Swiftgram/submodules/SettingsUI/Sources/Themes/ThemeGridSearchContentNode.swift

import Foundation
import UIKit
import AsyncDisplayKit
import Display
import SwiftSignalKit
import Postbox
import TelegramCore
import SyncCore
import TelegramPresentationData
import MergeLists
import AccountContext
import SearchUI
import ChatListSearchItemHeader
import WebSearchUI

enum WallpaperSearchColor: CaseIterable {
    case blue
    case red
    case orange
    case yellow
    case green
    case teal
    case purple
    case pink
    case brown
    case black
    case gray
    case white
    
    var string: String {
        switch self {
            case .blue:
                return "Blue"
            case .red:
                return "Red"
            case .orange:
                return "Orange"
            case .yellow:
                return "Yellow"
            case .green:
                return "Green"
            case .teal:
                return "Teal"
            case .purple:
                return "Purple"
            case .pink:
                return "Pink"
            case .brown:
                return "Brown"
            case .black:
                return "Black"
            case .gray:
                return "Gray"
            case .white:
                return "White"
        }
    }
    
    func localizedString(strings: PresentationStrings) -> String {
        switch self {
            case .blue:
                return strings.WallpaperSearch_ColorBlue
            case .red:
                return strings.WallpaperSearch_ColorRed
            case .orange:
                return strings.WallpaperSearch_ColorOrange
            case .yellow:
                return strings.WallpaperSearch_ColorYellow
            case .green:
                return strings.WallpaperSearch_ColorGreen
            case .teal:
                return strings.WallpaperSearch_ColorTeal
            case .purple:
                return strings.WallpaperSearch_ColorPurple
            case .pink:
                return strings.WallpaperSearch_ColorPink
            case .brown:
                return strings.WallpaperSearch_ColorBrown
            case .black:
                return strings.WallpaperSearch_ColorBlack
            case .gray:
                return strings.WallpaperSearch_ColorGray
            case .white:
                return strings.WallpaperSearch_ColorWhite
        }
    }
}

enum WallpaperSearchQuery: Equatable {
    case generic(String)
    case color(WallpaperSearchColor, String)
    
    var botQuery: String {
        switch self {
            case let .generic(query):
                return query
            case let .color(color, query):
                return "#color\(color.string) \(query)"
        }
    }
    
    var query: String {
        switch self {
            case let .generic(query), let .color(_, query):
                return query
        }
    }
    
    func updatedWithText(_ text: String) -> WallpaperSearchQuery {
        switch self {
            case .generic:
                return .generic(text)
            case let .color(color, _):
                return .color(color, text)
        }
    }
    
    func updatedWithColor(_ color: WallpaperSearchColor?) -> WallpaperSearchQuery {
        if let color = color {
            switch self {
                case let .generic(text):
                    return .color(color, text)
                case let .color(_, text):
                    return .color(color, text)
            }
        } else {
            switch self {
                case .generic:
                    return self
                case let .color(_, text):
                    return .generic(text)
            }
        }
    }
}

final class ThemeGridSearchInteraction {
    let openResult: (ChatContextResult) -> Void
    let selectColor: (WallpaperSearchColor) -> Void
    let setSearchQuery: (WallpaperSearchQuery) -> Void
    let deleteRecentQuery: (String) -> Void
    
    init(openResult: @escaping (ChatContextResult) -> Void, selectColor: @escaping (WallpaperSearchColor) -> Void, setSearchQuery: @escaping (WallpaperSearchQuery) -> Void, deleteRecentQuery: @escaping (String) -> Void) {
        self.openResult = openResult
        self.selectColor = selectColor
        self.setSearchQuery = setSearchQuery
        self.deleteRecentQuery = deleteRecentQuery
    }
}

private enum ThemeGridRecentEntryStableId: Hashable {
    case colors
    case query(String)
    
    static func ==(lhs: ThemeGridRecentEntryStableId, rhs: ThemeGridRecentEntryStableId) -> Bool {
        switch lhs {
            case .colors:
                if case .colors = rhs {
                    return true
                } else {
                    return false
                }
            case let .query(query):
                if case .query(query) = rhs {
                    return true
                } else {
                    return false
                }
        }
    }
    
