Shadow as DropShadow
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.LineHeightStyle
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.DpOffset
import androidx.compose.ui.unit.em
import androidx.compose.ui.unit.sp

internal fun textStyle(size: Double, lineHeight: Double, letterSpacing: Double) = TextStyle(
    fontSize = size.sp,
    lineHeight = lineHeight.sp,
    letterSpacing = letterSpacing.em,
    lineHeightStyle = LineHeightStyle(
        alignment = LineHeightStyle.Alignment.Center,
        trim = LineHeightStyle.Trim.None,
    ),
)

@Immutable
data class Shadow(
    val offsetX: Dp,
    val offsetY: Dp,
    val blur: Dp,
    val color: Color,
)

fun Modifier.shadow(shadow: Shadow, shape: Shape): Modifier = dropShadow(
    shape,
    DropShadow(
        radius = shadow.blur,
        color = shadow.color,
        offset = DpOffset(shadow.offsetX, shadow.offsetY),
    ),
)

val LocalColors = staticCompositionLocalOf { LightColors }

object EsuissTheme {
    val colors: Colors
        @Composable get() = LocalColors.current

    val typography: Typography
        get() = Typography

    val radius: Radius
        get() = Radius

    val shadows: Shadows
        get() = Shadows
}

@Composable
fun EsuissTheme(
    darkTheme: Boolean = isSystemInDarkTheme(),
    content: @Composable () -> Unit,
) {
    CompositionLocalProvider(
        LocalColors provides if (darkTheme) DarkColors else LightColors,
        content = content,
    )
}
```

```kt title="kotlin/theme/Tokens.kt"
package com.esuiss.ui.theme

import androidx.compose.runtime.Immutable
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp

@Immutable
data class Colors(
    val surface: Color,
    val surfaceSecondary: Color,
    val surfaceTertiary: Color,
    val surfaceRaised: Color,
    val label: Color,
    val labelSecondary: Color,
    val labelTertiary: Color,
    val labelQuaternary: Color,
    val control: Color,
    val controlPressed: Color,
    val controlSelected: Color,
    val controlDisabled: Color,
    val onControlSelected: Color,
    val itemPressed: Color,
    val itemSelected: Color,
    val separator: Color,
    val separatorStrong: Color,
    val accent: Color,
    val accentPressed: Color,
    val accentSelected: Color,
    val accentDisabled: Color,
    val onAccent: Color,
    val accentSurface: Color,
    val accentSurfacePressed: Color,
    val link: Color,
    val focus: Color,
    val scrim: Color,
    val media: Color,
    val onMedia: Color,
    val danger: Color,
    val dangerSurface: Color,
    val dangerSurfacePressed: Color,
    val success: Color,
    val successSurface: Color,
    val warning: Color,
    val warningSurface: Color,
    val blue: Color,
    val green: Color,
    val orange: Color,
    val red: Color,
    val yellow: Color,
    val purple: Color,
    val pink: Color,
    val indigo: Color,
    val teal: Color,
    val mint: Color,
    val cyan: Color,
    val brown: Color,
    val gray: Color,
    val isDark: Boolean,
)

val LightColors = Colors(
    surface = Color(0xFFFFFFFF),
    surfaceSecondary = Color(0xFFF5F5F7),
    surfaceTertiary = Color(0xFFE8E8ED),
    surfaceRaised = Color(0xFFFFFFFF),
    label = Color(0xFF1D1D1F),
    labelSecondary = Color(0xFF6E6E73),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFFD2D2D7),
    control = Color(0xFF000000).copy(alpha = 0.04f),
    controlPressed = Color(0xFF000000).copy(alpha = 0.12f),
    controlSelected = Color(0xFF1D1D1F),
    controlDisabled = Color(0xFF000000).copy(alpha = 0.03f),
    onControlSelected = Color(0xFFFFFFFF),
    itemPressed = Color(0xFF000000).copy(alpha = 0.08f),
    itemSelected = Color(0xFF000000).copy(alpha = 0.06f),
    separator = Color(0xFFD2D2D7),
    separatorStrong = Color(0xFF86868B),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF005BB8),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.09f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.18f),
    link = Color(0xFF0066CC),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFD0000A),
    dangerSurface = Color(0xFFD70015).copy(alpha = 0.08f),
    dangerSurfacePressed = Color(0xFFD70015).copy(alpha = 0.16f),
    success = Color(0xFF008009),
    successSurface = Color(0xFFEFFAF1),
    warning = Color(0xFFB64400),
    warningSurface = Color(0xFFFFF5EA),
    blue = Color(0xFF007AFF),
    green = Color(0xFF34C759),
    orange = Color(0xFFFF9500),
    red = Color(0xFFFF3B30),
    yellow = Color(0xFFFFCC00),
    purple = Color(0xFFAF52DE),
    pink = Color(0xFFFF2D55),
    indigo = Color(0xFF5856D6),
    teal = Color(0xFF30B0C7),
    mint = Color(0xFF00C7BE),
    cyan = Color(0xFF32ADE6),
    brown = Color(0xFFA2845E),
    gray = Color(0xFF8E8E93),
    isDark = false,
)

val DarkColors = Colors(
    surface = Color(0xFF000000),
    surfaceSecondary = Color(0xFF161617),
    surfaceTertiary = Color(0xFF2C2C2E),
    surfaceRaised = Color(0xFF1D1D1F),
    label = Color(0xFFF5F5F7),
    labelSecondary = Color(0xFFA1A1A6),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFF424245),
    control = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    controlPressed = Color(0xFFFFFFFF).copy(alpha = 0.22f),
    controlSelected = Color(0xFFF5F5F7),
    controlDisabled = Color(0xFFFFFFFF).copy(alpha = 0.05f),
    onControlSelected = Color(0xFF000000),
    itemPressed = Color(0xFFFFFFFF).copy(alpha = 0.12f),
    itemSelected = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    separator = Color(0xFF424245),
    separatorStrong = Color(0xFF6E6E73),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF004D9E),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.18f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.3f),
    link = Color(0xFF2997FF),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFFF5447),
    dangerSurface = Color(0xFFFF453A).copy(alpha = 0.2f),
    dangerSurfacePressed = Color(0xFFFF453A).copy(alpha = 0.36f),
    success = Color(0xFF30D158),
    successSurface = Color(0xFF30D158).copy(alpha = 0.16f),
    warning = Color(0xFFFF9F0A),
    warningSurface = Color(0xFFFF9F0A).copy(alpha = 0.16f),
    blue = Color(0xFF0A84FF),
    green = Color(0xFF30D158),
    orange = Color(0xFFFF9F0A),
    red = Color(0xFFFF453A),
    yellow = Color(0xFFFFD60A),
    purple = Color(0xFFBF5AF2),
    pink = Color(0xFFFF375F),
    indigo = Color(0xFF5E5CE6),
    teal = Color(0xFF40C8E0),
    mint = Color(0xFF66D4CF),
    cyan = Color(0xFF64D2FF),
    brown = Color(0xFFAC8E68),
    gray = Color(0xFF8E8E93),
    isDark = true,
)

object Radius {
    val xs = 3.dp
    val sm = 5.dp
    val md = 8.dp
    val lg = 10.dp
    val xl = 12.dp
    val xl2 = 18.dp
    val xl3 = 28.dp
    val full = 9999.dp
}

object Typography {
    val xs3 = textStyle(11.0, 13.0, 0.006)
    val xs2 = textStyle(12.0, 16.0, 0.0)
    val xs = textStyle(13.0, 18.0, -0.006)
    val sm = textStyle(15.0, 20.0, -0.016)
    val md = textStyle(16.0, 21.0, -0.02)
    val base = textStyle(17.0, 22.0, -0.026)
    val lg = textStyle(20.0, 25.0, -0.023)
    val xl = textStyle(22.0, 28.0, -0.012)
    val xl2 = textStyle(28.0, 34.0, 0.014)
    val xl3 = textStyle(34.0, 41.0, 0.012)

    val all = listOf(xs3, xs2, xs, sm, md, base, lg, xl, xl2, xl3)
}

object Shadows {
    val md = Shadow(2.dp, 4.dp, 12.dp, Color.Black.copy(alpha = 0.08f))
    val lg = Shadow(0.dp, 4.dp, 24.dp, Color.Black.copy(alpha = 0.12f))
}
```

3. Copy the source and every file it uses:

