//
//  ChatView.swift
//  SimpleX
//
//  Created by Evgeny Poberezkin on 27/01/2022.
//  Copyright © 2022 SimpleX Chat. All rights reserved.
//

import SwiftUI
import SimpleXChat
import SwiftyGif
import Combine

private let memberImageSize: CGFloat = 34

struct ChatView: View {
    @EnvironmentObject var chatModel: ChatModel
    @ObservedObject var im = ItemsModel.shared
    @State var mergedItems: BoxedValue<MergedItems> = BoxedValue(MergedItems.create(ItemsModel.shared.reversedChatItems, [], ItemsModel.shared.chatState))
    @State var revealedItems: Set<Int64> = Set()
    @State var theme: AppTheme = buildTheme()
    @Environment(\.dismiss) var dismiss
    @Environment(\.colorScheme) var colorScheme
    @Environment(\.presentationMode) var presentationMode
    @Environment(\.scenePhase) var scenePhase
    @State @ObservedObject var chat: Chat
    @State private var showChatInfoSheet: Bool = false
    @State private var showAddMembersSheet: Bool = false
    @State private var composeState = ComposeState()
    @State private var selectedRange = NSRange()
    @State private var keyboardVisible = false
    @State private var keyboardHiddenDate = Date.now
    @State private var connectionStats: ConnectionStats?
    @State private var customUserProfile: Profile?
    @State private var connectionCode: String?
    @State private var loadingMoreItems = false
    @State private var loadingTopItems = false
    @State private var requestedTopScroll = false
    @State private var loadingBottomItems = false
    @State private var requestedBottomScroll = false
    @State private var showSearch = false
    @State private var searchText: String = ""
    @FocusState private var searchFocussed
    // opening GroupMemberInfoView on member icon
    @State private var selectedMember: GMember? = nil
    // opening GroupLinkView on link button (incognito)
    @State private var showGroupLinkSheet: Bool = false
    @State private var groupLink: CreatedConnLink?
    @State private var groupLinkMemberRole: GroupMemberRole = .member
    @State private var forwardedChatItems: [ChatItem] = []
    @State private var selectedChatItems: Set<Int64>? = nil
    @State private var showDeleteSelectedMessages: Bool = false
    @State private var showArchiveSelectedReports: Bool = false
    @State private var allowToDeleteSelectedMessagesForAll: Bool = false
    @State private var allowLoadMoreItems: Bool = false
    @State private var ignoreLoadingRequests: Int64? = nil
    @State private var animatedScrollingInProgress: Bool = false
    @State private var floatingButtonModel: FloatingButtonModel = FloatingButtonModel()

    @State private var scrollView: EndlessScrollView<MergedItem> = EndlessScrollView(frame: .zero)

    @AppStorage(DEFAULT_TOOLBAR_MATERIAL) private var toolbarMaterial = ToolbarMaterial.defaultMaterial

    var body: some View {
        if #available(iOS 16.0, *) {
            viewBody
                .scrollDismissesKeyboard(.immediately)
                .toolbarBackground(.hidden, for: .navigationBar)
        } else {
            viewBody
        }
    }

    private var viewBody: some View {
        let cInfo = chat.chatInfo
        return ZStack {
            let wallpaperImage = theme.wallpaper.type.image
            let wallpaperType = theme.wallpaper.type
            let backgroundColor = theme.wallpaper.background ?? wallpaperType.defaultBackgroundColor(theme.base, theme.colors.background)
            let tintColor = theme.wallpaper.tint ?? wallpaperType.defaultTintColor(theme.base)
            Color.clear.ignoresSafeArea(.all)
                .if(wallpaperImage != nil) { view in
                    view.modifier(
                        ChatViewBackground(image: wallpaperImage!, imageType: wallpaperType, background: backgroundColor, tint: tintColor)
                    )
            }
            VStack(spacing: 0) {
                ZStack(alignment: .bottomTrailing) {
                    chatItemsList()
                    if let groupInfo = chat.chatInfo.groupInfo, !composeState.message.isEmpty {
                        GroupMentionsView(groupInfo: groupInfo, composeState: $composeState, selectedRange: $selectedRange, keyboardVisible: $keyboardVisible)
                    }
                    FloatingButtons(theme: theme, scrollView: scrollView, chat: chat, loadingMoreItems: $loadingMoreItems, loadingTopItems: $loadingTopItems, requestedTopScroll: $requestedTopScroll, loadingBottomItems: $loadingBottomItems, requestedBottomScroll: $requestedBottomScroll, animatedScrollingInProgress: $animatedScrollingInProgress, listState: scrollView.listState, model: floatingButtonModel, reloadItems: {
                            mergedItems.boxedValue = MergedItems.create(im.reversedChatItems, revealedItems, im.chatState)
                            scrollView.updateItems(mergedItems.boxedValue.items)
                        }
                    )
                }
                connectingText()
                if selectedChatItems == nil {
                    let reason = chat.chatInfo.userCantSendReason
                    ComposeView(
                        chat: chat,
                        composeState: $composeState,
                        keyboardVisible: $keyboardVisible,
                        keyboardHiddenDate: $keyboardHiddenDate,
                        selectedRange: $selectedRange,
                        disabledText: reason?.composeLabel
                    )
                    .disabled(!cInfo.sendMsgEnabled)
                    .if(!cInfo.sendMsgEnabled) { v in
                        v.disabled(true).onTapGesture {
                            AlertManager.shared.showAlertMsg(
                                title: "You can't send messages!",
                                message: reason?.alertMessage
                            )
                        }
                    }
                } else {
                    SelectedItemsBottomToolbar(
                        chatItems: ItemsModel.shared.reversedChatItems,
                        selectedChatItems: $selectedChatItems,
                        chatInfo: chat.chatInfo,
                        deleteItems: { forAll in
                            allowToDeleteSelectedMessagesForAll = forAll
                            showDeleteSelectedMessages = true
                        },
                        archiveItems: {
                            showArchiveSelectedReports = true
                        },
                        moderateItems: {
                            if case let .group(groupInfo) = chat.chatInfo {
                                showModerateSelectedMessagesAlert(groupInfo)
                            }
                        },
                        forwardItems: forwardSelectedMessages
                    )
                }
            }
            if im.showLoadingProgress == chat.id {
                ProgressView().scaleEffect(2)
            }
        }
        .safeAreaInset(edge: .top) {
            VStack(spacing: .zero) {
                if showSearch { searchToolbar() }
                Divider()
            }
            .background(ToolbarMaterial.material(toolbarMaterial))
        }
        .navigationTitle(cInfo.chatViewName)
        .background(theme.colors.background)
        .navigationBarTitleDisplayMode(.inline)
        .environmentObject(theme)
        .confirmationDialog(selectedChatItems?.count == 1 ? "Delete message?" : "Delete \((selectedChatItems?.count ?? 0)) messages?", isPresented: $showDeleteSelectedMessages, titleVisibility: .visible) {
            Button("Delete for me", role: .destructive) {
                if let selected = selectedChatItems {
                    deleteMessages(chat, selected.sorted(), .cidmInternal, moderate: false, deletedSelectedMessages)                }
            }
            if allowToDeleteSelectedMessagesForAll {
                Button(broadcastDeleteButtonText(chat), role: .destructive) {
                    if let selected = selectedChatItems {
                        allowToDeleteSelectedMessagesForAll = false
                        deleteMessages(chat, selected.sorted(), .cidmBroadcast, moderate: false, deletedSelectedMessages)
                    }
                }
            }
        }
        .confirmationDialog(selectedChatItems?.count == 1 ? "Archive report?" : "Archive \((selectedChatItems?.count ?? 0)) reports?", isPresented: $showArchiveSelectedReports, titleVisibility: .visible) {
            Button("For me", role: .destructive) {
                if let selected = selectedChatItems {
                    archiveReports(chat.chatInfo, selected.sorted(), false, deletedSelectedMessages)
                }
            }
            if case let ChatInfo.group(groupInfo) = chat.chatInfo, groupInfo.membership.memberActive {
                Button("For all moderators", role: .destructive) {
                    if let selected = selectedChatItems {
                        archiveReports(chat.chatInfo, selected.sorted(), true, deletedSelectedMessages)
                    }
                }
            }
        }
        .appSheet(item: $selectedMember) { member in
            Group {
                if case let .group(groupInfo) = chat.chatInfo {
                    GroupMemberInfoView(
                        groupInfo: groupInfo,
                        chat: chat,
                        groupMember: member,
                        navigation: true
                    )
                }
            }
        }
        // it should be presented on top level in order to prevent a bug in SwiftUI on iOS 16 related to .focused() modifier in AddGroupMembersView's search field
        .appSheet(isPresented: $showAddMembersSheet) {
            Group {
                if case let .group(groupInfo) = cInfo {
                    AddGroupMembersView(chat: chat, groupInfo: groupInfo)
                }
            }
        }
        .sheet(isPresented: Binding(
            get: { !forwardedChatItems.isEmpty },
            set: { isPresented in
                if !isPresented {
                    forwardedChatItems = []
                    selectedChatItems = nil
                }
            }
        )) {
            if #available(iOS 16.0, *) {
                ChatItemForwardingView(chatItems: forwardedChatItems, fromChatInfo: chat.chatInfo, composeState: $composeState)
                    .presentationDetents([.fraction(0.8)])
            } else {
                ChatItemForwardingView(chatItems: forwardedChatItems, fromChatInfo: chat.chatInfo, composeState: $composeState)
            }
        }
        .onAppear {
            scrollView.listState.onUpdateListener = onChatItemsUpdated
            selectedChatItems = nil
            revealedItems = Set()
            initChatView()
            if im.isLoading {
                Task {
                    try? await Task.sleep(nanoseconds: 500_000000)
                    await MainActor.run {
                        if im.isLoading {
                            im.showLoadingProgress = chat.id
                        }
                    }
                }
            }
        }
        .onChange(of: chatModel.chatId) { cId in
            showChatInfoSheet = false
            selectedChatItems = nil
            revealedItems = Set()
            stopAudioPlayer()
            if let cId {
                if let c = chatModel.getChat(cId) {
                    chat = c
                }
                scrollView.listState.onUpdateListener = onChatItemsUpdated
                initChatView()
                theme = buildTheme()
                closeSearch()
                mergedItems.boxedValue = MergedItems.create(im.reversedChatItems, revealedItems, im.chatState)
                scrollView.updateItems(mergedItems.boxedValue.items)

                if let openAround = chatModel.openAroundItemId, let index = mergedItems.boxedValue.indexInParentItems[openAround] {
                    scrollView.scrollToItem(index)
                } else if let unreadIndex = mergedItems.boxedValue.items.lastIndex(where: { $0.hasUnread() }) {
                    scrollView.scrollToItem(unreadIndex)
                } else {
                    scrollView.scrollToBottom()
                }
                if chatModel.openAroundItemId != nil {
                    chatModel.openAroundItemId = nil
                }
            } else {
                dismiss()
            }
        }
        .onChange(of: chatModel.openAroundItemId) { openAround in
            if let openAround {
                closeSearch()
                mergedItems.boxedValue = MergedItems.create(im.reversedChatItems, revealedItems, im.chatState)
                scrollView.updateItems(mergedItems.boxedValue.items)
                chatModel.openAroundItemId = nil

                if let index = mergedItems.boxedValue.indexInParentItems[openAround] {
                    scrollView.scrollToItem(index)
                }