    var hashValue: Int {
        switch self {
            case .colors:
                return 0
            case let .query(query):
                return query.hashValue
        }
    }
}

private enum ThemeGridRecentEntry: Comparable, Identifiable {
    case colors(PresentationTheme, PresentationStrings)
    case query(Int, String)
    
    var stableId: ThemeGridRecentEntryStableId {
        switch self {
            case .colors:
                return .colors
            case let .query(_, query):
                return .query(query)
        }
    }
    
    static func ==(lhs: ThemeGridRecentEntry, rhs: ThemeGridRecentEntry) -> Bool {
        switch lhs {
            case let .colors(lhsTheme, lhsStrings):
                if case let .colors(rhsTheme, rhsStrings) = rhs {
                    if lhsTheme !== rhsTheme {
                        return false
                    }
                    if lhsStrings !== rhsStrings {
                        return false
                    }
                    return true
                } else {
                    return false
                }
            case let .query(lhsIndex, lhsQuery):
                if case .query(lhsIndex, lhsQuery) = rhs {
                    return true
                } else {
                    return false
                }
        }
    }
    
    static func <(lhs: ThemeGridRecentEntry, rhs: ThemeGridRecentEntry) -> Bool {
        switch lhs {
            case .colors:
                return true
            case let .query(lhsIndex, _):
                switch rhs {
                    case .colors:
                        return false
                    case let .query(rhsIndex, _):
                        return lhsIndex <= rhsIndex
                }
        }
    }
    
    func item(account: Account, theme: PresentationTheme, strings: PresentationStrings, interaction: ThemeGridSearchInteraction, header: ListViewItemHeader) -> ListViewItem {
        switch self {
            case let .colors(theme, strings):
                return ThemeGridSearchColorsItem(account: account, theme: theme, strings: strings, colorSelected: { color in
                    interaction.selectColor(color)
                })
            case let .query(_, query):
                return WebSearchRecentQueryItem(account: account, theme: theme, strings: strings, query: query, tapped: { query in
                    interaction.setSearchQuery(.generic(query))
                }, deleted: { query in
                    interaction.deleteRecentQuery(query)
                }, header: header)
        }
    }
}

private struct ThemeGridSearchContainerRecentTransition {
    let deletions: [ListViewDeleteItem]
    let insertions: [ListViewInsertItem]
    let updates: [ListViewUpdateItem]
}

private struct ThemeGridSearchEntry: Comparable, Identifiable {
    let index: Int
    let result: ChatContextResult
    
    static func ==(lhs: ThemeGridSearchEntry, rhs: ThemeGridSearchEntry) -> Bool {
        return lhs.index == rhs.index && lhs.result == rhs.result
    }
    
    static func <(lhs: ThemeGridSearchEntry, rhs: ThemeGridSearchEntry) -> Bool {
        return lhs.index < rhs.index
    }
    
    var stableId: Int {
        return self.index
    }
    
    func item(account: Account, theme: PresentationTheme, interaction: ThemeGridSearchInteraction) -> ThemeGridSearchItem {
        return ThemeGridSearchItem(account: account, theme: theme, result: self.result, interaction: interaction)
    }
}

struct ThemeGridSearchContainerTransition {
    let deletions: [Int]
    let insertions: [GridNodeInsertItem]
    let updates: [GridNodeUpdateItem]
    let displayingResults: Bool
    let isEmpty: Bool
    let query: String
}

private func themeGridSearchContainerPreparedRecentTransition(from fromEntries: [ThemeGridRecentEntry], to toEntries: [ThemeGridRecentEntry], account: Account, theme: PresentationTheme, strings: PresentationStrings, interaction: ThemeGridSearchInteraction, header: ListViewItemHeader) -> ThemeGridSearchContainerRecentTransition {
    let (deleteIndices, indicesAndItems, updateIndices) = mergeListsStableWithUpdates(leftList: fromEntries, rightList: toEntries)
    
    let deletions = deleteIndices.map { ListViewDeleteItem(index: $0, directionHint: nil) }
    let insertions = indicesAndItems.map { ListViewInsertItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(account: account, theme: theme, strings: strings, interaction: interaction, header: header), directionHint: nil) }
    let updates = updateIndices.map { ListViewUpdateItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(account: account, theme: theme, strings: strings, interaction: interaction, header: header), directionHint: nil) }
    
