import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import TelegramPresentationData
import TelegramUIPreferences
import TelegramVoip
import TelegramAudio
import AccountContext
import Postbox
import TelegramCore
import SyncCore
import ItemListPeerItem
import MergeLists
import ItemListUI
import AppBundle
import RadialStatusNode

private final class VoiceChatControllerTitleView: UIView {
    private var theme: PresentationTheme
    
    private let titleNode: ASTextNode
    private let infoNode: ASTextNode
    
    init(theme: PresentationTheme) {
        self.theme = theme
        
        self.titleNode = ASTextNode()
        self.titleNode.displaysAsynchronously = false
        self.titleNode.maximumNumberOfLines = 1
        self.titleNode.truncationMode = .byTruncatingTail
        self.titleNode.isOpaque = false
        
        self.infoNode = ASTextNode()
        self.infoNode.displaysAsynchronously = false
        self.infoNode.maximumNumberOfLines = 1
        self.infoNode.truncationMode = .byTruncatingTail
        self.infoNode.isOpaque = false
        
        super.init(frame: CGRect())
        
        self.addSubnode(self.titleNode)
        self.addSubnode(self.infoNode)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func set(title: String, subtitle: String) {
        self.titleNode.attributedText = NSAttributedString(string: title, font: Font.medium(17.0), textColor: .white)
        self.infoNode.attributedText = NSAttributedString(string: subtitle, font: Font.regular(13.0), textColor: UIColor.white.withAlphaComponent(0.5))
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        let size = self.bounds.size
        
        if size.height > 40.0 {
            let titleSize = self.titleNode.measure(size)
            let infoSize = self.infoNode.measure(size)
            let titleInfoSpacing: CGFloat = 0.0
            
            let combinedHeight = titleSize.height + infoSize.height + titleInfoSpacing
            
            self.titleNode.frame = CGRect(origin: CGPoint(x: floor((size.width - titleSize.width) / 2.0), y: floor((size.height - combinedHeight) / 2.0)), size: titleSize)
            self.infoNode.frame = CGRect(origin: CGPoint(x: floor((size.width - infoSize.width) / 2.0), y: floor((size.height - combinedHeight) / 2.0) + titleSize.height + titleInfoSpacing), size: infoSize)
        } else {
            let titleSize = self.titleNode.measure(CGSize(width: floor(size.width / 2.0), height: size.height))
            let infoSize = self.infoNode.measure(CGSize(width: floor(size.width / 2.0), height: size.height))
            
            let titleInfoSpacing: CGFloat = 8.0
            let combinedWidth = titleSize.width + infoSize.width + titleInfoSpacing
            
            self.titleNode.frame = CGRect(origin: CGPoint(x: floor((size.width - combinedWidth) / 2.0), y: floor((size.height - titleSize.height) / 2.0)), size: titleSize)
            self.infoNode.frame = CGRect(origin: CGPoint(x: floor((size.width - combinedWidth) / 2.0 + titleSize.width + titleInfoSpacing), y: floor((size.height - infoSize.height) / 2.0)), size: infoSize)
        }
    }
}

private final class VoiceChatActionButton: HighlightTrackingButtonNode {
    private let backgroundNode: ASImageNode
    private let foregroundNode: ASImageNode
    
    private var validSize: CGSize?
    
    init() {
        self.backgroundNode = ASImageNode()
        self.foregroundNode = ASImageNode()
        
        self.foregroundNode.image = UIImage(bundleImageName: "Call/VoiceChatMicOff")
        
        super.init()
        
        self.addSubnode(self.backgroundNode)
        self.addSubnode(self.foregroundNode)
    }
    
    func updateLayout(size: CGSize) {
        if self.validSize != size {
            self.validSize = size
            
            self.backgroundNode.image = generateFilledCircleImage(diameter: size.width, color: UIColor(rgb: 0x1C1C1E))
        }
        self.backgroundNode.frame = CGRect(origin: CGPoint(), size: size)
        
        if let image = self.foregroundNode.image {
            self.foregroundNode.frame = CGRect(origin: CGPoint(x: floor((size.width - image.size.width) / 2.0), y: floor((size.height - image.size.height) / 2.0)), size: image.size)
        }
    }
}