                // this may already being loading because of changed chat id (see .onChange(of: chat.id)
                if !loadingBottomItems {
                    allowLoadMoreItems = false
                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                        allowLoadMoreItems = true
                    }
                }
            }
        }
        .onDisappear {
            VideoPlayerView.players.removeAll()
            stopAudioPlayer()
            if chatModel.chatId == cInfo.id && !presentationMode.wrappedValue.isPresented {
                DispatchQueue.main.asyncAfter(deadline: .now() + 0.35) {
                    if chatModel.chatId == nil {
                        chatModel.chatItemStatuses = [:]
                        ItemsModel.shared.reversedChatItems = []
                        ItemsModel.shared.chatState.clear()
                        chatModel.groupMembers = []
                        chatModel.groupMembersIndexes.removeAll()
                        chatModel.membersLoaded = false
                    }
                }
            }
        }
        .onChange(of: colorScheme) { _ in
            theme = buildTheme()
        }
        .toolbar {
            ToolbarItem(placement: .principal) {
                if selectedChatItems != nil {
                    SelectedItemsTopToolbar(selectedChatItems: $selectedChatItems)
                } else if case let .direct(contact) = cInfo {
                    Button {
                        Task {
                            showChatInfoSheet = true
                        }
                    } label: {
                        ChatInfoToolbar(chat: chat)
                    }
                    .appSheet(isPresented: $showChatInfoSheet, onDismiss: { theme = buildTheme() }) {
                        ChatInfoView(
                            chat: chat,
                            contact: contact,
                            localAlias: chat.chatInfo.localAlias,
                            featuresAllowed: contactUserPrefsToFeaturesAllowed(contact.mergedPreferences),
                            currentFeaturesAllowed: contactUserPrefsToFeaturesAllowed(contact.mergedPreferences),
                            onSearch: { focusSearch() }
                        )
                    }
                } else if case let .group(groupInfo) = cInfo {
                    Button {
                        Task { await chatModel.loadGroupMembers(groupInfo) { showChatInfoSheet = true } }
                    } label: {
                        ChatInfoToolbar(chat: chat)
                            .tint(theme.colors.primary)
                    }
                    .appSheet(isPresented: $showChatInfoSheet, onDismiss: { theme = buildTheme() }) {
                        GroupChatInfoView(
                            chat: chat,
                            groupInfo: Binding(
                                get: { groupInfo },
                                set: { gInfo in
                                    chat.chatInfo = .group(groupInfo: gInfo)
                                    chat.created = Date.now
                                }
                            ),
                            onSearch: { focusSearch() },
                            localAlias: groupInfo.localAlias
                        )
                    }
                } else if case .local = cInfo {
                    ChatInfoToolbar(chat: chat)
                }
            }
            ToolbarItem(placement: .navigationBarTrailing) {
                if selectedChatItems != nil {
                    Button {
                        withAnimation {
                            selectedChatItems = nil
                        }
                    } label: {
                        Text("Cancel")
                    }
                } else {
                    switch cInfo {
                    case let .direct(contact):
                        HStack {
                            let callsPrefEnabled = contact.mergedPreferences.calls.enabled.forUser
                            if callsPrefEnabled {
                                if chatModel.activeCall == nil {
                                    callButton(contact, .audio, imageName: "phone")
                                        .disabled(!contact.ready || !contact.active)
                                } else if let call = chatModel.activeCall, call.contact.id == cInfo.id {
                                    endCallButton(call)
                                }
                            }
                            Menu {
                                if callsPrefEnabled && chatModel.activeCall == nil {
                                    Button {
                                        CallController.shared.startCall(contact, .video)
                                    } label: {
                                        Label("Video call", systemImage: "video")
                                    }
                                    .disabled(!contact.ready || !contact.active)
                                }
                                searchButton()
                                ToggleNtfsButton(chat: chat)
                                    .disabled(!contact.ready || !contact.active)
                            } label: {
                                Image(systemName: "ellipsis")
                            }
                        }
                    case let .group(groupInfo):
                        HStack {
                            if groupInfo.canAddMembers {
                                if (chat.chatInfo.incognito) {
                                    groupLinkButton()
                                        .appSheet(isPresented: $showGroupLinkSheet) {
                                            GroupLinkView(
                                                groupId: groupInfo.groupId,
                                                groupLink: $groupLink,
                                                groupLinkMemberRole: $groupLinkMemberRole,
                                                showTitle: true,
                                                creatingGroup: false
                                            )
                                        }
                                } else {
                                    addMembersButton()
                                }
                            }
                            Menu {
                                searchButton()
                                ToggleNtfsButton(chat: chat)
                            } label: {
                                Image(systemName: "ellipsis")
                            }
                        }
                    case .local:
                        searchButton()
                    default:
                        EmptyView()
                    }
                }
            }
        }
    }

    private func initChatView() {
        let cInfo = chat.chatInfo
        // This check prevents the call to apiContactInfo after the app is suspended, and the database is closed.
        if case .active = scenePhase,
           case let .direct(contact) = cInfo {
            Task {
                do {
                    let (stats, _) = try await apiContactInfo(chat.chatInfo.apiId)
                    await MainActor.run {
                        if let s = stats {
                            chatModel.updateContactConnectionStats(contact, s)
                        }
                    }
                } catch let error {
                    logger.error("apiContactInfo error: \(responseError(error))")
                }
            }
        }
        if chatModel.draftChatId == cInfo.id && !composeState.forwarding,
           let draft = chatModel.draft {
            composeState = draft
        }
        if chat.chatStats.unreadChat {
            Task {
                await markChatUnread(chat, unreadChat: false)
            }
        }
        floatingButtonModel.updateOnListChange(scrollView.listState)
    }

    private func scrollToItemId(_ itemId: ChatItem.ID) {
        Task {
            do {
                var index = mergedItems.boxedValue.indexInParentItems[itemId]
                if index == nil {
                    let pagination = ChatPagination.around(chatItemId: itemId, count: ChatPagination.PRELOAD_COUNT * 2)
                    let oldSize = ItemsModel.shared.reversedChatItems.count
                    let triedToLoad = await loadChatItems(chat, pagination)
                    if !triedToLoad {
                        return
                    }
                    var repeatsLeft = 50
                    while oldSize == ItemsModel.shared.reversedChatItems.count && repeatsLeft > 0 {
                        try await Task.sleep(nanoseconds: 20_000000)
                        repeatsLeft -= 1
                    }
                    index = mergedItems.boxedValue.indexInParentItems[itemId]
                }
                if let index {
                    closeKeyboardAndRun {
                        Task {
                            await MainActor.run { animatedScrollingInProgress = true }
                            await scrollView.scrollToItemAnimated(min(ItemsModel.shared.reversedChatItems.count - 1, index))
                            await MainActor.run { animatedScrollingInProgress = false }
                        }
                    }
                }
            } catch {
                logger.error("Error scrolling to item: \(error)")
            }
        }
    }

    private func searchToolbar() -> some View {
        HStack(spacing: 12) {
            HStack(spacing: 4) {
                Image(systemName: "magnifyingglass")
                TextField("Search", text: $searchText)
                    .focused($searchFocussed)
                    .foregroundColor(theme.colors.onBackground)
                    .frame(maxWidth: .infinity)

                Button {
                    searchText = ""
                } label: {
                    Image(systemName: "xmark.circle.fill").opacity(searchText == "" ? 0 : 1)
                }
            }
            .padding(EdgeInsets(top: 7, leading: 7, bottom: 7, trailing: 7))
            .foregroundColor(theme.colors.secondary)
            .background(Color(.tertiarySystemFill))
            .cornerRadius(10.0)

            Button ("Cancel") {
                closeSearch()
                searchTextChanged("")
            }
        }
        .padding(.horizontal)
        .padding(.vertical, 8)
    }

    private func voiceWithoutFrame(_ ci: ChatItem) -> Bool {
        ci.content.msgContent?.isVoice == true && ci.content.text.count == 0 && ci.quotedItem == nil && ci.meta.itemForwarded == nil
    }

    private func filtered(_ reversedChatItems: Array<ChatItem>) -> Array<ChatItem> {
        reversedChatItems
            .enumerated()
            .filter { (index, chatItem) in
                if let mergeCategory = chatItem.mergeCategory, index > 0 {
                    mergeCategory != reversedChatItems[index - 1].mergeCategory
                } else {
                    true
                }
            }
            .map { $0.element }
    }

    private func chatItemsList() -> some View {
        let cInfo = chat.chatInfo
        return GeometryReader { g in
            //let _ = logger.debug("Reloading chatItemsList with number of itmes: \(im.reversedChatItems.count)")
            ScrollRepresentable(scrollView: scrollView) { (index: Int, mergedItem: MergedItem) in
                let ci = switch mergedItem {
                case let .single(item, _, _): item.item
                case let .grouped(items, _, _, _, _, _, _, _): items.boxedValue.last!.item
                }
                let voiceNoFrame = voiceWithoutFrame(ci)
                let maxWidth = cInfo.chatType == .group
                ? voiceNoFrame
                ? (g.size.width - 28) - 42
                : (g.size.width - 28) * 0.84 - 42
                : voiceNoFrame
                ? (g.size.width - 32)
                : (g.size.width - 32) * 0.84
                return ChatItemWithMenu(
                    chat: $chat,
                    index: index,
                    isLastItem: index == mergedItems.boxedValue.items.count - 1,
                    chatItem: ci,
                    scrollToItemId: scrollToItemId,
                    merged: mergedItem,
                    maxWidth: maxWidth,
                    composeState: $composeState,
                    selectedMember: $selectedMember,
                    showChatInfoSheet: $showChatInfoSheet,
                    revealedItems: $revealedItems,
                    selectedChatItems: $selectedChatItems,
                    forwardedChatItems: $forwardedChatItems,
                    searchText: $searchText,
                    closeKeyboardAndRun: closeKeyboardAndRun
                )
                // crashes on Cell size calculation without this line
                .environmentObject(ChatModel.shared)
                .environmentObject(theme) // crashes without this line when scrolling to the first unread in EndlessScrollVIew
                .id(ci.id) // Required to trigger `onAppear` on iOS15
            }
            .onAppear {
                if !im.isLoading {
                    updateWithInitiallyLoadedItems()
                }
            }
            .onChange(of: im.isLoading) { loading in
                if !loading {
                    updateWithInitiallyLoadedItems()
                }
            }
            .onChange(of: im.reversedChatItems) { items in
                mergedItems.boxedValue = MergedItems.create(items, revealedItems, im.chatState)
                scrollView.updateItems(mergedItems.boxedValue.items)
                if im.itemAdded {
                    im.itemAdded = false
                    if scrollView.listState.firstVisibleItemIndex < 2 {
                        scrollView.scrollToBottomAnimated()
                    } else {
                        scrollView.scroll(by: 34)
                    }
                }
            }
            .onChange(of: revealedItems) { revealed in
                mergedItems.boxedValue = MergedItems.create(im.reversedChatItems, revealed, im.chatState)
                scrollView.updateItems(mergedItems.boxedValue.items)
            }
            .onChange(of: chat.id) { _ in
                allowLoadMoreItems = false
                DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                    allowLoadMoreItems = true
                }
            }
            .padding(.vertical, -100)
            .onTapGesture { hideKeyboard() }
            .onChange(of: searchText) { s in
                if showSearch {
                    searchTextChanged(s)
                }
            }
        }
    }