```kt title="kotlin/blocks/VerifyCode.kt"
package com.esuiss.ui.blocks

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Bold
import com.adamglin.phosphoricons.bold.Check
import com.adamglin.phosphoricons.bold.LockSimple
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.InputOTPGroup
import com.esuiss.ui.components.InputOTPSlot
import com.esuiss.ui.components.KeyboardScrollView
import com.esuiss.ui.components.Screen
import com.esuiss.ui.interactions.OtpAutofill
import com.esuiss.ui.interactions.OtpAutofillInput
import com.esuiss.ui.interactions.OtpAutofillState
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography
import kotlinx.coroutines.delay

private const val DemoCode = "482913"

private val RevealEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

@Composable
fun VerifyCode(
    modifier: Modifier = Modifier,
    onVerify: suspend (code: String) -> Boolean = { it == DemoCode },
    onHelp: () -> Unit = {},
) {
    val colors = EsuissTheme.colors
    val verify by rememberUpdatedState(onVerify)
    var verified by rememberSaveable { mutableStateOf(false) }
    var attempt by remember { mutableIntStateOf(0) }
    var left by rememberSaveable { mutableIntStateOf(30) }

    LaunchedEffect(left) {
        if (left <= 0) return@LaunchedEffect
        delay(1000)
        left -= 1
    }

    Screen(modifier) {
        if (verified) {
            Success {
                verified = false
                attempt += 1
            }
            return@Screen
        }
        BoxWithConstraints(Modifier.fillMaxSize()) {
            val height = maxHeight
            KeyboardScrollView(Modifier.fillMaxSize()) {
                Column(
                    modifier = Modifier
                        .fillMaxWidth()
                        .heightIn(min = height)
                        .padding(24.dp),
                    verticalArrangement = Arrangement.Center,
                    horizontalAlignment = Alignment.CenterHorizontally,
                ) {
                    Box(
                        Modifier
                            .size(64.dp)
                            .background(colors.surfaceSecondary, CircleShape),
                        contentAlignment = Alignment.Center,
                    ) {
                        Icon(PhosphorIcons.Bold.LockSimple, contentDescription = null, size = 30.dp, tint = colors.accent)
                    }
                    Spacer(Modifier.height(20.dp))
                    BasicText(
                        "Two-factor authentication",
                        modifier = Modifier.semantics { heading() },
                        style = Typography.xl3.copy(color = colors.label, fontWeight = FontWeight.SemiBold, textAlign = TextAlign.Center),
                    )
                    Spacer(Modifier.height(12.dp))
                    BasicText(
                        "Enter the 6-digit code sent to your trusted devices.",
                        style = Typography.lg.copy(color = colors.labelSecondary, textAlign = TextAlign.Center),
                    )
                    Spacer(Modifier.height(30.dp))
                    key(attempt) {
                        OtpAutofill(
                            maxLength = 6,
                            onVerify = { code ->
                                val ok = verify(code)
                                if (ok) {
                                    delay(500)
                                    verified = true
                                }
                                ok
                            },
                        ) {
                            OtpAutofillInput(contentDescription = "Verification code") {
                                InputOTPGroup(Modifier.padding(end = 8.dp)) {
                                    repeat(3) { InputOTPSlot(it) }
                                }
                                InputOTPGroup {
                                    repeat(3) { InputOTPSlot(it + 3) }
                                }
                            }
                            val invalid = state == OtpAutofillState.Invalid
                            BasicText(
                                if (invalid) "Incorrect code." else "Demo code: $DemoCode",
                                modifier = Modifier
                                    .heightIn(min = 20.dp)
                                    .semantics { liveRegion = LiveRegionMode.Polite },
                                style = Typography.sm.copy(
                                    color = if (invalid) colors.danger else colors.labelSecondary,
                                    textAlign = TextAlign.Center,
                                ),
                            )
                        }
                    }
                    Spacer(Modifier.height(24.dp))
                    Column(
                        horizontalAlignment = Alignment.CenterHorizontally,
                        verticalArrangement = Arrangement.spacedBy(10.dp),
                    ) {
                        if (left > 0) {
                            BasicText(
                                "Resend code · 0:${left.toString().padStart(2, '0')}",
                                style = Typography.sm.copy(color = colors.labelSecondary, fontFeatureSettings = "tnum"),
                            )
                        } else {
                            LinkText("Resend code ›") {
                                left = 30
                            }
                        }
                        LinkText("Didn't get a verification code? ›", onHelp)
                    }
                }
            }
        }
    }
}

@Composable
private fun LinkText(text: String, onClick: () -> Unit) {
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    BasicText(
        text,
        modifier = Modifier
            .graphicsLayer { alpha = if (pressed) 0.5f else 1f }
            .clickable(interactionSource = interaction, indication = null, role = Role.Button, onClick = onClick)
            .padding(vertical = 4.dp),
        style = Typography.sm.copy(color = EsuissTheme.colors.link, textAlign = TextAlign.Center),
    )
}

@Composable
private fun Success(onStartOver: () -> Unit) {
    val colors = EsuissTheme.colors
    val appear = remember { Animatable(0f) }
    LaunchedEffect(Unit) { appear.animateTo(1f, tween(1000, easing = RevealEasing)) }
    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(24.dp)
            .graphicsLayer {
                alpha = appear.value
                translationY = (1f - appear.value) * 18.dp.toPx()
            },
        verticalArrangement = Arrangement.spacedBy(14.dp, Alignment.CenterVertically),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        Box(
            Modifier
                .size(76.dp)
                .background(colors.success, CircleShape),
            contentAlignment = Alignment.Center,
        ) {
            Icon(PhosphorIcons.Bold.Check, contentDescription = null, size = 38.dp, tint = colors.onAccent)
        }
        BasicText(
            "Verified.",
            modifier = Modifier.semantics { heading() },
            style = Typography.xl3.copy(color = colors.label, fontWeight = FontWeight.SemiBold),
        )
        BasicText(
            "This device is now trusted. You won't be asked for a code next time.",
            style = Typography.lg.copy(color = colors.labelSecondary, textAlign = TextAlign.Center),
        )
        BasicText(
            "Start over ›",
            modifier = Modifier.clickable(
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                role = Role.Button,
                onClick = onStartOver,
            ),
            style = Typography.lg.copy(color = colors.link),
        )
    }
}
```

```kt title="kotlin/components/Button.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.TextDecoration
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ButtonVariant { Default, Outline, Secondary, Tinted, Ghost, Plain, Destructive, Link }

enum class ButtonSize(
    val height: Dp,
    val horizontalPadding: Dp,
    val spacing: Dp,
    val iconSize: Dp,
    val blockRadius: Dp,
    val isIcon: Boolean,
) {
    Default(36.dp, 16.dp, 6.dp, 16.dp, Radius.md, false),
    Xs(24.dp, 11.dp, 4.dp, 12.dp, Radius.sm, false),
    Sm(32.dp, 12.dp, 4.dp, 16.dp, Radius.md, false),
    Lg(44.dp, 22.dp, 6.dp, 16.dp, Radius.lg, false),
    Xl(56.dp, 31.dp, 8.dp, 16.dp, Radius.xl, false),
    Icon(36.dp, 0.dp, 6.dp, 16.dp, Radius.md, true),
    IconXs(24.dp, 0.dp, 4.dp, 12.dp, Radius.sm, true),
    IconSm(32.dp, 0.dp, 4.dp, 16.dp, Radius.md, true),
    IconLg(44.dp, 0.dp, 6.dp, 16.dp, Radius.lg, true),
    IconXl(56.dp, 0.dp, 8.dp, 16.dp, Radius.xl, true),
    ;

    val textStyle: TextStyle
        get() = when (this) {
            Xs, IconXs -> Typography.xs2
            Lg, Xl -> Typography.base
            else -> Typography.sm
        }
}

@Composable
fun Button(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    block: Boolean = false,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val foreground = buttonForeground(variant, colors, enabled)
    val group = LocalButtonGroup.current?.takeIf { variant != ButtonVariant.Ghost && variant != ButtonVariant.Plain }
    RegisterButtonGroupOutline(group, variant == ButtonVariant.Outline)
    val shape = group.itemShape(if (block) RoundedCornerShape(size.blockRadius) else CircleShape)
    val sizing = when {
        block -> Modifier.fillMaxWidth().height(size.height)
        size.isIcon -> Modifier.size(size.height)
        else -> Modifier.height(size.height)
    }

    Row(
        modifier = modifier
            .then(sizing)
            .clip(shape)
            .background(buttonBackground(variant, colors, pressed && enabled, enabled), shape)
            .then(
                when {
                    variant != ButtonVariant.Outline -> Modifier
                    group != null -> Modifier.buttonGroupEdge(group, colors.separator)
                    else -> Modifier.border(1.dp, colors.separator, shape)
                },
            )
            .clickable(
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.Button,
                onClick = onClick,
            )
            .padding(horizontal = size.horizontalPadding),
        horizontalArrangement = Arrangement.spacedBy(size.spacing, Alignment.CenterHorizontally),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalButtonGroup provides null,
            LocalContentStyle provides size.textStyle.copy(
                color = foreground,
                textDecoration = if (variant == ButtonVariant.Link && pressed && enabled) {
                    TextDecoration.Underline
                } else {
                    null
                },
            ),
            LocalContentColor provides foreground,
            LocalIconSize provides size.iconSize,
        ) {
            content()
        }
    }
}

