import { UTSAndroid } from "io.dcloud.uts";
import MqttClient from 'org.eclipse.paho.client.mqttv3.MqttClient';
import MqttConnectOptions from 'org.eclipse.paho.client.mqttv3.MqttConnectOptions';
import IMqttDeliveryToken from 'org.eclipse.paho.client.mqttv3.IMqttDeliveryToken';
import MqttMessage from 'org.eclipse.paho.client.mqttv3.MqttMessage';
import MqttCallback from 'org.eclipse.paho.client.mqttv3.MqttCallback';
// import Throwable from 'java.lang.Throwable'
import Throwable from 'kotlin.Throwable';
import MqttException from 'org.eclipse.paho.client.mqttv3.MqttException';
import MqttCallbackExtended from 'org.eclipse.paho.client.mqttv3.MqttCallbackExtended'
import KotlinCharArray from 'kotlin.CharArray';
import KotlinChar from 'kotlin.Char';
import CharArrayWriter from 'java.io.CharArrayWriter';
import PowerManager from 'android.os.PowerManager';
import Context from 'android.content.Context';
import { startConnectedDeviceService, closeConnectedDeviceService } from './service'
import Charsets from 'kotlin.text.Charsets'
import JSONObject from 'com.alibaba.fastjson.JSONObject'
import Thread from 'java.lang.Thread'
import Runnable from 'java.lang.Runnable';


class myRunnable implements Runnable {
	constructor() {
	}
	override run() : void {
		const mqtt = MqttManager.getInstance(null)
		mqtt.connectMqtt()
	}
}

type MqttManagerOption = {
	host : string,
	clientId : string,
	userName : string,
	password : string,
	cleanSession ?: boolean, // false 创建可持续会话，前提是clientId一直保持不变，
	automaticReconnect ?: boolean,
	heartBeat ?: Int,
	timeOut ?: Int,
	keepAlive ?: boolean, // 是否保活
	notificationContentText ?: string, // 通知文本
	notificationContentTitle ?: string  // 通知title
	offPeriodMsg ?: callbackTypeOff  // cleanSession  为false 的时候，重新连接会接收到断开期间的消息
}
//cleanSession 解释
//持久会话：当客户端连接到代理服务器时，如果启用了持久会话，代理服务器会记录客户端的订阅信息，即使客户端断开连接，代理服务器也会保存这些订阅信息。当客户端再次连接到代理服务器时，它会恢复之前的订阅信息，并接收它断开连接时的所有未接收的消息。
//清除会话：当客户端连接到代理服务器时，如果启用了清除会话，代理服务器不会保存客户端的订阅信息。当客户端断开连接时，代理服务器会删除与该客户端相关的所有信息。


type callbackType = (res : UTSJSONObject) => void

type callbackTypeOff = (topic : string, res : UTSJSONObject) => void

type subscribeItemType = {
	value : Int,
	qos : Int
}


let subscribeCallback_1 : callbackType | null = null // 订阅成功回调
let subscribeCallback_2 : callbackType | null = null // 订阅成功回调
let subscribeCallback_3 : callbackType | null = null // 订阅成功回调
let subscribeCallback_4 : callbackType | null = null // 订阅成功回调
let subscribeCallback_5 : callbackType | null = null // 订阅成功回调
let unubscribeCallback : callbackType | null = null // 取消订阅回调
let subscribeMap = {}
let connectCallback : callbackType | null = null  // 连接回调，包含成功和失败
let publicCallback : callbackType | null = null  // 发布消息回调，包含成功和失败
let disConnectCallback : callbackType | null = null // 主动断开连接后的回调
let onDisconnectCallback : callbackType | null = null  // 监听连接中途断开的回调
let onReconnectCallback : callbackType | null = null  // 监听自动重新连接的回调
let closeClient : Boolean = false // 是否关闭客户端

class MqttManager {
	HOST : string; // 主机ip
	CLIENT_ID : string; // 客户端id
	USER_NAME : string; // 用户名
	PASSWAORD : string; // 密码
	CLEAN_SESSION : boolean; // 是否清除会话，默认是false
	AUTO_MATICRECONNECT : boolean; // 是否自动重连，默认是true
	HEART_BEAT : Int; // 默认60秒
	TIME_OUT : Int; // 默认30秒
	subscribeList : Array<string> = [] // 订阅列表
	mqttClient : MqttClient; // 唯一客户端
	manageOption : MqttManagerOption; // 外部传进来的条件
	static instance : MqttManager | null = null; // MqttManager单例

	static getInstance(option : MqttManagerOption | null) : MqttManager {
		if (MqttManager.instance == null) {
			var temp = option as MqttManagerOption
			MqttManager.instance = new MqttManager(temp);
		}
		return MqttManager.instance as MqttManager;
	}

	constructor(option : MqttManagerOption) {
		this.manageOption = option
		this.HOST = option.host
		this.CLIENT_ID = option.clientId
		this.USER_NAME = option.userName
		this.PASSWAORD = option.password
		// 设置默认
		this.CLEAN_SESSION = option.cleanSession == null ? false : option.cleanSession as boolean
		this.AUTO_MATICRECONNECT = option.automaticReconnect == null ? true : option.automaticReconnect as boolean
		this.HEART_BEAT = option.heartBeat == null ? 60 : option.heartBeat as Int
		this.TIME_OUT = option.timeOut == null ? 30 : option.timeOut as Int
		this.mqttClient = new MqttClient(option.host, option.clientId, null);
	}

