Message Scroller

import { ArrowUpIcon, ChecksIcon, XIcon } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Attachment, AttachmentAction, AttachmentActions, AttachmentContent, AttachmentDescription, AttachmentLabel, AttachmentMedia, AttachmentProgress, AttachmentTitle } from "@/components/ui/attachment"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import { BottomBar, BottomBarContent } from "@/components/ui/bottom-bar"
import { Bubble, BubbleContent, BubbleReactions } from "@/components/ui/bubble"
import { Icon } from "@/components/ui/icon"
import { InputGroup, InputGroupAddon, InputGroupButton, InputGroupInput } from "@/components/ui/input-group"
import { Message, MessageAvatar, MessageContent, MessageFooter, MessageHeader } from "@/components/ui/message"
import { MessageScroller, MessageScrollerButton, MessageScrollerItem, MessageScrollerProvider, MessageScrollerViewport, useMessageScroller } from "@/components/ui/message-scroller"
import { Text } from "@/components/ui/text"

type ChatMessage = {
  id: string
  from: "me" | "them"
  texts: string[]
  time?: string
  status?: string
  reaction?: string
  attachment?: { name: string; size: string; progress?: number }
}

const thread: ChatMessage[] = [
  {
    id: "1",
    from: "them",
    texts: ["Hey, do you have a minute?", "The client moved the launch."],
    time: "9:12 AM",
  },
  { id: "2", from: "me", texts: ["Sure, what's up?"] },
  {
    id: "3",
    from: "them",
    texts: ["It's Thursday now. Two days earlier than planned."],
    reaction: "😬 1",
  },
  {
    id: "4",
    from: "me",
    texts: [
      "We could ship onboarding behind a flag.",
      "Turn it on next week once QA is done.",
    ],
    status: "Read 9:15 AM",
  },
  {
    id: "5",
    from: "them",
    texts: ["Here are the release notes."],
    attachment: { name: "Release notes.pdf", size: "1.2 MB" },
    time: "9:18 AM",
  },
  {
    id: "6",
    from: "me",
    texts: ["And the checklist with my comments."],
    attachment: { name: "Checklist.pdf", size: "Uploading", progress: 64 },
  },
  {
    id: "7",
    from: "them",
    texts: ["Perfect. Let's sync tomorrow at ten."],
    reaction: "👍 2",
  },
  {
    id: "8",
    from: "me",
    texts: ["Sounds good, see you then."],
    status: "Delivered",
  },
]

function ChatRow({ message }: { message: ChatMessage }) {
  const mine = message.from === "me"
  return (
    <MessageScrollerItem>
      <Message align={mine ? "end" : "start"}>
        {mine ? null : (
          <MessageAvatar>
            <Avatar>
              <AvatarFallback>MK</AvatarFallback>
            </Avatar>
          </MessageAvatar>
        )}
        <MessageContent>
          {message.time && !mine ? (
            <MessageHeader>Maya · {message.time}</MessageHeader>
          ) : null}
          {message.attachment ? (
            <Attachment
              state={message.attachment.progress ? "uploading" : "done"}
              className="w-64"
            >
              <AttachmentMedia variant="document">
                <AttachmentLabel className="bg-red">pdf</AttachmentLabel>
              </AttachmentMedia>
              <AttachmentContent>
                <AttachmentTitle>{message.attachment.name}</AttachmentTitle>
                {message.attachment.progress ? (
                  <AttachmentProgress
                    value={message.attachment.progress}
                    accessibilityLabel="Uploading"
                  />
                ) : (
                  <AttachmentDescription>
                    {message.attachment.size}
                  </AttachmentDescription>
                )}
              </AttachmentContent>
              {message.attachment.progress ? (
                <AttachmentActions>
                  <AttachmentAction accessibilityLabel="Cancel upload">
                    <Icon as={XIcon} />
                  </AttachmentAction>
                </AttachmentActions>
              ) : null}
            </Attachment>
          ) : null}
          {message.texts.map((text, index) => (
            <Bubble key={text} variant={mine ? "default" : "muted"}>
              <BubbleContent>{text}</BubbleContent>
              {message.reaction && index === message.texts.length - 1 ? (
                <BubbleReactions align={mine ? "start" : "end"}>
                  {message.reaction}
                </BubbleReactions>
              ) : null}
            </Bubble>
          ))}
          {message.status ? (
            <MessageFooter className="gap-1">
              <Icon as={ChecksIcon} className="text-accent" />
              <Text>{message.status}</Text>
            </MessageFooter>
          ) : null}
        </MessageContent>
      </Message>
    </MessageScrollerItem>
  )
}

function Composer({ onSend }: { onSend: (text: string) => void }) {
  const [value, setValue] = React.useState("")
  const { scrollToEnd } = useMessageScroller()
  const send = () => {
    const text = value.trim()
    if (!text) return
    onSend(text)
    setValue("")
    requestAnimationFrame(() => scrollToEnd())
  }
  return (
    <BottomBar separator>
      <BottomBarContent>
        <InputGroup>
          <InputGroupInput
            placeholder="Message"
            value={value}
            onValueChange={setValue}
            returnKeyType="send"
            onSubmitEditing={send}
          />
          <InputGroupAddon align="inline-end">
            <InputGroupButton
              variant="default"
              size="icon-xs"
              accessibilityLabel="Send"
              disabled={!value.trim()}
              onPress={send}
            >
              <Icon as={ArrowUpIcon} />
            </InputGroupButton>
          </InputGroupAddon>
        </InputGroup>
      </BottomBarContent>
    </BottomBar>
  )
}

type ChatReady = (
  append: (messages: ChatMessage[]) => void,
  scroller: ReturnType<typeof useMessageScroller>
) => void

function ReadyEffect({
  append,
  onReady,
}: {
  append: (messages: ChatMessage[]) => void
  onReady?: ChatReady
}) {
  const scroller = useMessageScroller()
  const readyRef = React.useRef(onReady)
  const scrollerRef = React.useRef(scroller)