public final class VoiceChatController: ViewController {
    private final class Node: ViewControllerTracingNode {
        private struct ListTransition {
            let deletions: [ListViewDeleteItem]
            let insertions: [ListViewInsertItem]
            let updates: [ListViewUpdateItem]
            let isLoading: Bool
            let isEmpty: Bool
            let crossFade: Bool
        }
        
        private final class Interaction {
            
        }
        
        private struct PeerEntry: Comparable, Identifiable {
            var participant: RenderedChannelParticipant
            var activityTimestamp: Int32
            
            var stableId: PeerId {
                return self.participant.peer.id
            }
            
            static func <(lhs: PeerEntry, rhs: PeerEntry) -> Bool {
                if lhs.activityTimestamp != rhs.activityTimestamp {
                    return lhs.activityTimestamp > rhs.activityTimestamp
                }
                return lhs.participant.peer.id < rhs.participant.peer.id
            }
            
            func item(context: AccountContext, presentationData: ItemListPresentationData, interaction: Interaction) -> ListViewItem {
                let peer = self.participant.peer
                
                return ItemListPeerItem(presentationData: presentationData, dateTimeFormat: PresentationDateTimeFormat(timeFormat: .regular, dateFormat: .monthFirst, dateSeparator: ".", decimalSeparator: ".", groupingSeparator: "."), nameDisplayOrder: .firstLast, context: context, peer: peer, height: .peerList, presence: self.participant.presences[self.participant.peer.id], text: .presence, label: .none, editing: ItemListPeerItemEditing(editable: false, editing: false, revealed: false), revealOptions: ItemListPeerItemRevealOptions(options: [ItemListPeerItemRevealOption(type: .destructive, title: presentationData.strings.Common_Delete, action: {
                    //arguments.deleteIncludePeer(peer.peerId)
                })]), switchValue: nil, enabled: true, selectable: false, sectionId: 0, action: nil, setPeerIdWithRevealedOptions: { lhs, rhs in
                    //arguments.setItemIdWithRevealedOptions(lhs.flatMap { .peer($0) }, rhs.flatMap { .peer($0) })
                }, removePeer: { id in
                    //arguments.deleteIncludePeer(id)
                }, noInsets: true)
            }
        }
        
        private func preparedTransition(from fromEntries: [PeerEntry], to toEntries: [PeerEntry], isLoading: Bool, isEmpty: Bool, crossFade: Bool, context: AccountContext, presentationData: ItemListPresentationData, interaction: Interaction) -> ListTransition {
            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(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 ListTransition(deletions: deletions, insertions: insertions, updates: updates, isLoading: isLoading, isEmpty: isEmpty, crossFade: crossFade)
        }
        
        private weak var controller: VoiceChatController?
        private let context: AccountContext
        private let peerId: PeerId
        private var presentationData: PresentationData
        private var darkTheme: PresentationTheme
        
        private let contentContainer: ASDisplayNode
        private let listNode: ListView
        private let audioOutputNode: CallControllerButtonItemNode
        private let leaveNode: CallControllerButtonItemNode
        private let actionButton: VoiceChatActionButton
        private let radialStatus: RadialStatusNode
        private let statusLabel: ImmediateTextNode
        
        private var enqueuedTransitions: [ListTransition] = []
        
        private var validLayout: ContainerViewLayout?
        private var didSetContentsReady: Bool = false
        private var didSetDataReady: Bool = false
        
        private var currentEntries: [PeerEntry] = []
        private var peersDisposable: Disposable?
        
        private var peerViewDisposable: Disposable?
        
        private var itemInteraction: Interaction?
        
