Swiftgram/TelegramUI/LocalizationListControllerNode.swift

import Foundation
import Display
import AsyncDisplayKit
import Postbox
import TelegramCore
import SwiftSignalKit

private enum LanguageListSection: ItemListSectionId {
    case official
    case unofficial
}

private enum LanguageListEntryId: Hashable {
    case search
    case localization(String)
}

private enum LanguageListEntryType {
    case official
    case unofficial
}

private enum LanguageListEntry: Comparable, Identifiable {
    case localization(index: Int, info: LocalizationInfo, type: LanguageListEntryType, selected: Bool, activity: Bool, revealed: Bool, editing: Bool)
    
    var stableId: LanguageListEntryId {
        switch self {
            case let .localization(_, info, _, _, _, _, _):
                return .localization(info.languageCode)
        }
    }
    
    private func index() -> Int {
        switch self {
            case let .localization(index, _, _, _, _, _, _):
                return index
        }
    }
    
    static func <(lhs: LanguageListEntry, rhs: LanguageListEntry) -> Bool {
       return lhs.index() < rhs.index()
    }
    
    func item(theme: PresentationTheme, strings: PresentationStrings, searchMode: Bool, openSearch: @escaping () -> Void, selectLocalization: @escaping (LocalizationInfo) -> Void, setItemWithRevealedOptions: @escaping (String?, String?) -> Void, removeItem: @escaping (String) -> Void) -> ListViewItem {
        switch self {
            case let .localization(_, info, type, selected, activity, revealed, editing):
                return LocalizationListItem(theme: theme, strings: strings, id: info.languageCode, title: info.title, subtitle: info.localizedTitle, checked: selected, activity: activity, editing: LocalizationListItemEditing(editable: !selected && !searchMode && !info.isOfficial, editing: editing, revealed: !selected && revealed, reorderable: false), sectionId: type == .official ? LanguageListSection.official.rawValue : LanguageListSection.unofficial.rawValue, alwaysPlain: searchMode, action: {
                    selectLocalization(info)
                }, setItemWithRevealedOptions: setItemWithRevealedOptions, removeItem: removeItem)
        }
    }
}

private struct LocalizationListSearchContainerTransition {
    let deletions: [ListViewDeleteItem]
    let insertions: [ListViewInsertItem]
    let updates: [ListViewUpdateItem]
    let isSearching: Bool
}

private func preparedLanguageListSearchContainerTransition(theme: PresentationTheme, strings: PresentationStrings, from fromEntries: [LanguageListEntry], to toEntries: [LanguageListEntry], selectLocalization: @escaping (LocalizationInfo) -> Void, isSearching: Bool, forceUpdate: Bool) -> LocalizationListSearchContainerTransition {
    let (deleteIndices, indicesAndItems, updateIndices) = mergeListsStableWithUpdates(leftList: fromEntries, rightList: toEntries, allUpdated: forceUpdate)
    
    let deletions = deleteIndices.map { ListViewDeleteItem(index: $0, directionHint: nil) }
    let insertions = indicesAndItems.map { ListViewInsertItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(theme: theme, strings: strings, searchMode: true, openSearch: {}, selectLocalization: selectLocalization, setItemWithRevealedOptions: { _, _ in }, removeItem: { _ in }), directionHint: nil) }
    let updates = updateIndices.map { ListViewUpdateItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(theme: theme, strings: strings, searchMode: true, openSearch: {}, selectLocalization: selectLocalization, setItemWithRevealedOptions: { _, _ in }, removeItem: { _ in }), directionHint: nil) }
    
    return LocalizationListSearchContainerTransition(deletions: deletions, insertions: insertions, updates: updates, isSearching: isSearching)
}

private final class LocalizationListSearchContainerNode: SearchDisplayControllerContentNode {
    private let dimNode: ASDisplayNode
    private let listNode: ListView
    
    private var enqueuedTransitions: [LocalizationListSearchContainerTransition] = []
    private var hasValidLayout = false
    
    private let searchQuery = Promise<String?>()
    private let searchDisposable = MetaDisposable()
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    private let themeAndStringsPromise: Promise<(PresentationTheme, PresentationStrings)>
    
    init(context: AccountContext, listState: LocalizationListState, selectLocalization: @escaping (LocalizationInfo) -> Void, applyingCode: Signal<String?, NoError>) {
        self.presentationData = context.currentPresentationData.with { $0 }
        
