<commit_before>//
//  CocoaMQTT.swift
//  CocoaMQTT
//
//  Created by <NAME><<EMAIL>> on 14/7/28.
//  Copyright (c) 2014年 slimpp.io. All rights reserved.
//

import Foundation

/**
 * MQTT Delegate
 */
protocol CocoaMQTTDelegate {

    /**
     * MQTT connected with server
     */
    func mqtt(mqtt: CocoaMQTT, didConnect host: String, port: Int)

    func mqtt(mqtt: CocoaMQTT, didConnectAck ack: CocoaMQTTConnAck)

    func mqtt(mqtt: CocoaMQTT, didPublishMessage message: CocoaMQTTMessage, id: UInt16)

    func mqtt(mqtt: CocoaMQTT, didReceiveMessage message: CocoaMQTTMessage, id: UInt16 )

    func mqtt(mqtt: CocoaMQTT, didSubscribeTopic topic: String)

    func mqtt(mqtt: CocoaMQTT, didUnsubscribeTopic topic: String)

    func mqttDidPing(mqtt: CocoaMQTT)

    func mqttDidReceivePong(mqtt: CocoaMQTT)

    func mqttDidDisconnect(mqtt: CocoaMQTT, withError err: NSError)

}

/**
 * Blueprint of the MQTT client
 */
protocol CocoaMQTTClient {

    var host: String { get set }

    var port: UInt16 { get set }

    var clientId: String { get }

    var username: String? {get set}

    var password: String? {get set}

    var cleansess: Bool {get set}

    var keepAlive: UInt16 {get set}

    var willMessage: CocoaMQTTWill? {get set}

    func connect() -> Bool

    func publish(topic: String, withString string: String, qos: CocoaMQTTQOS) -> UInt16

    func publish(message: CocoaMQTTMessage) -> UInt16

    func subscribe(topic: String, qos: CocoaMQTTQOS) -> UInt16

    func unsubscribe(topic: String) -> UInt16

    func ping()

    func disconnect()

}


/**
 * QOS
 */
enum CocoaMQTTQOS: UInt8 {

    case QOS0 = 0

    case QOS1

    case QOS2
}

/**
 * Connection State
 */
enum CocoaMQTTConnState: UInt8 {

    case INIT = 0

    case CONNECTING

    case CONNECTED

    case DISCONNECTED
}


/**
 * Conn Ack
 */
enum CocoaMQTTConnAck: UInt8 {

    case ACCEPT  = 0

    case PROTO_VER

    case INVALID_ID

    case SERVER

    case CREDENTIALS

    case AUTH

}

/**
 * asyncsocket read tag
 */
enum CocoaMQTTReadTag: Int {

    case TAG_HEADER = 0

    case TAG_LENGTH

    case TAG_PAYLOAD

}

/**
 * Main CocoaMQTT Class
 *
 * Notice: GCDAsyncSocket need delegate to extend NSObject
 */
class CocoaMQTT: NSObject, CocoaMQTTClient, GCDAsyncSocketDelegate, CocoaMQTTReaderDelegate {

    //client variables

    var host = "localhost"

    var port: UInt16 = 1883

    var clientId: String

    var username: String?

    var password: <PASSWORD>?

    var cleansess: Bool = true

    //keep alive

    var keepAlive: UInt16 = 0

    var aliveTimer: MSWeakTimer?

    //will message

    var willMessage: CocoaMQTTWill?

    //delegate

    var delegate: CocoaMQTTDelegate?

    //socket and connection

    var connState = CocoaMQTTConnState.INIT

    var socket: GCDAsyncSocket?

    var reader: CocoaMQTTReader?