  React.useEffect(() => {
    readyRef.current?.(append, scrollerRef.current)
  }, [append])

  return null
}

function Chat({
  initial,
  empty,
  onReady,
}: {
  initial: ChatMessage[]
  empty?: React.ReactElement
  onReady?: ChatReady
}) {
  const [messages, setMessages] = React.useState(initial)
  const append = React.useCallback((next: ChatMessage[]) => {
    setMessages((current) => [...current, ...next])
  }, [])

  return (
    <MessageScrollerProvider>
      <ReadyEffect append={append} onReady={onReady} />
      <View className="-m-4 flex-1">
        <MessageScroller>
          <MessageScrollerViewport
            data={messages}
            keyExtractor={(message) => message.id}
            renderItem={({ item }) => <ChatRow message={item} />}
            contentContainerClassName="gap-4 py-4"
            ListEmptyComponent={empty}
          />
          <MessageScrollerButton />
        </MessageScroller>
        <Composer
          onSend={(text) =>
            append([{ id: `sent-${Date.now()}`, from: "me", texts: [text] }])
          }
        />
      </View>
    </MessageScrollerProvider>
  )
}

export function MessageScrollerExample() {
  return (
    <Chat initial={thread} />
  )
}

import EsuissUI
import PhosphorSwift
import SwiftUI

struct MessageScrollerExample: View {
  var body: some View {
    MessageScrollerChat(initial: MessageScrollerData.thread)
  }
}

struct MessageScrollerAttachment: Hashable {
  let name: String
  let size: String
  var progress: Double?
}

struct MessageScrollerMessage: Identifiable, Hashable {
  let id: String
  let fromMe: Bool
  let texts: [String]
  var time: String?
  var status: String?
  var reaction: String?
  var attachment: MessageScrollerAttachment?
}

enum MessageScrollerData {
  static let thread: [MessageScrollerMessage] = [
    MessageScrollerMessage(
      id: "1",
      fromMe: false,
      texts: ["Hey, do you have a minute?", "The client moved the launch."],
      time: "9:12 AM"
    ),
    MessageScrollerMessage(id: "2", fromMe: true, texts: ["Sure, what's up?"]),
    MessageScrollerMessage(
      id: "3",
      fromMe: false,
      texts: ["It's Thursday now. Two days earlier than planned."],
      reaction: "😬 1"
    ),
    MessageScrollerMessage(
      id: "4",
      fromMe: true,
      texts: ["We could ship onboarding behind a flag.", "Turn it on next week once QA is done."],
      status: "Read 9:15 AM"
    ),
    MessageScrollerMessage(
      id: "5",
      fromMe: false,
      texts: ["Here are the release notes."],
      time: "9:18 AM",
      attachment: MessageScrollerAttachment(name: "Release notes.pdf", size: "1.2 MB")
    ),
    MessageScrollerMessage(
      id: "6",
      fromMe: true,
      texts: ["And the checklist with my comments."],
      attachment: MessageScrollerAttachment(name: "Checklist.pdf", size: "Uploading", progress: 64)
    ),
    MessageScrollerMessage(
      id: "7",
      fromMe: false,
      texts: ["Perfect. Let's sync tomorrow at ten."],
      reaction: "👍 2"
    ),
    MessageScrollerMessage(id: "8", fromMe: true, texts: ["Sounds good, see you then."], status: "Delivered"),
  ]

  static let subjects = [
    "Did you see the latest build?",
    "The onboarding copy needs one more pass.",
    "I can take the release notes.",
    "QA found two small issues on Android.",
    "Both are fixed in the next build.",
    "Can we move the review to the afternoon?",
  ]

  static func long(_ count: Int, offset: Int = 0) -> [MessageScrollerMessage] {
    (0..<count).map { index in
      let number = index + offset
      return MessageScrollerMessage(
        id: "m\(number)",
        fromMe: number % 3 == 0,
        texts: [subjects[number % subjects.count]]
      )
    }
  }
}

struct MessageScrollerRow: View {
  let message: MessageScrollerMessage

  var body: some View {
    let mine = message.fromMe
    Message(align: mine ? .end : .start) {
      if !mine {
        MessageAvatar {
          Avatar { AvatarFallback("MK") }
        }
      }
      MessageContent {
        if let time = message.time, !mine {
          MessageHeader(verbatim: "Maya · \(time)")
        }
        if let attachment = message.attachment {
          MessageScrollerAttachmentView(attachment: attachment)
        }
        ForEach(Array(message.texts.enumerated()), id: \.offset) { index, text in
          Bubble(variant: mine ? .default : .muted) {
            BubbleContent(verbatim: text)
            if let reaction = message.reaction, index == message.texts.count - 1 {
              BubbleReactions(verbatim: reaction, align: mine ? .start : .end)
            }
          }
        }
        if let status = message.status {
          MessageFooter {
            Ph.checks.regular
              .frame(width: 16, height: 16)
              .foregroundStyle(Color.accent)
            Text(verbatim: status)
          }
        }
      }
    }
  }
}

struct MessageScrollerAttachmentView: View {
  let attachment: MessageScrollerAttachment

  var body: some View {
    Attachment(state: attachment.progress == nil ? .done : .uploading) {
      AttachmentMedia(.document) {
        AttachmentLabel("pdf", tint: .red)
      }
      AttachmentContent {
        AttachmentTitle(verbatim: attachment.name)
        if let progress = attachment.progress {
          AttachmentProgress(value: progress, label: "Uploading")
        } else {
          AttachmentDescription(verbatim: attachment.size)
        }
      }
      if attachment.progress != nil {
        AttachmentActions {
          AttachmentAction("Cancel upload", icon: Ph.x.bold) {}
        }
      }
    }
    .frame(width: 256)
  }
}

struct MessageScrollerChat: View {
  let unreadDemo: Bool

  @State private var messages: [MessageScrollerMessage]
  @State private var controller = MessageScrollerController()
  @State private var draft = ""

  init(initial: [MessageScrollerMessage], unreadDemo: Bool = false) {
    self.unreadDemo = unreadDemo
    _messages = State(initialValue: initial)
  }

  var body: some View {
    let ready = !draft.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
    VStack(spacing: 0) {
      MessageScroller(messages, spacing: 16, controller: controller) { message in
        MessageScrollerRow(message: message)
      }
      .overlay {
        if messages.isEmpty {
          Empty {
            EmptyHeader {
              EmptyMedia(.icon) { Ph.chatsCircle.regular }
              EmptyTitle("No messages yet")
              EmptyDescription("Say hello to start the conversation.")
            }
          }
        }
      }
      .frame(maxHeight: .infinity)
      BottomBar(separator: true) {
        BottomBarContent {
          InputGroup {
            InputGroupInput("Message", text: $draft)
              .submitLabel(.send)
              .onSubmit(send)
            InputGroupAddon(align: .inlineEnd) {
              InputGroupButton(variant: .default, size: .iconXs, action: send) {
                Ph.arrowUp.bold.frame(width: 14, height: 14)
              }
              .disabled(!ready)
              .accessibilityLabel(Text("Send"))
            }
          }
        }
      }
    }
    .task {
      guard unreadDemo else { return }
      try? await Task.sleep(for: .milliseconds(300))
      controller.scrollToStart(animated: false)
      try? await Task.sleep(for: .milliseconds(600))
      messages.append(contentsOf: [
        MessageScrollerMessage(id: "n1", fromMe: false, texts: ["Are you there?"]),
        MessageScrollerMessage(id: "n2", fromMe: false, texts: ["The build is green."]),
        MessageScrollerMessage(id: "n3", fromMe: false, texts: ["Merging now."]),
      ])
    }
  }