    return ThemeGridSearchContainerRecentTransition(deletions: deletions, insertions: insertions, updates: updates)
}

private func themeGridSearchContainerPreparedTransition(from fromEntries: [ThemeGridSearchEntry], to toEntries: [ThemeGridSearchEntry], displayingResults: Bool, account: Account, theme: PresentationTheme, isEmpty: Bool, query: String, interaction: ThemeGridSearchInteraction) -> ThemeGridSearchContainerTransition {
    let (deleteIndices, indicesAndItems, updateIndices) = mergeListsStableWithUpdates(leftList: fromEntries, rightList: toEntries)

    let deletions = deleteIndices
    let insertions = indicesAndItems.map { GridNodeInsertItem(index: $0.0, item: $0.1.item(account: account, theme: theme, interaction: interaction), previousIndex: $0.2) }
    let updates = updateIndices.map { GridNodeUpdateItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(account: account, theme: theme, interaction: interaction)) }
    
    return ThemeGridSearchContainerTransition(deletions: deletions, insertions: insertions, updates: updates, displayingResults: displayingResults, isEmpty: isEmpty, query: query)
}

private struct ThemeGridSearchResult {
    let query: String
    let collection: ChatContextResultCollection
    let items: [ChatContextResult]
    let nextOffset: String?
}

private struct ThemeGridSearchContext {
    let result: ThemeGridSearchResult
    let loadMoreIndex: String?
}

final class ThemeGridSearchContentNode: SearchDisplayControllerContentNode {
    private let context: AccountContext
    
    private let recentListNode: ListView
    private let gridNode: GridNode
    private let dimNode: ASDisplayNode
    
    private let emptyResultsTitleNode: ImmediateTextNode
    private let emptyResultsTextNode: ImmediateTextNode
    
    private var enqueuedRecentTransitions: [(ThemeGridSearchContainerRecentTransition, Bool)] = []
    private var enqueuedTransitions: [(ThemeGridSearchContainerTransition, Bool)] = []
    private var validLayout: (ContainerViewLayout, CGFloat)?

    private var queryValue: WallpaperSearchQuery = .generic("")
    private let queryPromise: Promise<WallpaperSearchQuery>
    private let searchDisposable = MetaDisposable()
    private var recentDisposable: Disposable?
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    private let presentationDataPromise: Promise<PresentationData>
    
    private let _isSearching = ValuePromise<Bool>(false, ignoreRepeated: true)
    override var isSearching: Signal<Bool, NoError> {
        return self._isSearching.get()
    }
    
    init(context: AccountContext, openResult: @escaping (ChatContextResult) -> Void) {
        self.context = context
        self.queryPromise = Promise<WallpaperSearchQuery>(self.queryValue)
        
        self.presentationData = context.sharedContext.currentPresentationData.with { $0 }
        self.presentationDataPromise = Promise(self.presentationData)
        
        self.dimNode = ASDisplayNode()
        self.recentListNode = ListView()
        self.recentListNode.verticalScrollIndicatorColor = self.presentationData.theme.list.scrollIndicatorColor
        self.gridNode = GridNode()
        
        self.emptyResultsTitleNode = ImmediateTextNode()
        self.emptyResultsTitleNode.attributedText = NSAttributedString(string: self.presentationData.strings.SharedMedia_SearchNoResults, font: Font.semibold(17.0), textColor: self.presentationData.theme.list.freeTextColor)
        self.emptyResultsTitleNode.textAlignment = .center
        self.emptyResultsTitleNode.isHidden = true
        
        self.emptyResultsTextNode = ImmediateTextNode()
        self.emptyResultsTextNode.maximumNumberOfLines = 0
        self.emptyResultsTextNode.textAlignment = .center
        self.emptyResultsTextNode.isHidden = true
        
        super.init()
        
        self.dimNode.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        
        self.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        
        self.addSubnode(self.dimNode)
        self.addSubnode(self.recentListNode)
        self.addSubnode(self.gridNode)
        
        self.addSubnode(self.emptyResultsTitleNode)
        self.addSubnode(self.emptyResultsTextNode)
        