        self.themeAndStringsPromise = Promise((self.presentationData.theme, self.presentationData.strings))
        
        self.dimNode = ASDisplayNode()
        self.dimNode.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        
        self.listNode = ListView()
        
        super.init()
        
        self.listNode.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        self.listNode.isHidden = true
        
        self.addSubnode(self.dimNode)
        self.addSubnode(self.listNode)
        
        let foundItems = self.searchQuery.get()
        |> mapToSignal { query -> Signal<[LocalizationInfo]?, NoError> in
            if let query = query, !query.isEmpty {
                let normalizedQuery = query.lowercased()
                var result: [LocalizationInfo] = []
                var uniqueIds = Set<String>()
                for info in listState.availableSavedLocalizations + listState.availableOfficialLocalizations {
                    if info.title.lowercased().hasPrefix(normalizedQuery) || info.localizedTitle.lowercased().hasPrefix(normalizedQuery) {
                        if uniqueIds.contains(info.languageCode) {
                           continue
                        }
                        uniqueIds.insert(info.languageCode)
                        result.append(info)
                    }
                }
                return .single(result)
            } else {
                return .single(nil)
            }
        }
        
        let previousEntriesHolder = Atomic<([LanguageListEntry], PresentationTheme, PresentationStrings)?>(value: nil)
        self.searchDisposable.set(combineLatest(queue: .mainQueue(), foundItems, self.themeAndStringsPromise.get(), applyingCode).start(next: { [weak self] items, themeAndStrings, applyingCode in
            guard let strongSelf = self else {
                return
            }
            var entries: [LanguageListEntry] = []
            if let items = items {
                for item in items {
                    entries.append(.localization(index: entries.count, info: item, type: .official, selected: themeAndStrings.1.primaryComponent.languageCode == item.languageCode, activity: applyingCode == item.languageCode, revealed: false, editing: false))
                }
            }
            let previousEntriesAndPresentationData = previousEntriesHolder.swap((entries, themeAndStrings.0, themeAndStrings.1))
            let transition = preparedLanguageListSearchContainerTransition(theme: themeAndStrings.0, strings: themeAndStrings.1, from: previousEntriesAndPresentationData?.0 ?? [], to: entries, selectLocalization: selectLocalization, isSearching: items != nil, forceUpdate: previousEntriesAndPresentationData?.1 !== themeAndStrings.0 || previousEntriesAndPresentationData?.2 !== themeAndStrings.1)
            strongSelf.enqueueTransition(transition)
        }))
        
        self.presentationDataDisposable = (context.presentationData
            |> deliverOnMainQueue).start(next: { [weak self] presentationData in
                if let strongSelf = self {
                    let previousTheme = strongSelf.presentationData.theme
                    let previousStrings = strongSelf.presentationData.strings
                    
                    strongSelf.presentationData = presentationData
                    
                    if previousTheme !== presentationData.theme || previousStrings !== presentationData.strings {
                        strongSelf.updateThemeAndStrings(theme: presentationData.theme, strings: presentationData.strings)
                        strongSelf.themeAndStringsPromise.set(.single((presentationData.theme, presentationData.strings)))
                    }
                }
            })
        
        self.listNode.beganInteractiveDragging = { [weak self] in
            self?.dismissInput?()
        }
    }
    
    deinit {
        self.searchDisposable.dispose()
        self.presentationDataDisposable?.dispose()
    }
    
    override func didLoad() {
        super.didLoad()
        
        self.dimNode.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.dimTapGesture(_:))))
    }
    
    func updateThemeAndStrings(theme: PresentationTheme, strings: PresentationStrings) {
        self.listNode.backgroundColor = theme.chatList.backgroundColor
    }
    
    override func searchTextUpdated(text: String) {
        if text.isEmpty {
            self.searchQuery.set(.single(nil))
        } else {
            self.searchQuery.set(.single(text))
        }
    }
    
    private func enqueueTransition(_ transition: LocalizationListSearchContainerTransition) {
        enqueuedTransitions.append(transition)
        
        if self.hasValidLayout {
            while !self.enqueuedTransitions.isEmpty {
                self.dequeueTransition()
            }
        }
    }
    
    private func dequeueTransition() {
        if let transition = self.enqueuedTransitions.first {
            self.enqueuedTransitions.remove(at: 0)
            
            var options = ListViewDeleteAndInsertOptions()
            options.insert(.PreferSynchronousDrawing)
            
