////
////  Copyright (c) 2019 Open Whisper Systems. All rights reserved.
////
//
//import Foundation
//import AVFoundation
//import SessionServiceKit
//import SignalMessaging
//
//struct AudioSource: Hashable {
//
//    let image: UIImage
//    let localizedName: String
//    let portDescription: AVAudioSessionPortDescription?
//
//    // The built-in loud speaker / aka speakerphone
//    let isBuiltInSpeaker: Bool
//
//    // The built-in quiet speaker, aka the normal phone handset receiver earpiece
//    let isBuiltInEarPiece: Bool
//
//    init(localizedName: String, image: UIImage, isBuiltInSpeaker: Bool, isBuiltInEarPiece: Bool, portDescription: AVAudioSessionPortDescription? = nil) {
//        self.localizedName = localizedName
//        self.image = image
//        self.isBuiltInSpeaker = isBuiltInSpeaker
//        self.isBuiltInEarPiece = isBuiltInEarPiece
//        self.portDescription = portDescription
//    }
//
//    init(portDescription: AVAudioSessionPortDescription) {
//
//        let isBuiltInEarPiece = portDescription.portType == AVAudioSession.Port.builtInMic
//
//        // portDescription.portName works well for BT linked devices, but if we are using
//        // the built in mic, we have "iPhone Microphone" which is a little awkward.
//        // In that case, instead we prefer just the model name e.g. "iPhone" or "iPad"
//        let localizedName = isBuiltInEarPiece ? UIDevice.current.localizedModel : portDescription.portName
//
//        self.init(localizedName: localizedName,
//                  image: #imageLiteral(resourceName: "button_phone_white"), // TODO
//                  isBuiltInSpeaker: false,
//                  isBuiltInEarPiece: isBuiltInEarPiece,
//                  portDescription: portDescription)
//    }
//
//    // Speakerphone is handled separately from the other audio routes as it doesn't appear as an "input"
//    static var builtInSpeaker: AudioSource {
//        return self.init(localizedName: NSLocalizedString("AUDIO_ROUTE_BUILT_IN_SPEAKER", comment: "action sheet button title to enable built in speaker during a call"),
//                         image: #imageLiteral(resourceName: "button_phone_white"), //TODO
//                         isBuiltInSpeaker: true,
//                         isBuiltInEarPiece: false)
//    }
//
//    // MARK: Hashable
//
//    static func ==(lhs: AudioSource, rhs: AudioSource) -> Bool {
//        // Simply comparing the `portDescription` vs the `portDescription.uid`
//        // caused multiple instances of the built in mic to turn up in a set.
//        if lhs.isBuiltInSpeaker && rhs.isBuiltInSpeaker {
//            return true
//        }
//
//        if lhs.isBuiltInSpeaker || rhs.isBuiltInSpeaker {
//            return false
//        }
//
//        guard let lhsPortDescription = lhs.portDescription else {
//            owsFailDebug("only the built in speaker should lack a port description")
//            return false
//        }
//
//        guard let rhsPortDescription = rhs.portDescription else {
//            owsFailDebug("only the built in speaker should lack a port description")
//            return false
//        }
//
//        return lhsPortDescription.uid == rhsPortDescription.uid
//    }
//
//    var hashValue: Int {
//        guard let portDescription = self.portDescription else {
//            assert(self.isBuiltInSpeaker)
//            return "Built In Speaker".hashValue
//        }
//        return portDescription.uid.hash
//    }
//}
//
//protocol CallAudioServiceDelegate: class {
//    func callAudioService(_ callAudioService: CallAudioService, didUpdateIsSpeakerphoneEnabled isEnabled: Bool)
//    func callAudioServiceDidChangeAudioSession(_ callAudioService: CallAudioService)
//}
//
//@objc class CallAudioService: NSObject, CallObserver {
//
//    private var vibrateTimer: Timer?
//    private let audioPlayer = AVAudioPlayer()
//    private let handleRinging: Bool
//    weak var delegate: CallAudioServiceDelegate? {
//        willSet {
//            assert(newValue == nil || delegate == nil)
//        }
//    }
//
//    // MARK: Vibration config
//    private let vibrateRepeatDuration = 1.6
//
//    // Our ring buzz is a pair of vibrations.
//    // `pulseDuration` is the small pause between the two vibrations in the pair.
//    private let pulseDuration = 0.2
//
//    var audioSession: OWSAudioSession {
//        return Environment.shared.audioSession
//    }
//
//    var avAudioSession: AVAudioSession {
//        return AVAudioSession.sharedInstance()
//    }
//
//    // MARK: - Initializers
//
//    init(handleRinging: Bool) {
//        self.handleRinging = handleRinging
//
//        super.init()
//
//        // We cannot assert singleton here, because this class gets rebuilt when the user changes relevant call settings
//
//        // Configure audio session so we don't prompt user with Record permission until call is connected.