        let searchContext = Promise<ThemeGridSearchContext?>(nil)
        let searchContextValue = Atomic<ThemeGridSearchContext?>(value: nil)
        let updateSearchContext: ((ThemeGridSearchContext?) -> (ThemeGridSearchContext?, Bool)) -> Void = { f in
            var shouldUpdate = false
            let updated = searchContextValue.modify { current in
                let (u, s) = f(current)
                shouldUpdate = s
                if s {
                    return u
                } else {
                    return current
                }
            }
            if shouldUpdate {
                searchContext.set(.single(updated))
            }
        }
        
        self.gridNode.isHidden = true
        self.gridNode.visibleItemsUpdated = { visibleItems in
            if let bottom = visibleItems.bottom {
                if let context = searchContextValue.with({ $0 }), bottom.0 >= context.result.items.count - 8 {
                    updateSearchContext { previous in
                        guard let previous = previous else {
                            return (nil, false)
                        }
                        if previous.loadMoreIndex != nil {
                            return (previous, false)
                        }
                        guard let _ = previous.result.items.last else {
                            return (previous, false)
                        }
                        return (ThemeGridSearchContext(result: previous.result, loadMoreIndex: previous.result.nextOffset), true)
                    }
                }
            }
        }
        self.recentListNode.isHidden = false
        
        let previousSearchItems = Atomic<[ThemeGridSearchEntry]?>(value: nil)
        
        let interaction = ThemeGridSearchInteraction(openResult: { [weak self] result in
            openResult(result)
            if let strongSelf = self {
                strongSelf.dismissInput?()
                
                let query = strongSelf.queryValue.query
                if !query.isEmpty {
                    let _ = addRecentWallpaperSearchQuery(postbox: strongSelf.context.account.postbox, string: query).start()
                }
            }
        }, selectColor: { [weak self] color in
            self?.updateQuery({ $0.updatedWithColor(color) }, updateInterface: true)
        }, setSearchQuery: { [weak self] query in
            self?.dismissInput?()
            self?.updateQuery({ _ in
                return query
            }, updateInterface: true)
        }, deleteRecentQuery: { query in
            let _ = removeRecentWallpaperSearchQuery(postbox: context.account.postbox, string: query).start()
        })
        
        let configuration = self.context.account.postbox.transaction { transaction -> SearchBotsConfiguration in
            return currentSearchBotsConfiguration(transaction: transaction)
        }
        
        let foundItems = self.queryPromise.get()
        |> mapToSignal { query -> Signal<([ThemeGridSearchEntry], Bool)?, NoError> in
            let query = query.botQuery
            guard !query.isEmpty else {
                return .single(nil)
            }
            
            let wallpaperQuery = "#wallpaper \(query)"
            updateSearchContext { _ in
                return (nil, true)
            }
            
