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

public final class CallController: ViewController {
    private var controllerNode: CallControllerNode {
        return self.displayNode as! CallControllerNode
    }
    
    private let _ready = Promise<Bool>(false)
    override public var ready: Promise<Bool> {
        return self._ready
    }
    
    private let account: Account
    public let call: PresentationCall
    
    private var presentationData: PresentationData
    private var animatedAppearance = false
    
    private var peer: Peer?
    
    private var peerDisposable: Disposable?
    private var disposable: Disposable?
    
    private var callMutedDisposable: Disposable?
    private var isMuted = false
    
    private var audioOutputStateDisposable: Disposable?
    private var audioOutputState: ([AudioSessionOutput], AudioSessionOutput?)?
    
    public init(account: Account, call: PresentationCall) {
        self.account = account
        self.call = call
        
        self.presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
        
        super.init(navigationBarPresentationData: nil)
        
        self.statusBar.statusBarStyle = .White
        self.statusBar.ignoreInCall = true
        
        self.supportedOrientations = ViewControllerSupportedOrientations(regularSize: .portrait, compactSize: .portrait)
        
        self.disposable = (call.state
        |> deliverOnMainQueue).start(next: { [weak self] callState in
            self?.callStateUpdated(callState)
        })
        
        self.callMutedDisposable = (call.isMuted
        |> deliverOnMainQueue).start(next: { [weak self] value in
            if let strongSelf = self {
                strongSelf.isMuted = value
                if strongSelf.isNodeLoaded {
                    strongSelf.controllerNode.isMuted = value
                }
            }
        })
        
        self.audioOutputStateDisposable = (call.audioOutputState
        |> deliverOnMainQueue).start(next: { [weak self] state in
            if let strongSelf = self {
                strongSelf.audioOutputState = state
                if strongSelf.isNodeLoaded {
                    strongSelf.controllerNode.updateAudioOutputs(availableOutputs: state.0, currentOutput: state.1)
                }
            }
        })
    }
    
    required public init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        self.peerDisposable?.dispose()
        self.disposable?.dispose()
        self.callMutedDisposable?.dispose()
        self.audioOutputStateDisposable?.dispose()
    }
    
    private func callStateUpdated(_ callState: PresentationCallState) {
        if self.isNodeLoaded {
            self.controllerNode.updateCallState(callState)
        }
    }
    
    override public func loadDisplayNode() {
        self.displayNode = CallControllerNode(account: self.account, presentationData: self.presentationData, statusBar: self.statusBar, debugInfo: self.call.debugInfo(), shouldStayHiddenUntilConnection: !self.call.isOutgoing && self.call.isIntegratedWithCallKit)
        self.displayNodeDidLoad()
        
        self.controllerNode.toggleMute = { [weak self] in
            self?.call.toggleIsMuted()
        }
        
        self.controllerNode.setCurrentAudioOutput = { [weak self] output in
            self?.call.setCurrentAudioOutput(output)
        }
        
        self.controllerNode.beginAudioOuputSelection = { [weak self] in
            guard let strongSelf = self, let (availableOutputs, currentOutput) = strongSelf.audioOutputState else {
                return
            }
            guard availableOutputs.count >= 2 else {
                return
            }
            if availableOutputs.count == 2 {
                for output in availableOutputs {
                    if output != currentOutput {
                        strongSelf.call.setCurrentAudioOutput(output)
                        break
                    }
                }
            } else {
                let actionSheet = ActionSheetController(presentationTheme: strongSelf.presentationData.theme)
                var items: [ActionSheetItem] = []
                for output in availableOutputs {
                    let title: String
                    var icon: UIImage?
                    switch output {
                        case .builtin:
                            title = UIDevice.current.model
                        case .speaker:
                            title = strongSelf.presentationData.strings.Call_AudioRouteSpeaker
                            icon = UIImage(bundleImageName: "Call/CallRouteSpeaker")
                        case .headphones:
                            title = strongSelf.presentationData.strings.Call_AudioRouteHeadphones
                        case let .port(port):
                            title = port.name
                            if port.type == .bluetooth {
                                icon = UIImage(bundleImageName: "Call/CallRouteBluetooth")
                            }
                    }
                    items.append(CallRouteActionSheetItem(title: title, icon: icon, selected: output == currentOutput, action: { [weak actionSheet] in
                        actionSheet?.dismissAnimated()
                        self?.call.setCurrentAudioOutput(output)
                    }))
                }
                
                actionSheet.setItemGroups([ActionSheetItemGroup(items: items), ActionSheetItemGroup(items: [
                        ActionSheetButtonItem(title: strongSelf.presentationData.strings.Common_Cancel, color: .accent, action: { [weak actionSheet] in
                            actionSheet?.dismissAnimated()
                        })
                    ])
                ])
                strongSelf.present(actionSheet, in: .window(.root))
            }
        }
        
        self.controllerNode.acceptCall = { [weak self] in
            let _ = self?.call.answer()
        }
        
        self.controllerNode.endCall = { [weak self] in
            let _ = self?.call.hangUp()
        }
        
        self.controllerNode.back = { [weak self] in
            let _ = self?.dismiss()
        }
        
        self.controllerNode.dismissedInteractively = { [weak self] in
            self?.animatedAppearance = false
            self?.presentingViewController?.dismiss(animated: false, completion: nil)
        }
        
        self.peerDisposable = (account.postbox.peerView(id: self.call.peerId)
        |> deliverOnMainQueue).start(next: { [weak self] view in
            if let strongSelf = self {
                if let peer = view.peers[view.peerId] {
                    strongSelf.peer = peer
                    strongSelf.controllerNode.updatePeer(peer: peer)
                    strongSelf._ready.set(.single(true))
                }
            }
        })
        
        self.controllerNode.isMuted = self.isMuted
       
        if let audioOutputState = self.audioOutputState {
            self.controllerNode.updateAudioOutputs(availableOutputs: audioOutputState.0, currentOutput: audioOutputState.1)
        }
    }
    
    override public func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        if !self.animatedAppearance {
            self.animatedAppearance = true
            
            self.controllerNode.animateIn()
        }
    }
    
    override public func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        self.controllerNode.containerLayoutUpdated(layout, navigationBarHeight: self.navigationHeight, transition: transition)
    }
    
    override public func dismiss(completion: (() -> Void)? = nil) {
        self.controllerNode.animateOut(completion: { [weak self] in
            self?.animatedAppearance = false
            self?.presentingViewController?.dismiss(animated: false, completion: nil)
            
            completion?()
        })
    }
    
    @objc func backPressed() {
        self.dismiss()
    }
}