        init(controller: VoiceChatController, context: AccountContext, peerId: PeerId) {
            self.controller = controller
            self.context = context
            self.peerId = peerId
            
            self.presentationData = context.sharedContext.currentPresentationData.with { $0 }
            self.darkTheme = defaultDarkPresentationTheme
            
            self.contentContainer = ASDisplayNode()
            
            self.listNode = ListView()
            self.listNode.backgroundColor = self.darkTheme.list.itemBlocksBackgroundColor
            self.listNode.verticalScrollIndicatorColor = UIColor(white: 1.0, alpha: 0.3)
            self.listNode.clipsToBounds = true
            self.listNode.cornerRadius = 16.0
            
            self.audioOutputNode = CallControllerButtonItemNode()
            self.leaveNode = CallControllerButtonItemNode()
            self.actionButton = VoiceChatActionButton()
            self.statusLabel = ImmediateTextNode()
            self.statusLabel.attributedText = NSAttributedString(string: "Connecting...", font: Font.regular(17.0), textColor: .white)
            
            self.radialStatus = RadialStatusNode(backgroundNodeColor: .clear)
            
            super.init()
            
            self.itemInteraction = Interaction()
            
            self.backgroundColor = .black
            
            self.contentContainer.addSubnode(self.listNode)
            self.contentContainer.addSubnode(self.audioOutputNode)
            self.contentContainer.addSubnode(self.leaveNode)
            self.contentContainer.addSubnode(self.actionButton)
            self.contentContainer.addSubnode(self.statusLabel)
            self.contentContainer.addSubnode(self.radialStatus)
            
            self.addSubnode(self.contentContainer)
            
            let (disposable, loadMoreControl) = context.peerChannelMemberCategoriesContextsManager.recent(postbox: self.context.account.postbox, network: self.context.account.network, accountPeerId: self.context.account.peerId, peerId: self.peerId, updated: { [weak self] state in
                Queue.mainQueue().async {
                    self?.updateMembers(members: state.list)
                }
            })
            
            self.listNode.visibleBottomContentOffsetChanged = { [weak self] offset in
                guard let strongSelf = self else {
                    return
                }
                if case let .known(value) = offset, value < 40.0 {
                    strongSelf.context.peerChannelMemberCategoriesContextsManager.loadMore(peerId: strongSelf.peerId, control: loadMoreControl)
                }
            }
            
            self.peersDisposable = disposable
            
            self.peerViewDisposable = (self.context.account.viewTracker.peerView(self.peerId)
            |> deliverOnMainQueue).start(next: { [weak self] view in
                guard let strongSelf = self else {
                    return
                }
                
                guard let peer = view.peers[view.peerId] else {
                    return
                }
                var subtitle = "group"
                if let cachedData = view.cachedData as? CachedChannelData {
                    if let memberCount = cachedData.participantsSummary.memberCount {
                        subtitle = strongSelf.presentationData.strings.Conversation_StatusMembers(memberCount)
                    }
                }
                
                let titleView = VoiceChatControllerTitleView(theme: strongSelf.presentationData.theme)
                titleView.set(title: peer.debugDisplayTitle, subtitle: subtitle)
                strongSelf.controller?.navigationItem.titleView = titleView
                
                if !strongSelf.didSetDataReady {
                    strongSelf.didSetDataReady = true
                    strongSelf.controller?.dataReady.set(true)
                }
            })
            
            self.leaveNode.addTarget(self, action: #selector(self.leavePressed), forControlEvents: .touchUpInside)
        }
        
        deinit {
            self.peersDisposable?.dispose()
            self.peerViewDisposable?.dispose()
        }
        
        @objc private func leavePressed() {
            self.controller?.dismiss()
        }
        
        func containerLayoutUpdated(_ layout: ContainerViewLayout, navigationHeight: CGFloat, transition: ContainedViewLayoutTransition) {
            let isFirstTime = self.validLayout == nil
            self.validLayout = layout
            
            transition.updateFrame(node: self.contentContainer, frame: CGRect(origin: CGPoint(), size: layout.size))
            
            let bottomAreaHeight: CGFloat = 302.0
            
            let listOrigin = CGPoint(x: 16.0, y: navigationHeight + 10.0)
            let listFrame = CGRect(origin: listOrigin, size: CGSize(width: layout.size.width - 16.0 * 2.0, height: max(1.0, layout.size.height - bottomAreaHeight - listOrigin.y)))
            
            transition.updateFrame(node: self.listNode, frame: listFrame)
            
            let (duration, curve) = listViewAnimationDurationAndCurve(transition: transition)
            let updateSizeAndInsets = ListViewUpdateSizeAndInsets(size: listFrame.size, insets: UIEdgeInsets(top: -1.0, left: -6.0, bottom: -1.0, right: -6.0), scrollIndicatorInsets: UIEdgeInsets(top: 10.0, left: 0.0, bottom: 10.0, right: 0.0), duration: duration, curve: curve)
            