            let isSearching = transition.isSearching
            self.listNode.transaction(deleteIndices: transition.deletions, insertIndicesAndItems: transition.insertions, updateIndicesAndItems: transition.updates, options: options, updateSizeAndInsets: nil, updateOpaqueState: nil, completion: { [weak self] _ in
                self?.listNode.isHidden = !isSearching
                self?.dimNode.isHidden = isSearching
            })
        }
    }
    
    override func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
        
        let topInset = navigationBarHeight
        transition.updateFrame(node: self.dimNode, frame: CGRect(origin: CGPoint(x: 0.0, y: topInset), size: CGSize(width: layout.size.width, height: layout.size.height - topInset)))
        
        var duration: Double = 0.0
        var curve: UInt = 0
        switch transition {
            case .immediate:
                break
            case let .animated(animationDuration, animationCurve):
                duration = animationDuration
                switch animationCurve {
                    case .easeInOut:
                        break
                    case .spring:
                        curve = 7
                }
        }
        
        let listViewCurve: ListViewAnimationCurve
        if curve == 7 {
            listViewCurve = .Spring(duration: duration)
        } else {
            listViewCurve = .Default(duration: nil)
        }
        
        self.listNode.frame = CGRect(origin: CGPoint(), size: layout.size)
        self.listNode.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous], scrollToItem: nil, updateSizeAndInsets: ListViewUpdateSizeAndInsets(size: layout.size, insets: UIEdgeInsets(top: navigationBarHeight, left: 0.0, bottom: layout.insets(options: [.input]).bottom, right: 0.0), duration: duration, curve: listViewCurve), stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
        
        if !hasValidLayout {
            hasValidLayout = true
            while !self.enqueuedTransitions.isEmpty {
                self.dequeueTransition()
            }
        }
    }
    
    @objc func dimTapGesture(_ recognizer: UITapGestureRecognizer) {
        if case .ended = recognizer.state {
            self.cancel?()
        }
    }
}

private struct LanguageListNodeTransition {
    let deletions: [ListViewDeleteItem]
    let insertions: [ListViewInsertItem]
    let updates: [ListViewUpdateItem]
    let firstTime: Bool
    let animated: Bool
}

private func preparedLanguageListNodeTransition(theme: PresentationTheme, strings: PresentationStrings, from fromEntries: [LanguageListEntry], to toEntries: [LanguageListEntry], openSearch: @escaping () -> Void, selectLocalization: @escaping (LocalizationInfo) -> Void, setItemWithRevealedOptions: @escaping (String?, String?) -> Void, removeItem: @escaping (String) -> Void, firstTime: Bool, forceUpdate: Bool, animated: Bool) -> LanguageListNodeTransition {
    let (deleteIndices, indicesAndItems, updateIndices) = mergeListsStableWithUpdates(leftList: fromEntries, rightList: toEntries, allUpdated: forceUpdate)
    
    let deletions = deleteIndices.map { ListViewDeleteItem(index: $0, directionHint: nil) }
    let insertions = indicesAndItems.map { ListViewInsertItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(theme: theme, strings: strings, searchMode: false, openSearch: openSearch, selectLocalization: selectLocalization, setItemWithRevealedOptions: setItemWithRevealedOptions, removeItem: removeItem), directionHint: nil) }
    let updates = updateIndices.map { ListViewUpdateItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(theme: theme, strings: strings, searchMode: false, openSearch: openSearch, selectLocalization: selectLocalization, setItemWithRevealedOptions: setItemWithRevealedOptions, removeItem: removeItem), directionHint: nil) }
    
    return LanguageListNodeTransition(deletions: deletions, insertions: insertions, updates: updates, firstTime: firstTime, animated: animated)
}

final class LocalizationListControllerNode: ViewControllerTracingNode {
    private let context: AccountContext
    private var presentationData: PresentationData
    private let navigationBar: NavigationBar
    private let requestActivateSearch: () -> Void
    private let requestDeactivateSearch: () -> Void
    private let present: (ViewController, Any?) -> Void
    
    private var didSetReady = false
    let _ready = ValuePromise<Bool>()
    
    private var containerLayout: (ContainerViewLayout, CGFloat)?
    let listNode: ListView
    private var queuedTransitions: [LanguageListNodeTransition] = []
    
    private var searchDisplayController: SearchDisplayController?
    