    @ViewBuilder private func connectingText() -> some View {
        if case let .direct(contact) = chat.chatInfo,
           !contact.sndReady,
           contact.active,
           !contact.nextSendGrpInv {
            Text("connecting…")
                .font(.caption)
                .foregroundColor(theme.colors.secondary)
                .padding(.top)
        } else {
            EmptyView()
        }
    }

    private func updateWithInitiallyLoadedItems() {
        if mergedItems.boxedValue.items.isEmpty {
            mergedItems.boxedValue = MergedItems.create(im.reversedChatItems, revealedItems, ItemsModel.shared.chatState)
        }
        let unreadIndex = mergedItems.boxedValue.items.lastIndex(where: { $0.hasUnread() })
        let unreadItemId: Int64? = if let unreadIndex { mergedItems.boxedValue.items[unreadIndex].newest().item.id } else { nil }
        // this helps to speed up initial process of setting scroll position and reduce time needed
        // to layout items on screen
        if let unreadIndex, let unreadItemId {
            scrollView.setScrollPosition(unreadIndex, unreadItemId)
        }
        scrollView.updateItems(mergedItems.boxedValue.items)
        if let unreadIndex {
            scrollView.scrollToItem(unreadIndex)
        }
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
            allowLoadMoreItems = true
        }
    }

    private func searchTextChanged(_ s: String) {
        Task {
            await loadChat(chat: chat, search: s)
            mergedItems.boxedValue = MergedItems.create(im.reversedChatItems, revealedItems, im.chatState)
            await MainActor.run {
                scrollView.updateItems(mergedItems.boxedValue.items)
            }
            if !s.isEmpty {
                scrollView.scrollToBottom()
            } else if let index = scrollView.listState.items.lastIndex(where: { $0.hasUnread() }) {
                // scroll to the top unread item
                scrollView.scrollToItem(index)
            } else {
                scrollView.scrollToBottom()
            }
        }
    }

    class FloatingButtonModel: ObservableObject {
        @Published var unreadAbove: Int = 0
        @Published var unreadBelow: Int = 0
        @Published var isNearBottom: Bool = true
        @Published var date: Date? = nil
        @Published var isDateVisible: Bool = false
        var hideDateWorkItem: DispatchWorkItem? = nil

        func updateOnListChange(_ listState: EndlessScrollView<MergedItem>.ListState) {
            let lastVisibleItem = oldestPartiallyVisibleListItemInListStateOrNull(listState)
            let unreadBelow = if let lastVisibleItem {
                max(0, ItemsModel.shared.chatState.unreadTotal - lastVisibleItem.unreadBefore)
            } else {
             0
            }
            let unreadAbove = ItemsModel.shared.chatState.unreadTotal - unreadBelow
            let date: Date? =
            if let lastVisible = listState.visibleItems.last {
                Calendar.current.startOfDay(for: lastVisible.item.oldest().item.meta.itemTs)
                } else {
                    nil
                }

            // set the counters and date indicator
            DispatchQueue.main.async { [weak self] in
                guard let it = self else { return }
                it.setDate(visibility: true)
                it.unreadAbove = unreadAbove
                it.unreadBelow = unreadBelow
                it.date = date
            }

            // set floating button indication mode
            let nearBottom = listState.firstVisibleItemIndex < 1
            if nearBottom != self.isNearBottom {
                DispatchQueue.main.asyncAfter(deadline: .now() + 0.35) { [weak self] in
                    self?.isNearBottom = nearBottom
                }
            }

            // hide Date indicator after 1 second of no scrolling
            hideDateWorkItem?.cancel()
            let workItem = DispatchWorkItem { [weak self] in
                guard let it = self else { return }
                it.setDate(visibility: false)
                it.hideDateWorkItem = nil
            }
            DispatchQueue.main.async { [weak self] in
                self?.hideDateWorkItem = workItem
                DispatchQueue.main.asyncAfter(deadline: .now() + 1, execute: workItem)
            }
        }

        func resetDate() {
            date = nil
            isDateVisible = false
        }

        private func setDate(visibility isVisible: Bool) {
            if isVisible {
                if !isNearBottom,
                   !isDateVisible,
                   let date, !Calendar.current.isDateInToday(date) {
                    withAnimation { self.isDateVisible = true }
                }
            } else if isDateVisible {
                withAnimation { self.isDateVisible = false }
            }
        }

    }

    private struct FloatingButtons: View {
        let theme: AppTheme
        let scrollView: EndlessScrollView<MergedItem>
        let chat: Chat
        @Binding var loadingMoreItems: Bool
        @Binding var loadingTopItems: Bool
        @Binding var requestedTopScroll: Bool
        @Binding var loadingBottomItems: Bool
        @Binding var requestedBottomScroll: Bool
        @Binding var animatedScrollingInProgress: Bool
        let listState: EndlessScrollView<MergedItem>.ListState
        @ObservedObject var model: FloatingButtonModel
        let reloadItems: () -> Void

        var body: some View {
            ZStack(alignment: .top) {
                if let date = model.date {
                     DateSeparator(date: date)
                         .padding(.vertical, 4).padding(.horizontal, 8)
                         .background(.thinMaterial)
                         .clipShape(Capsule())
                         .opacity(model.isDateVisible ? 1 : 0)
                         .padding(.vertical, 4)
                }
                VStack {
                    if model.unreadAbove > 0 && !animatedScrollingInProgress {
                        if loadingTopItems && requestedTopScroll {
                            circleButton { ProgressView() }
                        } else {
                            circleButton {
                                unreadCountText(model.unreadAbove)
                                    .font(.callout)
                                    .foregroundColor(theme.colors.primary)
                            }
                            .onTapGesture {
                                if loadingTopItems {
                                    requestedTopScroll = true
                                    requestedBottomScroll = false
                                } else {
                                    scrollToTopUnread()
                                }
                            }
                            .contextMenu {
                                Button {
                                    Task {
                                        await markChatRead(chat)
                                    }
                                } label: {
                                    Label("Mark read", systemImage: "checkmark")
                                }
                            }
                        }
                    }
                    Spacer()
                    if listState.firstVisibleItemIndex != 0 && !animatedScrollingInProgress {
                        if loadingBottomItems && requestedBottomScroll {
                            circleButton { ProgressView() }
                        } else {
                            circleButton {
                                Group {
                                    if model.unreadBelow > 0 {
                                        unreadCountText(model.unreadBelow)
                                            .font(.callout)
                                            .foregroundColor(theme.colors.primary)
                                    } else {
                                        Image(systemName: "chevron.down").foregroundColor(theme.colors.primary)
                                    }
                                }
                            }
                            .onTapGesture {
                                if loadingBottomItems || !ItemsModel.shared.lastItemsLoaded {
                                    requestedTopScroll = false
                                    requestedBottomScroll = true
                                } else {
                                    scrollToBottom()
                                }
                            }
                        }
                    }
                }
                .padding()
                .frame(maxWidth: .infinity, alignment: .trailing)
            }
            .onChange(of: loadingTopItems) { loading in
                if !loading && requestedTopScroll {
                    requestedTopScroll = false
                    scrollToTopUnread()
                }
            }
            .onChange(of: loadingBottomItems) { loading in
                if !loading && requestedBottomScroll && ItemsModel.shared.lastItemsLoaded {
                    requestedBottomScroll = false
                    scrollToBottom()
                }
            }
            .onDisappear(perform: model.resetDate)
        }

        private func scrollToTopUnread() {
            Task {
                if !ItemsModel.shared.chatState.splits.isEmpty {
                    await MainActor.run { loadingMoreItems = true }
                    await loadChat(chatId: chat.id, openAroundItemId: nil, clearItems: false)
                    await MainActor.run { reloadItems() }
                    if let index = listState.items.lastIndex(where: { $0.hasUnread() }) {
                        await MainActor.run { animatedScrollingInProgress = true }
                        await scrollView.scrollToItemAnimated(index)
                        await MainActor.run { animatedScrollingInProgress = false }
                    }
                    await MainActor.run { loadingMoreItems = false }
                } else if let index = listState.items.lastIndex(where: { $0.hasUnread() }) {
                    await MainActor.run { animatedScrollingInProgress = true }
                    // scroll to the top unread item
                    await scrollView.scrollToItemAnimated(index)
                    await MainActor.run { animatedScrollingInProgress = false }
                } else {
                    logger.debug("No more unread items, total: \(listState.items.count)")
                }
            }
        }

        private func scrollToBottom() {
            animatedScrollingInProgress = true
            Task {
                await scrollView.scrollToItemAnimated(0, top: false)
                await MainActor.run { animatedScrollingInProgress = false }
            }
        }

        private func circleButton<Content: View>(_ content: @escaping () -> Content) -> some View {
            ZStack {
                Circle()
                    .foregroundColor(Color(uiColor: .tertiarySystemGroupedBackground))
                    .frame(width: 44, height: 44)
                content()
            }
        }
    }

    private struct DateSeparator: View {
        let date: Date

        var body: some View {
            Text(String.localizedStringWithFormat(
                NSLocalizedString("%@, %@", comment: "format for date separator in chat"),
                date.formatted(.dateTime.weekday(.abbreviated)),
                date.formatted(
                    Calendar.current.isDate(date, equalTo: .now, toGranularity: .year)
                    ? .dateTime.day().month(.abbreviated)
                    : .dateTime.day().month(.abbreviated).year()
                )
            ))
            .font(.callout)
            .fontWeight(.medium)
            .foregroundStyle(.secondary)
        }
    }

    private func callButton(_ contact: Contact, _ media: CallMediaType, imageName: String) -> some View {
        Button {
            CallController.shared.startCall(contact, media)
        } label: {
            Image(systemName: imageName)
        }
    }

    private func endCallButton(_ call: Call) -> some View {
        Button {
            if CallController.useCallKit(), let callUUID = call.callUUID {
                CallController.shared.endCall(callUUID: callUUID)
            } else {
                CallController.shared.endCall(call: call) {}
            }
        } label: {
            Image(systemName: "phone.down.fill").tint(.red)
        }
    }

    private func searchButton() -> some View {
        Button {
            focusSearch()
        } label: {
            Label("Search", systemImage: "magnifyingglass")
        }
    }

    private func focusSearch() {
        showSearch = true
        searchFocussed = true
        searchText = ""
    }

    private func closeSearch() {
        showSearch = false
        searchText = ""
        searchFocussed = false
    }

    private func closeKeyboardAndRun(_ action: @escaping () -> Void) {
        var delay: TimeInterval = 0
        if keyboardVisible || keyboardHiddenDate.timeIntervalSinceNow >= -1 || showSearch {
            delay = 0.5
            closeSearch()
            hideKeyboard()
        }
        DispatchQueue.main.asyncAfter(deadline: .now() + delay) {
            action()
        }
    }

    private func addMembersButton() -> some View {
        Button {
            if case let .group(gInfo) = chat.chatInfo {
                Task { await chatModel.loadGroupMembers(gInfo) { showAddMembersSheet = true } }
            }
        } label: {
            Image(systemName: "person.crop.circle.badge.plus")
        }
    }

    private func groupLinkButton() -> some View {
        Button {
            if case let .group(gInfo) = chat.chatInfo {
                Task {
                    do {
                        if let link = try apiGetGroupLink(gInfo.groupId) {
                            (groupLink, groupLinkMemberRole) = link
                        }
                    } catch let error {
                        logger.error("ChatView apiGetGroupLink: \(responseError(error))")
                    }
                    showGroupLinkSheet = true
                }
            }
        } label: {
            Image(systemName: "link.badge.plus")
        }
    }

    private func showModerateSelectedMessagesAlert(_ groupInfo: GroupInfo) {
        guard let count = selectedChatItems?.count, count > 0 else { return }