            return .single(([], true))
            |> then(
                configuration
                |> mapToSignal { configuration -> Signal<Peer?, NoError> in
                    guard let name = configuration.imageBotUsername else {
                        return .single(nil)
                    }
                    return resolvePeerByName(account: context.account, name: name)
                    |> mapToSignal { peerId -> Signal<Peer?, NoError> in
                        if let peerId = peerId {
                            return context.account.postbox.loadedPeerWithId(peerId)
                            |> map { peer -> Peer? in
                                return peer
                            }
                            |> take(1)
                        } else {
                            return .single(nil)
                        }
                    }
                }
                |> mapToSignal { peer -> Signal<([ThemeGridSearchEntry], Bool)?, NoError> in
                    if let user = peer as? TelegramUser, let botInfo = user.botInfo, let _ = botInfo.inlinePlaceholder {
                        let loadMore = searchContext.get()
                        |> mapToSignal { searchContext -> Signal<([ThemeGridSearchEntry], Bool)?, NoError> in
                            if let searchContext = searchContext {
                                if let _ = searchContext.loadMoreIndex, let nextOffset = searchContext.result.nextOffset {
                                    let collection = searchContext.result.collection
                                    let geoPoint = collection.geoPoint.flatMap { geoPoint -> (Double, Double) in
                                        return (geoPoint.latitude, geoPoint.longitude)
                                    }
                                    return requestChatContextResults(account: self.context.account, botId: collection.botId, peerId: collection.peerId, query: searchContext.result.query, location: .single(geoPoint), offset: nextOffset)
                                    |> map { results -> ChatContextResultCollection? in
                                        return results?.results
                                    }
                                    |> `catch` { error -> Signal<ChatContextResultCollection?, NoError> in
                                        return .single(nil)
                                    }
                                    |> map { nextResults -> (ChatContextResultCollection, String?) in
                                        var results: [ChatContextResult] = []
                                        var existingIds = Set<String>()
                                        for result in searchContext.result.items {
                                            results.append(result)
                                            existingIds.insert(result.id)
                                        }
                                        var nextOffset: String?
                                        if let nextResults = nextResults {
                                            for result in nextResults.results {
                                                if !existingIds.contains(result.id) {
                                                    results.append(result)
                                                    existingIds.insert(result.id)
                                                }
                                            }
                                            if let newNextOffset = nextResults.nextOffset, !newNextOffset.isEmpty {
                                                nextOffset = newNextOffset
                                            }
                                        }
                                        let merged = ChatContextResultCollection(botId: collection.botId, peerId: collection.peerId, query: collection.query, geoPoint: collection.geoPoint, queryId: nextResults?.queryId ?? collection.queryId, nextOffset: nextOffset ?? "", presentation: collection.presentation, switchPeer: collection.switchPeer, results: results, cacheTimeout: collection.cacheTimeout)
                                        return (merged, nextOffset)
                                    }
                                    |> mapToSignal { newCollection, nextOffset -> Signal<([ThemeGridSearchEntry], Bool)?, NoError> in
                                        updateSearchContext { previous in
                                            return (ThemeGridSearchContext(result: ThemeGridSearchResult(query: searchContext.result.query, collection: newCollection, items: newCollection.results, nextOffset: nextOffset), loadMoreIndex: nil), true)
                                        }
                                        return .complete()
                                    }
                                } else {
                                    var entries: [ThemeGridSearchEntry] = []
                                    var i = 0
                                    for result in searchContext.result.items {
                                        entries.append(ThemeGridSearchEntry(index: i, result: result))
                                        i += 1
                                    }
                                    return .single((entries, false))
                                }
                            } else {
                                return .complete()
                            }
                        }
                        
                        
                        return (.complete() |> delay(0.1, queue: Queue.concurrentDefaultQueue()))
                        |> then(
                            requestContextResults(account: context.account, botId: user.id, query: wallpaperQuery, peerId: context.account.peerId, limit: 16)
                            |> map { results -> ChatContextResultCollection? in
                                return results?.results
                            }
                            |> map { collection -> ([ThemeGridSearchEntry], Bool)? in
                                guard let collection = collection else {
                                    return nil
                                }
                                var entries: [ThemeGridSearchEntry] = []
                                var i = 0
                                for result in collection.results {
                                    entries.append(ThemeGridSearchEntry(index: i, result: result))
                                    i += 1
                                }
                                updateSearchContext { _ in
                                    return (ThemeGridSearchContext(result: ThemeGridSearchResult(query: wallpaperQuery, collection: collection, items: collection.results, nextOffset: collection.nextOffset), loadMoreIndex: nil), true)
                                }
                                return (entries, false)
                            }
                            |> delay(0.2, queue: Queue.concurrentDefaultQueue())
                            |> then(loadMore)
                        )
                    } else {
                        return .single(nil)
                    }
                }
            )
        }
        
        let previousRecentItems = Atomic<[ThemeGridRecentEntry]?>(value: nil)
        self.recentDisposable = (combineLatest(wallpaperSearchRecentQueries(postbox: self.context.account.postbox), self.presentationDataPromise.get())
        |> deliverOnMainQueue).start(next: { [weak self] queries, presentationData in
            if let strongSelf = self {
                var entries: [ThemeGridRecentEntry] = []
                
                entries.append(.colors(presentationData.theme, presentationData.strings))
                for i in 0 ..< queries.count {
                    entries.append(.query(i, queries[i]))
                }
                
                let header = ChatListSearchItemHeader(type: .recentPeers, theme: presentationData.theme, strings: presentationData.strings, actionTitle: presentationData.strings.WebSearch_RecentSectionClear, action: {
                    _ = clearRecentWallpaperSearchQueries(postbox: strongSelf.context.account.postbox).start()
                })
                