  func send() {
    let text = draft.trimmingCharacters(in: .whitespacesAndNewlines)
    guard !text.isEmpty else { return }
    messages.append(MessageScrollerMessage(id: "sent-\(UUID().uuidString)", fromMe: true, texts: [text]))
    draft = ""
    Task { @MainActor in
      controller.scrollToEnd()
    }
  }
}

let thread: [MessageScrollerMessage] = [
  MessageScrollerMessage(
    id: "1",
    fromMe: false,
    texts: ["Hey, do you have a minute?", "The client moved the launch."],
    time: "9:12 AM"
  ),
  MessageScrollerMessage(id: "2", fromMe: true, texts: ["Sure, what's up?"]),
  MessageScrollerMessage(
    id: "3",
    fromMe: false,
    texts: ["It's Thursday now. Two days earlier than planned."],
    reaction: "😬 1"
  ),
  MessageScrollerMessage(
    id: "4",
    fromMe: true,
    texts: ["We could ship onboarding behind a flag.", "Turn it on next week once QA is done."],
    status: "Read 9:15 AM"
  ),
  MessageScrollerMessage(
    id: "5",
    fromMe: false,
    texts: ["Here are the release notes."],
    time: "9:18 AM",
    attachment: MessageScrollerAttachment(name: "Release notes.pdf", size: "1.2 MB")
  ),
  MessageScrollerMessage(
    id: "6",
    fromMe: true,
    texts: ["And the checklist with my comments."],
    attachment: MessageScrollerAttachment(name: "Checklist.pdf", size: "Uploading", progress: 64)
  ),
  MessageScrollerMessage(
    id: "7",
    fromMe: false,
    texts: ["Perfect. Let's sync tomorrow at ten."],
    reaction: "👍 2"
  ),
  MessageScrollerMessage(id: "8", fromMe: true, texts: ["Sounds good, see you then."], status: "Delivered"),
]

let subjects = [
  "Did you see the latest build?",
  "The onboarding copy needs one more pass.",
  "I can take the release notes.",
  "QA found two small issues on Android.",
  "Both are fixed in the next build.",
  "Can we move the review to the afternoon?",
]

func long(_ count: Int, offset: Int = 0) -> [MessageScrollerMessage] {
  (0..<count).map { index in
    let number = index + offset
    return MessageScrollerMessage(
      id: "m\(number)",
      fromMe: number % 3 == 0,
      texts: [subjects[number % subjects.count]]
    )
  }
}

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.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.runtime.withFrameNanos
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.ArrowUp
import com.adamglin.phosphoricons.regular.ChatsCircle
import com.adamglin.phosphoricons.regular.Checks
import com.adamglin.phosphoricons.regular.X
import com.esuiss.ui.components.Attachment
import com.esuiss.ui.components.AttachmentAction
import com.esuiss.ui.components.AttachmentActions
import com.esuiss.ui.components.AttachmentContent
import com.esuiss.ui.components.AttachmentDescription
import com.esuiss.ui.components.AttachmentLabel
import com.esuiss.ui.components.AttachmentMedia
import com.esuiss.ui.components.AttachmentMediaVariant
import com.esuiss.ui.components.AttachmentProgress
import com.esuiss.ui.components.AttachmentState
import com.esuiss.ui.components.AttachmentTitle
import com.esuiss.ui.components.Avatar
import com.esuiss.ui.components.AvatarFallback
import com.esuiss.ui.components.BottomBar
import com.esuiss.ui.components.BottomBarContent
import com.esuiss.ui.components.Bubble
import com.esuiss.ui.components.BubbleAlign
import com.esuiss.ui.components.BubbleContent
import com.esuiss.ui.components.BubbleReactions
import com.esuiss.ui.components.BubbleVariant
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Empty
import com.esuiss.ui.components.EmptyDescription
import com.esuiss.ui.components.EmptyHeader
import com.esuiss.ui.components.EmptyMedia
import com.esuiss.ui.components.EmptyMediaVariant
import com.esuiss.ui.components.EmptyTitle
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.InputGroup
import com.esuiss.ui.components.InputGroupAddon
import com.esuiss.ui.components.InputGroupAddonAlign
import com.esuiss.ui.components.InputGroupButton
import com.esuiss.ui.components.InputGroupButtonSize
import com.esuiss.ui.components.InputGroupInput
import com.esuiss.ui.components.Message
import com.esuiss.ui.components.MessageAlign
import com.esuiss.ui.components.MessageAvatar
import com.esuiss.ui.components.MessageContent
import com.esuiss.ui.components.MessageFooter
import com.esuiss.ui.components.MessageHeader
import com.esuiss.ui.components.MessageScroller
import com.esuiss.ui.components.MessageScrollerState
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.ScreenEdge
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.rememberMessageScrollerState
import com.esuiss.ui.theme.EsuissTheme
import kotlinx.coroutines.launch

@Composable
fun MessageScrollerExample() {
    MessageScrollerChat(messageScrollerThread)
}

class MessageScrollerFile(val name: String, val size: String, val progress: Float? = null)

class MessageScrollerMessage(
    val id: String,
    val mine: Boolean,
    val texts: List<String>,
    val time: String? = null,
    val status: String? = null,
    val reaction: String? = null,
    val attachment: MessageScrollerFile? = null,
)

val messageScrollerThread = listOf(
    MessageScrollerMessage("1", false, listOf("Hey, do you have a minute?", "The client moved the launch."), time = "9:12 AM"),
    MessageScrollerMessage("2", true, listOf("Sure, what's up?")),
    MessageScrollerMessage("3", false, listOf("It's Thursday now. Two days earlier than planned."), reaction = "😬 1"),
    MessageScrollerMessage(
        "4",
        true,
        listOf("We could ship onboarding behind a flag.", "Turn it on next week once QA is done."),
        status = "Read 9:15 AM",
    ),
    MessageScrollerMessage(
        "5",
        false,
        listOf("Here are the release notes."),
        time = "9:18 AM",
        attachment = MessageScrollerFile("Release notes.pdf", "1.2 MB"),
    ),
    MessageScrollerMessage(
        "6",
        true,
        listOf("And the checklist with my comments."),
        attachment = MessageScrollerFile("Checklist.pdf", "Uploading", 64f),
    ),
    MessageScrollerMessage("7", false, listOf("Perfect. Let's sync tomorrow at ten."), reaction = "👍 2"),
    MessageScrollerMessage("8", true, listOf("Sounds good, see you then."), status = "Delivered"),
)