        AlertManager.shared.showAlert(Alert(
            title: Text(count == 1 ? "Delete member message?" : "Delete \(count) messages of members?"),
            message: Text(
                groupInfo.fullGroupPreferences.fullDelete.on
                ? (count == 1 ? "The message will be deleted for all members." : "The messages will be deleted for all members.")
                : (count == 1 ? "The message will be marked as moderated for all members." : "The messages will be marked as moderated for all members.")
            ),
            primaryButton: .destructive(Text("Delete")) {
                if let selected = selectedChatItems {
                    deleteMessages(chat, selected.sorted(), .cidmBroadcast, moderate: true, deletedSelectedMessages)
                }
            },
            secondaryButton: .cancel()
        ))
    }

    private func deletedSelectedMessages() async {
        await MainActor.run {
            withAnimation {
                selectedChatItems = nil
            }
        }
    }

    private func forwardSelectedMessages() {
        Task {
            do {
                if let selectedChatItems {
                    let (validItems, confirmation) = try await apiPlanForwardChatItems(
                        type: chat.chatInfo.chatType,
                        id: chat.chatInfo.apiId,
                        itemIds: Array(selectedChatItems)
                    )
                    if let confirmation {
                        if validItems.count > 0 {
                            showAlert(
                                String.localizedStringWithFormat(
                                    NSLocalizedString("Forward %d message(s)?", comment: "alert title"),
                                    validItems.count
                                ),
                                message: forwardConfirmationText(confirmation) + "\n" +
                                    NSLocalizedString("Forward messages without files?", comment: "alert message")
                            ) {
                                switch confirmation {
                                case let .filesNotAccepted(fileIds):
                                    [forwardAction(validItems), downloadAction(fileIds), cancelAlertAction]
                                default:
                                    [forwardAction(validItems), cancelAlertAction]
                                }
                            }
                        } else {
                            showAlert(
                                NSLocalizedString("Nothing to forward!", comment: "alert title"),
                                message: forwardConfirmationText(confirmation)
                            ) {
                                switch confirmation {
                                case let .filesNotAccepted(fileIds):
                                    [downloadAction(fileIds), cancelAlertAction]
                                default:
                                    [okAlertAction]
                                }
                            }
                        }
                    } else {
                        await openForwardingSheet(validItems)
                    }
                }
            } catch {
                logger.error("Plan forward chat items failed: \(error.localizedDescription)")
            }
        }

        func forwardConfirmationText(_ fc: ForwardConfirmation) -> String {
            switch fc {
            case let .filesNotAccepted(fileIds):
                String.localizedStringWithFormat(
                    NSLocalizedString("%d file(s) were not downloaded.", comment: "forward confirmation reason"),
                    fileIds.count
                )
            case let .filesInProgress(filesCount):
                String.localizedStringWithFormat(
                    NSLocalizedString("%d file(s) are still being downloaded.", comment: "forward confirmation reason"),
                    filesCount
                )
            case let .filesMissing(filesCount):
                String.localizedStringWithFormat(
                    NSLocalizedString("%d file(s) were deleted.", comment: "forward confirmation reason"),
                    filesCount
                )
            case let .filesFailed(filesCount):
                String.localizedStringWithFormat(
                    NSLocalizedString("%d file(s) failed to download.", comment: "forward confirmation reason"),
                    filesCount
                )
            }
        }

        func forwardAction(_ items: [Int64]) -> UIAlertAction {
            UIAlertAction(
                title: NSLocalizedString("Forward messages", comment: "alert action"),
                style: .default,
                handler: { _ in Task { await openForwardingSheet(items) } }
            )
        }

        func downloadAction(_ fileIds: [Int64]) -> UIAlertAction {
            UIAlertAction(
                title: NSLocalizedString("Download files", comment: "alert action"),
                style: .default,
                handler: { _ in
                    Task {
                        if let user = ChatModel.shared.currentUser {
                            await receiveFiles(user: user, fileIds: fileIds)
                        }
                    }
                }
            )
        }

        func openForwardingSheet(_ items: [Int64]) async {
            let im = ItemsModel.shared
            var items = Set(items)
            var fci = [ChatItem]()
            for reversedChatItem in im.reversedChatItems {
                if items.contains(reversedChatItem.id) {
                    items.remove(reversedChatItem.id)
                    fci.insert(reversedChatItem, at: 0)
                }
                if items.isEmpty { break }
            }
            await MainActor.run { forwardedChatItems = fci }
        }
    }

    private func loadChatItems(_ chat: Chat, _ pagination: ChatPagination) async -> Bool {
        if loadingMoreItems { return false }
        await MainActor.run {
            loadingMoreItems = true
            if case .before = pagination {
                loadingTopItems = true
            } else if case .after = pagination {
                loadingBottomItems = true
            }
        }
        let triedToLoad = await loadChatItemsUnchecked(chat, pagination)
        await MainActor.run {
            loadingMoreItems = false
            if case .before = pagination {
                loadingTopItems = false
            } else if case .after = pagination {
                loadingBottomItems = false
            }
        }
        return triedToLoad
    }

    private func loadChatItemsUnchecked(_ chat: Chat, _ pagination: ChatPagination) async -> Bool {
        await apiLoadMessages(
            chat.chatInfo.id,
            pagination,
            im.chatState,
            searchText,
            nil,
            { visibleItemIndexesNonReversed(scrollView.listState, mergedItems.boxedValue) }
        )
        return true
    }

    func stopAudioPlayer() {
        VoiceItemState.chatView.values.forEach { $0.audioPlayer?.stop() }
        VoiceItemState.chatView = [:]
    }

    func onChatItemsUpdated() {
        if !mergedItems.boxedValue.isActualState() {
            //logger.debug("Items are not actual, waiting for the next update: \(String(describing: mergedItems.boxedValue.splits))  \(ItemsModel.shared.chatState.splits), \(mergedItems.boxedValue.indexInParentItems.count) vs \(ItemsModel.shared.reversedChatItems.count)")
            return
        }
        floatingButtonModel.updateOnListChange(scrollView.listState)
        preloadIfNeeded(
            $allowLoadMoreItems,
            $ignoreLoadingRequests,
            scrollView.listState,
            mergedItems,
            loadItems: { unchecked, pagination in
                if unchecked {
                    await loadChatItemsUnchecked(chat, pagination)
                } else {
                    await loadChatItems(chat, pagination)
                }
            },
            loadLastItems: {
                if !loadingMoreItems {
                    await loadLastItems($loadingMoreItems, loadingBottomItems: $loadingBottomItems, chat)
                }
            }
        )
    }

    private struct ChatItemWithMenu: View {
        @EnvironmentObject var m: ChatModel
        @EnvironmentObject var theme: AppTheme
        @AppStorage(DEFAULT_PROFILE_IMAGE_CORNER_RADIUS) private var profileRadius = defaultProfileImageCorner
        @Binding @ObservedObject var chat: Chat
        @ObservedObject var dummyModel: ChatItemDummyModel = .shared
        let index: Int
        let isLastItem: Bool
        let chatItem: ChatItem
        let scrollToItemId: (ChatItem.ID) -> Void
        let merged: MergedItem
        let maxWidth: CGFloat
        @Binding var composeState: ComposeState
        @Binding var selectedMember: GMember?
        @Binding var showChatInfoSheet: Bool
        @Binding var revealedItems: Set<Int64>

        @State private var deletingItem: ChatItem? = nil
        @State private var showDeleteMessage = false
        @State private var deletingItems: [Int64] = []
        @State private var showDeleteMessages = false
        @State private var archivingReports: Set<Int64>? = nil
        @State private var showArchivingReports = false
        @State private var showChatItemInfoSheet: Bool = false
        @State private var chatItemInfo: ChatItemInfo?
        @State private var msgWidth: CGFloat = 0
        @State private var touchInProgress: Bool = false

        @Binding var selectedChatItems: Set<Int64>?
        @Binding var forwardedChatItems: [ChatItem]

        @Binding var searchText: String
        var closeKeyboardAndRun: (@escaping () -> Void) -> Void

        @State private var allowMenu: Bool = true
        @State private var markedRead = false
        @State private var markReadTask: Task<Void, Never>? = nil
        @State private var actionSheet: SomeActionSheet? = nil

        var revealed: Bool { revealedItems.contains(chatItem.id) }

        typealias ItemSeparation = (timestamp: Bool, largeGap: Bool, date: Date?)