    //global message id
    
    var gmid: UInt16 = 1

    //subscribed topics<commit_msg>CocoaMQTT was retaining its delegate, causing a retain cycle when the delegate is the owner of the CocoaMQTT instance. Here, we break that cycle by making the delegate an unretained (weak) property. This has the side effect of requiring the CocoaMQTTDelegate protocol to be implemented by a class (not a struct or enum for example), so we mark the CocoaMQTTDelegate as such.<commit_after>//
//  CocoaMQTT.swift
//  CocoaMQTT
//
//  Created by <NAME><<EMAIL>> on 14/7/28.
//  Copyright (c) 2014年 slimpp.io. All rights reserved.
//

import Foundation

/**
 * MQTT Delegate
 */
protocol CocoaMQTTDelegate : class {

    /**
     * MQTT connected with server
     */
    func mqtt(mqtt: CocoaMQTT, didConnect host: String, port: Int)

    func mqtt(mqtt: CocoaMQTT, didConnectAck ack: CocoaMQTTConnAck)

    func mqtt(mqtt: CocoaMQTT, didPublishMessage message: CocoaMQTTMessage, id: UInt16)

    func mqtt(mqtt: CocoaMQTT, didReceiveMessage message: CocoaMQTTMessage, id: UInt16 )

    func mqtt(mqtt: CocoaMQTT, didSubscribeTopic topic: String)

    func mqtt(mqtt: CocoaMQTT, didUnsubscribeTopic topic: String)

    func mqttDidPing(mqtt: CocoaMQTT)

    func mqttDidReceivePong(mqtt: CocoaMQTT)

    func mqttDidDisconnect(mqtt: CocoaMQTT, withError err: NSError)

}

/**
 * Blueprint of the MQTT client
 */
protocol CocoaMQTTClient {

    var host: String { get set }

    var port: UInt16 { get set }

    var clientId: String { get }

    var username: String? {get set}

    var password: String? {get set}

    var cleansess: Bool {get set}

    var keepAlive: UInt16 {get set}

    var willMessage: CocoaMQTTWill? {get set}

    func connect() -> Bool

    func publish(topic: String, withString string: String, qos: CocoaMQTTQOS) -> UInt16

    func publish(message: CocoaMQTTMessage) -> UInt16

    func subscribe(topic: String, qos: CocoaMQTTQOS) -> UInt16

    func unsubscribe(topic: String) -> UInt16

    func ping()

    func disconnect()

}


/**
 * QOS
 */
enum CocoaMQTTQOS: UInt8 {

    case QOS0 = 0

    case QOS1

    case QOS2
}

/**
 * Connection State
 */
enum CocoaMQTTConnState: UInt8 {

    case INIT = 0

    case CONNECTING

    case CONNECTED

    case DISCONNECTED
}


/**
 * Conn Ack
 */
enum CocoaMQTTConnAck: UInt8 {

    case ACCEPT  = 0

    case PROTO_VER

    case INVALID_ID

    case SERVER

    case CREDENTIALS

    case AUTH

}

/**
 * asyncsocket read tag
 */
enum CocoaMQTTReadTag: Int {

    case TAG_HEADER = 0

    case TAG_LENGTH

    case TAG_PAYLOAD

}

/**
 * Main CocoaMQTT Class
 *
 * Notice: GCDAsyncSocket need delegate to extend NSObject
 */
class CocoaMQTT: NSObject, CocoaMQTTClient, GCDAsyncSocketDelegate, CocoaMQTTReaderDelegate {

    //client variables

    var host = "localhost"

    var port: UInt16 = 1883

    var clientId: String

    var username: String?

    var password: String?

    var cleansess: Bool = true

    //keep alive

    var keepAlive: UInt16 = 0

    var aliveTimer: MSWeakTimer?

    //will message

    var willMessage: CocoaMQTTWill?

    //delegate

    weak var  delegate: CocoaMQTTDelegate?

    //socket and connection

    var connState = CocoaMQTTConnState.INIT

    var socket: GCDAsyncSocket?

    var reader: CocoaMQTTReader?

    //global message id
    
    var gmid: UInt16 = 1

    //subscribed topics
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