    private let presentationDataValue = Promise<(PresentationTheme, PresentationStrings)>()
    private var updatedDisposable: Disposable?
    private var listDisposable: Disposable?
    private let applyDisposable = MetaDisposable()
    
    private var currentListState: LocalizationListState?
    private let applyingCode = Promise<String?>(nil)
    private let isEditing = ValuePromise<Bool>(false)
    private var isEditingValue: Bool = false {
        didSet {
            self.isEditing.set(self.isEditingValue)
        }
    }
    
    init(context: AccountContext, presentationData: PresentationData, navigationBar: NavigationBar, requestActivateSearch: @escaping () -> Void, requestDeactivateSearch: @escaping () -> Void, updateCanStartEditing: @escaping (Bool?) -> Void, present: @escaping (ViewController, Any?) -> Void) {
        self.context = context
        self.presentationData = presentationData
        self.presentationDataValue.set(.single((presentationData.theme, presentationData.strings)))
        self.navigationBar = navigationBar
        self.requestActivateSearch = requestActivateSearch
        self.requestDeactivateSearch = requestDeactivateSearch
        self.present = present

        self.listNode = ListView()
        self.listNode.keepTopItemOverscrollBackground = ListViewKeepTopItemOverscrollBackground(color: presentationData.theme.chatList.backgroundColor, direction: true)
        
        super.init()
        
        self.backgroundColor = presentationData.theme.list.blocksBackgroundColor
        self.addSubnode(self.listNode)
        
        let openSearch: () -> Void = {
            requestActivateSearch()
        }
        
        let revealedCode = Promise<String?>(nil)
        var revealedCodeValue: String?
        let setItemWithRevealedOptions: (String?, String?) -> Void = { id, fromId in
            if (id == nil && fromId == revealedCodeValue) || (id != nil && fromId == nil) {
                revealedCodeValue = id
                revealedCode.set(.single(id))
            }
        }
        
        let removeItem: (String) -> Void = { id in
            let _ = (context.account.postbox.transaction { transaction -> LocalizationInfo? in
                removeSavedLocalization(transaction: transaction, languageCode: id)
                if let settings = transaction.getPreferencesEntry(key: PreferencesKeys.localizationSettings) as? LocalizationSettings, let state = transaction.getPreferencesEntry(key: PreferencesKeys.localizationListState) as? LocalizationListState {
                    if settings.primaryComponent.languageCode == id {
                        for item in state.availableOfficialLocalizations {
                            if item.languageCode == "en" {
                                return item
                            }
                        }
                    }
                }
                return nil
            }
            |> deliverOnMainQueue).start(next: { [weak self] info in
                if revealedCodeValue == id {
                    revealedCodeValue = nil
                    revealedCode.set(.single(nil))
                }
                if let info = info {
                    self?.selectLocalization(info)
                }
            })
        }
        
        let preferencesKey: PostboxViewKey = .preferences(keys: Set([PreferencesKeys.localizationListState, PreferencesKeys.localizationSettings]))
        let previousEntriesHolder = Atomic<([LanguageListEntry], PresentationTheme, PresentationStrings)?>(value: nil)
        self.listDisposable = combineLatest(queue: .mainQueue(), context.account.postbox.combinedView(keys: [preferencesKey]), self.presentationDataValue.get(), self.applyingCode.get(), revealedCode.get(), self.isEditing.get()).start(next: { [weak self] view, presentationData, applyingCode, revealedCode, isEditing in
            guard let strongSelf = self else {
                return
            }
            
            var entries: [LanguageListEntry] = []
            var activeLanguageCode: String?
            if let localizationSettings = (view.views[preferencesKey] as? PreferencesView)?.values[PreferencesKeys.localizationSettings] as? LocalizationSettings {
                activeLanguageCode = localizationSettings.primaryComponent.languageCode
            }
            var existingIds = Set<String>()
            if let localizationListState = (view.views[preferencesKey] as? PreferencesView)?.values[PreferencesKeys.localizationListState] as? LocalizationListState, !localizationListState.availableOfficialLocalizations.isEmpty {
                strongSelf.currentListState = localizationListState
                