@Composable
fun Button(
    text: String,
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    block: Boolean = false,
    enabled: Boolean = true,
) {
    Button(onClick, modifier, variant, size, block, enabled) {
        BasicText(text, style = LocalContentStyle.current, maxLines = 1)
    }
}

private fun buttonForeground(variant: ButtonVariant, colors: Colors, enabled: Boolean): Color =
    when (variant) {
        ButtonVariant.Default -> colors.onAccent
        ButtonVariant.Outline, ButtonVariant.Secondary, ButtonVariant.Ghost ->
            if (enabled) colors.label else colors.labelQuaternary
        ButtonVariant.Tinted, ButtonVariant.Plain ->
            if (enabled) colors.link else colors.link.copy(alpha = 0.4f)
        ButtonVariant.Destructive ->
            if (enabled) colors.danger else colors.danger.copy(alpha = 0.4f)
        ButtonVariant.Link -> if (enabled) colors.link else colors.labelQuaternary
    }

private fun buttonBackground(variant: ButtonVariant, colors: Colors, pressed: Boolean, enabled: Boolean): Color =
    when (variant) {
        ButtonVariant.Default -> when {
            !enabled -> colors.accentDisabled
            pressed -> colors.accentPressed
            else -> colors.accent
        }
        ButtonVariant.Outline -> when {
            pressed -> colors.itemPressed
            colors.isDark -> Color.Transparent
            else -> colors.surface
        }
        ButtonVariant.Secondary -> when {
            !enabled -> colors.controlDisabled
            pressed -> colors.controlPressed
            else -> colors.control
        }
        ButtonVariant.Tinted -> if (pressed) colors.accentSurfacePressed else colors.accentSurface
        ButtonVariant.Ghost -> if (pressed) colors.itemPressed else Color.Transparent
        ButtonVariant.Plain -> if (pressed) colors.itemPressed else Color.Transparent
        ButtonVariant.Destructive -> if (pressed) colors.dangerSurfacePressed else colors.dangerSurface
        ButtonVariant.Link -> Color.Transparent
    }
```

```kt title="kotlin/components/ButtonGroup.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.CornerSize
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.Stable
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.drawOutline
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.graphics.drawscope.translate
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.Placeable
import androidx.compose.ui.layout.layout
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.layout.onPlaced
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.semantics.isTraversalGroup
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.constrainHeight
import androidx.compose.ui.unit.constrainWidth
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ButtonGroupOrientation { Horizontal, Vertical }

@Stable
internal class ButtonGroupState(val orientation: ButtonGroupOrientation) {
    var nested by mutableIntStateOf(0)
    var outlined by mutableIntStateOf(0)
}

internal val LocalButtonGroup = compositionLocalOf<ButtonGroupState?> { null }

internal object ButtonGroupFill

private object ButtonGroupDivider

internal fun ButtonGroupState?.itemShape(default: Shape): Shape = if (this == null) default else RectangleShape

@Immutable
internal class ButtonGroupItem(val shape: Shape, val modifier: Modifier)

@Composable
internal fun rememberButtonGroupItem(group: ButtonGroupState?, default: Shape): ButtonGroupItem {
    var edges by remember { mutableIntStateOf(0) }
    val horizontal = group?.orientation != ButtonGroupOrientation.Vertical
    val rtl = LocalLayoutDirection.current == LayoutDirection.Rtl
    val shape = remember(edges, horizontal) {
        val round = if (horizontal) CornerSize(50) else CornerSize(Radius.xl2)
        val square = CornerSize(0)
        val start = if (edges and 1 != 0) round else square
        val end = if (edges and 2 != 0) round else square
        if (horizontal) {
            RoundedCornerShape(topStart = start, topEnd = end, bottomEnd = end, bottomStart = start)
        } else {
            RoundedCornerShape(topStart = start, topEnd = start, bottomEnd = end, bottomStart = end)
        }
    }
    if (group == null || group.nested > 0) return ButtonGroupItem(default, Modifier)
    return ButtonGroupItem(
        shape = shape,
        modifier = Modifier.onPlaced { coordinates ->
            val parent = coordinates.parentLayoutCoordinates ?: return@onPlaced
            val bounds = parent.localBoundingBoxOf(coordinates, clipBounds = false)
            val first: Boolean
            val last: Boolean
            if (horizontal) {
                val left = bounds.left <= 0.5f
                val right = bounds.right >= parent.size.width - 0.5f
                first = if (rtl) right else left
                last = if (rtl) left else right
            } else {
                first = bounds.top <= 0.5f
                last = bounds.bottom >= parent.size.height - 0.5f
            }
            edges = (if (first) 1 else 0) or (if (last) 2 else 0)
        },
    )
}

internal fun Modifier.buttonGroupEdge(group: ButtonGroupState?, color: Color): Modifier {
    if (group == null) return this
    return drawBehind {
        val stroke = 1.dp.toPx()
        if (group.orientation == ButtonGroupOrientation.Horizontal) {
            val x = if (layoutDirection == LayoutDirection.Rtl) 0f else size.width - stroke
            drawRect(color, Offset(x, 0f), Size(stroke, size.height))
        } else {
            drawRect(color, Offset(0f, size.height - stroke), Size(size.width, stroke))
        }
    }
}

@Composable
internal fun RegisterButtonGroupOutline(group: ButtonGroupState?, outlined: Boolean) {
    DisposableEffect(group, outlined) {
        if (group != null && outlined) group.outlined += 1
        onDispose {
            if (group != null && outlined) group.outlined -= 1
        }
    }
}

@Composable
fun ButtonGroup(
    modifier: Modifier = Modifier,
    orientation: ButtonGroupOrientation = ButtonGroupOrientation.Horizontal,
    content: @Composable () -> Unit,
) {
    val parent = LocalButtonGroup.current
    DisposableEffect(parent) {
        parent?.let { it.nested += 1 }
        onDispose { parent?.let { it.nested -= 1 } }
    }
    val state = remember(orientation) { ButtonGroupState(orientation) }
    val colors = EsuissTheme.colors
    val joined = state.nested == 0
    val horizontal = orientation == ButtonGroupOrientation.Horizontal
    val shape = if (horizontal) CircleShape else RoundedCornerShape(Radius.xl2)
    val outline = colors.separator
    Layout(
        content = {
            CompositionLocalProvider(LocalButtonGroup provides state, content = content)
        },
        modifier = modifier
            .semantics { isTraversalGroup = true }
            .then(
                if (joined) {
                    Modifier
                        .clip(shape)
                        .drawWithContent {
                            drawContent()
                            if (state.outlined > 0) {
                                val stroke = 1.dp.toPx()
                                val inset = stroke / 2
                                val path = shape.createOutline(
                                    Size(size.width - stroke, size.height - stroke),
                                    layoutDirection,
                                    this,
                                )
                                translate(inset, inset) {
                                    drawOutline(path, outline, style = Stroke(stroke))
                                }
                            }
                        }
                } else {
                    Modifier
                },
            ),
    ) { measurables, constraints ->
        val gap = if (joined) 0 else 8.dp.roundToPx()
        val items = measurables.filter { it.layoutId != ButtonGroupDivider }
        if (horizontal) {
            val height = if (constraints.hasFixedHeight) {
                constraints.maxHeight
            } else {
                constraints.constrainHeight(items.maxOfOrNull { it.maxIntrinsicHeight(Constraints.Infinity) } ?: 0)
            }
            val fills = measurables.count { it.layoutId == ButtonGroupFill }
            val placeables = arrayOfNulls<Placeable>(measurables.size)
            var used = 0
            measurables.forEachIndexed { index, measurable ->
                if (measurable.layoutId != ButtonGroupFill) {
                    val placeable = measurable.measure(Constraints(minHeight = height, maxHeight = height))
                    placeables[index] = placeable
                    used += placeable.width
                }
            }
            val gaps = gap * (items.size - 1).coerceAtLeast(0)
            val remaining = if (constraints.hasBoundedWidth) {
                (constraints.maxWidth - used - gaps).coerceAtLeast(0)
            } else {
                0
            }
            measurables.forEachIndexed { index, measurable ->
                if (measurable.layoutId == ButtonGroupFill) {
                    val placeable = if (constraints.hasBoundedWidth) {
                        val width = remaining / fills
                        measurable.measure(Constraints(width, width, height, height))
                    } else {
                        measurable.measure(Constraints(minHeight = height, maxHeight = height))
                    }
                    placeables[index] = placeable
                    used += placeable.width
                }
            }
            val width = constraints.constrainWidth(used + gaps)
            layout(width, height) {
                var x = 0
                measurables.forEachIndexed { index, measurable ->
                    val placeable = placeables[index] ?: return@forEachIndexed
                    val divider = measurable.layoutId == ButtonGroupDivider
                    placeable.placeRelative(x, 0, zIndex = if (divider) 1f else 0f)
                    if (!divider) x += placeable.width + gap
                }
            }
        } else {
            val width = if (constraints.hasFixedWidth) {
                constraints.maxWidth
            } else {
                constraints.constrainWidth(items.maxOfOrNull { it.maxIntrinsicWidth(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map { it.measure(Constraints(minWidth = width, maxWidth = width)) }
            val gaps = gap * (items.size - 1).coerceAtLeast(0)
            val height = constraints.constrainHeight(
                placeables.filterIndexed { index, _ -> measurables[index].layoutId != ButtonGroupDivider }.sumOf { it.height } + gaps,
            )
            layout(width, height) {
                var y = 0
                measurables.forEachIndexed { index, measurable ->
                    val divider = measurable.layoutId == ButtonGroupDivider
                    placeables[index].placeRelative(0, y, zIndex = if (divider) 1f else 0f)
                    if (!divider) y += placeables[index].height + gap
                }
            }
        }
    }
}