            self.listNode.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous, .LowLatency], scrollToItem: nil, updateSizeAndInsets: updateSizeAndInsets, stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
            
            let sideButtonSize = CGSize(width: 60.0, height: 60.0)
            let centralButtonSize = CGSize(width: 144.0, height: 144.0)
            let sideButtonInset: CGFloat = 27.0
            
            self.audioOutputNode.update(size: sideButtonSize, content: CallControllerButtonItemNode.Content(appearance: .color(.grayDimmed), image: .speaker), text: "audio", transition: .immediate)
            self.leaveNode.update(size: sideButtonSize, content: CallControllerButtonItemNode.Content(appearance: .color(.redDimmed), image: .end), text: "leave", transition: .immediate)
            
            transition.updateFrame(node: self.audioOutputNode, frame: CGRect(origin: CGPoint(x: sideButtonInset, y: layout.size.height - bottomAreaHeight + floor((bottomAreaHeight - sideButtonSize.height) / 2.0)), size: sideButtonSize))
            transition.updateFrame(node: self.leaveNode, frame: CGRect(origin: CGPoint(x: layout.size.width - sideButtonInset - sideButtonSize.width, y: layout.size.height - bottomAreaHeight + floor((bottomAreaHeight - sideButtonSize.height) / 2.0)), size: sideButtonSize))
            
            self.actionButton.updateLayout(size: centralButtonSize)
            let actionButtonFrame = CGRect(origin: CGPoint(x: floor((layout.size.width - centralButtonSize.width) / 2.0), y: layout.size.height - bottomAreaHeight + floor((bottomAreaHeight - centralButtonSize.height) / 2.0)), size: centralButtonSize)
            transition.updateFrame(node: self.actionButton, frame: actionButtonFrame)
            
            let statusSize = self.statusLabel.updateLayout(CGSize(width: layout.size.width, height: .greatestFiniteMagnitude))
            self.statusLabel.frame = CGRect(origin: CGPoint(x: floor((layout.size.width - statusSize.width) / 2.0), y: actionButtonFrame.maxY + 12.0), size: statusSize)
            
            self.radialStatus.transitionToState(.progress(color: UIColor(rgb: 0x00ACFF), lineWidth: 3.3, value: nil, cancelEnabled: false), animated: false)
            self.radialStatus.frame = actionButtonFrame.insetBy(dx: -3.3, dy: -3.3)
            
            if isFirstTime {
                while !self.enqueuedTransitions.isEmpty {
                    self.dequeueTransition()
                }
            }
        }
        
        func animateIn() {
            self.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.3)
            
            self.listNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.3)
            
            self.actionButton.layer.animateScale(from: 0.1, to: 1.0, duration: 0.5, timingFunction: kCAMediaTimingFunctionSpring)
            self.audioOutputNode.layer.animateScale(from: 0.1, to: 1.0, duration: 0.5, timingFunction: kCAMediaTimingFunctionSpring)
            self.leaveNode.layer.animateScale(from: 0.1, to: 1.0, duration: 0.5, timingFunction: kCAMediaTimingFunctionSpring)
            
            self.contentContainer.layer.animateBoundsOriginYAdditive(from: 80.0, to: 0.0, duration: 0.5, timingFunction: kCAMediaTimingFunctionSpring)
        }
        
        func animateOut(completion: (() -> Void)?) {
            self.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.3, removeOnCompletion: false, completion: { _ in
                completion?()
            })
        }
        
        private func enqueueTransition(_ transition: ListTransition) {
            self.enqueuedTransitions.append(transition)
            
            if let _ = self.validLayout {
                while !self.enqueuedTransitions.isEmpty {
                    self.dequeueTransition()
                }
            }
        }
        
        private func dequeueTransition() {
            guard let _ = self.validLayout, let transition = self.enqueuedTransitions.first else {
                return
            }
            self.enqueuedTransitions.remove(at: 0)
            