                let availableSavedLocalizations = localizationListState.availableSavedLocalizations.filter({ info in !localizationListState.availableOfficialLocalizations.contains(where: { $0.languageCode == info.languageCode }) })
                if availableSavedLocalizations.isEmpty {
                    updateCanStartEditing(nil)
                } else {
                    updateCanStartEditing(isEditing)
                }
                if !availableSavedLocalizations.isEmpty {
                    for info in availableSavedLocalizations {
                        if existingIds.contains(info.languageCode) {
                            continue
                        }
                        existingIds.insert(info.languageCode)
                        entries.append(.localization(index: entries.count, info: info, type: .unofficial, selected: info.languageCode == activeLanguageCode, activity: applyingCode == info.languageCode, revealed: revealedCode == info.languageCode, editing: isEditing))
                    }
                }
                for info in localizationListState.availableOfficialLocalizations {
                    if existingIds.contains(info.languageCode) {
                        continue
                    }
                    existingIds.insert(info.languageCode)
                    entries.append(.localization(index: entries.count, info: info, type: .official, selected: info.languageCode == activeLanguageCode, activity: applyingCode == info.languageCode, revealed: revealedCode == info.languageCode, editing: false))
                }
            }
            let previousEntriesAndPresentationData = previousEntriesHolder.swap((entries, presentationData.0, presentationData.1))
            let transition = preparedLanguageListNodeTransition(theme: presentationData.0, strings: presentationData.1, from: previousEntriesAndPresentationData?.0 ?? [], to: entries, openSearch: openSearch, selectLocalization: { [weak self] info in self?.selectLocalization(info) }, setItemWithRevealedOptions: setItemWithRevealedOptions, removeItem: removeItem, firstTime: previousEntriesAndPresentationData == nil, forceUpdate: previousEntriesAndPresentationData?.1 !== presentationData.0 || previousEntriesAndPresentationData?.2 !== presentationData.1, animated: (previousEntriesAndPresentationData?.0.count ?? 0) >= entries.count)
            strongSelf.enqueueTransition(transition)
        })
        self.updatedDisposable = synchronizedLocalizationListState(postbox: context.account.postbox, network: context.account.network).start()
    }
    
    deinit {
        self.listDisposable?.dispose()
        self.updatedDisposable?.dispose()
        self.applyDisposable.dispose()
    }
    
    func updatePresentationData(_ presentationData: PresentationData) {
        self.presentationData = presentationData
        self.presentationDataValue.set(.single((presentationData.theme, presentationData.strings)))
        self.backgroundColor = presentationData.theme.list.blocksBackgroundColor
        self.listNode.keepTopItemOverscrollBackground = ListViewKeepTopItemOverscrollBackground(color: presentationData.theme.chatList.backgroundColor, direction: true)
        self.searchDisplayController?.updatePresentationData(presentationData)
    }
    
    func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        let hadValidLayout = self.containerLayout != nil
        self.containerLayout = (layout, navigationBarHeight)
        
        var listInsets = layout.insets(options: [.input])
        listInsets.top += navigationBarHeight
        listInsets.left += layout.safeInsets.left
        listInsets.right += layout.safeInsets.right
        if let searchDisplayController = self.searchDisplayController {
            searchDisplayController.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
        }
        
        self.listNode.bounds = CGRect(x: 0.0, y: 0.0, width: layout.size.width, height: layout.size.height)
        self.listNode.position = CGPoint(x: layout.size.width / 2.0, y: layout.size.height / 2.0)
        
        var duration: Double = 0.0
        var curve: UInt = 0
        switch transition {
            case .immediate:
                break
            case let .animated(animationDuration, animationCurve):
                duration = animationDuration
                switch animationCurve {
                    case .easeInOut:
                        break
                    case .spring:
                        curve = 7
                }
        }
        
        let listViewCurve: ListViewAnimationCurve
        if curve == 7 {
            listViewCurve = .Spring(duration: duration)
        } else {
            listViewCurve = .Default(duration: duration)
        }
        
        let updateSizeAndInsets = ListViewUpdateSizeAndInsets(size: layout.size, insets: listInsets, duration: duration, curve: listViewCurve)
        
        self.listNode.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous, .LowLatency], scrollToItem: nil, updateSizeAndInsets: updateSizeAndInsets, stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
        
        if !hadValidLayout {
            self.dequeueTransitions()
        }
    }
    
    private func enqueueTransition(_ transition: LanguageListNodeTransition) {
        self.queuedTransitions.append(transition)
        
        if self.containerLayout != nil {
            self.dequeueTransitions()
        }
    }
    
    private func dequeueTransitions() {
        if self.containerLayout != nil {
            while !self.queuedTransitions.isEmpty {
                let transition = self.queuedTransitions.removeFirst()
                