//
//        audioSession.configureRTCAudio()
//        NotificationCenter.default.addObserver(forName: AVAudioSession.routeChangeNotification, object: avAudioSession, queue: nil) { _ in
//            assert(!Thread.isMainThread)
//            self.updateIsSpeakerphoneEnabled()
//        }
//    }
//
//    deinit {
//        NotificationCenter.default.removeObserver(self)
//    }
//
//    // MARK: - CallObserver
//
//    internal func stateDidChange(call: SignalCall, state: CallState) {
//        AssertIsOnMainThread()
//        self.handleState(call: call)
//    }
//
//    internal func muteDidChange(call: SignalCall, isMuted: Bool) {
//        AssertIsOnMainThread()
//
//        ensureProperAudioSession(call: call)
//    }
//
//    internal func holdDidChange(call: SignalCall, isOnHold: Bool) {
//        AssertIsOnMainThread()
//
//        ensureProperAudioSession(call: call)
//    }
//
//    internal func audioSourceDidChange(call: SignalCall, audioSource: AudioSource?) {
//        AssertIsOnMainThread()
//
//        ensureProperAudioSession(call: call)
//
//        if let audioSource = audioSource, audioSource.isBuiltInSpeaker {
//            self.isSpeakerphoneEnabled = true
//        } else {
//            self.isSpeakerphoneEnabled = false
//        }
//    }
//
//    internal func hasLocalVideoDidChange(call: SignalCall, hasLocalVideo: Bool) {
//        AssertIsOnMainThread()
//
//        ensureProperAudioSession(call: call)
//    }
//
//    // Speakerphone can be manipulated by the in-app callscreen or via the system callscreen (CallKit).
//    // Unlike other CallKit CallScreen buttons, enabling doesn't trigger a CXAction, so it's not as simple
//    // to track state changes. Instead we never store the state and directly access the ground-truth in the
//    // AVAudioSession.
//    private(set) var isSpeakerphoneEnabled: Bool = false {
//        didSet {
//            self.delegate?.callAudioService(self, didUpdateIsSpeakerphoneEnabled: isSpeakerphoneEnabled)
//        }
//    }
//
//    public func requestSpeakerphone(isEnabled: Bool) {
//        // This is a little too slow to execute on the main thread and the results are not immediately available after execution
//        // anyway, so we dispatch async. If you need to know the new value, you'll need to check isSpeakerphoneEnabled and take
//        // advantage of the CallAudioServiceDelegate.callAudioService(_:didUpdateIsSpeakerphoneEnabled:)
//        DispatchQueue.global().async {
//            do {
//                try self.avAudioSession.overrideOutputAudioPort( isEnabled ? .speaker : .none )
//            } catch {
//                owsFailDebug("failed to set \(#function) = \(isEnabled) with error: \(error)")
//            }
//        }
//    }
//
//    private func updateIsSpeakerphoneEnabled() {
//        let value = avAudioSession.currentRoute.outputs.contains { (portDescription: AVAudioSessionPortDescription) -> Bool in
//            return portDescription.portType == .builtInSpeaker
//        }
//        DispatchQueue.main.async {
//            self.isSpeakerphoneEnabled = value
//        }
//    }
//
//    private func ensureProperAudioSession(call: SignalCall?) {
//        AssertIsOnMainThread()
//
//        guard let call = call, !call.isTerminated else {
//            // Revert to default audio
//            setAudioSession(category: .soloAmbient,
//                            mode: .default)
//            return
//        }
//
//        // Disallow bluetooth while (and only while) the user has explicitly chosen the built in receiver.
//        //
//        // NOTE: I'm actually not sure why this is required - it seems like we should just be able
//        // to setPreferredInput to call.audioSource.portDescription in this case,
//        // but in practice I'm seeing the call revert to the bluetooth headset.
//        // Presumably something else (in WebRTC?) is touching our shared AudioSession. - mjk
//        let options: AVAudioSession.CategoryOptions = call.audioSource?.isBuiltInEarPiece == true ? [] : [.allowBluetooth]
//
//        if call.state == .localRinging {
//            // SoloAmbient plays through speaker, but respects silent switch
//            setAudioSession(category: .soloAmbient,
//                            mode: .default)
//        } else if call.hasLocalVideo {
//            // Because ModeVideoChat affects gain, we don't want to apply it until the call is connected.
