////
////  Copyright (c) 2019 Open Whisper Systems. All rights reserved.
////
//
//import Foundation
//import SignalUtilitiesKit
//
//public enum CallState: String {
//    case idle
//    case dialing
//    case answering
//    case remoteRinging
//    case localRinging
//    case connected
//    case reconnecting
//    case localFailure // terminal
//    case localHangup // terminal
//    case remoteHangup // terminal
//    case remoteBusy // terminal
//}
//
//enum CallDirection {
//    case outgoing, incoming
//}
//
//// All Observer methods will be invoked from the main thread.
//protocol CallObserver: class {
//    func stateDidChange(call: SignalCall, state: CallState)
//    func hasLocalVideoDidChange(call: SignalCall, hasLocalVideo: Bool)
//    func muteDidChange(call: SignalCall, isMuted: Bool)
//    func holdDidChange(call: SignalCall, isOnHold: Bool)
//    func audioSourceDidChange(call: SignalCall, audioSource: AudioSource?)
//}
//
///**
// * Data model for a WebRTC backed voice/video call.
// *
// * This class' state should only be accessed on the main queue.
// */
//@objc public class SignalCall: NSObject {
//
//    var observers = [Weak<CallObserver>]()
//
//    @objc
//    let remotePhoneNumber: String
//
//    var isTerminated: Bool {
//        switch state {
//        case .localFailure, .localHangup, .remoteHangup, .remoteBusy:
//            return true
//        case .idle, .dialing, .answering, .remoteRinging, .localRinging, .connected, .reconnecting:
//            return false
//        }
//    }
//
//    // Signal Service identifier for this Call. Used to coordinate the call across remote clients.
//    let signalingId: UInt64
//
//    let direction: CallDirection
//
//    // Distinguishes between calls locally, e.g. in CallKit
//    @objc
//    let localId: UUID
//
//    let thread: TSContactThread
//
//    var callRecord: TSCall? {
//        didSet {
//            AssertIsOnMainThread()
//            assert(oldValue == nil)
//
//            updateCallRecordType()
//        }
//    }
//
//    var hasLocalVideo = false {
//        didSet {
//            AssertIsOnMainThread()
//
//            for observer in observers {
//                observer.value?.hasLocalVideoDidChange(call: self, hasLocalVideo: hasLocalVideo)
//            }
//        }
//    }
//
//    var state: CallState {
//        didSet {
//            AssertIsOnMainThread()
//            Logger.debug("state changed: \(oldValue) -> \(self.state) for call: \(self.identifiersForLogs)")
//
//            // Update connectedDate
//            if case .connected = self.state {
//                // if it's the first time we've connected (not a reconnect)
//                if connectedDate == nil {
//                    connectedDate = NSDate()
//                }
//            }
//
//            updateCallRecordType()
//
//            for observer in observers {
//                observer.value?.stateDidChange(call: self, state: state)
//            }
//        }
//    }
//
//    var isMuted = false {
//        didSet {
//            AssertIsOnMainThread()
//
//            Logger.debug("muted changed: \(oldValue) -> \(self.isMuted)")
//
//            for observer in observers {
//                observer.value?.muteDidChange(call: self, isMuted: isMuted)
//            }
//        }
//    }
//
//    let audioActivity: AudioActivity
//
//    var audioSource: AudioSource? = nil {
//        didSet {
//            AssertIsOnMainThread()
//            Logger.debug("audioSource changed: \(String(describing: oldValue)) -> \(String(describing: audioSource))")
//
//            for observer in observers {
//                observer.value?.audioSourceDidChange(call: self, audioSource: audioSource)
//            }
//        }
//    }
//
//    var isSpeakerphoneEnabled: Bool {
//        guard let audioSource = self.audioSource else {
//            return false
//        }
//
//        return audioSource.isBuiltInSpeaker
//    }
//
//    var isOnHold = false {
//        didSet {
//            AssertIsOnMainThread()
//            Logger.debug("isOnHold changed: \(oldValue) -> \(self.isOnHold)")
//
//            for observer in observers {
//                observer.value?.holdDidChange(call: self, isOnHold: isOnHold)
//            }
//        }
//    }
//
//    var connectedDate: NSDate?
//
//    var error: CallError?
//
//    // MARK: Initializers and Factory Methods
//
//    init(direction: CallDirection, localId: UUID, signalingId: UInt64, state: CallState, remotePhoneNumber: String) {
//        self.direction = direction
//        self.localId = localId
//        self.signalingId = signalingId
//        self.state = state
//        self.remotePhoneNumber = remotePhoneNumber
//        self.thread = TSContactThread.getOrCreateThread(contactId: remotePhoneNumber)
//        self.audioActivity = AudioActivity(audioDescription: "[SignalCall] with \(remotePhoneNumber)", behavior: .call)
//    }
//
//    // A string containing the three identifiers for this call.
//    var identifiersForLogs: String {
//        return "{\(remotePhoneNumber), \(localId), \(signalingId)}"
//    }
//
//    class func outgoingCall(localId: UUID, remotePhoneNumber: String) -> SignalCall {
//        return SignalCall(direction: .outgoing, localId: localId, signalingId: newCallSignalingId(), state: .dialing, remotePhoneNumber: remotePhoneNumber)
//    }
//
//    class func incomingCall(localId: UUID, remotePhoneNumber: String, signalingId: UInt64) -> SignalCall {
//        return SignalCall(direction: .incoming, localId: localId, signalingId: signalingId, state: .answering, remotePhoneNumber: remotePhoneNumber)
//    }
//
//    // -
//
//    func addObserverAndSyncState(observer: CallObserver) {
//        AssertIsOnMainThread()
//
//        observers.append(Weak(value: observer))
//
//        // Synchronize observer with current call state
//        observer.stateDidChange(call: self, state: state)
//    }
//
//    func removeObserver(_ observer: CallObserver) {
//        AssertIsOnMainThread()
//
//        while let index = observers.firstIndex(where: { $0.value === observer }) {
//            observers.remove(at: index)
//        }
//    }
//
//    func removeAllObservers() {
//        AssertIsOnMainThread()
//
//        observers = []
//    }
//
//    private func updateCallRecordType() {
//        AssertIsOnMainThread()
//
//        guard let callRecord = self.callRecord else {
//            return
//        }
//
//        // Mark incomplete calls as completed if call has connected.
//        if state == .connected &&
//            callRecord.callType == RPRecentCallTypeOutgoingIncomplete {
//            callRecord.updateCallType(RPRecentCallTypeOutgoing)
//        }
//        if state == .connected &&
//            callRecord.callType == RPRecentCallTypeIncomingIncomplete {
//            callRecord.updateCallType(RPRecentCallTypeIncoming)
//        }
//    }
//
//    // MARK: Equatable
//
//    static func == (lhs: SignalCall, rhs: SignalCall) -> Bool {
//        return lhs.localId == rhs.localId
//    }
//
//    static func newCallSignalingId() -> UInt64 {
//        return UInt64.ows_random()
//    }
//
//    // This method should only be called when the call state is "connected".
//    func connectionDuration() -> TimeInterval {
//        return -connectedDate!.timeIntervalSinceNow
//    }
//}
//
//fileprivate extension UInt64 {
//    static func ows_random() -> UInt64 {
//        return Cryptography.randomUInt64()
//    }
//}