@Composable
fun ButtonGroupText(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val shape = LocalButtonGroup.current.itemShape(CircleShape)
    Row(
        modifier = modifier
            .clip(shape)
            .background(colors.control, shape)
            .padding(horizontal = 10.dp),
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalButtonGroup provides null,
            LocalContentStyle provides Typography.sm.copy(color = colors.label),
            LocalContentColor provides colors.label,
            LocalIconSize provides 16.dp,
        ) {
            content()
        }
    }
}

@Composable
fun ButtonGroupSeparator(
    modifier: Modifier = Modifier,
    orientation: Orientation = Orientation.Vertical,
    color: Color = Color.Unspecified,
) {
    val line = color.takeOrElse { EsuissTheme.colors.label.copy(alpha = 0.2f) }
    Box(
        modifier = modifier
            .layoutId(ButtonGroupDivider)
            .then(
                if (orientation == Orientation.Vertical) {
                    Modifier.layout { measurable, constraints ->
                        val placeable = measurable.measure(constraints.copy(minWidth = 0, maxWidth = 0))
                        layout(0, placeable.height) { placeable.place(0, 0) }
                    }
                } else {
                    Modifier.layout { measurable, constraints ->
                        val placeable = measurable.measure(constraints.copy(minHeight = 0, maxHeight = 0))
                        layout(placeable.width, 0) { placeable.place(0, 0) }
                    }
                },
            )
            .drawBehind {
                val stroke = 1.dp.toPx()
                val inset = 9.dp.toPx()
                if (orientation == Orientation.Vertical) {
                    val x = if (layoutDirection == LayoutDirection.Rtl) -stroke else 0f
                    drawRect(line, Offset(x, inset), Size(stroke, (size.height - inset * 2).coerceAtLeast(0f)))
                } else {
                    drawRect(line, Offset(inset, 0f), Size((size.width - inset * 2).coerceAtLeast(0f), stroke))
                }
            },
    )
}
```

```kt title="kotlin/components/Content.kt"
package com.esuiss.ui.components

import androidx.compose.runtime.compositionLocalOf
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp

val LocalContentStyle = compositionLocalOf { TextStyle.Default }

val LocalContentColor = compositionLocalOf { Color.Unspecified }

val LocalIconSize = compositionLocalOf { 20.dp }
```

```kt title="kotlin/components/Field.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.LayoutScopeMarker
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalConfiguration
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class FieldOrientation { Vertical, Horizontal, Responsive }

enum class FieldGroupVariant { Default, Inset }

enum class FieldLegendVariant { Legend, Label }

@Immutable
internal class FieldState(val enabled: Boolean, val invalid: Boolean)

internal val LocalFieldState = staticCompositionLocalOf { FieldState(enabled = true, invalid = false) }

private val LocalFieldSetInset = staticCompositionLocalOf { false }

private val LocalFieldGroupVariant = staticCompositionLocalOf<FieldGroupVariant?> { null }

private val LocalFieldInset = staticCompositionLocalOf { false }

@LayoutScopeMarker
@Immutable
interface FieldScope {
    fun Modifier.weight(weight: Float): Modifier
}

private class RowFieldScope(private val scope: RowScope) : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = with(scope) { this@weight.weight(weight, true) }
}

private object ColumnFieldScope : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = this
}

@Composable
fun FieldSet(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    enabled: Boolean = true,
    content: @Composable ColumnScope.() -> Unit,
) {
    val inset = variant == FieldGroupVariant.Inset
    CompositionLocalProvider(
        LocalFieldSetInset provides inset,
        LocalFieldState provides FieldState(enabled, LocalFieldState.current.invalid),
    ) {
        Column(
            modifier = modifier.fillMaxWidth(),
            verticalArrangement = Arrangement.spacedBy(if (inset) 8.dp else 24.dp),
            content = content,
        )
    }
}

@Composable
fun FieldLegend(
    text: String,
    modifier: Modifier = Modifier,
    variant: FieldLegendVariant = FieldLegendVariant.Legend,
) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    val enabled = LocalFieldState.current.enabled
    val style = if (inset) {
        Typography.xs.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary)
    } else {
        Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary, fontWeight = FontWeight.SemiBold)
    }
    BasicText(
        text = if (inset) text.uppercase() else text,
        modifier = modifier
            .then(if (variant == FieldLegendVariant.Legend) Modifier.semantics { heading() } else Modifier)
            .padding(start = if (inset) 16.dp else 0.dp, bottom = if (inset) 0.dp else 12.dp),
        style = style,
    )
}

@Composable
fun FieldGroup(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    CompositionLocalProvider(
        LocalFieldSetInset provides false,
        LocalFieldGroupVariant provides variant,
    ) {
        if (variant == FieldGroupVariant.Inset) {
            FormDividedStack(
                orientation = Orientation.Vertical,
                dividerColor = colors.separator,
                modifier = modifier
                    .fillMaxWidth()
                    .clip(RoundedCornerShape(Radius.xl2))
                    .background(colors.surfaceSecondary),
                dividerInsetStart = 16.dp,
                content = content,
            )
        } else {
            Column(
                modifier = modifier.fillMaxWidth(),
                verticalArrangement = Arrangement.spacedBy(28.dp),
            ) {
                content()
            }
        }
    }
}

@Composable
fun Field(
    modifier: Modifier = Modifier,
    orientation: FieldOrientation = FieldOrientation.Vertical,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = false,
    content: @Composable FieldScope.() -> Unit,
) {
    val inset = LocalFieldGroupVariant.current == FieldGroupVariant.Inset
    val horizontal = when (orientation) {
        FieldOrientation.Vertical -> false
        FieldOrientation.Horizontal -> true
        FieldOrientation.Responsive -> LocalConfiguration.current.screenWidthDp >= 768
    }
    val sizing = modifier
        .fillMaxWidth()
        .then(if (inset) Modifier.heightIn(min = 44.dp).padding(horizontal = 16.dp, vertical = 6.dp) else Modifier)
    CompositionLocalProvider(
        LocalFieldGroupVariant provides null,
        LocalFieldInset provides inset,
        LocalFieldState provides FieldState(enabled, invalid),
    ) {
        if (horizontal) {
            Row(
                modifier = sizing,
                horizontalArrangement = Arrangement.spacedBy(12.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                val scope = remember(this) { RowFieldScope(this) }
                scope.content()
            }
        } else {
            Column(
                modifier = sizing,
                verticalArrangement = Arrangement.spacedBy(12.dp, Alignment.CenterVertically),
            ) {
                ColumnFieldScope.content()
            }
        }
    }
}

@Composable
fun FieldScope.FieldContent(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(
        modifier = modifier.weight(1f),
        verticalArrangement = Arrangement.spacedBy(4.dp),
        content = content,
    )
}

@Composable
fun FieldLabel(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = if (LocalFieldInset.current) FontWeight.Normal else FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldTitle(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldDescription(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    BasicText(
        text = text,
        modifier = modifier.padding(start = if (inset) 16.dp else 0.dp),
        style = (if (inset) Typography.xs else Typography.sm).copy(color = colors.labelSecondary),
    )
}

@Composable
fun FieldSeparator(
    modifier: Modifier = Modifier,
    text: String? = null,
) {
    val colors = EsuissTheme.colors
    Box(
        modifier = modifier
            .fillMaxWidth()
            .layout { measurable, constraints ->
                val placeable = measurable.measure(constraints)
                val overlap = 8.dp.roundToPx()
                val height = (placeable.height - overlap * 2).coerceAtLeast(0)
                layout(placeable.width, height) { placeable.place(0, -overlap) }
            }
            .heightIn(min = 20.dp),
        contentAlignment = Alignment.Center,
    ) {
        Separator()
        if (text != null) {
            BasicText(
                text = text,
                modifier = Modifier.background(colors.surface).padding(horizontal = 8.dp),
                style = Typography.sm.copy(color = colors.labelSecondary),
            )
        }
    }
}