@Composable
fun MessageScrollerRow(message: MessageScrollerMessage) {
    val colors = EsuissTheme.colors
    val mine = message.mine
    Message(Modifier.fillMaxWidth(), align = if (mine) MessageAlign.End else MessageAlign.Start) {
        if (!mine) {
            MessageAvatar {
                Avatar(fallback = { AvatarFallback("MK") })
            }
        }
        MessageContent {
            if (message.time != null && !mine) MessageHeader("Maya · ${message.time}")
            val file = message.attachment
            if (file != null) {
                Attachment(
                    Modifier.width(256.dp),
                    state = if (file.progress != null) AttachmentState.Uploading else AttachmentState.Done,
                ) {
                    AttachmentMedia(variant = AttachmentMediaVariant.Document) {
                        AttachmentLabel("pdf", background = colors.red)
                    }
                    AttachmentContent {
                        AttachmentTitle(file.name)
                        if (file.progress != null) {
                            AttachmentProgress(file.progress, contentDescription = "Uploading")
                        } else {
                            AttachmentDescription(file.size)
                        }
                    }
                    if (file.progress != null) {
                        AttachmentActions {
                            AttachmentAction(onClick = {}, contentDescription = "Cancel upload") {
                                Icon(PhosphorIcons.Regular.X, contentDescription = null)
                            }
                        }
                    }
                }
            }
            message.texts.forEachIndexed { index, text ->
                Bubble(variant = if (mine) BubbleVariant.Default else BubbleVariant.Muted) {
                    BubbleContent(text)
                    if (message.reaction != null && index == message.texts.lastIndex) {
                        BubbleReactions(message.reaction, align = if (mine) BubbleAlign.Start else BubbleAlign.End)
                    }
                }
            }
            if (message.status != null) {
                MessageFooter {
                    Icon(PhosphorIcons.Regular.Checks, contentDescription = null, tint = colors.accent)
                    Text(message.status)
                }
            }
        }
    }
}

@Composable
fun MessageScrollerComposer(state: MessageScrollerState, onSend: (String) -> Unit) {
    var value by rememberSaveable { mutableStateOf("") }
    val scope = rememberCoroutineScope()
    val send = {
        val text = value.trim()
        if (text.isNotEmpty()) {
            onSend(text)
            value = ""
            scope.launch {
                withFrameNanos { }
                state.scrollToEnd()
            }
        }
    }
    BottomBar(separator = true) {
        BottomBarContent {
            InputGroup {
                InputGroupInput(
                    value,
                    { value = it },
                    placeholder = "Message",
                    keyboardOptions = KeyboardOptions(imeAction = ImeAction.Send),
                    keyboardActions = KeyboardActions(onSend = { send() }),
                )
                InputGroupAddon(align = InputGroupAddonAlign.InlineEnd) {
                    InputGroupButton(
                        onClick = { send() },
                        modifier = Modifier.semantics { contentDescription = "Send" },
                        size = InputGroupButtonSize.IconXs,
                        variant = ButtonVariant.Default,
                        enabled = value.isNotBlank(),
                    ) {
                        Icon(PhosphorIcons.Regular.ArrowUp, contentDescription = null)
                    }
                }
            }
        }
    }
}

@Composable
fun MessageScrollerEmpty(modifier: Modifier) {
    Empty(modifier) {
        EmptyHeader {
            EmptyMedia(variant = EmptyMediaVariant.Icon) {
                Icon(PhosphorIcons.Regular.ChatsCircle, contentDescription = null)
            }
            EmptyTitle("No messages yet")
            EmptyDescription("Say hello to start the conversation.")
        }
    }
}

@Composable
fun MessageScrollerFrame(
    edges: Set<ScreenEdge> = setOf(ScreenEdge.Top, ScreenEdge.Left, ScreenEdge.Right),
    content: @Composable ColumnScope.() -> Unit,
) {
    Screen(edges = edges) {
        Column(Modifier.fillMaxSize()) {
            content()
        }
    }
}

@Composable
fun MessageScrollerList(
    messages: List<MessageScrollerMessage>,
    state: MessageScrollerState,
    modifier: Modifier,
    onLoadOlder: (() -> Unit)? = null,
    loadingOlder: Boolean = false,
) {
    MessageScroller(
        items = messages,
        key = { it.id },
        modifier = modifier,
        state = state,
        onLoadOlder = onLoadOlder,
        loadingOlder = loadingOlder,
        contentPadding = PaddingValues(16.dp),
        verticalArrangement = Arrangement.spacedBy(16.dp, Alignment.Bottom),
    ) { message ->
        MessageScrollerRow(message)
    }
}

@Composable
fun MessageScrollerChat(
    initial: List<MessageScrollerMessage>,
    showEmpty: Boolean = false,
    onReady: (suspend (append: (List<MessageScrollerMessage>) -> Unit, state: MessageScrollerState) -> Unit)? = null,
) {
    var messages by remember { mutableStateOf(initial) }
    val state = rememberMessageScrollerState()
    val append: (List<MessageScrollerMessage>) -> Unit = { next -> messages = messages + next }
    if (onReady != null) {
        LaunchedEffect(Unit) { onReady(append, state) }
    }
    MessageScrollerFrame {
        Box(Modifier.weight(1f).fillMaxWidth()) {
            MessageScrollerList(messages, state, Modifier.fillMaxSize())
            if (showEmpty && messages.isEmpty()) {
                MessageScrollerEmpty(Modifier.align(Alignment.Center))
            }
        }
        MessageScrollerComposer(state) { text ->
            append(listOf(MessageScrollerMessage("sent-${System.currentTimeMillis()}", true, listOf(text))))
        }
    }
}

import { cn } from "cn"
import { ArrowDownIcon, ArrowUpIcon } from "phosphor-react-native"
import * as React from "react"
import {
  FlatList,
  type FlatListProps,
  Platform,
  View,
  type ViewProps,
  type ViewToken,
} from "react-native"
import {
  Easing,
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,

import { cn } from "cn"
import { ArrowDownIcon, ArrowUpIcon } from "phosphor-react-native"
import * as React from "react"
import {
  FlatList,
  type FlatListProps,
  Platform,
  View,
  type ViewProps,
  type ViewToken,
} from "react-native"
import {
  Easing,
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,

import { ArrowDownIcon, ArrowUpIcon } from "phosphor-react-native"
import * as React from "react"
import {
  FlatList,
  type FlatListProps,
  Platform,
  StyleSheet,
  View,
  type ViewProps,
  type ViewToken,
} from "react-native"
import {
  Easing,
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,