                let previousEntries = previousRecentItems.swap(entries)
                let transition = themeGridSearchContainerPreparedRecentTransition(from: previousEntries ?? [], to: entries, account: context.account, theme: presentationData.theme, strings: presentationData.strings, interaction: interaction, header: header)
                strongSelf.enqueueRecentTransition(transition, firstTime: previousEntries == nil)
            }
        })
        
        self.searchDisposable.set((combineLatest(foundItems, self.presentationDataPromise.get(), self.queryPromise.get())
        |> deliverOnMainQueue).start(next: { [weak self] entriesAndFlags, presentationData, query in
            if let strongSelf = self {
                strongSelf._isSearching.set(entriesAndFlags?.1 ?? false)
                
                let previousEntries = previousSearchItems.swap(entriesAndFlags?.0)
                
                var isEmpty = false
                if let entriesAndFlags = entriesAndFlags {
                    isEmpty = entriesAndFlags.0.isEmpty && !entriesAndFlags.1
                }
                
                let firstTime = previousEntries == nil
                let transition = themeGridSearchContainerPreparedTransition(from: previousEntries ?? [], to: entriesAndFlags?.0 ?? [], displayingResults: entriesAndFlags?.0 != nil, account: context.account, theme: presentationData.theme, isEmpty: isEmpty, query: query.query, interaction: interaction)
                strongSelf.enqueueTransition(transition, firstTime: firstTime)
            }
        }))
        
        self.presentationDataDisposable = (context.sharedContext.presentationData
        |> deliverOnMainQueue).start(next: { [weak self] presentationData in
            if let strongSelf = self {
                let previousTheme = strongSelf.presentationData.theme
            
                strongSelf.presentationData = presentationData
                strongSelf.presentationDataPromise.set(.single(presentationData))
                
                if previousTheme !== presentationData.theme {
                    strongSelf.updateTheme(theme: presentationData.theme)
                }
            }
        })
        
        self.recentListNode.beganInteractiveDragging = { [weak self] in
            self?.dismissInput?()
        }
        
        self.gridNode.scrollingInitiated = { [weak self] in
            self?.dismissInput?()
        }
    }
    
    override func didLoad() {
        super.didLoad()
        self.dimNode.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.dimTapGesture(_:))))
    }
    
    @objc func dimTapGesture(_ recognizer: UITapGestureRecognizer) {
        if case .ended = recognizer.state {
            self.cancel?()
        }
    }
    
    deinit {
        self.searchDisposable.dispose()
        self.recentDisposable?.dispose()
        self.presentationDataDisposable?.dispose()
    }
    
    private func updateTheme(theme: PresentationTheme) {
        self.backgroundColor = theme.chatList.backgroundColor
        self.dimNode.backgroundColor = theme.chatList.backgroundColor
        self.recentListNode.verticalScrollIndicatorColor = theme.list.scrollIndicatorColor
    }
    
    private func updateQuery(_ f: (WallpaperSearchQuery) -> (WallpaperSearchQuery), updateInterface: Bool = false) {
        let query = f(self.queryValue)
        if query != self.queryValue {
            self.queryValue = query
            self.queryPromise.set(.single(query))
            
            if updateInterface {
                let prefix: NSAttributedString?
                let text: String
                let placeholder: String
                switch query {
                    case let .generic(query):
                        prefix = nil
                        text = query
                        placeholder = self.presentationData.strings.Wallpaper_Search
                    case let .color(color, query):
                        let prefixString = NSMutableAttributedString()
                        prefixString.append(NSAttributedString(string: self.presentationData.strings.WallpaperSearch_ColorPrefix, font: Font.regular(17.0), textColor: self.presentationData.theme.rootController.navigationSearchBar.inputTextColor))
                        prefixString.append(NSAttributedString(string: "\(color.localizedString(strings: self.presentationData.strings)) ", font: Font.regular(17.0), textColor: self.presentationData.theme.rootController.navigationSearchBar.accentColor))
                        prefix = prefixString
                        text = query
                        placeholder = self.presentationData.strings.Wallpaper_SearchShort
                }
                self.setQuery?(prefix, text)
                self.setPlaceholder?(placeholder)
            }
        }
    }
    