        private func reveal(_ yes: Bool) -> Void {
            merged.revealItems(yes, $revealedItems)
        }

        func getItemSeparation(_ chatItem: ChatItem, _ prevItem: ChatItem?) -> ItemSeparation {
            guard let prevItem else {
                return ItemSeparation(timestamp: true, largeGap: true, date: nil)
            }

            let sameMemberAndDirection = if case .groupRcv(let prevGroupMember) = prevItem.chatDir, case .groupRcv(let groupMember) = chatItem.chatDir {
                groupMember.groupMemberId == prevGroupMember.groupMemberId
            } else {
                chatItem.chatDir.sent == prevItem.chatDir.sent
            }
            let largeGap = !sameMemberAndDirection || prevItem.meta.itemTs.timeIntervalSince(chatItem.meta.itemTs) > 60

            return ItemSeparation(
                timestamp: largeGap || formatTimestampMeta(chatItem.meta.itemTs) != formatTimestampMeta(prevItem.meta.itemTs),
                largeGap: largeGap,
                date: Calendar.current.isDate(chatItem.meta.itemTs, inSameDayAs: prevItem.meta.itemTs) ? nil : prevItem.meta.itemTs
            )
        }

        func shouldShowAvatar(_ current: ChatItem, _ older: ChatItem?) -> Bool {
            let oldIsGroupRcv = switch older?.chatDir {
            case .groupRcv: true
            default: false
            }
            let sameMember = switch (older?.chatDir, current.chatDir) {
            case (.groupRcv(let oldMember), .groupRcv(let member)):
                oldMember.memberId == member.memberId
            default:
                false
            }
            if case .groupRcv = current.chatDir, (older == nil || (!oldIsGroupRcv || !sameMember)) {
                return true
            } else {
                return false
            }
        }

        var body: some View {
            let im = ItemsModel.shared

            let last = isLastItem ? im.reversedChatItems.last : nil
            let listItem = merged.newest()
            let item = listItem.item
            let range: ClosedRange<Int>? = if case let .grouped(_, _, _, rangeInReversed, _, _, _, _) = merged {
                rangeInReversed.boxedValue
            } else {
                nil
            }
            let showAvatar = shouldShowAvatar(item, listItem.nextItem)
            let single = switch merged {
            case .single: true
            default: false
            }
            let itemSeparation = getItemSeparation(item, single || revealed ? listItem.prevItem: nil)
            return VStack(spacing: 0) {
                if let last {
                    DateSeparator(date: last.meta.itemTs).padding(8)
                }
                chatItemListView(range, showAvatar, item, itemSeparation)
                    .overlay {
                        if let selected = selectedChatItems, chatItem.canBeDeletedForSelf {
                            Color.clear
                                .contentShape(Rectangle())
                                .simultaneousGesture(TapGesture().onEnded {
                                    let checked = selected.contains(chatItem.id)
                                    selectUnselectChatItem(select: !checked, chatItem)
                                })
                        }
                    }
                if let date = itemSeparation.date {
                    DateSeparator(date: date).padding(8)
                }
            }
            .onAppear {
                if markedRead {
                    return
                } else {
                    markedRead = true
                }
                if let range {
                    let (itemIds, unreadMentions) = unreadItemIds(range)
                    if !itemIds.isEmpty {
                        waitToMarkRead {
                            await apiMarkChatItemsRead(chat.chatInfo, itemIds, mentionsRead: unreadMentions)
                        }
                    }
                } else if chatItem.isRcvNew  {
                    waitToMarkRead {
                        await apiMarkChatItemsRead(chat.chatInfo, [chatItem.id], mentionsRead: chatItem.meta.userMention ? 1 : 0)
                    }
                }
            }
            .onDisappear {
                markReadTask?.cancel()
                markedRead = false
            }
            .actionSheet(item: $actionSheet) { $0.actionSheet }
            // skip updating struct on touch if no need to show GoTo button
            .if(touchInProgress || searchIsNotBlank || (chatItem.meta.itemForwarded != nil && chatItem.meta.itemForwarded != .unknown)) {
                // long press listener steals taps from top-level listener, so repeating it's logic here as well
                $0.onTapGesture {
                    hideKeyboard()
                }
                .onLongPressGesture(minimumDuration: .infinity, perform: {}, onPressingChanged: { pressing in
                    touchInProgress = pressing
                })
            }
        }

        private func unreadItemIds(_ range: ClosedRange<Int>) -> ([ChatItem.ID], Int) {
            let im = ItemsModel.shared
            var unreadItems: [ChatItem.ID] = []
            var unreadMentions: Int = 0

            for i in range {
                if i < 0 || i >= im.reversedChatItems.count {
                    break
                }
                let ci = im.reversedChatItems[i]
                if ci.isRcvNew {
                    unreadItems.append(ci.id)
                    if ci.meta.userMention {
                        unreadMentions += 1
                    }
                }
            }

            return (unreadItems, unreadMentions)
        }

        private func waitToMarkRead(_ op: @Sendable @escaping () async -> Void) {
            markReadTask = Task {
                do {
                    _ = try await Task.sleep(nanoseconds: 600_000000)
                    if m.chatId == chat.chatInfo.id {
                        await op()
                    }
                } catch {
                    // task was cancelled
                }
            }
        }

        private var searchIsNotBlank: Bool {
            get {
                searchText.count > 0 && !searchText.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
            }
        }

        @available(iOS 16.0, *)
        struct MemberLayout: Layout {
            let spacing: Double
            let msgWidth: Double

            private func sizes(subviews: Subviews, proposal: ProposedViewSize) -> (CGSize, CGSize) {
                assert(subviews.count == 2, "member layout must contain exactly two subviews")
                let roleSize = subviews[1].sizeThatFits(proposal)
                let memberSize = subviews[0].sizeThatFits(
                    ProposedViewSize(
                        width: (proposal.width ?? msgWidth) - roleSize.width,
                        height: proposal.height
                    )
                )
                return (memberSize, roleSize)
            }

            func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout Void) -> CGSize {
                let (memberSize, roleSize) = sizes(subviews: subviews, proposal: proposal)
                return CGSize(
                    width: min(
                        proposal.width ?? msgWidth,
                        max(msgWidth, roleSize.width + spacing + memberSize.width)
                    ),
                    height: max(memberSize.height, roleSize.height)
                )
            }

            func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout Void) {
                let (memberSize, roleSize) = sizes(subviews: subviews, proposal: proposal)
                subviews[0].place(
                    at: CGPoint(x: bounds.minX, y: bounds.midY - memberSize.height / 2),
                    proposal: ProposedViewSize(memberSize)
                )
                subviews[1].place(
                    at: CGPoint(
                        x: bounds.minX + max(memberSize.width + spacing, msgWidth - roleSize.width),
                        y: bounds.midY - roleSize.height / 2
                    ),
                    proposal: ProposedViewSize(roleSize)
                )
            }
        }

        @ViewBuilder func chatItemListView(
            _ range: ClosedRange<Int>?,
            _ showAvatar: Bool,
            _ ci: ChatItem,
            _ itemSeparation: ItemSeparation
        ) -> some View {
            let bottomPadding: Double = itemSeparation.largeGap ? 10 : 2
            if case let .groupRcv(member) = ci.chatDir,
               case .group = chat.chatInfo {
                if showAvatar {
                    VStack(alignment: .leading, spacing: 4) {
                        if ci.content.showMemberName {
                            Group {
                                let (prevMember, memCount): (GroupMember?, Int) =
                                if let range = range {
                                    m.getPrevHiddenMember(member, range)
                                } else {
                                    (nil, 1)
                                }
                                if memCount == 1 && member.memberRole > .member {
                                    Group {
                                        if #available(iOS 16.0, *) {
                                            MemberLayout(spacing: 16, msgWidth: msgWidth) {
                                                Text(member.chatViewName)
                                                    .lineLimit(1)
                                                Text(member.memberRole.text)
                                                    .fontWeight(.semibold)
                                                    .lineLimit(1)
                                                    .padding(.trailing, 8)
                                            }
                                        } else {
                                            HStack(spacing: 16) {
                                                Text(member.chatViewName)
                                                    .lineLimit(1)
                                                Text(member.memberRole.text)
                                                    .fontWeight(.semibold)
                                                    .lineLimit(1)
                                                    .layoutPriority(1)
                                            }
                                        }
                                    }
                                    .frame(
                                        maxWidth: maxWidth,
                                        alignment: chatItem.chatDir.sent ? .trailing : .leading
                                    )
                                } else {
                                    Text(memberNames(member, prevMember, memCount))
                                        .lineLimit(2)
                                }
                            }
                                .font(.caption)
                                .foregroundStyle(.secondary)
                                .padding(.leading, memberImageSize + 14 + (selectedChatItems != nil && ci.canBeDeletedForSelf ? 12 + 24 : 0))
                                .padding(.top, 3) // this is in addition to message sequence gap
                        }
                        HStack(alignment: .center, spacing: 0) {
                            if selectedChatItems != nil && ci.canBeDeletedForSelf {
                                SelectedChatItem(ciId: ci.id, selectedChatItems: $selectedChatItems)
                                    .padding(.trailing, 12)
                            }
                            HStack(alignment: .top, spacing: 10) {
                                MemberProfileImage(member, size: memberImageSize, backgroundColor: theme.colors.background)
                                    .simultaneousGesture(TapGesture().onEnded {
                                        if let mem = m.getGroupMember(member.groupMemberId) {
                                            selectedMember = mem
                                        } else {
                                            let mem = GMember.init(member)
                                            m.groupMembers.append(mem)
                                            m.groupMembersIndexes[member.groupMemberId] = m.groupMembers.count - 1
                                            selectedMember = mem
                                        }
                                    })
                                chatItemWithMenu(ci, range, maxWidth, itemSeparation)
                                    .onPreferenceChange(DetermineWidth.Key.self) { msgWidth = $0 }
                            }
                        }
                    }
                    .padding(.bottom, bottomPadding)
                    .padding(.trailing)
                    .padding(.leading, 12)
                } else {
                    HStack(alignment: .center, spacing: 0) {
                        if selectedChatItems != nil && ci.canBeDeletedForSelf {
                            SelectedChatItem(ciId: ci.id, selectedChatItems: $selectedChatItems)
                                .padding(.leading, 12)
                        }
                        chatItemWithMenu(ci, range, maxWidth, itemSeparation)
                            .padding(.trailing)
                            .padding(.leading, 10 + memberImageSize + 12)
                    }
                    .padding(.bottom, bottomPadding)
                }
            } else {
                HStack(alignment: .center, spacing: 0) {
                    if selectedChatItems != nil && ci.canBeDeletedForSelf {
                        if chat.chatInfo.chatType == .group {
                            SelectedChatItem(ciId: ci.id, selectedChatItems: $selectedChatItems)
                                .padding(.leading, 12)
                        } else {
                            SelectedChatItem(ciId: ci.id, selectedChatItems: $selectedChatItems)
                                .padding(.leading)
                        }
                    }
                    chatItemWithMenu(ci, range, maxWidth, itemSeparation)
                        .padding(.horizontal)
                }
                .padding(.bottom, bottomPadding)
            }
        }

        private func memberNames(_ member: GroupMember, _ prevMember: GroupMember?, _ memCount: Int) -> LocalizedStringKey {
            let name = member.displayName
            return if let prevName = prevMember?.displayName {
                memCount > 2
                ? "\(name), \(prevName) and \(memCount - 2) members"
                : "\(name) and \(prevName)"
            } else {
                "\(name)"
            }
        }