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
  }

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))

import PhosphorSwift
import SwiftUI

public enum MessageScrollerDefaultScrollPosition: CaseIterable, Sendable {
  case start, end
}

public enum MessageScrollerScrollDirection: CaseIterable, Sendable, Hashable {
  case start, end
}

struct MessageScrollerChange: Equatable {
  var appended = 0
  var prepended = 0
  var reset = false
}

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

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,

package com.esuiss.ui.components

import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
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.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.defaultMinSize
import androidx.compose.foundation.layout.fillMaxSize

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

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

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 }

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

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,

package com.esuiss.ui.components

import androidx.compose.animation.core.LinearEasing
import androidx.compose.animation.core.RepeatMode
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.infiniteRepeatable
import androidx.compose.animation.core.rememberInfiniteTransition
import androidx.compose.animation.core.tween
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.size
import androidx.compose.runtime.Composable
import androidx.compose.runtime.State
import androidx.compose.runtime.remember
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.CornerRadius

import { ArrowUpIcon, ChecksIcon, XIcon } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Attachment, AttachmentAction, AttachmentActions, AttachmentContent, AttachmentDescription, AttachmentLabel, AttachmentMedia, AttachmentProgress, AttachmentTitle } from "@/components/ui/attachment"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import { BottomBar, BottomBarContent } from "@/components/ui/bottom-bar"
import { Bubble, BubbleContent, BubbleReactions } from "@/components/ui/bubble"
import { Icon } from "@/components/ui/icon"
import { InputGroup, InputGroupAddon, InputGroupButton, InputGroupInput } from "@/components/ui/input-group"
import { Message, MessageAvatar, MessageContent, MessageFooter, MessageHeader } from "@/components/ui/message"
import { MessageScroller, MessageScrollerButton, MessageScrollerItem, MessageScrollerProvider, MessageScrollerViewport, useMessageScroller } from "@/components/ui/message-scroller"
import { Text } from "@/components/ui/text"

type ChatMessage = {
  id: string
  from: "me" | "them"
  texts: string[]
  time?: string
  status?: string
  reaction?: string
  attachment?: { name: string; size: string; progress?: number }
}

const subjects = [
  "Did you see the latest build?",
  "The onboarding copy needs one more pass.",
  "I can take the release notes.",
  "QA found two small issues on Android.",
  "Both are fixed in the next build.",
  "Can we move the review to the afternoon?",
]

function longThread(count: number, offset = 0): ChatMessage[] {
  return Array.from({ length: count }, (_, index) => {
    const number = index + offset
    return {
      id: `m${number}`,
      from: number % 3 === 0 ? "me" : "them",
      texts: [subjects[number % subjects.length]],
    }
  })
}

function ChatRow({ message }: { message: ChatMessage }) {
  const mine = message.from === "me"
  return (
    <MessageScrollerItem>
      <Message align={mine ? "end" : "start"}>
        {mine ? null : (
          <MessageAvatar>
            <Avatar>
              <AvatarFallback>MK</AvatarFallback>
            </Avatar>
          </MessageAvatar>
        )}
        <MessageContent>
          {message.time && !mine ? (
            <MessageHeader>Maya · {message.time}</MessageHeader>
          ) : null}
          {message.attachment ? (
            <Attachment
              state={message.attachment.progress ? "uploading" : "done"}
              className="w-64"
            >
              <AttachmentMedia variant="document">
                <AttachmentLabel className="bg-red">pdf</AttachmentLabel>
              </AttachmentMedia>
              <AttachmentContent>
                <AttachmentTitle>{message.attachment.name}</AttachmentTitle>
                {message.attachment.progress ? (
                  <AttachmentProgress
                    value={message.attachment.progress}
                    accessibilityLabel="Uploading"
                  />
                ) : (
                  <AttachmentDescription>
                    {message.attachment.size}
                  </AttachmentDescription>
                )}
              </AttachmentContent>
              {message.attachment.progress ? (
                <AttachmentActions>
                  <AttachmentAction accessibilityLabel="Cancel upload">
                    <Icon as={XIcon} />
                  </AttachmentAction>
                </AttachmentActions>
              ) : null}
            </Attachment>
          ) : null}
          {message.texts.map((text, index) => (
            <Bubble key={text} variant={mine ? "default" : "muted"}>
              <BubbleContent>{text}</BubbleContent>
              {message.reaction && index === message.texts.length - 1 ? (
                <BubbleReactions align={mine ? "start" : "end"}>
                  {message.reaction}
                </BubbleReactions>
              ) : null}
            </Bubble>
          ))}
          {message.status ? (
            <MessageFooter className="gap-1">
              <Icon as={ChecksIcon} className="text-accent" />
              <Text>{message.status}</Text>
            </MessageFooter>
          ) : null}
        </MessageContent>
      </Message>
    </MessageScrollerItem>
  )
}

function Composer({ onSend }: { onSend: (text: string) => void }) {
  const [value, setValue] = React.useState("")
  const { scrollToEnd } = useMessageScroller()
  const send = () => {
    const text = value.trim()
    if (!text) return
    onSend(text)
    setValue("")
    requestAnimationFrame(() => scrollToEnd())
  }
  return (
    <BottomBar separator>
      <BottomBarContent>
        <InputGroup>
          <InputGroupInput
            placeholder="Message"
            value={value}
            onValueChange={setValue}
            returnKeyType="send"
            onSubmitEditing={send}
          />
          <InputGroupAddon align="inline-end">
            <InputGroupButton
              variant="default"
              size="icon-xs"
              accessibilityLabel="Send"
              disabled={!value.trim()}
              onPress={send}
            >
              <Icon as={ArrowUpIcon} />
            </InputGroupButton>
          </InputGroupAddon>
        </InputGroup>
      </BottomBarContent>
    </BottomBar>
  )
}

type ChatReady = (
  append: (messages: ChatMessage[]) => void,
  scroller: ReturnType<typeof useMessageScroller>
) => void

function ReadyEffect({
  append,
  onReady,
}: {
  append: (messages: ChatMessage[]) => void
  onReady?: ChatReady
}) {
  const scroller = useMessageScroller()
  const readyRef = React.useRef(onReady)
  const scrollerRef = React.useRef(scroller)