    override func searchTextUpdated(text: String) {
        self.updateQuery({ $0.updatedWithText(text) })
    }
    
    override func searchTextClearPrefix() {
        self.updateQuery({ $0.updatedWithColor(nil) }, updateInterface: true)
    }
    
    private func enqueueRecentTransition(_ transition: ThemeGridSearchContainerRecentTransition, firstTime: Bool) {
        self.enqueuedRecentTransitions.append((transition, firstTime))
        
        if self.validLayout != nil {
            while !self.enqueuedRecentTransitions.isEmpty {
                self.dequeueRecentTransition()
            }
        }
    }
    
    private func dequeueRecentTransition() {
        if let (transition, firstTime) = self.enqueuedRecentTransitions.first {
            self.enqueuedRecentTransitions.remove(at: 0)
            
            var options = ListViewDeleteAndInsertOptions()
            if firstTime {
                options.insert(.PreferSynchronousDrawing)
            } else {
                options.insert(.AnimateInsertion)
            }
            
            self.recentListNode.transaction(deleteIndices: transition.deletions, insertIndicesAndItems: transition.insertions, updateIndicesAndItems: transition.updates, options: options, updateSizeAndInsets: nil, updateOpaqueState: nil, completion: { _ in
            })
        }
    }
    
    private func enqueueTransition(_ transition: ThemeGridSearchContainerTransition, firstTime: Bool) {
        self.enqueuedTransitions.append((transition, firstTime))
        
        if self.validLayout != nil {
            while !self.enqueuedTransitions.isEmpty {
                self.dequeueTransition()
            }
        }
    }
    
    private func dequeueTransition() {
        if let (transition, _) = self.enqueuedTransitions.first {
            self.enqueuedTransitions.remove(at: 0)
            
            let displayingResults = transition.displayingResults
            self.gridNode.transaction(GridNodeTransaction(deleteItems: transition.deletions, insertItems: transition.insertions, updateItems: transition.updates, scrollToItem: nil, updateLayout: nil, itemTransition: .immediate, stationaryItems: .none, updateFirstIndexInSectionOffset: nil), completion: { [weak self] _ in
                if let strongSelf = self {
                    strongSelf.gridNode.isHidden = !displayingResults
                    strongSelf.recentListNode.isHidden = displayingResults
                    strongSelf.dimNode.isHidden = displayingResults
                    strongSelf.backgroundColor = strongSelf.presentationData.theme.chatList.backgroundColor
                    
                    strongSelf.emptyResultsTextNode.attributedText = NSAttributedString(string: strongSelf.presentationData.strings.WebSearch_SearchNoResultsDescription(transition.query).0, font: Font.regular(15.0), textColor: strongSelf.presentationData.theme.list.freeTextColor)
                    
                    let emptyResults = displayingResults && transition.isEmpty
                    strongSelf.emptyResultsTitleNode.isHidden = !emptyResults
                    strongSelf.emptyResultsTextNode.isHidden = !emptyResults
                    
                    if let (layout, navigationBarHeight) = strongSelf.validLayout {
                        strongSelf.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: .immediate)
                    }
                }
            })
        }
    }
    
    override func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
        
        let hadValidLayout = self.validLayout != nil
        self.validLayout = (layout, navigationBarHeight)
        
        let minSpacing: CGFloat = 8.0
        let referenceImageSize: CGSize
        let screenWidth = min(layout.size.width, layout.size.height)
        if screenWidth >= 375.0 {
            referenceImageSize = CGSize(width: 108.0, height: 230.0)
        } else {
            referenceImageSize = CGSize(width: 91.0, height: 161.0)
        }
        let imageCount = Int((layout.size.width - minSpacing * 2.0) / (referenceImageSize.width + minSpacing))
        let imageSize = referenceImageSize.aspectFilled(CGSize(width: floor((layout.size.width - CGFloat(imageCount + 1) * minSpacing) / CGFloat(imageCount)), height: referenceImageSize.height))
        let spacing = floor((layout.size.width - CGFloat(imageCount) * imageSize.width) / CGFloat(imageCount + 1))
        