@Composable
fun FieldError(text: String?, modifier: Modifier = Modifier) {
    if (text.isNullOrEmpty()) return
    BasicText(
        text = text,
        modifier = modifier.semantics { liveRegion = LiveRegionMode.Polite },
        style = Typography.sm.copy(color = EsuissTheme.colors.danger),
    )
}

@Composable
fun FieldError(errors: List<String?>, modifier: Modifier = Modifier) {
    val messages = errors.filterNotNull().filter { it.isNotEmpty() }.distinct()
    val text = when (messages.size) {
        0 -> null
        1 -> messages[0]
        else -> messages.joinToString("\n") { "• $it" }
    }
    FieldError(text, modifier)
}
```

```kt title="kotlin/components/FormSupport.kt"
package com.esuiss.ui.components

import android.provider.Settings
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.text.selection.TextSelectionColors
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.constrainHeight
import androidx.compose.ui.unit.constrainWidth
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.Shadow

internal val FormShadowXs = Shadow(0.dp, 1.dp, 2.dp, Color.Black.copy(alpha = 0.05f))

internal val FormShadowSm = Shadow(0.dp, 1.dp, 3.dp, Color.Black.copy(alpha = 0.1f))

internal val FormEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

internal fun Modifier.formTouchTarget(): Modifier = layout { measurable, constraints ->
    val minimum = 48.dp.roundToPx()
    val placeable = measurable.measure(constraints)
    val width = constraints.constrainWidth(maxOf(placeable.width, minimum))
    val height = constraints.constrainHeight(maxOf(placeable.height, minimum))
    layout(width, height) {
        placeable.place((width - placeable.width) / 2, (height - placeable.height) / 2)
    }
}

@Composable
internal fun formReducedMotion(): Boolean {
    val context = LocalContext.current
    return remember(context) {
        Settings.Global.getFloat(context.contentResolver, Settings.Global.ANIMATOR_DURATION_SCALE, 1f) == 0f
    }
}

internal fun formSelectionColors(colors: Colors) = TextSelectionColors(
    handleColor = colors.accent,
    backgroundColor = colors.accent.copy(alpha = 0.3f),
)

internal fun Modifier.formInputSurface(
    colors: Colors,
    shape: Shape,
    focused: Boolean,
    invalid: Boolean,
    enabled: Boolean,
): Modifier {
    val background = when {
        !enabled -> colors.controlDisabled
        invalid -> colors.danger.copy(alpha = if (colors.isDark) 0.1f else 0.05f)
        else -> colors.control
    }
    val border = when {
        invalid -> colors.danger
        focused -> colors.focus
        else -> Color.Transparent
    }
    return clip(shape).background(background, shape).border(1.dp, border, shape)
}

@Composable
internal fun FormDividedStack(
    orientation: Orientation,
    dividerColor: Color,
    modifier: Modifier = Modifier,
    dividerInsetStart: Dp = 0.dp,
    content: @Composable () -> Unit,
) {
    val boundaries = remember { mutableStateOf(IntArray(0)) }
    val vertical = orientation == Orientation.Vertical
    Layout(
        content = content,
        modifier = modifier.drawWithContent {
            drawContent()
            val stroke = 1.dp.toPx()
            val inset = dividerInsetStart.toPx()
            boundaries.value.forEach { position ->
                if (vertical) {
                    val start = if (layoutDirection == LayoutDirection.Rtl) 0f else inset
                    drawRect(dividerColor, Offset(start, position.toFloat()), Size(size.width - inset, stroke))
                } else {
                    val x = if (layoutDirection == LayoutDirection.Rtl) size.width - position - stroke else position.toFloat()
                    drawRect(dividerColor, Offset(x, 0f), Size(stroke, size.height))
                }
            }
        },
    ) { measurables, constraints ->
        if (vertical) {
            val width = if (constraints.hasFixedWidth) {
                constraints.maxWidth
            } else {
                constraints.constrainWidth(measurables.maxOfOrNull { it.maxIntrinsicWidth(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map {
                it.measure(Constraints(minWidth = width, maxWidth = width))
            }
            val offsets = IntArray(placeables.size)
            var y = 0
            placeables.forEachIndexed { index, placeable ->
                offsets[index] = y
                y += placeable.height
            }
            val next = offsets.drop(1).toIntArray()
            if (!next.contentEquals(boundaries.value)) boundaries.value = next
            layout(width, constraints.constrainHeight(y)) {
                placeables.forEachIndexed { index, placeable -> placeable.placeRelative(0, offsets[index]) }
            }
        } else {
            val height = if (constraints.hasFixedHeight) {
                constraints.maxHeight
            } else {
                constraints.constrainHeight(measurables.maxOfOrNull { it.maxIntrinsicHeight(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map {
                it.measure(Constraints(minHeight = height, maxHeight = height))
            }
            val offsets = IntArray(placeables.size)
            var x = 0
            placeables.forEachIndexed { index, placeable ->
                offsets[index] = x
                x += placeable.width
            }
            val next = offsets.drop(1).toIntArray()
            if (!next.contentEquals(boundaries.value)) boundaries.value = next
            layout(constraints.constrainWidth(x), height) {
                placeables.forEachIndexed { index, placeable -> placeable.placeRelative(offsets[index], 0) }
            }
        }
    }
}
```

```kt title="kotlin/components/Haptics.kt"
package com.esuiss.ui.components

import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.hapticfeedback.HapticFeedback
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.platform.LocalHapticFeedback

val LocalHapticsEnabled = staticCompositionLocalOf { true }

@Composable
fun ProvideHaptics(enabled: Boolean, content: @Composable () -> Unit) {
    CompositionLocalProvider(LocalHapticsEnabled provides enabled, content = content)
}

internal class Haptics(private val feedback: HapticFeedback, private val enabled: Boolean) {
    fun perform(type: HapticFeedbackType) {
        if (enabled) feedback.performHapticFeedback(type)
    }

    fun toggle(on: Boolean) = perform(if (on) HapticFeedbackType.ToggleOn else HapticFeedbackType.ToggleOff)

    fun selection() = perform(HapticFeedbackType.SegmentTick)
}

@Composable
internal fun rememberHaptics(): Haptics {
    val feedback = LocalHapticFeedback.current
    val enabled = LocalHapticsEnabled.current
    return remember(feedback, enabled) { Haptics(feedback, enabled) }
}
```

```kt title="kotlin/components/Icon.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.size
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.ColorFilter
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.unit.Dp
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun Icon(
    imageVector: ImageVector,
    contentDescription: String?,
    modifier: Modifier = Modifier,
    size: Dp = LocalIconSize.current,
    tint: Color = LocalContentColor.current.takeOrElse { EsuissTheme.colors.label },
) {
    Image(
        imageVector = imageVector,
        contentDescription = contentDescription,
        modifier = modifier.size(size),
        colorFilter = ColorFilter.tint(tint),
    )
}
```

```kt title="kotlin/components/InputOTP.kt"
package com.esuiss.ui.components

import androidx.compose.animation.animateColorAsState
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.infiniteRepeatable
import androidx.compose.animation.core.keyframes
import androidx.compose.animation.core.rememberInfiniteTransition
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsFocusedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.autofill.ContentType
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.contentType
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.TextRange
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.unit.dp
import androidx.compose.ui.zIndex
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Minus
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

internal enum class OtpTone { Default, Verifying, Verified, Invalid }

@Immutable
internal class OtpAppearance(val tone: OtpTone, val pop: Boolean)

internal val LocalOtpAppearance = staticCompositionLocalOf { OtpAppearance(OtpTone.Default, pop = false) }

@Immutable
private class OtpState(
    val value: String,
    val maxLength: Int,
    val focused: Boolean,
    val enabled: Boolean,
    val invalid: Boolean,
    val appearance: OtpAppearance,
)

private val LocalOtpState = staticCompositionLocalOf {
    OtpState("", 0, focused = false, enabled = true, invalid = false, appearance = OtpAppearance(OtpTone.Default, pop = false))
}