  React.useEffect(() => {
    readyRef.current?.(append, scrollerRef.current)
  }, [append])

  return null
}

function Chat({
  initial,
  empty,
  onReady,
}: {
  initial: ChatMessage[]
  empty?: React.ReactElement
  onReady?: ChatReady
}) {
  const [messages, setMessages] = React.useState(initial)
  const append = React.useCallback((next: ChatMessage[]) => {
    setMessages((current) => [...current, ...next])
  }, [])

  return (
    <MessageScrollerProvider>
      <ReadyEffect append={append} onReady={onReady} />
      <View className="-m-4 flex-1">
        <MessageScroller>
          <MessageScrollerViewport
            data={messages}
            keyExtractor={(message) => message.id}
            renderItem={({ item }) => <ChatRow message={item} />}
            contentContainerClassName="gap-4 py-4"
            ListEmptyComponent={empty}
          />
          <MessageScrollerButton />
        </MessageScroller>
        <Composer
          onSend={(text) =>
            append([{ id: `sent-${Date.now()}`, from: "me", texts: [text] }])
          }
        />
      </View>
    </MessageScrollerProvider>
  )
}

export function MessageScrollerUnreadWhileScrolledUpExample() {
  return (
    <Chat
      initial={longThread(40)}
      onReady={(append, scroller) => {
        setTimeout(() => scroller.scrollToStart({ animated: false }), 300)
        setTimeout(
          () =>
            append([
              { id: "n1", from: "them", texts: ["Are you there?"] },
              { id: "n2", from: "them", texts: ["The build is green."] },
              { id: "n3", from: "them", texts: ["Merging now."] },
            ]),
          900
        )
      }}
    />
  )
}

import EsuissUI
import PhosphorSwift
import SwiftUI

struct MessageScrollerUnreadWhileScrolledUpExample: View {
  var body: some View {
    MessageScrollerChat(initial: MessageScrollerData.long(40), unreadDemo: true)
  }
}

struct MessageScrollerAttachment: Hashable {
  let name: String
  let size: String
  var progress: Double?
}

struct MessageScrollerMessage: Identifiable, Hashable {
  let id: String
  let fromMe: Bool
  let texts: [String]
  var time: String?
  var status: String?
  var reaction: String?
  var attachment: MessageScrollerAttachment?
}

enum MessageScrollerData {
  static let thread: [MessageScrollerMessage] = [
    MessageScrollerMessage(
      id: "1",
      fromMe: false,
      texts: ["Hey, do you have a minute?", "The client moved the launch."],
      time: "9:12 AM"
    ),
    MessageScrollerMessage(id: "2", fromMe: true, texts: ["Sure, what's up?"]),
    MessageScrollerMessage(
      id: "3",
      fromMe: false,
      texts: ["It's Thursday now. Two days earlier than planned."],
      reaction: "😬 1"
    ),
    MessageScrollerMessage(
      id: "4",
      fromMe: true,
      texts: ["We could ship onboarding behind a flag.", "Turn it on next week once QA is done."],
      status: "Read 9:15 AM"
    ),
    MessageScrollerMessage(
      id: "5",
      fromMe: false,
      texts: ["Here are the release notes."],
      time: "9:18 AM",
      attachment: MessageScrollerAttachment(name: "Release notes.pdf", size: "1.2 MB")
    ),
    MessageScrollerMessage(
      id: "6",
      fromMe: true,
      texts: ["And the checklist with my comments."],
      attachment: MessageScrollerAttachment(name: "Checklist.pdf", size: "Uploading", progress: 64)
    ),
    MessageScrollerMessage(
      id: "7",
      fromMe: false,
      texts: ["Perfect. Let's sync tomorrow at ten."],
      reaction: "👍 2"
    ),
    MessageScrollerMessage(id: "8", fromMe: true, texts: ["Sounds good, see you then."], status: "Delivered"),
  ]

  static let subjects = [
    "Did you see the latest build?",
    "The onboarding copy needs one more pass.",
    "I can take the release notes.",
    "QA found two small issues on Android.",
    "Both are fixed in the next build.",
    "Can we move the review to the afternoon?",
  ]

  static func long(_ count: Int, offset: Int = 0) -> [MessageScrollerMessage] {
    (0..<count).map { index in
      let number = index + offset
      return MessageScrollerMessage(
        id: "m\(number)",
        fromMe: number % 3 == 0,
        texts: [subjects[number % subjects.count]]
      )
    }
  }
}

struct MessageScrollerRow: View {
  let message: MessageScrollerMessage

  var body: some View {
    let mine = message.fromMe
    Message(align: mine ? .end : .start) {
      if !mine {
        MessageAvatar {
          Avatar { AvatarFallback("MK") }
        }
      }
      MessageContent {
        if let time = message.time, !mine {
          MessageHeader(verbatim: "Maya · \(time)")
        }
        if let attachment = message.attachment {
          MessageScrollerAttachmentView(attachment: attachment)
        }
        ForEach(Array(message.texts.enumerated()), id: \.offset) { index, text in
          Bubble(variant: mine ? .default : .muted) {
            BubbleContent(verbatim: text)
            if let reaction = message.reaction, index == message.texts.count - 1 {
              BubbleReactions(verbatim: reaction, align: mine ? .start : .end)
            }
          }
        }
        if let status = message.status {
          MessageFooter {
            Ph.checks.regular
              .frame(width: 16, height: 16)
              .foregroundStyle(Color.accent)
            Text(verbatim: status)
          }
        }
      }
    }
  }
}

struct MessageScrollerAttachmentView: View {
  let attachment: MessageScrollerAttachment

  var body: some View {
    Attachment(state: attachment.progress == nil ? .done : .uploading) {
      AttachmentMedia(.document) {
        AttachmentLabel("pdf", tint: .red)
      }
      AttachmentContent {
        AttachmentTitle(verbatim: attachment.name)
        if let progress = attachment.progress {
          AttachmentProgress(value: progress, label: "Uploading")
        } else {
          AttachmentDescription(verbatim: attachment.size)
        }
      }
      if attachment.progress != nil {
        AttachmentActions {
          AttachmentAction("Cancel upload", icon: Ph.x.bold) {}
        }
      }
    }
    .frame(width: 256)
  }
}

struct MessageScrollerChat: View {
  let unreadDemo: Bool

  @State private var messages: [MessageScrollerMessage]
  @State private var controller = MessageScrollerController()
  @State private var draft = ""

  init(initial: [MessageScrollerMessage], unreadDemo: Bool = false) {
    self.unreadDemo = unreadDemo
    _messages = State(initialValue: initial)
  }