//            // otherwise sounds like ringing will be extra loud for video vs. speakerphone
//
//            // Apple Docs say that setting mode to AVAudioSessionModeVideoChat has the
//            // side effect of setting options: .allowBluetooth, when I remove the (seemingly unnecessary)
//            // option, and inspect AVAudioSession.sharedInstance.categoryOptions == 0. And availableInputs
//            // does not include my linked bluetooth device
//            setAudioSession(category: .playAndRecord,
//                            mode: .videoChat,
//                            options: options)
//        } else {
//            // Apple Docs say that setting mode to AVAudioSessionModeVoiceChat has the
//            // side effect of setting options: .allowBluetooth, when I remove the (seemingly unnecessary)
//            // option, and inspect AVAudioSession.sharedInstance.categoryOptions == 0. And availableInputs
//            // does not include my linked bluetooth device
//            setAudioSession(category: .playAndRecord,
//                            mode: .voiceChat,
//                            options: options)
//        }
//
//        do {
//            // It's important to set preferred input *after* ensuring properAudioSession
//            // because some sources are only valid for certain category/option combinations.
//            let existingPreferredInput = avAudioSession.preferredInput
//            if  existingPreferredInput != call.audioSource?.portDescription {
//                Logger.info("changing preferred input: \(String(describing: existingPreferredInput)) -> \(String(describing: call.audioSource?.portDescription))")
//                try avAudioSession.setPreferredInput(call.audioSource?.portDescription)
//            }
//
//        } catch {
//            owsFailDebug("failed setting audio source with error: \(error) isSpeakerPhoneEnabled: \(call.isSpeakerphoneEnabled)")
//        }
//    }
//
//    // MARK: - Service action handlers
//
//    public func didUpdateVideoTracks(call: SignalCall?) {
//        Logger.verbose("")
//
//        self.ensureProperAudioSession(call: call)
//    }
//
//    public func handleState(call: SignalCall) {
//        assert(Thread.isMainThread)
//
//        Logger.verbose("new state: \(call.state)")
//
//        // Stop playing sounds while switching audio session so we don't 
//        // get any blips across a temporary unintended route.
//        stopPlayingAnySounds()
//        self.ensureProperAudioSession(call: call)
//
//        switch call.state {
//        case .idle: handleIdle(call: call)
//        case .dialing: handleDialing(call: call)
//        case .answering: handleAnswering(call: call)
//        case .remoteRinging: handleRemoteRinging(call: call)
//        case .localRinging: handleLocalRinging(call: call)
//        case .connected: handleConnected(call: call)
//        case .reconnecting: handleReconnecting(call: call)
//        case .localFailure: handleLocalFailure(call: call)
//        case .localHangup: handleLocalHangup(call: call)
//        case .remoteHangup: handleRemoteHangup(call: call)
//        case .remoteBusy: handleBusy(call: call)
//        }
//    }
//
//    private func handleIdle(call: SignalCall) {
//        Logger.debug("")
//    }
//
//    private func handleDialing(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        // HACK: Without this async, dialing sound only plays once. I don't really understand why. Does the audioSession
//        // need some time to settle? Is somethign else interrupting our session?
//        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.2) {
//            self.play(sound: OWSSound.callConnecting)
//        }
//    }
//
//    private func handleAnswering(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//    }
//
//    private func handleRemoteRinging(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        self.play(sound: OWSSound.callOutboundRinging)
//    }
//
//    private func handleLocalRinging(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        startRinging(call: call)
//    }
//
//    private func handleConnected(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//    }
//
//    private func handleReconnecting(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//    }
//
//    private func handleLocalFailure(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        play(sound: OWSSound.callFailure)
//        handleCallEnded(call: call)
//    }
//
//    private func handleLocalHangup(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        handleCallEnded(call: call)
//    }
//
//    private func handleRemoteHangup(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        vibrate()
//
//        handleCallEnded(call: call)
//    }
//
//    private func handleBusy(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        play(sound: OWSSound.callBusy)
//
//        // Let the busy sound play for 4 seconds. The full file is longer than necessary
//        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 4.0) {
//            self.handleCallEnded(call: call)
//        }
//    }
//
//    private func handleCallEnded(call: SignalCall) {
//        AssertIsOnMainThread()
//        Logger.debug("")
//
//        // Stop solo audio, revert to default.
//        isSpeakerphoneEnabled = false
//        setAudioSession(category: .soloAmbient)
//    }
//
//    // MARK: Playing Sounds
//
//    var currentPlayer: OWSAudioPlayer?
//
//    private func stopPlayingAnySounds() {
//        currentPlayer?.stop()
//        stopAnyRingingVibration()
//    }
//
//    private func play(sound: OWSSound) {
//        guard let newPlayer = OWSSounds.audioPlayer(for: sound, audioBehavior: .call) else {
//            owsFailDebug("unable to build player for sound: \(OWSSounds.displayName(for: sound))")
//            return
//        }
//        Logger.info("playing sound: \(OWSSounds.displayName(for: sound))")
//
//        // It's important to stop the current player **before** starting the new player. In the case that 
//        // we're playing the same sound, since the player is memoized on the sound instance, we'd otherwise 
//        // stop the sound we just started.
