import Foundation
import UIKit
import Display
import AsyncDisplayKit
import TelegramCore
import SwiftSignalKit
import TelegramPresentationData
import MergeLists
import ItemListUI
import PresentationDataUtils
import AccountContext
import SearchBarNode
import SearchUI
import ChatListSearchItemHeader
import ContactsPeerItem

//Xcode 16
#if canImport(ContactProvider)
extension NavigationBarSearchContentNode: @retroactive ItemListControllerSearchNavigationContentNode {
    public func activate() {
    }
    
    public func deactivate() {
    }
    
    public func setQueryUpdated(_ f: @escaping (String) -> Void) {
    }
}
#else
extension NavigationBarSearchContentNode: ItemListControllerSearchNavigationContentNode {
    public func activate() {
    }
    
    public func deactivate() {
    }
    
    public func setQueryUpdated(_ f: @escaping (String) -> Void) {
    }
}
#endif

final class OldChannelsSearchItem: ItemListControllerSearch {
    let context: AccountContext
    let theme: PresentationTheme
    let placeholder: String
    let activated: Bool
    let updateActivated: (Bool) -> Void
    let peers: Signal<[InactiveChannel], NoError>
    let selectedPeerIds: Signal<Set<EnginePeer.Id>, NoError>
    let togglePeer: (EnginePeer.Id) -> Void
    
    private var updateActivity: ((Bool) -> Void)?
    private var activity: ValuePromise<Bool> = ValuePromise(ignoreRepeated: false)
    private let activityDisposable = MetaDisposable()
    
    init(context: AccountContext, theme: PresentationTheme, placeholder: String, activated: Bool, updateActivated: @escaping (Bool) -> Void, peers: Signal<[InactiveChannel], NoError>, selectedPeerIds: Signal<Set<EnginePeer.Id>, NoError>, togglePeer: @escaping (EnginePeer.Id) -> Void) {
        self.context = context
        self.theme = theme
        self.placeholder = placeholder
        self.activated = activated
        self.updateActivated = updateActivated
        self.peers = peers
        self.selectedPeerIds = selectedPeerIds
        self.togglePeer = togglePeer
    }
    
    deinit {
        self.activityDisposable.dispose()
    }
    
    func isEqual(to: ItemListControllerSearch) -> Bool {
        if let to = to as? OldChannelsSearchItem {
            if self.context !== to.context || self.theme !== to.theme || self.placeholder != to.placeholder || self.activated != to.activated {
                return false
            }
            return true
        } else {
            return false
        }
    }
    
    func titleContentNode(current: (NavigationBarContentNode & ItemListControllerSearchNavigationContentNode)?) -> NavigationBarContentNode & ItemListControllerSearchNavigationContentNode {
        let updateActivated: (Bool) -> Void = self.updateActivated
        if let current = current as? NavigationBarSearchContentNode {
            current.updateThemeAndPlaceholder(theme: self.theme, placeholder: self.placeholder)
            return current
        } else {
            let presentationData = self.context.sharedContext.currentPresentationData.with { $0 }
            return NavigationBarSearchContentNode(theme: presentationData.theme, placeholder: presentationData.strings.Settings_Search, activate: {
                updateActivated(true)
            })
        }
    }
    
    func node(current: ItemListControllerSearchNode?, titleContentNode: (NavigationBarContentNode & ItemListControllerSearchNavigationContentNode)?) -> ItemListControllerSearchNode {
        let updateActivated: (Bool) -> Void = self.updateActivated
        
        if let current = current as? OldChannelsSearchItemNode, let titleContentNode = titleContentNode as? NavigationBarSearchContentNode {
            current.updatePresentationData(self.context.sharedContext.currentPresentationData.with { $0 })
            if current.isSearching != self.activated {
                if self.activated {
                    current.activateSearch(placeholderNode: titleContentNode.placeholderNode)
                } else {
                    current.deactivateSearch(placeholderNode: titleContentNode.placeholderNode)
                }
            }
            return current
        } else {
            return OldChannelsSearchItemNode(context: self.context, cancel: {
                updateActivated(false)
            }, peers: self.peers, selectedPeerIds: self.selectedPeerIds, togglePeer: self.togglePeer)
        }
    }
}

private final class OldChannelsSearchInteraction {
    let togglePeer: (EnginePeer.Id) -> Void
    
    init(togglePeer: @escaping (EnginePeer.Id) -> Void) {
        self.togglePeer = togglePeer
    }
}

private enum OldChannelsSearchEntry: Comparable, Identifiable {
    case peer(Int, InactiveChannel, Bool)
    
    var stableId: EnginePeer.Id {
        switch self {
        case let .peer(_, peer, _):
            return peer.peer.id
        }
    }
    
    private func index() -> Int {
        switch self {
        case let .peer(index, _, _):
            return index
        }
    }
    
    static func <(lhs: OldChannelsSearchEntry, rhs: OldChannelsSearchEntry) -> Bool {
        return lhs.index() < rhs.index()
    }
    