  var body: some View {
    let ready = !draft.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
    VStack(spacing: 0) {
      MessageScroller(messages, spacing: 16, controller: controller) { message in
        MessageScrollerRow(message: message)
      }
      .overlay {
        if messages.isEmpty {
          Empty {
            EmptyHeader {
              EmptyMedia(.icon) { Ph.chatsCircle.regular }
              EmptyTitle("No messages yet")
              EmptyDescription("Say hello to start the conversation.")
            }
          }
        }
      }
      .frame(maxHeight: .infinity)
      BottomBar(separator: true) {
        BottomBarContent {
          InputGroup {
            InputGroupInput("Message", text: $draft)
              .submitLabel(.send)
              .onSubmit(send)
            InputGroupAddon(align: .inlineEnd) {
              InputGroupButton(variant: .default, size: .iconXs, action: send) {
                Ph.arrowUp.bold.frame(width: 14, height: 14)
              }
              .disabled(!ready)
              .accessibilityLabel(Text("Send"))
            }
          }
        }
      }
    }
    .task {
      guard unreadDemo else { return }
      try? await Task.sleep(for: .milliseconds(300))
      controller.scrollToStart(animated: false)
      try? await Task.sleep(for: .milliseconds(600))
      messages.append(contentsOf: [
        MessageScrollerMessage(id: "n1", fromMe: false, texts: ["Are you there?"]),
        MessageScrollerMessage(id: "n2", fromMe: false, texts: ["The build is green."]),
        MessageScrollerMessage(id: "n3", fromMe: false, texts: ["Merging now."]),
      ])
    }
  }

  func send() {
    let text = draft.trimmingCharacters(in: .whitespacesAndNewlines)
    guard !text.isEmpty else { return }
    messages.append(MessageScrollerMessage(id: "sent-\(UUID().uuidString)", fromMe: true, texts: [text]))
    draft = ""
    Task { @MainActor in
      controller.scrollToEnd()
    }
  }
}

let thread: [MessageScrollerMessage] = [
  MessageScrollerMessage(
    id: "1",
    fromMe: false,
    texts: ["Hey, do you have a minute?", "The client moved the launch."],
    time: "9:12 AM"
  ),
  MessageScrollerMessage(id: "2", fromMe: true, texts: ["Sure, what's up?"]),
  MessageScrollerMessage(
    id: "3",
    fromMe: false,
    texts: ["It's Thursday now. Two days earlier than planned."],
    reaction: "😬 1"
  ),
  MessageScrollerMessage(
    id: "4",
    fromMe: true,
    texts: ["We could ship onboarding behind a flag.", "Turn it on next week once QA is done."],
    status: "Read 9:15 AM"
  ),
  MessageScrollerMessage(
    id: "5",
    fromMe: false,
    texts: ["Here are the release notes."],
    time: "9:18 AM",
    attachment: MessageScrollerAttachment(name: "Release notes.pdf", size: "1.2 MB")
  ),
  MessageScrollerMessage(
    id: "6",
    fromMe: true,
    texts: ["And the checklist with my comments."],
    attachment: MessageScrollerAttachment(name: "Checklist.pdf", size: "Uploading", progress: 64)
  ),
  MessageScrollerMessage(
    id: "7",
    fromMe: false,
    texts: ["Perfect. Let's sync tomorrow at ten."],
    reaction: "👍 2"
  ),
  MessageScrollerMessage(id: "8", fromMe: true, texts: ["Sounds good, see you then."], status: "Delivered"),
]

let subjects = [
  "Did you see the latest build?",
  "The onboarding copy needs one more pass.",
  "I can take the release notes.",
  "QA found two small issues on Android.",
  "Both are fixed in the next build.",
  "Can we move the review to the afternoon?",
]

func long(_ count: Int, offset: Int = 0) -> [MessageScrollerMessage] {
  (0..<count).map { index in
    let number = index + offset
    return MessageScrollerMessage(
      id: "m\(number)",
      fromMe: number % 3 == 0,
      texts: [subjects[number % subjects.count]]
    )
  }
}

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.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.runtime.withFrameNanos
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.ArrowUp
import com.adamglin.phosphoricons.regular.ChatsCircle
import com.adamglin.phosphoricons.regular.Checks
import com.adamglin.phosphoricons.regular.X
import com.esuiss.ui.components.Attachment
import com.esuiss.ui.components.AttachmentAction
import com.esuiss.ui.components.AttachmentActions
import com.esuiss.ui.components.AttachmentContent
import com.esuiss.ui.components.AttachmentDescription
import com.esuiss.ui.components.AttachmentLabel
import com.esuiss.ui.components.AttachmentMedia
import com.esuiss.ui.components.AttachmentMediaVariant
import com.esuiss.ui.components.AttachmentProgress
import com.esuiss.ui.components.AttachmentState
import com.esuiss.ui.components.AttachmentTitle
import com.esuiss.ui.components.Avatar
import com.esuiss.ui.components.AvatarFallback
import com.esuiss.ui.components.BottomBar
import com.esuiss.ui.components.BottomBarContent
import com.esuiss.ui.components.Bubble
import com.esuiss.ui.components.BubbleAlign
import com.esuiss.ui.components.BubbleContent
import com.esuiss.ui.components.BubbleReactions
import com.esuiss.ui.components.BubbleVariant
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Empty
import com.esuiss.ui.components.EmptyDescription
import com.esuiss.ui.components.EmptyHeader
import com.esuiss.ui.components.EmptyMedia
import com.esuiss.ui.components.EmptyMediaVariant
import com.esuiss.ui.components.EmptyTitle
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.InputGroup
import com.esuiss.ui.components.InputGroupAddon
import com.esuiss.ui.components.InputGroupAddonAlign
import com.esuiss.ui.components.InputGroupButton
import com.esuiss.ui.components.InputGroupButtonSize
import com.esuiss.ui.components.InputGroupInput
import com.esuiss.ui.components.Message
import com.esuiss.ui.components.MessageAlign
import com.esuiss.ui.components.MessageAvatar
import com.esuiss.ui.components.MessageContent
import com.esuiss.ui.components.MessageFooter
import com.esuiss.ui.components.MessageHeader
import com.esuiss.ui.components.MessageScroller
import com.esuiss.ui.components.MessageScrollerState
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.ScreenEdge
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.rememberMessageScrollerState
import com.esuiss.ui.theme.EsuissTheme
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

class MessageScrollerFile(val name: String, val size: String, val progress: Float? = null)

class MessageScrollerMessage(
    val id: String,
    val mine: Boolean,
    val texts: List<String>,
    val time: String? = null,
    val status: String? = null,
    val reaction: String? = null,
    val attachment: MessageScrollerFile? = null,
)

val messageScrollerSubjects = listOf(
    "Did you see the latest build?",
    "The onboarding copy needs one more pass.",
    "I can take the release notes.",
    "QA found two small issues on Android.",
    "Both are fixed in the next build.",
    "Can we move the review to the afternoon?",
)

fun messageScrollerLongThread(count: Int, offset: Int = 0): List<MessageScrollerMessage> =
    List(count) { index ->
        val number = index + offset
        MessageScrollerMessage("m$number", number % 3 == 0, listOf(messageScrollerSubjects[number % messageScrollerSubjects.size]))
    }