        func chatItemWithMenu(_ ci: ChatItem, _ range: ClosedRange<Int>?, _ maxWidth: CGFloat, _ itemSeparation: ItemSeparation) -> some View {
            let alignment: Alignment = ci.chatDir.sent ? .trailing : .leading
            return VStack(alignment: alignment.horizontal, spacing: 3) {
                HStack {
                    if ci.chatDir.sent {
                        goToItemButton(true)
                    }
                    ChatItemView(
                        chat: chat,
                        chatItem: ci,
                        scrollToItemId: scrollToItemId,
                        maxWidth: maxWidth,
                        allowMenu: $allowMenu
                    )
                    .environment(\.revealed, revealed)
                    .environment(\.showTimestamp, itemSeparation.timestamp)
                    .modifier(ChatItemClipped(ci, tailVisible: itemSeparation.largeGap && (ci.meta.itemDeleted == nil || revealed)))
                    .contextMenu { menu(ci, range, live: composeState.liveMessage != nil) }
                    .accessibilityLabel("")
                    if !ci.chatDir.sent {
                        goToItemButton(false)
                    }
                }
                if ci.content.msgContent != nil && (ci.meta.itemDeleted == nil || revealed) && ci.reactions.count > 0 {
                    chatItemReactions(ci)
                        .padding(.bottom, 4)
                }
            }
                .confirmationDialog("Delete message?", isPresented: $showDeleteMessage, titleVisibility: .visible) {
                    Button("Delete for me", role: .destructive) {
                        deleteMessage(.cidmInternal, moderate: false)
                    }
                    if let di = deletingItem, di.meta.deletable && !di.localNote && !di.isReport {
                        Button(broadcastDeleteButtonText(chat), role: .destructive) {
                            deleteMessage(.cidmBroadcast, moderate: false)
                        }
                    }
                }
                .confirmationDialog(deleteMessagesTitle, isPresented: $showDeleteMessages, titleVisibility: .visible) {
                    Button("Delete for me", role: .destructive) {
                        deleteMessages(chat, deletingItems, moderate: false)
                    }
                }
                .confirmationDialog(archivingReports?.count == 1 ? "Archive report?" : "Archive \(archivingReports?.count ?? 0) reports?", isPresented: $showArchivingReports, titleVisibility: .visible) {
                    Button("For me", role: .destructive) {
                        if let reports = self.archivingReports {
                            archiveReports(chat.chatInfo, reports.sorted(), false)
                            self.archivingReports = []
                        }
                    }
                    if case let ChatInfo.group(groupInfo) = chat.chatInfo, groupInfo.membership.memberActive {
                        Button("For all moderators", role: .destructive) {
                            if let reports = self.archivingReports {
                                archiveReports(chat.chatInfo, reports.sorted(), true)
                                self.archivingReports = []
                            }
                        }
                    }
                }
                .frame(maxWidth: maxWidth, maxHeight: .infinity, alignment: alignment)
                .frame(minWidth: 0, maxWidth: .infinity, alignment: alignment)
                .sheet(isPresented: $showChatItemInfoSheet, onDismiss: {
                    chatItemInfo = nil
                }) {
                    ChatItemInfoView(ci: ci, userMemberId: chat.chatInfo.groupInfo?.membership.memberId, chatItemInfo: $chatItemInfo)
                }
        }

        private func showMemberImage(_ member: GroupMember, _ prevItem: ChatItem?) -> Bool {
            switch (prevItem?.chatDir) {
            case .groupSnd: return true
            case let .groupRcv(prevMember): return prevMember.groupMemberId != member.groupMemberId
            default: return false
            }
        }

        private func chatItemReactions(_ ci: ChatItem) -> some View {
            HStack(spacing: 4) {
                ForEach(ci.reactions, id: \.reaction) { r in
                    let v = HStack(spacing: 4) {
                        switch r.reaction {
                        case let .emoji(emoji): Text(emoji.rawValue).font(.caption)
                        case .unknown: EmptyView()
                        }
                        if r.totalReacted > 1 {
                            Text("\(r.totalReacted)")
                                .font(.caption)
                                .fontWeight(r.userReacted ? .bold : .light)
                                .foregroundColor(r.userReacted ? theme.colors.primary : theme.colors.secondary)
                        }
                    }
                    .padding(.horizontal, 6)
                    .padding(.vertical, 4)
                    .if(chat.chatInfo.featureEnabled(.reactions) && (ci.allowAddReaction || r.userReacted)) { v in
                        v.simultaneousGesture(TapGesture().onEnded {
                            setReaction(ci, add: !r.userReacted, reaction: r.reaction)
                        })
                    }
                    switch chat.chatInfo {
                    case let .group(groupInfo):
                        v.contextMenu {
                            ReactionContextMenu(
                                groupInfo: groupInfo,
                                itemId: ci.id,
                                reactionCount: r,
                                selectedMember: $selectedMember,
                                profileRadius: profileRadius
                            )
                        }
                    case let .direct(contact):
                        v.contextMenu {
                            contactReactionMenu(contact, r)
                        }
                    default:
                        v
                    }
                }
            }
        }

        @ViewBuilder
        private func menu(_ ci: ChatItem, _ range: ClosedRange<Int>?, live: Bool) -> some View {
            if case let .group(gInfo) = chat.chatInfo, ci.isReport, ci.meta.itemDeleted == nil {
                if ci.chatDir != .groupSnd, gInfo.membership.memberRole >= .moderator {
                    archiveReportButton(ci)
                }
                deleteButton(ci, label: "Delete report")
            } else if let mc = ci.content.msgContent, !ci.isReport, ci.meta.itemDeleted == nil || revealed {
                if chat.chatInfo.featureEnabled(.reactions) && ci.allowAddReaction,
                   availableReactions.count > 0 {
                    reactionsGroup
                }
                if ci.meta.itemDeleted == nil && !ci.isLiveDummy && !live && !ci.localNote {
                    replyButton
                }
                let fileSource = getLoadedFileSource(ci.file)
                let fileExists = if let fs = fileSource, FileManager.default.fileExists(atPath: getAppFilePath(fs.filePath).path) { true } else { false }
                let copyAndShareAllowed = !ci.content.text.isEmpty || (ci.content.msgContent?.isImage == true && fileExists)
                if copyAndShareAllowed {
                    shareButton(ci)
                    copyButton(ci)
                }
                if let fileSource = fileSource, fileExists {
                    if case .image = ci.content.msgContent, let image = getLoadedImage(ci.file) {
                        if image.imageData != nil {
                            saveButton(file: fileSource)
                        } else {
                            saveButton(image: image)
                        }
                    } else {
                        saveButton(file: fileSource)
                    }
                } else if let file = ci.file, case .rcvInvitation = file.fileStatus, fileSizeValid(file) {
                    downloadButton(file: file)
                }
                if ci.meta.editable && !mc.isVoice && !live {
                    editButton(chatItem)
                }
                if ci.meta.itemDeleted == nil
                    && (ci.file == nil || (fileSource != nil && fileExists))
                    && !ci.isLiveDummy && !live {
                    forwardButton
                }
                if !ci.isLiveDummy {
                    viewInfoButton(ci)
                }
                if revealed {
                   hideButton()
                }
                if ci.meta.itemDeleted == nil && !ci.localNote,
                   let file = ci.file,
                   let cancelAction = file.cancelAction {
                    cancelFileButton(file.fileId, cancelAction)
                }
                if !live || !ci.meta.isLive {
                    deleteButton(ci)
                }
                if ci.chatDir != .groupSnd {
                    if let (groupInfo, _) = ci.memberToModerate(chat.chatInfo) {
                        moderateButton(ci, groupInfo)
                    } else if ci.meta.itemDeleted == nil && chat.groupFeatureEnabled(.reports),
                              case let .group(gInfo) = chat.chatInfo,
                              gInfo.membership.memberRole == .member
                                && !live
                                && composeState.voiceMessageRecordingState == .noRecording {
                        reportButton(ci)
                    }
                }
            } else if ci.meta.itemDeleted != nil {
                if revealed {
                    hideButton()
                } else if !ci.isDeletedContent {
                    revealButton(ci)
                } else if range != nil {
                    expandButton()
                }
                viewInfoButton(ci)
                deleteButton(ci)
            } else if ci.isDeletedContent {
                viewInfoButton(ci)
                deleteButton(ci)
            } else if ci.mergeCategory != nil && ((range?.count ?? 0) > 1 || revealed) {
                if revealed { shrinkButton() } else { expandButton() }
                deleteButton(ci)
            } else if ci.showLocalDelete {
                deleteButton(ci)
            } else {
                EmptyView()
            }
            if selectedChatItems == nil && ci.canBeDeletedForSelf {
                Divider()
                selectButton(ci)
            }
        }

        var replyButton: Button<some View> {
            Button {
                withAnimation {
                    if composeState.editing {
                        composeState = ComposeState(contextItem: .quotedItem(chatItem: chatItem))
                    } else {
                        composeState = composeState.copy(contextItem: .quotedItem(chatItem: chatItem))
                    }
                }
            } label: {
                Label(
                    NSLocalizedString("Reply", comment: "chat item action"),
                    systemImage: "arrowshape.turn.up.left"
                )
            }
        }

        var forwardButton: Button<some View> {
            Button {
                forwardedChatItems = [chatItem]
            } label: {
                Label(
                    NSLocalizedString("Forward", comment: "chat item action"),
                    systemImage: "arrowshape.turn.up.forward"
                )
            }
        }

        private var reactionsGroup: some View {
            if #available(iOS 16.4, *) {
                return ControlGroup {
                    if availableReactions.count > 4 {
                        reactions(till: 3)
                        Menu {
                            reactions(from: 3)
                        } label: {
                            Image(systemName: "ellipsis")
                        }
                    } else { reactions() }
                }.controlGroupStyle(.compactMenu)
            } else {
                return Menu {
                    reactions()
                } label: {
                    Label(
                        NSLocalizedString("React…", comment: "chat item menu"),
                        systemImage: "face.smiling"
                    )
                }
            }
        }

        func reactions(from: Int? = nil, till: Int? = nil) -> some View {
            ForEach(availableReactions[(from ?? 0)..<(till ?? availableReactions.count)]) { reaction in
                Button(reaction.text) {
                    setReaction(chatItem, add: true, reaction: reaction)
                }
            }
        }

        /// Reactions, which has not been used yet
        private var availableReactions: Array<MsgReaction> {
            MsgReaction.values
                .filter { reaction in
                    !chatItem.reactions.contains {
                        $0.userReacted && $0.reaction == reaction
                    }
                }
        }

        private func setReaction(_ ci: ChatItem, add: Bool, reaction: MsgReaction) {
            Task {
                do {
                    let cInfo = chat.chatInfo
                    let chatItem = try await apiChatItemReaction(
                        type: cInfo.chatType,
                        id: cInfo.apiId,
                        itemId: ci.id,
                        add: add,
                        reaction: reaction
                    )
                    await MainActor.run {
                        m.updateChatItem(chat.chatInfo, chatItem)
                    }
                } catch let error {
                    logger.error("apiChatItemReaction error: \(responseError(error))")
                }
            }
        }

        private func shareButton(_ ci: ChatItem) -> Button<some View> {
            Button {
                var shareItems: [Any] = [ci.content.text]
                if case .image = ci.content.msgContent, let image = getLoadedImage(ci.file) {
                    shareItems.append(image)
                }
                showShareSheet(items: shareItems)
            } label: {
                Label(
                    NSLocalizedString("Share", comment: "chat item action"),
                    systemImage: "square.and.arrow.up"
                )
            }
        }

        private func copyButton(_ ci: ChatItem) -> Button<some View> {
            Button {
                if case let .image(text, _) = ci.content.msgContent,
                   text == "",
                   let image = getLoadedImage(ci.file) {
                    UIPasteboard.general.image = image
                } else {
                    UIPasteboard.general.string = ci.content.text
                }
            } label: {
                Label("Copy", systemImage: "doc.on.doc")
            }
        }

        func saveButton(image: UIImage) -> Button<some View> {
            Button {
                UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
            } label: {
                Label(
                    NSLocalizedString("Save", comment: "chat item action"),
                    systemImage: "square.and.arrow.down"
                )
            }
        }