        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)))
        
        let (duration, curve) = listViewAnimationDurationAndCurve(transition: transition)
        
        self.recentListNode.frame = CGRect(origin: CGPoint(), size: layout.size)
        self.recentListNode.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous], scrollToItem: nil, updateSizeAndInsets: ListViewUpdateSizeAndInsets(size: layout.size, insets: UIEdgeInsets(top: navigationBarHeight, left: layout.safeInsets.left, bottom: layout.insets(options: [.input]).bottom, right: layout.safeInsets.right), duration: duration, curve: curve), stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
        
        self.gridNode.frame = CGRect(x: 0.0, y: 0.0, width: layout.size.width, height: layout.size.height)
        self.gridNode.transaction(GridNodeTransaction(deleteItems: [], insertItems: [], updateItems: [], scrollToItem: nil, updateLayout: GridNodeUpdateLayout(layout: GridNodeLayout(size: layout.size, insets: UIEdgeInsets(top: navigationBarHeight + spacing, left: layout.safeInsets.left, bottom: layout.insets(options: [.input]).bottom, right: layout.safeInsets.right), preloadSize: 300.0, type: .fixed(itemSize: imageSize, fillWidth: nil, lineSpacing: spacing, itemSpacing: nil)), transition: transition), itemTransition: .immediate, stationaryItems: .none, updateFirstIndexInSectionOffset: nil), completion: { _ in })
        
        let padding: CGFloat = 16.0
        let emptyTitleSize = self.emptyResultsTitleNode.updateLayout(CGSize(width: layout.size.width - layout.safeInsets.left - layout.safeInsets.right - padding * 2.0, height: CGFloat.greatestFiniteMagnitude))
        let emptyTextSize = self.emptyResultsTextNode.updateLayout(CGSize(width: layout.size.width - layout.safeInsets.left - layout.safeInsets.right - padding * 2.0, height: CGFloat.greatestFiniteMagnitude))
        
        let insets = layout.insets(options: [.input])
        let emptyTextSpacing: CGFloat = 8.0
        let emptyTotalHeight = emptyTitleSize.height + emptyTextSize.height + emptyTextSpacing
        let emptyTitleY = navigationBarHeight + floorToScreenPixels((layout.size.height - navigationBarHeight - max(insets.bottom, layout.intrinsicInsets.bottom) - emptyTotalHeight) / 2.0)
        
        transition.updateFrame(node: self.emptyResultsTitleNode, frame: CGRect(origin: CGPoint(x: layout.safeInsets.left + padding + (layout.size.width - layout.safeInsets.left - layout.safeInsets.right - padding * 2.0 - emptyTitleSize.width) / 2.0, y: emptyTitleY), size: emptyTitleSize))
        transition.updateFrame(node: self.emptyResultsTextNode, frame: CGRect(origin: CGPoint(x: layout.safeInsets.left + padding + (layout.size.width - layout.safeInsets.left - layout.safeInsets.right - padding * 2.0 - emptyTextSize.width) / 2.0, y: emptyTitleY + emptyTitleSize.height + emptyTextSpacing), size: emptyTextSize))
        
        if !hadValidLayout {
            while !self.enqueuedRecentTransitions.isEmpty {
                self.dequeueRecentTransition()
            }
            while !self.enqueuedTransitions.isEmpty {
                self.dequeueTransition()
            }
        }
    }
    
    private func clearRecentSearch() {
        let _ = (clearRecentlySearchedPeers(postbox: self.context.account.postbox) |> deliverOnMainQueue).start()
    }
    
    override func scrollToTop() {
        if !self.gridNode.isHidden {
            self.gridNode.transaction(GridNodeTransaction(deleteItems: [], insertItems: [], updateItems: [], scrollToItem: GridNodeScrollToItem(index: 0, position: .top(0.0), transition: .animated(duration: 0.25, curve: .easeInOut), directionHint: .up, adjustForSection: true, adjustForTopInset: true), updateLayout: nil, itemTransition: .immediate, stationaryItems: .none, updateFirstIndexInSectionOffset: nil), completion: { _ in })
        } else {
            self.recentListNode.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous, .LowLatency], scrollToItem: ListViewScrollToItem(index: 0, position: .top(0.0), animated: true, curve: .Default(duration: nil), directionHint: .Up), updateSizeAndInsets: nil, stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
        }
    }
}