@Composable
fun InputOTP(
    value: String,
    onValueChange: (String) -> Unit,
    maxLength: Int,
    modifier: Modifier = Modifier,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = LocalFieldState.current.invalid,
    readOnly: Boolean = false,
    keyboardType: KeyboardType = KeyboardType.NumberPassword,
    onComplete: ((String) -> Unit)? = null,
    keyboardActions: KeyboardActions = KeyboardActions.Default,
    interactionSource: MutableInteractionSource? = null,
    content: @Composable RowScope.() -> Unit = {
        InputOTPGroup {
            repeat(maxLength) { InputOTPSlot(it) }
        }
    },
) {
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val focused by source.collectIsFocusedAsState()
    val currentValue by rememberUpdatedState(value)
    val appearance = LocalOtpAppearance.current
    val numeric = keyboardType == KeyboardType.NumberPassword || keyboardType == KeyboardType.Number
    BasicTextField(
        value = TextFieldValue(value, TextRange(value.length)),
        onValueChange = { next ->
            val filtered = next.text
                .filter { if (numeric) it.isDigit() else it.isLetterOrDigit() }
                .take(maxLength)
            if (filtered != currentValue) {
                onValueChange(filtered)
                if (filtered.length == maxLength) onComplete?.invoke(filtered)
            }
        },
        modifier = modifier.semantics { contentType = ContentType.SmsOtpCode },
        enabled = enabled,
        readOnly = readOnly,
        textStyle = TextStyle(color = Color.Transparent),
        keyboardOptions = KeyboardOptions(keyboardType = keyboardType, imeAction = ImeAction.Done),
        keyboardActions = keyboardActions,
        singleLine = true,
        interactionSource = source,
        cursorBrush = SolidColor(Color.Transparent),
        decorationBox = {
            CompositionLocalProvider(LocalOtpState provides OtpState(value, maxLength, focused, enabled, invalid, appearance)) {
                Row(
                    modifier = Modifier.clearAndSetSemantics {},
                    horizontalArrangement = Arrangement.spacedBy(8.dp),
                    verticalAlignment = Alignment.CenterVertically,
                    content = content,
                )
            }
        },
    )
}

@Composable
fun InputOTPGroup(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    Row(
        modifier = modifier,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
        content = content,
    )
}

@Composable
fun InputOTPSlot(index: Int, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val state = LocalOtpState.current
    val tone = state.appearance.tone
    val char = state.value.getOrNull(index)
    val active = state.focused && state.maxLength > 0 &&
        index == state.value.length.coerceAtMost(state.maxLength - 1)
    val shape = RoundedCornerShape(Radius.lg)
    val dangerFill = colors.danger.copy(alpha = if (colors.isDark) 0.1f else 0.05f)
    val background = when {
        !state.enabled -> colors.controlDisabled
        tone == OtpTone.Verified -> colors.successSurface
        tone == OtpTone.Invalid || state.invalid -> dangerFill
        else -> colors.control
    }
    val border = when {
        !state.enabled -> Color.Transparent
        tone == OtpTone.Verified -> colors.success
        tone == OtpTone.Invalid -> colors.danger
        active -> colors.accent
        state.invalid -> colors.danger
        else -> Color.Transparent
    }
    val foreground = when {
        !state.enabled -> colors.labelQuaternary
        tone == OtpTone.Verified -> colors.success
        tone == OtpTone.Invalid -> colors.danger
        else -> colors.label
    }
    val spec = tween<Color>(if (tone == OtpTone.Default) 150 else 300, easing = FormEasing)
    val animatedBackground by animateColorAsState(background, spec, label = "background")
    val animatedBorder by animateColorAsState(border, spec, label = "border")
    val animatedForeground by animateColorAsState(foreground, spec, label = "foreground")
    val alpha by animateFloatAsState(if (tone == OtpTone.Verifying) 0.6f else 1f, tween(300, easing = FormEasing), label = "alpha")
    val reduced = formReducedMotion()
    val scale = remember { Animatable(1f) }
    val pop = state.appearance.pop
    LaunchedEffect(char) {
        if (char != null && pop && !reduced) {
            scale.snapTo(0.8f)
            scale.animateTo(
                1f,
                keyframes {
                    durationMillis = 240
                    0.8f at 0 using FormEasing
                    1.08f at 144 using FormEasing
                    1f at 240
                },
            )
        }
    }
    Box(
        modifier = modifier
            .zIndex(if (active) 1f else 0f)
            .graphicsLayer {
                this.alpha = alpha
                scaleX = scale.value
                scaleY = scale.value
            }
            .size(width = 44.dp, height = 52.dp)
            .background(animatedBackground, shape)
            .border(1.5.dp, animatedBorder, shape),
        contentAlignment = Alignment.Center,
    ) {
        if (char != null) {
            BasicText(
                char.toString(),
                style = Typography.xl.copy(
                    color = animatedForeground,
                    fontWeight = FontWeight.SemiBold,
                    fontFeatureSettings = "tnum",
                ),
            )
        } else if (active && tone == OtpTone.Default) {
            OtpCaret()
        }
    }
}

@Composable
fun InputOTPSeparator(modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalOtpState.current.enabled
    Icon(
        PhosphorIcons.Regular.Minus,
        contentDescription = null,
        modifier = modifier,
        size = 16.dp,
        tint = if (enabled) colors.label else colors.labelQuaternary,
    )
}

@Composable
private fun OtpCaret() {
    val reduced = formReducedMotion()
    val transition = rememberInfiniteTransition(label = "caret")
    val blink by transition.animateFloat(
        initialValue = 1f,
        targetValue = 1f,
        animationSpec = infiniteRepeatable(
            keyframes {
                durationMillis = 1000
                1f at 0
                0f at 200
                0f at 500
                1f at 700
                1f at 1000
            },
        ),
        label = "caret",
    )
    Box(
        Modifier
            .graphicsLayer { alpha = if (reduced) 1f else blink }
            .size(width = 2.dp, height = 24.dp)
            .background(EsuissTheme.colors.accent, CircleShape),
    )
}
```

```kt title="kotlin/components/KeyboardScrollView.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.ScrollState
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.ime
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.layout.boundsInWindow
import androidx.compose.ui.layout.onGloballyPositioned
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalFocusManager
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.unit.dp

@Composable
fun KeyboardScrollView(
    modifier: Modifier = Modifier,
    state: ScrollState = rememberScrollState(),
    contentPadding: PaddingValues = PaddingValues(0.dp),
    verticalArrangement: Arrangement.Vertical = Arrangement.Top,
    content: @Composable ColumnScope.() -> Unit,
) {
    val density = LocalDensity.current
    val view = LocalView.current
    val focus = LocalFocusManager.current
    val ime = WindowInsets.ime.getBottom(density)
    val keyboard = if (ime > 0) ime + (LocalKeyboardAccessory.current?.height ?: 0) else 0
    var bottom by remember { mutableFloatStateOf(0f) }
    val windowHeight = view.rootView.height
    val overlap = if (keyboard > 0 && windowHeight > 0) {
        (bottom - (windowHeight - keyboard)).coerceAtLeast(0f)
    } else {
        0f
    }
    Box(
        modifier = modifier.onGloballyPositioned { bottom = it.boundsInWindow().bottom },
    ) {
        Column(
            modifier = Modifier
                .fillMaxSize()
                .padding(bottom = with(density) { overlap.toDp() })
                .pointerInput(focus) { detectTapGestures { focus.clearFocus() } }
                .verticalScroll(state)
                .padding(contentPadding),
            verticalArrangement = verticalArrangement,
            content = content,
        )
    }
}
```

```kt title="kotlin/components/Keypad.kt"
package com.esuiss.ui.components

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.AnimationVector1D
import androidx.compose.animation.core.keyframes
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Backspace
import com.adamglin.phosphoricons.regular.Fingerprint
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

private val KeypadKeySize = 72.dp

private val KeypadColumnGap = 24.dp

private val KeypadRowGap = 16.dp

private val KeypadRows = listOf(listOf(1, 2, 3), listOf(4, 5, 6), listOf(7, 8, 9))

sealed interface KeypadKey {
    data class Digit(val value: Int) : KeypadKey

    data object Decimal : KeypadKey

    data object Biometric : KeypadKey

    data object Delete : KeypadKey
}

sealed interface KeypadAccessory {
    data object None : KeypadAccessory

    data class Decimal(
        val separator: String = ".",
        val label: String = "Decimal separator",
    ) : KeypadAccessory

    data class Biometric(
        val icon: ImageVector = PhosphorIcons.Regular.Fingerprint,
        val label: String = "Use biometrics",
    ) : KeypadAccessory
}