//        self.currentPlayer?.stop()
//        newPlayer.play()
//        self.currentPlayer = newPlayer
//    }
//
//    // MARK: - Ringing
//
//    private func startRinging(call: SignalCall) {
//        guard handleRinging else {
//            Logger.debug("ignoring \(#function) since CallKit handles it's own ringing state")
//            return
//        }
//
//        vibrateTimer = WeakTimer.scheduledTimer(timeInterval: vibrateRepeatDuration, target: self, userInfo: nil, repeats: true) {[weak self] _ in
//            self?.ringVibration()
//        }
//        vibrateTimer?.fire()
//        play(sound: .defaultiOSIncomingRingtone)
//    }
//
//    private func stopAnyRingingVibration() {
//        guard handleRinging else {
//            Logger.debug("ignoring \(#function) since CallKit handles it's own ringing state")
//            return
//        }
//        Logger.debug("")
//
//        // Stop vibrating
//        vibrateTimer?.invalidate()
//        vibrateTimer = nil
//    }
//
//    // public so it can be called by timer via selector
//    public func ringVibration() {
//        // Since a call notification is more urgent than a message notifaction, we
//        // vibrate twice, like a pulse, to differentiate from a normal notification vibration.
//        vibrate()
//        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + pulseDuration) {
//            self.vibrate()
//        }
//    }
//
//    func vibrate() {
//        // TODO implement HapticAdapter for iPhone7 and up
//        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate)
//    }
//
//    // MARK: - AudioSession MGMT
//    // TODO move this to CallAudioSession?
//
//    // Note this method is sensitive to the current audio session configuration.
//    // Specifically if you call it while speakerphone is enabled you won't see 
//    // any connected bluetooth routes.
//    var availableInputs: [AudioSource] {
//        guard let availableInputs = avAudioSession.availableInputs else {
//            // I'm not sure why this would happen, but it may indicate an error.
//            owsFailDebug("No available inputs or inputs not ready")
//            return [AudioSource.builtInSpeaker]
//        }
//
//        Logger.info("availableInputs: \(availableInputs)")
//        return [AudioSource.builtInSpeaker] + availableInputs.map { portDescription in
//            return AudioSource(portDescription: portDescription)
//        }
//    }
//
//    func currentAudioSource(call: SignalCall) -> AudioSource? {
//        if let audioSource = call.audioSource {
//            return audioSource
//        }
//
//        // Before the user has specified an audio source on the call, we rely on the existing
//        // system state to determine the current audio source.
//        // If a bluetooth is connected, this will be bluetooth, otherwise
//        // this will be the receiver.
//        guard let portDescription = avAudioSession.currentRoute.inputs.first else {
//            return nil
//        }
//
//        return AudioSource(portDescription: portDescription)
//    }
//
//    private func setAudioSession(category: AVAudioSession.Category,
//                                 mode: AVAudioSession.Mode? = nil,
//                                 options: AVAudioSession.CategoryOptions = AVAudioSession.CategoryOptions(rawValue: 0)) {
//
//        AssertIsOnMainThread()
//
//        var audioSessionChanged = false
//        do {
//            if #available(iOS 10.0, *), let mode = mode {
//                let oldCategory = avAudioSession.category
//                let oldMode = avAudioSession.mode
//                let oldOptions = avAudioSession.categoryOptions
//
//                guard oldCategory != category || oldMode != mode || oldOptions != options else {
//                    return
//                }
//
//                audioSessionChanged = true
//
//                if oldCategory != category {
//                    Logger.debug("audio session changed category: \(oldCategory) -> \(category) ")
//                }
//                if oldMode != mode {
//                    Logger.debug("audio session changed mode: \(oldMode) -> \(mode) ")
//                }
//                if oldOptions != options {
//                    Logger.debug("audio session changed options: \(oldOptions) -> \(options) ")
//                }
//                try avAudioSession.setCategory(category, mode: mode, options: options)
//
//            } else {
//                let oldCategory = avAudioSession.category
//                let oldOptions = avAudioSession.categoryOptions
//
//                guard avAudioSession.category != category || avAudioSession.categoryOptions != options else {
//                    return
//                }
//
//                audioSessionChanged = true
//
//                if oldCategory != category {
//                    Logger.debug("audio session changed category: \(oldCategory) -> \(category) ")
//                }
//                if oldOptions != options {
//                    Logger.debug("audio session changed options: \(oldOptions) -> \(options) ")
//                }
//                try avAudioSession.ows_setCategory(category, with: options)
//            }
//        } catch {
//            let message = "failed to set category: \(category) mode: \(String(describing: mode)), options: \(options) with error: \(error)"
//            owsFailDebug(message)
//        }
//
//        if audioSessionChanged {
//            Logger.info("")
//            self.delegate?.callAudioServiceDidChangeAudioSession(self)
//        }
//    }
//}