    static func ==(lhs: OldChannelsSearchEntry, rhs: OldChannelsSearchEntry) -> Bool {
        if case let .peer(index, peer, isSelected) = lhs {
            if case .peer(index, peer, isSelected) = rhs {
                return true
            }
        }
        return false
    }
    
    func item(context: AccountContext, presentationData: ItemListPresentationData, interaction: OldChannelsSearchInteraction)  -> ListViewItem {
        switch self {
        case let .peer(_, peer, selected):
            return ContactsPeerItem(presentationData: presentationData, style: .plain, sortOrder: .firstLast, displayOrder: .firstLast, context: context, peerMode: .peer, peer: .peer(peer: EnginePeer(peer.peer), chatPeer: EnginePeer(peer.peer)), status: .custom(string: NSAttributedString(string: localizedOldChannelDate(peer: peer, strings: presentationData.strings)), multiline: false, isActive: false, icon: nil), badge: nil, enabled: true, selection: ContactsPeerItemSelection.selectable(selected: selected), editing: ContactsPeerItemEditing(editable: false, editing: false, revealed: false), options: [], actionIcon: .none, index: nil, header: nil, action: { _ in
                interaction.togglePeer(peer.peer.id)
            }, setPeerIdWithRevealedOptions: nil, deletePeer: nil, itemHighlighting: nil, contextAction: nil)
        }
    }
}

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

private func preparedOldChannelsSearchContainerTransition(presentationData: ItemListPresentationData, from fromEntries: [OldChannelsSearchEntry], to toEntries: [OldChannelsSearchEntry], context: AccountContext, interaction: OldChannelsSearchInteraction, isSearching: Bool, forceUpdate: Bool) -> OldChannelsSearchContainerTransition {
    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(context: context, presentationData: presentationData, interaction: interaction), directionHint: nil) }
    let updates = updateIndices.map { ListViewUpdateItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(context: context, presentationData: presentationData, interaction: interaction), directionHint: nil) }
    
    return OldChannelsSearchContainerTransition(deletions: deletions, insertions: insertions, updates: updates, isSearching: isSearching)
}

private final class OldChannelsSearchContainerNode: SearchDisplayControllerContentNode {
    private let listNode: ListView
    
    private var enqueuedTransitions: [OldChannelsSearchContainerTransition] = []
    private var hasValidLayout = false
    
    private let searchQuery = Promise<String?>()
    private let searchDisposable = MetaDisposable()
    
    private var recentDisposable: Disposable?
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    private let presentationDataPromise: Promise<PresentationData>
    
    init(context: AccountContext, peers: Signal<[InactiveChannel], NoError>, selectedPeerIds: Signal<Set<EnginePeer.Id>, NoError>, togglePeer: @escaping (EnginePeer.Id) -> Void) {
        let presentationData = context.sharedContext.currentPresentationData.with { $0 }
        self.presentationData = presentationData
        self.presentationDataPromise = Promise(self.presentationData)
        
        self.listNode = ListView()
        self.listNode.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        self.listNode.isHidden = true
        self.listNode.accessibilityPageScrolledString = { row, count in
            return presentationData.strings.VoiceOver_ScrollStatus(row, count).string
        }
        
        super.init()
        
        self.backgroundColor = self.presentationData.theme.chatList.backgroundColor
        
        self.addSubnode(self.listNode)
        
        let interaction = OldChannelsSearchInteraction(togglePeer: { [weak self] peerId in
            togglePeer(peerId)
            
            if let strongSelf = self {
                strongSelf.listNode.forEachItemNode { itemNode in
                    if let itemNode = itemNode as? ContactsPeerItemNode, let peer = itemNode.chatPeer, peer.id == peerId {
                        strongSelf.listNode.ensureItemNodeVisible(itemNode, curve: .Spring(duration: 0.3))
                    }
                }
            }
        })
        
        let queryAndFoundItems: Signal<(String, [OldChannelsSearchEntry])?, NoError> = combineLatest(self.searchQuery.get(), peers, selectedPeerIds)
        |> mapToSignal { query, peers, selectedPeerIds -> Signal<(String, [OldChannelsSearchEntry])?, NoError> in
            if let query = query, !query.isEmpty {
                var results: [OldChannelsSearchEntry] = []
                let normalizedQuery = query.lowercased()
                for peer in peers {
                    if peer.peer.indexName.matchesByTokens(normalizedQuery) {
                        results.append(.peer(results.count, peer, selectedPeerIds.contains(peer.peer.id)))
                    }
                }
                return .single((query, results))
            } else {
                return .single(nil)
            }
        }
        
        let previousEntriesHolder = Atomic<([OldChannelsSearchEntry], PresentationTheme, PresentationStrings)?>(value: nil)
        self.searchDisposable.set(combineLatest(queue: .mainQueue(), queryAndFoundItems, self.presentationDataPromise.get()).start(next: { [weak self] queryAndFoundItems, presentationData in
            guard let strongSelf = self else {
                return
            }
            var currentQuery: String?
            var entries: [OldChannelsSearchEntry] = []
            if let (query, items) = queryAndFoundItems {
                currentQuery = query
                for item in items {
                    entries.append(item)
                }
            }
            