@Composable
fun Keypad(
    onKeyPress: (KeypadKey) -> Unit,
    modifier: Modifier = Modifier,
    accessory: KeypadAccessory = KeypadAccessory.None,
    deleteLabel: String = "Delete",
    enabled: Boolean = true,
) {
    Column(
        modifier = modifier,
        verticalArrangement = Arrangement.spacedBy(KeypadRowGap),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        KeypadRows.forEach { row ->
            Row(horizontalArrangement = Arrangement.spacedBy(KeypadColumnGap)) {
                row.forEach { digit -> KeypadDigit(digit, enabled, onKeyPress) }
            }
        }
        Row(horizontalArrangement = Arrangement.spacedBy(KeypadColumnGap)) {
            when (accessory) {
                KeypadAccessory.None -> Box(Modifier.size(KeypadKeySize))
                is KeypadAccessory.Decimal -> KeypadButton(
                    onClick = { onKeyPress(KeypadKey.Decimal) },
                    enabled = enabled,
                    filled = true,
                    contentDescription = accessory.label,
                ) {
                    KeypadText(accessory.separator)
                }
                is KeypadAccessory.Biometric -> KeypadButton(
                    onClick = { onKeyPress(KeypadKey.Biometric) },
                    enabled = enabled,
                    filled = false,
                    contentDescription = accessory.label,
                ) {
                    Icon(accessory.icon, contentDescription = null, size = 32.dp)
                }
            }
            KeypadDigit(0, enabled, onKeyPress)
            KeypadButton(
                onClick = { onKeyPress(KeypadKey.Delete) },
                enabled = enabled,
                filled = false,
                contentDescription = deleteLabel,
            ) {
                Icon(PhosphorIcons.Regular.Backspace, contentDescription = null, size = 28.dp)
            }
        }
    }
}

@Composable
private fun KeypadDigit(digit: Int, enabled: Boolean, onKeyPress: (KeypadKey) -> Unit) {
    KeypadButton(onClick = { onKeyPress(KeypadKey.Digit(digit)) }, enabled = enabled, filled = true) {
        KeypadText(digit.toString())
    }
}

@Composable
private fun KeypadText(text: String) {
    BasicText(
        text,
        style = Typography.xl2.copy(
            color = LocalContentColor.current,
            fontWeight = FontWeight.Medium,
            fontFeatureSettings = "tnum",
        ),
    )
}

@Composable
private fun KeypadButton(
    onClick: () -> Unit,
    enabled: Boolean,
    filled: Boolean,
    contentDescription: String? = null,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val haptics = rememberHaptics()
    val background = when {
        !enabled -> if (filled) colors.controlDisabled else Color.Transparent
        pressed -> colors.controlPressed
        filled -> colors.control
        else -> Color.Transparent
    }
    val foreground = if (enabled) colors.label else colors.labelQuaternary
    Box(
        modifier = Modifier
            .size(KeypadKeySize)
            .clip(CircleShape)
            .background(background, CircleShape)
            .clickable(
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.Button,
            ) {
                haptics.selection()
                onClick()
            }
            .then(
                if (contentDescription != null) {
                    Modifier.semantics { this.contentDescription = contentDescription }
                } else {
                    Modifier
                },
            ),
        contentAlignment = Alignment.Center,
    ) {
        CompositionLocalProvider(LocalContentColor provides foreground) {
            content()
        }
    }
}

internal suspend fun Animatable<Float, AnimationVector1D>.shake() {
    snapTo(0f)
    animateTo(
        0f,
        keyframes {
            durationMillis = 400
            -8f at 60
            7f at 140
            -5f at 220
            3f at 300
            0f at 400
        },
    )
}
```

```kt title="kotlin/components/Label.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun Label(
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val color = if (enabled) colors.label else colors.labelQuaternary
    Row(
        modifier = modifier,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalContentStyle provides Typography.base.copy(color = color, fontWeight = FontWeight.SemiBold),
            LocalContentColor provides color,
        ) {
            content()
        }
    }
}

@Composable
fun Label(
    text: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    Label(modifier, enabled) {
        BasicText(text, style = LocalContentStyle.current)
    }
}
```

```kt title="kotlin/components/Screen.kt"
package com.esuiss.ui.components

import android.app.Activity
import android.content.Context
import android.content.ContextWrapper
import android.os.Build
import android.view.View
import android.view.Window
import android.view.WindowInsetsController
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ExperimentalLayoutApi
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.WindowInsetsSides
import androidx.compose.foundation.layout.displayCutout
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.only
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.statusBarsIgnoringVisibility
import androidx.compose.foundation.layout.systemBars
import androidx.compose.foundation.layout.union
import androidx.compose.foundation.layout.windowInsetsPadding
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Stable
internal class KeyboardAccessoryInset {
    var height by mutableIntStateOf(0)
}

internal val LocalKeyboardAccessory = staticCompositionLocalOf<KeyboardAccessoryInset?> { null }

enum class ScreenEdge { Top, Bottom, Left, Right }

enum class ScreenVariant { Default, Secondary }

private val AllScreenEdges = setOf(ScreenEdge.Top, ScreenEdge.Bottom, ScreenEdge.Left, ScreenEdge.Right)

private fun Set<ScreenEdge>.sides(): WindowInsetsSides? = map {
    when (it) {
        ScreenEdge.Top -> WindowInsetsSides.Top
        ScreenEdge.Bottom -> WindowInsetsSides.Bottom
        ScreenEdge.Left -> WindowInsetsSides.Left
        ScreenEdge.Right -> WindowInsetsSides.Right
    }
}.reduceOrNull { sides, side -> sides + side }

internal tailrec fun Context.findActivity(): Activity? = when (this) {
    is Activity -> this
    is ContextWrapper -> baseContext.findActivity()
    else -> null
}

@Suppress("DEPRECATION")
private fun Window.applyLightBars(light: Boolean) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        val mask = WindowInsetsController.APPEARANCE_LIGHT_STATUS_BARS or WindowInsetsController.APPEARANCE_LIGHT_NAVIGATION_BARS
        insetsController?.setSystemBarsAppearance(if (light) mask else 0, mask)
        return
    }
    var flags = decorView.systemUiVisibility
    flags = if (light) flags or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR else flags and View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR.inv()
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        flags = if (light) flags or View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR else flags and View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR.inv()
    }
    if (decorView.systemUiVisibility != flags) decorView.systemUiVisibility = flags
}

@OptIn(ExperimentalLayoutApi::class)
@Composable
fun Screen(
    modifier: Modifier = Modifier,
    edges: Set<ScreenEdge> = AllScreenEdges,
    variant: ScreenVariant = ScreenVariant.Default,
    content: @Composable BoxScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val view = LocalView.current
    val light = !colors.isDark
    SideEffect {
        if (!view.isInEditMode) view.context.findActivity()?.window?.applyLightBars(light)
    }
    val sides = edges.sides()
    val accessory = remember { KeyboardAccessoryInset() }
    val fill = when (variant) {
        ScreenVariant.Default -> colors.surface
        ScreenVariant.Secondary -> colors.surfaceSecondary
    }
    Box(
        modifier = modifier
            .fillMaxSize()
            .background(fill)
            .then(
                if (sides != null) {
                    Modifier.windowInsetsPadding(WindowInsets.systemBars.union(WindowInsets.displayCutout).union(WindowInsets.statusBarsIgnoringVisibility).only(sides))
                } else {
                    Modifier
                },
            ),
    ) {
        CompositionLocalProvider(
            LocalKeyboardAccessory provides accessory,
            LocalContentStyle provides Typography.base.copy(color = colors.label),
            LocalContentColor provides colors.label,
        ) {
            content()
        }
    }
}

@Composable
fun ScreenContent(
    modifier: Modifier = Modifier,
    scrollable: Boolean = false,
    contentPadding: PaddingValues = PaddingValues(16.dp),
    verticalArrangement: Arrangement.Vertical = Arrangement.spacedBy(16.dp),
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(
        modifier = modifier
            .fillMaxWidth()
            .then(if (scrollable) Modifier.verticalScroll(rememberScrollState()) else Modifier)
            .padding(contentPadding),
        verticalArrangement = verticalArrangement,
        content = content,
    )
}
```

```kt title="kotlin/components/Separator.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.width
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun Separator(
    modifier: Modifier = Modifier,
    orientation: Orientation = Orientation.Horizontal,
) {
    val sizing = if (orientation == Orientation.Horizontal) {
        Modifier.fillMaxWidth().height(1.dp)
    } else {
        Modifier.fillMaxHeight().width(1.dp)
    }
    Box(modifier.then(sizing).background(EsuissTheme.colors.separator))
}
```

```kt title="kotlin/interactions/OtpAutofill.kt"
package com.esuiss.ui.interactions