                var options = ListViewDeleteAndInsertOptions()
                if transition.firstTime {
                    options.insert(.Synchronous)
                    options.insert(.LowLatency)
                } else if transition.animated {
                    options.insert(.AnimateInsertion)
                }
                self.listNode.transaction(deleteIndices: transition.deletions, insertIndicesAndItems: transition.insertions, updateIndicesAndItems: transition.updates, options: options, updateOpaqueState: nil, completion: { [weak self] _ in
                    if let strongSelf = self {
                        if !strongSelf.didSetReady {
                            strongSelf.didSetReady = true
                            strongSelf._ready.set(true)
                        }
                    }
                })
            }
        }
    }
    
    private func selectLocalization(_ info: LocalizationInfo) -> Void {
        let applyImpl: () -> Void = { [weak self] in
            guard let strongSelf = self else {
                return
            }
            strongSelf.applyingCode.set(.single(info.languageCode))
            strongSelf.applyDisposable.set((downloadAndApplyLocalization(postbox: strongSelf.context.account.postbox, network: strongSelf.context.account.network, languageCode: info.languageCode)
                |> deliverOnMainQueue).start(completed: {
                    self?.applyingCode.set(.single(nil))
                }))
        }
        if info.isOfficial {
            applyImpl()
            return
        }
        let controller = ActionSheetController(presentationTheme: presentationData.theme)
        let dismissAction: () -> Void = { [weak controller] in
            controller?.dismissAnimated()
        }
        var items: [ActionSheetItem] = []
        items.append(ActionSheetTextItem(title: info.localizedTitle))
        if self.presentationData.strings.primaryComponent.languageCode != info.languageCode {
            items.append(ActionSheetButtonItem(title: presentationData.strings.ApplyLanguage_ChangeLanguageAction, action: {
                dismissAction()
                applyImpl()
            }))
        }
        items.append(ActionSheetButtonItem(title: presentationData.strings.Conversation_ContextMenuShare, action: { [weak self] in
            dismissAction()
            guard let strongSelf = self else {
                return
            }
            let shareController = ShareController(context: strongSelf.context, subject: .url("https://t.me/setlanguage/\(info.languageCode)"))
            strongSelf.present(shareController, nil)
        }))
        controller.setItemGroups([
            ActionSheetItemGroup(items: items),
            ActionSheetItemGroup(items: [ActionSheetButtonItem(title: presentationData.strings.Common_Cancel, action: { dismissAction() })])
        ])
        self.view.window?.endEditing(true)
        self.present(controller, nil)
    }
    
    func toggleEditing() {
        self.isEditingValue = !self.isEditingValue
    }
    
    func activateSearch(placeholderNode: SearchBarPlaceholderNode) {
        guard let (containerLayout, navigationBarHeight) = self.containerLayout, self.searchDisplayController == nil else {
            return
        }
        
        self.searchDisplayController = SearchDisplayController(presentationData: self.presentationData, contentNode: LocalizationListSearchContainerNode(context: self.context, listState: self.currentListState ?? LocalizationListState.defaultSettings, selectLocalization: { [weak self] info in self?.selectLocalization(info) }, applyingCode: self.applyingCode.get()), cancel: { [weak self] in
            self?.requestDeactivateSearch()
        })
        
        self.searchDisplayController?.containerLayoutUpdated(containerLayout, navigationBarHeight: navigationBarHeight, transition: .immediate)
        self.searchDisplayController?.activate(insertSubnode: { [weak self, weak placeholderNode] subnode, isSearchBar in
            if let strongSelf = self, let strongPlaceholderNode = placeholderNode {
                if isSearchBar {
                    strongPlaceholderNode.supernode?.insertSubnode(subnode, aboveSubnode: strongPlaceholderNode)
                } else {
                    strongSelf.insertSubnode(subnode, belowSubnode: strongSelf.navigationBar)
                }
            }
        }, placeholder: placeholderNode)
    }
    
    func deactivateSearch(placeholderNode: SearchBarPlaceholderNode) {
        if let searchDisplayController = self.searchDisplayController {
            searchDisplayController.deactivate(placeholder: placeholderNode)
            self.searchDisplayController = nil
        }
    }
    
    func scrollToTop() {
        self.listNode.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous, .LowLatency], scrollToItem: ListViewScrollToItem(index: 0, position: .top(0.0), animated: true, curve: .Default(duration: 0.3), directionHint: .Up), updateSizeAndInsets: nil, stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
    }
}