        func saveButton(file: CryptoFile) -> Button<some View> {
            Button {
                saveCryptoFile(file)
            } label: {
                Label(
                    NSLocalizedString("Save", comment: "chat item action"),
                    systemImage: file.cryptoArgs == nil ? "square.and.arrow.down" : "lock.open"
                )
            }
        }

        func downloadButton(file: CIFile) -> Button<some View> {
            Button {
                Task {
                    logger.debug("ChatView downloadFileAction, in Task")
                    if let user = m.currentUser {
                        await receiveFile(user: user, fileId: file.fileId)
                    }
                }
            } label: {
                Label(
                    NSLocalizedString("Download", comment: "chat item action"),
                    systemImage: "arrow.down.doc"
                )
            }
        }

        private func editButton(_ ci: ChatItem) -> Button<some View> {
            Button {
                withAnimation {
                    composeState = ComposeState(editingItem: ci)
                }
            } label: {
                Label(
                    NSLocalizedString("Edit", comment: "chat item action"),
                    systemImage: "square.and.pencil"
                )
            }
        }

        private func selectButton(_ ci: ChatItem) -> Button<some View> {
            Button {
                DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                    withAnimation {
                        selectUnselectChatItem(select: true, ci)
                    }
                }
            } label: {
                Label(
                    NSLocalizedString("Select", comment: "chat item action"),
                    systemImage: "checkmark.circle"
                )
            }
        }

        private func viewInfoButton(_ ci: ChatItem) -> Button<some View> {
            Button {
                Task {
                    do {
                        let cInfo = chat.chatInfo
                        let ciInfo = try await apiGetChatItemInfo(type: cInfo.chatType, id: cInfo.apiId, itemId: ci.id)
                        await MainActor.run {
                            chatItemInfo = ciInfo
                        }
                        if case let .group(gInfo) = chat.chatInfo {
                            await m.loadGroupMembers(gInfo)
                        }
                    } catch let error {
                        logger.error("apiGetChatItemInfo error: \(responseError(error))")
                    }
                    await MainActor.run { showChatItemInfoSheet = true }
                }
            } label: {
                Label(
                    NSLocalizedString("Info", comment: "chat item action"),
                    systemImage: "info.circle"
                )
            }
        }

        private func cancelFileButton(_ fileId: Int64, _ cancelAction: CancelAction) -> Button<some View> {
            Button {
                AlertManager.shared.showAlert(Alert(
                    title: Text(cancelAction.alert.title),
                    message: Text(cancelAction.alert.message),
                    primaryButton: .destructive(Text(cancelAction.alert.confirm)) {
                        Task {
                            if let user = m.currentUser {
                                await cancelFile(user: user, fileId: fileId)
                            }
                        }
                    },
                    secondaryButton: .cancel()
                ))
            } label: {
                Label(
                    cancelAction.uiAction,
                    systemImage: "xmark"
                )
            }
        }

        private func hideButton() -> Button<some View> {
            Button {
                withConditionalAnimation {
                    reveal(false)
                }
            } label: {
                Label(
                    NSLocalizedString("Hide", comment: "chat item action"),
                    systemImage: "eye.slash"
                )
            }
        }

        private func deleteButton(_ ci: ChatItem, label: LocalizedStringKey = "Delete") -> Button<some View> {
            Button(role: .destructive) {
                if !revealed,
                   let currIndex = m.getChatItemIndex(ci),
                   let ciCategory = ci.mergeCategory {
                    let (prevHidden, _) = m.getPrevShownChatItem(currIndex, ciCategory)
                    if let range = itemsRange(currIndex, prevHidden) {
                        var itemIds: [Int64] = []
                        for i in range {
                            itemIds.append(ItemsModel.shared.reversedChatItems[i].id)
                        }
                        showDeleteMessages = true
                        deletingItems = itemIds
                    } else {
                        showDeleteMessage = true
                        deletingItem = ci
                    }
                } else {
                    showDeleteMessage = true
                    deletingItem = ci
                }
            } label: {
                Label(label, systemImage: "trash")
            }
        }

        private func itemsRange(_ currIndex: Int?, _ prevHidden: Int?) -> ClosedRange<Int>? {
            if let currIndex = currIndex,
               let prevHidden = prevHidden,
               prevHidden > currIndex {
                currIndex...prevHidden
            } else {
                nil
            }
        }

        private func moderateButton(_ ci: ChatItem, _ groupInfo: GroupInfo) -> Button<some View> {
            Button(role: .destructive) {
                AlertManager.shared.showAlert(Alert(
                    title: Text("Delete member message?"),
                    message: Text(
                        groupInfo.fullGroupPreferences.fullDelete.on
                        ? "The message will be deleted for all members."
                        : "The message will be marked as moderated for all members."
                    ),
                    primaryButton: .destructive(Text("Delete")) {
                        deletingItem = ci
                        deleteMessage(.cidmBroadcast, moderate: true)
                    },
                    secondaryButton: .cancel()
                ))
            } label: {
                Label(
                    NSLocalizedString("Moderate", comment: "chat item action"),
                    systemImage: "flag"
                )
            }
        }

        private func archiveReportButton(_ cItem: ChatItem) -> Button<some View> {
            Button {
                archivingReports = [cItem.id]
                showArchivingReports = true
            } label: {
                Label("Archive report", systemImage: "archivebox")
            }
        }

        private func revealButton(_ ci: ChatItem) -> Button<some View> {
            Button {
                withConditionalAnimation {
                    reveal(true)
                }
            } label: {
                Label(
                    NSLocalizedString("Reveal", comment: "chat item action"),
                    systemImage: "eye"
                )
            }
        }

        private func expandButton() -> Button<some View> {
            Button {
                withConditionalAnimation {
                    reveal(true)
                }
            } label: {
                Label(
                    NSLocalizedString("Expand", comment: "chat item action"),
                    systemImage: "arrow.up.and.line.horizontal.and.arrow.down"
                )
            }
        }

        private func shrinkButton() -> Button<some View> {
            Button {
                withConditionalAnimation {
                    reveal(false)
                }
            } label: {
                Label (
                    NSLocalizedString("Hide", comment: "chat item action"),
                    systemImage: "arrow.down.and.line.horizontal.and.arrow.up"
                )
            }
        }

        private func reportButton(_ ci: ChatItem) -> Button<some View> {
            Button(role: .destructive) {
                var buttons: [ActionSheet.Button] = ReportReason.supportedReasons.map { reason in
                    .default(Text(reason.text)) {
                        withAnimation {
                            if composeState.editing {
                                composeState = ComposeState(preview: .noPreview, contextItem: .reportedItem(chatItem: chatItem, reason: reason))
                            } else {
                                composeState = composeState.copy(preview: .noPreview, contextItem: .reportedItem(chatItem: chatItem, reason: reason))
                            }
                        }
                    }
                }

                buttons.append(.cancel())

                actionSheet = SomeActionSheet(
                    actionSheet: ActionSheet(
                        title: Text("Report reason?"),
                        buttons: buttons
                    ),
                    id: "reportChatMessage"
                )
            } label: {
                Label (
                    NSLocalizedString("Report", comment: "chat item action"),
                    systemImage: "flag"
                )
            }
        }

        var deleteMessagesTitle: LocalizedStringKey {
            let n = deletingItems.count
            return n == 1 ? "Delete message?" : "Delete \(n) messages?"
        }

        private func selectUnselectChatItem(select: Bool, _ ci: ChatItem) {
            selectedChatItems = selectedChatItems ?? []
            var itemIds: [Int64] = []
            if !revealed,
               let currIndex = m.getChatItemIndex(ci),
               let ciCategory = ci.mergeCategory {
                let (prevHidden, _) = m.getPrevShownChatItem(currIndex, ciCategory)
                if let range = itemsRange(currIndex, prevHidden) {
                    for i in range {
                        itemIds.append(ItemsModel.shared.reversedChatItems[i].id)
                    }
                } else {
                    itemIds.append(ci.id)
                }
            } else {
                itemIds.append(ci.id)
            }
            if select {
                if let sel = selectedChatItems {
                    selectedChatItems = sel.union(itemIds)
                }
            } else {
                itemIds.forEach { selectedChatItems?.remove($0) }
            }
        }

        private func deleteMessage(_ mode: CIDeleteMode, moderate: Bool) {
            logger.debug("ChatView deleteMessage")
            Task {
                logger.debug("ChatView deleteMessage: in Task")
                do {
                    if let di = deletingItem {
                        let r = if case .cidmBroadcast = mode,
                           moderate,
                           let (groupInfo, _) = di.memberToModerate(chat.chatInfo) {
                            try await apiDeleteMemberChatItems(
                                groupId: groupInfo.apiId,
                                itemIds: [di.id]
                            )
                        } else {
                            try await apiDeleteChatItems(
                                type: chat.chatInfo.chatType,
                                id: chat.chatInfo.apiId,
                                itemIds: [di.id],
                                mode: mode
                            )
                        }
                        if let itemDeletion = r.first {
                            await MainActor.run {
                                deletingItem = nil
                                if let toItem = itemDeletion.toChatItem {
                                    _ = m.upsertChatItem(chat.chatInfo, toItem.chatItem)
                                } else {
                                    m.removeChatItem(chat.chatInfo, itemDeletion.deletedChatItem.chatItem)
                                }
                                let deletedItem = itemDeletion.deletedChatItem.chatItem
                                if deletedItem.isActiveReport {
                                    m.decreaseGroupReportsCounter(chat.chatInfo.id)
                                }
                            }
                        }
                    }
                } catch {
                    logger.error("ChatView.deleteMessage error: \(error)")
                }
            }
        }

        @ViewBuilder private func contactReactionMenu(_ contact: Contact, _ r: CIReactionCount) -> some View {
            if !r.userReacted || r.totalReacted > 1 {
                Button { showChatInfoSheet = true } label: {
                    profileMenuItem(Text(contact.displayName), contact.image, radius: profileRadius)
                }
            }
            if r.userReacted {
                Button {} label: {
                    profileMenuItem(Text("you"), m.currentUser?.profile.image, radius: profileRadius)
                }
                .disabled(true)
            }
        }

        func goToItemInnerButton(_ alignStart: Bool, _ image: String, touchInProgress: Bool, _ onClick: @escaping () -> Void) -> some View {
            Image(systemName: image)
                .resizable()
                .frame(width: 13, height: 13)
                .padding([alignStart ? .trailing : .leading], 10)
                .tint(theme.colors.secondary.opacity(touchInProgress ? 1.0 : 0.4))
                .simultaneousGesture(TapGesture().onEnded(onClick))
        }