            var options = ListViewDeleteAndInsertOptions()
            if transition.crossFade {
                options.insert(.AnimateCrossfade)
            }
            
            self.listNode.transaction(deleteIndices: transition.deletions, insertIndicesAndItems: transition.insertions, updateIndicesAndItems: transition.updates, options: options, updateSizeAndInsets: nil, updateOpaqueState: nil, completion: { [weak self] _ in
                guard let strongSelf = self else {
                    return
                }
                if !strongSelf.didSetContentsReady {
                    strongSelf.didSetContentsReady = true
                    strongSelf.controller?.contentsReady.set(true)
                }
            })
        }
        
        private func updateMembers(members: [RenderedChannelParticipant]) {
            let previousEntries = self.currentEntries
            var entries: [PeerEntry] = []
            
            var index: Int32 = 0
            for member in members {
                entries.append(PeerEntry(
                    participant: member,
                    activityTimestamp: Int32.max - 1 - index
                ))
                index += 1
            }
            
            self.currentEntries = entries
            
            let presentationData = ItemListPresentationData(theme: self.darkTheme, fontSize: self.presentationData.listsFontSize, strings: self.presentationData.strings)
            
            let transition = preparedTransition(from: previousEntries, to: entries, isLoading: false, isEmpty: false, crossFade: false, context: context, presentationData: presentationData, interaction: self.itemInteraction!)
            self.enqueueTransition(transition)
        }
    }
    
    private let context: AccountContext
    private let peerId: PeerId
    private let presentationData: PresentationData
    
    fileprivate let contentsReady = ValuePromise<Bool>(false, ignoreRepeated: true)
    fileprivate let dataReady = ValuePromise<Bool>(false, ignoreRepeated: true)
    private let _ready = Promise<Bool>(false)
    override public var ready: Promise<Bool> {
        return self._ready
    }
    
    private var didAppearOnce: Bool = false
    private var isDismissed: Bool = false
    
    private var controllerNode: Node {
        return self.displayNode as! Node
    }
    
    public init(context: AccountContext, peerId: PeerId) {
        self.context = context
        self.peerId = peerId
        self.presentationData = context.sharedContext.currentPresentationData.with { $0 }
        
        let darkNavigationTheme = NavigationBarTheme(buttonColor: .white, disabledButtonColor: UIColor(rgb: 0x525252), primaryTextColor: .white, backgroundColor: UIColor(white: 0.0, alpha: 0.6), separatorColor: UIColor(white: 0.0, alpha: 0.8), badgeBackgroundColor: .clear, badgeStrokeColor: .clear, badgeTextColor: .clear)
        
        super.init(navigationBarPresentationData: NavigationBarPresentationData(theme: darkNavigationTheme, strings: NavigationBarStrings(presentationStrings: self.presentationData.strings)))
        
        self.supportedOrientations = ViewControllerSupportedOrientations(regularSize: .all, compactSize: .portrait)
        
        let backItem = UIBarButtonItem(backButtonAppearanceWithTitle: "Chat", target: self, action: #selector(self.closePressed))
        self.navigationItem.leftBarButtonItem = backItem
        
        self.statusBar.statusBarStyle = .White
        
        self._ready.set(combineLatest([
            self.contentsReady.get(),
            self.dataReady.get()
        ])
        |> map { values -> Bool in
            for value in values {
                if !value {
                    return false
                }
            }
            return true
        }
        |> filter { $0 })
    }
    
    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc private func closePressed() {
        self.dismiss()
    }
    
    override public func loadDisplayNode() {
        self.displayNode = Node(controller: self, context: self.context, peerId: self.peerId)
        
        self.displayNodeDidLoad()
    }
    
    override public func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        if !self.didAppearOnce {
            self.didAppearOnce = true
            
            self.controllerNode.animateIn()
        }
    }
    
    override public func dismiss(completion: (() -> Void)? = nil) {
        if !self.isDismissed {
            self.isDismissed = true
            
            self.controllerNode.animateOut(completion: { [weak self] in
                completion?()
                self?.presentingViewController?.dismiss(animated: false)
            })
        }
    }
    
    override public func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        self.controllerNode.containerLayoutUpdated(layout, navigationHeight: self.navigationHeight, transition: transition)
    }
}