            if !entries.isEmpty || currentQuery == nil {
                let previousEntriesAndPresentationData = previousEntriesHolder.swap((entries, presentationData.theme, presentationData.strings))
                let transition = preparedOldChannelsSearchContainerTransition(presentationData: ItemListPresentationData(presentationData), from: previousEntriesAndPresentationData?.0 ?? [], to: entries, context: context, interaction: interaction, isSearching: queryAndFoundItems != nil, forceUpdate: previousEntriesAndPresentationData?.1 !== presentationData.theme || previousEntriesAndPresentationData?.2 !== presentationData.strings)
                strongSelf.enqueueTransition(transition)
            }
        }))
        
        self.presentationDataDisposable = (context.sharedContext.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.presentationDataPromise.set(.single(presentationData))
                }
            }
        })
        
        self.listNode.beganInteractiveDragging = { [weak self] _ in
            self?.dismissInput?()
        }
    }
    
    deinit {
        self.searchDisposable.dispose()
        self.recentDisposable?.dispose()
        self.presentationDataDisposable?.dispose()
    }
    
    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: OldChannelsSearchContainerTransition) {
        self.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(.Synchronous)
            options.insert(.PreferSynchronousDrawing)
            options.insert(.PreferSynchronousResourceLoading)
            
            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
            })
        }
    }
    
    override func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
                
        let (duration, curve) = listViewAnimationDurationAndCurve(transition: transition)
        
        var insets = layout.insets(options: [.input])
        insets.top += navigationBarHeight
        insets.left += layout.safeInsets.left
        insets.right += layout.safeInsets.right
        
        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: insets, duration: duration, curve: curve), stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
        
        if !self.hasValidLayout {
            self.hasValidLayout = true
            while !self.enqueuedTransitions.isEmpty {
                self.dequeueTransition()
            }
        }
    }
    
    override func scrollToTop() {
        let listNodeToScroll: ListView = self.listNode
        listNodeToScroll.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 })
    }
    
    @objc func dimTapGesture(_ recognizer: UITapGestureRecognizer) {
        if case .ended = recognizer.state {
            self.cancel?()
        }
    }
}

private final class OldChannelsSearchItemNode: ItemListControllerSearchNode {
    private let context: AccountContext
    private var presentationData: PresentationData
    private var containerLayout: (ContainerViewLayout, CGFloat)?
    private var searchDisplayController: SearchDisplayController?
    
    var cancel: () -> Void
    private let peers: Signal<[InactiveChannel], NoError>
    private let selectedPeerIds: Signal<Set<EnginePeer.Id>, NoError>
    private let togglePeer: (EnginePeer.Id) -> Void
    
    init(context: AccountContext, cancel: @escaping () -> Void, peers: Signal<[InactiveChannel], NoError>, selectedPeerIds: Signal<Set<EnginePeer.Id>, NoError>, togglePeer: @escaping (EnginePeer.Id) -> Void) {
        self.context = context
        self.presentationData = context.sharedContext.currentPresentationData.with { $0 }
        self.cancel = cancel
        self.peers = peers
        self.selectedPeerIds = selectedPeerIds
        self.togglePeer = togglePeer
        
        super.init()
    }
    
    func updatePresentationData(_ presentationData: PresentationData) {
        self.presentationData = presentationData
        self.searchDisplayController?.updatePresentationData(presentationData)
    }
    
    func activateSearch(placeholderNode: SearchBarPlaceholderNode) {
        guard let (containerLayout, navigationBarHeight) = self.containerLayout, self.searchDisplayController == nil else {
            return
        }
        
        self.searchDisplayController = SearchDisplayController(presentationData: self.presentationData, contentNode: OldChannelsSearchContainerNode(context: self.context, peers: self.peers, selectedPeerIds: self.selectedPeerIds, togglePeer: self.togglePeer), cancel: { [weak self] in
            self?.cancel()
        })
        
        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.addSubnode(subnode)
                }
            }
        }, placeholder: placeholderNode)
    }
    
    func deactivateSearch(placeholderNode: SearchBarPlaceholderNode) {
        if let searchDisplayController = self.searchDisplayController {
            searchDisplayController.deactivate(placeholder: placeholderNode)
            self.searchDisplayController = nil
        }
    }
    
    var isSearching: Bool {
        return self.searchDisplayController != nil
    }
    
    override func scrollToTop() {
        self.searchDisplayController?.contentNode.scrollToTop()
    }
    
    override func queryUpdated(_ query: String) {
    }
    
    override func updateLayout(layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        self.containerLayout = (layout, navigationBarHeight)
        
        if let searchDisplayController = self.searchDisplayController {
            searchDisplayController.containerLayoutUpdated(layout, navigationBarHeight: navigationBarHeight, transition: transition)
        }
    }
    
    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        if let searchDisplayController = self.searchDisplayController, let result = searchDisplayController.contentNode.hitTest(self.view.convert(point, to: searchDisplayController.contentNode.view), with: event) {
            return result
        }
        
        return super.hitTest(point, with: event)
    }
}