@Composable
fun MessageScrollerRow(message: MessageScrollerMessage) {
    val colors = EsuissTheme.colors
    val mine = message.mine
    Message(Modifier.fillMaxWidth(), align = if (mine) MessageAlign.End else MessageAlign.Start) {
        if (!mine) {
            MessageAvatar {
                Avatar(fallback = { AvatarFallback("MK") })
            }
        }
        MessageContent {
            if (message.time != null && !mine) MessageHeader("Maya · ${message.time}")
            val file = message.attachment
            if (file != null) {
                Attachment(
                    Modifier.width(256.dp),
                    state = if (file.progress != null) AttachmentState.Uploading else AttachmentState.Done,
                ) {
                    AttachmentMedia(variant = AttachmentMediaVariant.Document) {
                        AttachmentLabel("pdf", background = colors.red)
                    }
                    AttachmentContent {
                        AttachmentTitle(file.name)
                        if (file.progress != null) {
                            AttachmentProgress(file.progress, contentDescription = "Uploading")
                        } else {
                            AttachmentDescription(file.size)
                        }
                    }
                    if (file.progress != null) {
                        AttachmentActions {
                            AttachmentAction(onClick = {}, contentDescription = "Cancel upload") {
                                Icon(PhosphorIcons.Regular.X, contentDescription = null)
                            }
                        }
                    }
                }
            }
            message.texts.forEachIndexed { index, text ->
                Bubble(variant = if (mine) BubbleVariant.Default else BubbleVariant.Muted) {
                    BubbleContent(text)
                    if (message.reaction != null && index == message.texts.lastIndex) {
                        BubbleReactions(message.reaction, align = if (mine) BubbleAlign.Start else BubbleAlign.End)
                    }
                }
            }
            if (message.status != null) {
                MessageFooter {
                    Icon(PhosphorIcons.Regular.Checks, contentDescription = null, tint = colors.accent)
                    Text(message.status)
                }
            }
        }
    }
}

@Composable
fun MessageScrollerComposer(state: MessageScrollerState, onSend: (String) -> Unit) {
    var value by rememberSaveable { mutableStateOf("") }
    val scope = rememberCoroutineScope()
    val send = {
        val text = value.trim()
        if (text.isNotEmpty()) {
            onSend(text)
            value = ""
            scope.launch {
                withFrameNanos { }
                state.scrollToEnd()
            }
        }
    }
    BottomBar(separator = true) {
        BottomBarContent {
            InputGroup {
                InputGroupInput(
                    value,
                    { value = it },
                    placeholder = "Message",
                    keyboardOptions = KeyboardOptions(imeAction = ImeAction.Send),
                    keyboardActions = KeyboardActions(onSend = { send() }),
                )
                InputGroupAddon(align = InputGroupAddonAlign.InlineEnd) {
                    InputGroupButton(
                        onClick = { send() },
                        modifier = Modifier.semantics { contentDescription = "Send" },
                        size = InputGroupButtonSize.IconXs,
                        variant = ButtonVariant.Default,
                        enabled = value.isNotBlank(),
                    ) {
                        Icon(PhosphorIcons.Regular.ArrowUp, contentDescription = null)
                    }
                }
            }
        }
    }
}

@Composable
fun MessageScrollerEmpty(modifier: Modifier) {
    Empty(modifier) {
        EmptyHeader {
            EmptyMedia(variant = EmptyMediaVariant.Icon) {
                Icon(PhosphorIcons.Regular.ChatsCircle, contentDescription = null)
            }
            EmptyTitle("No messages yet")
            EmptyDescription("Say hello to start the conversation.")
        }
    }
}

@Composable
fun MessageScrollerFrame(
    edges: Set<ScreenEdge> = setOf(ScreenEdge.Top, ScreenEdge.Left, ScreenEdge.Right),
    content: @Composable ColumnScope.() -> Unit,
) {
    Screen(edges = edges) {
        Column(Modifier.fillMaxSize()) {
            content()
        }
    }
}

@Composable
fun MessageScrollerList(
    messages: List<MessageScrollerMessage>,
    state: MessageScrollerState,
    modifier: Modifier,
    onLoadOlder: (() -> Unit)? = null,
    loadingOlder: Boolean = false,
) {
    MessageScroller(
        items = messages,
        key = { it.id },
        modifier = modifier,
        state = state,
        onLoadOlder = onLoadOlder,
        loadingOlder = loadingOlder,
        contentPadding = PaddingValues(16.dp),
        verticalArrangement = Arrangement.spacedBy(16.dp, Alignment.Bottom),
    ) { message ->
        MessageScrollerRow(message)
    }
}

@Composable
fun MessageScrollerChat(
    initial: List<MessageScrollerMessage>,
    showEmpty: Boolean = false,
    onReady: (suspend (append: (List<MessageScrollerMessage>) -> Unit, state: MessageScrollerState) -> Unit)? = null,
) {
    var messages by remember { mutableStateOf(initial) }
    val state = rememberMessageScrollerState()
    val append: (List<MessageScrollerMessage>) -> Unit = { next -> messages = messages + next }
    if (onReady != null) {
        LaunchedEffect(Unit) { onReady(append, state) }
    }
    MessageScrollerFrame {
        Box(Modifier.weight(1f).fillMaxWidth()) {
            MessageScrollerList(messages, state, Modifier.fillMaxSize())
            if (showEmpty && messages.isEmpty()) {
                MessageScrollerEmpty(Modifier.align(Alignment.Center))
            }
        }
        MessageScrollerComposer(state) { text ->
            append(listOf(MessageScrollerMessage("sent-${System.currentTimeMillis()}", true, listOf(text))))
        }
    }
}

@Composable
fun MessageScrollerUnread() {
    MessageScrollerChat(messageScrollerLongThread(40)) { append, state ->
        delay(300)
        state.scrollToStart(animated = false)
        delay(600)
        append(
            listOf(
                MessageScrollerMessage("n1", false, listOf("Are you there?")),
                MessageScrollerMessage("n2", false, listOf("The build is green.")),
                MessageScrollerMessage("n3", false, listOf("Merging now.")),
            ),
        )
    }
}