        @ViewBuilder
        func goToItemButton(_ alignStart: Bool) -> some View {
            let chatTypeApiIdMsgId = chatItem.meta.itemForwarded?.chatTypeApiIdMsgId
            if searchIsNotBlank {
                goToItemInnerButton(alignStart, "magnifyingglass", touchInProgress: touchInProgress) {
                    closeKeyboardAndRun {
                        ItemsModel.shared.loadOpenChatNoWait(chat.id, chatItem.id)
                    }
                }
            } else if let chatTypeApiIdMsgId {
                goToItemInnerButton(alignStart, "arrow.right", touchInProgress: touchInProgress) {
                    closeKeyboardAndRun {
                        let (chatType, apiId, msgId) = chatTypeApiIdMsgId
                        ItemsModel.shared.loadOpenChatNoWait("\(chatType.rawValue)\(apiId)", msgId)
                    }
                }
            }
        }

        private struct SelectedChatItem: View {
            @EnvironmentObject var theme: AppTheme
            var ciId: Int64
            @Binding var selectedChatItems: Set<Int64>?
            @State var checked: Bool = false
            var body: some View {
                Image(systemName: checked ? "checkmark.circle.fill" : "circle")
                    .resizable()
                    .foregroundColor(checked ? theme.colors.primary : Color(uiColor: .tertiaryLabel))
                    .frame(width: 24, height: 24)
                    .onAppear {
                        checked = selectedChatItems?.contains(ciId) == true
                    }
                    .onChange(of: selectedChatItems) { selected in
                        checked = selected?.contains(ciId) == true
                    }
            }
        }
    }
}

private func broadcastDeleteButtonText(_ chat: Chat) -> LocalizedStringKey {
    chat.chatInfo.featureEnabled(.fullDelete) ? "Delete for everyone" : "Mark deleted for everyone"
}

private func deleteMessages(_ chat: Chat, _ deletingItems: [Int64], _ mode: CIDeleteMode = .cidmInternal, moderate: Bool, _ onSuccess: @escaping () async -> Void = {}) {
    let itemIds = deletingItems
    if itemIds.count > 0 {
        let chatInfo = chat.chatInfo
        Task {
            do {
                let deletedItems = if case .cidmBroadcast = mode,
                    moderate,
                    case .group = chat.chatInfo {
                    try await apiDeleteMemberChatItems(
                        groupId: chatInfo.apiId,
                        itemIds: itemIds
                    )
                } else {
                    try await apiDeleteChatItems(
                        type: chatInfo.chatType,
                        id: chatInfo.apiId,
                        itemIds: itemIds,
                        mode: mode
                    )
                }

                await MainActor.run {
                    for di in deletedItems {
                        if let toItem = di.toChatItem {
                            _ = ChatModel.shared.upsertChatItem(chat.chatInfo, toItem.chatItem)
                        } else {
                            ChatModel.shared.removeChatItem(chatInfo, di.deletedChatItem.chatItem)
                        }
                        let deletedItem = di.deletedChatItem.chatItem
                        if deletedItem.isActiveReport {
                            ChatModel.shared.decreaseGroupReportsCounter(chat.chatInfo.id)
                        }
                    }
                }
                await onSuccess()
            } catch {
                logger.error("ChatView.deleteMessages error: \(error.localizedDescription)")
            }
        }
    }
}

func archiveReports(_ chatInfo: ChatInfo, _ itemIds: [Int64], _ forAll: Bool, _ onSuccess: @escaping () async -> Void = {}) {
    if itemIds.count > 0 {
        Task {
            do {
                let deleted = try await apiDeleteReceivedReports(
                    groupId: chatInfo.apiId,
                    itemIds: itemIds,
                    mode: forAll ? CIDeleteMode.cidmBroadcast : CIDeleteMode.cidmInternalMark
                )

                await MainActor.run {
                    for di in deleted {
                        if let toItem = di.toChatItem {
                            _ = ChatModel.shared.upsertChatItem(chatInfo, toItem.chatItem)
                        } else {
                            ChatModel.shared.removeChatItem(chatInfo, di.deletedChatItem.chatItem)
                        }
                        let deletedItem = di.deletedChatItem.chatItem
                        if deletedItem.isActiveReport {
                            ChatModel.shared.decreaseGroupReportsCounter(chatInfo.id)
                        }
                    }
                }
                await onSuccess()
            } catch {
                logger.error("ChatView.archiveReports error: \(error.localizedDescription)")
            }
        }
    }
}

private func buildTheme() -> AppTheme {
    if let cId = ChatModel.shared.chatId, let chat = ChatModel.shared.getChat(cId) {
        let perChatTheme = if case let .direct(contact) = chat.chatInfo {
            contact.uiThemes?.preferredMode(!AppTheme.shared.colors.isLight)
        } else if case let .group(groupInfo) = chat.chatInfo {
            groupInfo.uiThemes?.preferredMode(!AppTheme.shared.colors.isLight)
        } else {
            nil as ThemeModeOverride?
        }
        let overrides = if perChatTheme != nil {
            ThemeManager.currentColors(nil, perChatTheme, ChatModel.shared.currentUser?.uiThemes, themeOverridesDefault.get())
        } else {
            nil as ThemeManager.ActiveTheme?
        }
        let theme = overrides ?? CurrentColors
        return AppTheme(name: theme.name, base: theme.base, colors: theme.colors, appColors: theme.appColors, wallpaper: theme.wallpaper)
    } else {
        return AppTheme.shared
    }
}

struct ReactionContextMenu: View {
    @EnvironmentObject var m: ChatModel
    let groupInfo: GroupInfo
    var itemId: Int64
    var reactionCount: CIReactionCount
    @Binding var selectedMember: GMember?
    var profileRadius: CGFloat
    @State private var memberReactions: [MemberReaction] = []

    var body: some View {
        groupMemberReactionList()
            .task {
                await loadChatItemReaction()
            }
    }

    @ViewBuilder private func groupMemberReactionList() -> some View {
        if memberReactions.isEmpty {
            ForEach(Array(repeating: 0, count: reactionCount.totalReacted), id: \.self) { _ in
                textSpace
            }
        } else {
            ForEach(memberReactions, id: \.groupMember.groupMemberId) { mr in
                let mem = mr.groupMember
                let userMember = mem.groupMemberId == groupInfo.membership.groupMemberId
                Button {
                    if let member = m.getGroupMember(mem.groupMemberId) {
                        selectedMember = member
                    } else {
                        let member = GMember.init(mem)
                        m.groupMembers.append(member)
                        m.groupMembersIndexes[member.groupMemberId] = m.groupMembers.count - 1
                        selectedMember = member
                    }
                } label: {
                    profileMenuItem(Text(mem.displayName), mem.image, radius: profileRadius)
                }
                .disabled(userMember)
            }
        }
    }

    private func loadChatItemReaction() async {
        do {
            let memberReactions = try await apiGetReactionMembers(
                groupId: groupInfo.groupId,
                itemId: itemId,
                reaction: reactionCount.reaction
            )
            await MainActor.run {
                self.memberReactions = memberReactions
            }
        } catch let error {
            logger.error("apiGetReactionMembers error: \(responseError(error))")
        }
    }
}

func profileMenuItem(_ nameText: Text, _ image: String?, radius: CGFloat) -> some View {
    HStack {
        nameText
        if let image, let img = imageFromBase64(image) {
            Image(uiImage: maskToCustomShape(img, size: 30, radius: radius))
        } else {
            Image(systemName: "person.crop.circle")
        }
    }
}

func maskToCustomShape(_ image: UIImage, size: CGFloat, radius: CGFloat) -> UIImage {
    let path = Path { path in
        if radius >= 50 {
            path.addEllipse(in: CGRect(x: 0, y: 0, width: size, height: size))
        } else if radius <= 0 {
            path.addRect(CGRect(x: 0, y: 0, width: size, height: size))
        } else {
            let cornerRadius = size * CGFloat(radius) / 100
            path.addRoundedRect(
                in: CGRect(x: 0, y: 0, width: size, height: size),
                cornerSize: CGSize(width: cornerRadius, height: cornerRadius),
                style: .continuous
            )
        }
    }

    return UIGraphicsImageRenderer(size: CGSize(width: size, height: size)).image { context in
        context.cgContext.addPath(path.cgPath)
        context.cgContext.clip()
        let scale = size / max(image.size.width, image.size.height)
        let imageSize = CGSize(width: image.size.width * scale, height: image.size.height * scale)
        let imageOrigin = CGPoint(
            x: (size - imageSize.width) / 2,
            y: (size - imageSize.height) / 2
        )
        image.draw(in: CGRect(origin: imageOrigin, size: imageSize))
    }
}

struct ToggleNtfsButton: View {
    @ObservedObject var chat: Chat

    var body: some View {
        if let nextMode = chat.chatInfo.nextNtfMode {
            Button {
                toggleNotifications(chat, enableNtfs: nextMode)
            } label: {
                Label(nextMode.text(mentions: chat.chatInfo.hasMentions), systemImage: nextMode.icon)
            }
        }
    }
}

func toggleNotifications(_ chat: Chat, enableNtfs: MsgFilter) {
    var chatSettings = chat.chatInfo.chatSettings ?? ChatSettings.defaults
    chatSettings.enableNtfs = enableNtfs
    updateChatSettings(chat, chatSettings: chatSettings)
}

func toggleChatFavorite(_ chat: Chat, favorite: Bool) {
    var chatSettings = chat.chatInfo.chatSettings ?? ChatSettings.defaults
    chatSettings.favorite = favorite
    updateChatSettings(chat, chatSettings: chatSettings)
}

func updateChatSettings(_ chat: Chat, chatSettings: ChatSettings) {
    Task {
        do {
            try await apiSetChatSettings(type: chat.chatInfo.chatType, id: chat.chatInfo.apiId, chatSettings: chatSettings)
            await MainActor.run {
                let wasFavorite = chat.chatInfo.chatSettings?.favorite ?? false
                ChatTagsModel.shared.updateChatFavorite(favorite: chatSettings.favorite, wasFavorite: wasFavorite)
                let wasUnread = chat.unreadTag
                switch chat.chatInfo {
                case var .direct(contact):
                    contact.chatSettings = chatSettings
                    ChatModel.shared.updateContact(contact)
                case var .group(groupInfo):
                    groupInfo.chatSettings = chatSettings
                    ChatModel.shared.updateGroup(groupInfo)
                default: ()
                }
                ChatTagsModel.shared.updateChatTagRead(chat, wasUnread: wasUnread)
            }
        } catch let error {
            logger.error("apiSetChatSettings error \(responseError(error))")
        }
    }
}

struct ChatView_Previews: PreviewProvider {
    static var previews: some View {
        let chatModel = ChatModel()
        chatModel.chatId = "@1"
        ItemsModel.shared.reversedChatItems = [
            ChatItem.getSample(1, .directSnd, .now, "hello"),
            ChatItem.getSample(2, .directRcv, .now, "hi"),
            ChatItem.getSample(3, .directRcv, .now, "hi there"),
            ChatItem.getDeletedContentSample(4),
            ChatItem.getSample(5, .directRcv, .now, "hello again"),
            ChatItem.getSample(6, .directSnd, .now, "hi there!!!"),
            ChatItem.getSample(7, .directSnd, .now, "how are you?"),
            ChatItem.getSample(8, .directSnd, .now, "👍👍👍👍"),
            ChatItem.getSample(9, .directSnd, .now, "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.")
        ]
        @State var showChatInfo = false
        return ChatView(chat: Chat(chatInfo: ChatInfo.sampleData.direct, chatItems: []))
            .environmentObject(chatModel)
    }
}