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.MutableTransitionState
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.slideInVertically
import androidx.compose.animation.slideOutVertically
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsFocusedAsState
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.ime
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalWindowInfo
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.IntRect
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.em
import androidx.compose.ui.window.Popup
import androidx.compose.ui.window.PopupPositionProvider
import androidx.compose.ui.window.PopupProperties
import com.esuiss.ui.components.FormEasing
import com.esuiss.ui.components.InputOTP
import com.esuiss.ui.components.InputOTPGroup
import com.esuiss.ui.components.InputOTPSlot
import com.esuiss.ui.components.LocalOtpAppearance
import com.esuiss.ui.components.OtpAppearance
import com.esuiss.ui.components.OtpTone
import com.esuiss.ui.components.formReducedMotion
import com.esuiss.ui.components.rememberHaptics
import com.esuiss.ui.components.shake
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

private const val FillInterval = 70L

private const val InvalidHold = 600L

enum class OtpAutofillState { Idle, Filling, Verifying, Verified, Invalid }

@Stable
internal class OtpAutofillController(private val scope: CoroutineScope) {
    var state by mutableStateOf(OtpAutofillState.Idle)
    var value by mutableStateOf("")
    var focused by mutableStateOf(false)
    var maxLength = 0
    var onVerify: suspend (String) -> Boolean = { true }
    var perform: (HapticFeedbackType) -> Unit = {}
    var reduced = false
    val focusRequester = FocusRequester()
    val offset = Animatable(0f)
    private var job: Job? = null

    val locked: Boolean
        get() = state == OtpAutofillState.Filling || state == OtpAutofillState.Verifying || state == OtpAutofillState.Verified

    fun fill(code: String) {
        val digits = code.filterNot { it.isWhitespace() }.take(maxLength)
        if (digits.isEmpty()) return
        job?.cancel()
        job = scope.launch {
            state = OtpAutofillState.Filling
            for (index in 1..digits.length) {
                value = digits.take(index)
                delay(FillInterval)
            }
            if (digits.length == maxLength) verify(digits) else state = OtpAutofillState.Idle
        }
    }

    fun type(next: String) {
        if (next.length - value.length > 1) {
            fill(next)
            return
        }
        job?.cancel()
        state = OtpAutofillState.Idle
        value = next
        if (next.length == maxLength) job = scope.launch { verify(next) }
    }

    private suspend fun verify(code: String) {
        state = OtpAutofillState.Verifying
        if (onVerify(code)) {
            state = OtpAutofillState.Verified
            perform(HapticFeedbackType.Confirm)
            return
        }
        state = OtpAutofillState.Invalid
        perform(HapticFeedbackType.Reject)
        if (!reduced) scope.launch { offset.shake() }
        delay(InvalidHold)
        value = ""
        state = OtpAutofillState.Idle
        runCatching { focusRequester.requestFocus() }
    }
}

@Stable
class OtpAutofillScope internal constructor(
    column: ColumnScope,
    internal val controller: OtpAutofillController,
) : ColumnScope by column {
    val state: OtpAutofillState get() = controller.state

    val value: String get() = controller.value

    val maxLength: Int get() = controller.maxLength

    fun fill(code: String) = controller.fill(code)
}

@Composable
fun OtpAutofill(
    maxLength: Int,
    onVerify: suspend (String) -> Boolean,
    modifier: Modifier = Modifier,
    content: @Composable OtpAutofillScope.() -> Unit,
) {
    val coroutineScope = rememberCoroutineScope()
    val controller = remember { OtpAutofillController(coroutineScope) }
    val haptics = rememberHaptics()
    val reduced = formReducedMotion()
    SideEffect {
        controller.onVerify = onVerify
        controller.perform = haptics::perform
        controller.reduced = reduced
    }
    controller.maxLength = maxLength
    Column(
        modifier = modifier,
        verticalArrangement = Arrangement.spacedBy(16.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        val scope = remember(this, controller) { OtpAutofillScope(this, controller) }
        scope.content()
    }
}

@Composable
fun OtpAutofillScope.OtpAutofillInput(
    modifier: Modifier = Modifier,
    contentDescription: String? = null,
    autoFocus: Boolean = false,
    enabled: Boolean = true,
    content: (@Composable RowScope.() -> Unit)? = null,
) {
    val length = controller.maxLength
    val interaction = remember { MutableInteractionSource() }
    val focused by interaction.collectIsFocusedAsState()
    LaunchedEffect(focused) { controller.focused = focused }
    if (autoFocus) {
        LaunchedEffect(Unit) { runCatching { controller.focusRequester.requestFocus() } }
    }
    val tone = when (controller.state) {
        OtpAutofillState.Verifying -> OtpTone.Verifying
        OtpAutofillState.Verified -> OtpTone.Verified
        OtpAutofillState.Invalid -> OtpTone.Invalid
        else -> OtpTone.Default
    }
    CompositionLocalProvider(
        LocalOtpAppearance provides OtpAppearance(tone, pop = controller.state == OtpAutofillState.Filling),
    ) {
        InputOTP(
            value = controller.value,
            onValueChange = { if (!controller.locked) controller.type(it) },
            maxLength = controller.maxLength,
            modifier = modifier
                .graphicsLayer { translationX = controller.offset.value.dp.toPx() }
                .focusRequester(controller.focusRequester)
                .then(
                    if (contentDescription != null) {
                        Modifier.semantics { this.contentDescription = contentDescription }
                    } else {
                        Modifier
                    },
                ),
            enabled = enabled,
            invalid = controller.state == OtpAutofillState.Invalid,
            readOnly = controller.locked,
            interactionSource = interaction,
            content = content ?: {
                InputOTPGroup {
                    repeat(length) { InputOTPSlot(it) }
                }
            },
        )
    }
}

private class OtpAutofillSuggestionPosition(private val bottomLimit: Int) : PopupPositionProvider {
    override fun calculatePosition(
        anchorBounds: IntRect,
        windowSize: IntSize,
        layoutDirection: LayoutDirection,
        popupContentSize: IntSize,
    ): IntOffset = IntOffset(0, (if (bottomLimit == Int.MAX_VALUE) windowSize.height else bottomLimit) - popupContentSize.height)
}

@Composable
fun OtpAutofillScope.OtpAutofillSuggestion(
    code: String?,
    modifier: Modifier = Modifier,
    source: String = "From Messages",
) {
    val open = !code.isNullOrBlank() && controller.focused && controller.value.isEmpty() &&
        controller.state == OtpAutofillState.Idle
    val last = remember { arrayOf("") }
    if (!code.isNullOrBlank()) last[0] = code
    val shown = last[0]
    val transition = remember { MutableTransitionState(false) }
    transition.targetState = open
    if (!transition.currentState && !transition.targetState) return
    val colors = EsuissTheme.colors
    val density = LocalDensity.current
    val reduced = formReducedMotion()
    val container = LocalWindowInfo.current.containerSize
    val keyboard = WindowInsets.ime.getBottom(density)
    val navigation = WindowInsets.navigationBars.getBottom(density)
    val bottomLimit = if (container.height > 0) container.height - maxOf(keyboard, navigation) else Int.MAX_VALUE
    val provider = remember(bottomLimit) { OtpAutofillSuggestionPosition(bottomLimit) }
    val slide = with(density) { 8.dp.roundToPx() }
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    Popup(
        popupPositionProvider = provider,
        properties = PopupProperties(focusable = false, dismissOnBackPress = false, dismissOnClickOutside = false),
    ) {
        AnimatedVisibility(
            visibleState = transition,
            enter = if (reduced) {
                fadeIn(tween(300))
            } else {
                fadeIn(tween(300, easing = FormEasing)) + slideInVertically(tween(300, easing = FormEasing)) { slide }
            },
            exit = if (reduced) {
                fadeOut(tween(300))
            } else {
                fadeOut(tween(300, easing = FormEasing)) + slideOutVertically(tween(300, easing = FormEasing)) { slide }
            },
        ) {
            Column(
                modifier = modifier
                    .width(with(density) { container.width.toDp() })
                    .heightIn(min = 44.dp)
                    .background(colors.surfaceSecondary)
                    .background(if (pressed) colors.itemPressed else Color.Transparent)
                    .drawBehind { drawRect(colors.separator, Offset.Zero, Size(size.width, 1.dp.toPx())) }
                    .clickable(
                        interactionSource = interaction,
                        indication = null,
                        enabled = open,
                        role = Role.Button,
                    ) { if (shown.isNotBlank()) fill(shown) }
                    .padding(vertical = 6.dp),
                verticalArrangement = Arrangement.Center,
                horizontalAlignment = Alignment.CenterHorizontally,
            ) {
                BasicText(source, style = Typography.xs.copy(color = colors.labelSecondary))
                BasicText(
                    shown,
                    style = Typography.base.copy(
                        color = colors.label,
                        fontWeight = FontWeight.SemiBold,
                        letterSpacing = 0.05.em,
                        fontFeatureSettings = "tnum",
                    ),
                )
            }
        }
    }
}
```

4. Update the `com.esuiss.ui` package names to match your project.

## Usage

```tsx
import { VerifyCode } from "@/components/blocks/verify-code"
```

```tsx
<VerifyCode />
```

`onVerify` receives the code and returns a boolean or a promise; by default it accepts the demo code `482913`. `onHelp` handles the help link.