	connectMqtt() : void {
		let callback = connectCallback as callbackType
		let res : UTSJSONObject
		try {
			const connOpts : MqttConnectOptions = new MqttConnectOptions();
			connOpts.setCleanSession(this.CLEAN_SESSION); // 原来是true
			connOpts.setAutomaticReconnect(this.AUTO_MATICRECONNECT); // 自动重连
			connOpts.setKeepAliveInterval(this.HEART_BEAT) // 心跳
			connOpts.setConnectionTimeout(this.TIME_OUT)  // 设置连接超时
			connOpts.setMaxReconnectDelay(10000)  // 设置最大重新连接间隔（在无法连接时等待的最大毫秒数）
			connOpts.setUserName(this.USER_NAME);
			connOpts.setPassword(this.PASSWAORD.toCharArray());
			this.mqttClient.connect(connOpts);
			this.mqttClient.setCallback(new myMqttCallback());
			res = {
				"code": 200,
				"message": "连接成功",
				"clientId": this.CLIENT_ID
			}
		} catch (e) {
			console.log(e)
			let callback = connectCallback as callbackType
			res = {
				"code": 500,
				"message": '连接失败，具体原因请查看控制台'
			}
		}
		callback(res)
	}
	subscribe(topic : string, qos : Int) : void {
		// 订阅主题
		try {
			this.subscribeList.push(topic)
			console.log(this.subscribeList)
			this.mqttClient.subscribe(topic, qos);
		} catch (e) {
			console.log(e.message)
		}

	}

	unsubscribe(topic : string) : void { // unbscribeCallback
		let callback = unubscribeCallback as callbackType
		let res : UTSJSONObject
		try {
			this.mqttClient.unsubscribe(topic);
			// 删除订阅
			for (let i = 0; i < this.subscribeList.length; i++) {
				if (this.subscribeList[i] == topic) {
					this.subscribeList.splice(i, 1)
				}
			}
			res = {
				"code": 200,
				"message": `取消订阅成功`,
				"topic": topic
			}
		} catch (e) {
			res = {
				"code": 500,
				"message": e.message,
				"topic": topic
			}
		}
		callback(res)
	}

	isConnected() : boolean {
		return this.mqttClient.isConnected()
	}

	disconnectMqtt() : void {
		try {
			this.mqttClient.disconnect();
			if (closeClient == true) {
				this.mqttClient.close();
			}
			// MqttManager.instance = null // 清空的目的是为了可以让再次重连
			let callback = disConnectCallback as callbackType
			let res : UTSJSONObject
			res = {
				"code": 200,
				"message": '断开连接成功',
			}
			callback(res)
		} catch (e) {
			let callback = disConnectCallback as callbackType
			let res : UTSJSONObject
			res = {
				"code": 500,
				"message": e.message,
			}
			callback(res)
		}
	}

	publishMessage(topic : string, message : string, qos : Int) : void {
		try {
			const bytes : ByteArray = message.toByteArray(Charsets.UTF_8)
			const mqttMessage : MqttMessage = new MqttMessage(bytes);
			mqttMessage.setQos(qos);
			this.mqttClient.publish(topic, mqttMessage);
		} catch (e) {
			console.log(e)
			// 消息发送失败
			let callback = publicCallback as callbackType
			let res : UTSJSONObject
			res = {
				"code": 500,
				"message": e.message,
				"clientId": this.CLIENT_ID
			}
			callback(res)
		}
	}
}

// 回调汇总
class myMqttCallback extends MqttCallback implements MqttCallbackExtended {
	override connectionLost(cause : Throwable) : void {
		// 连接丢失的处理(不包含自己主动断开)
		console.log(cause)
		// 可以在这里手动重新连接，暂时先用自动重新连接
		if (onDisconnectCallback !== null) {
			let callback = onDisconnectCallback as callbackType
			let res : UTSJSONObject
			res = {
				"code": 500,
				"message": cause.message
			}
			callback(res)
		}
	}

	override messageArrived(topic : string, message : MqttMessage) : void {
		// 接收到消息的处理  
		// 返回的topic 是以mobile/location
		try {
			// 只接收订阅返回的，如果有多余的，肯定是订阅过
			// console.log('格式化之前topic', topic)
			let res : UTSJSONObject
			// 如果不是json,直接返回二进制
			try {
				res = JSON.parse(new String(message.getPayload())) as UTSJSONObject
			} catch (e) {
				res = {
					data: JSONObject.toJSON(message.getPayload())
				}
			}
			console.log(res, topic)
			const mqtt = MqttManager.getInstance(null)
			if (mqtt.subscribeList.includes(topic)) {
				let topicItem = subscribeMap[topic] as subscribeItemType
				let topicNo = topicItem.value
				if (topicNo == 1) {
					let callback = subscribeCallback_1 as callbackType
					callback(res)
				} else if (topicNo == 2) {
					let callback = subscribeCallback_2 as callbackType
					callback(res)
				} else if (topicNo == 3) {
					let callback = subscribeCallback_3 as callbackType
					callback(res)
				} else if (topicNo == 4) {
					let callback = subscribeCallback_4 as callbackType
					callback(res)
				} else {
					let callback = subscribeCallback_5 as callbackType
					callback(res)
				}
			} else {
				if (mqtt.manageOption.offPeriodMsg !== null && mqtt.CLEAN_SESSION == false) {
					let callback = mqtt.manageOption.offPeriodMsg as callbackTypeOff
					callback(topic, res)
				}

			}
		} catch (e) {
			console.log(e.message)
		}

	}

	override deliveryComplete(token : IMqttDeliveryToken) : void {
		// 消息发送成功的处理
		try {
			let callback = publicCallback as callbackType
			let res : UTSJSONObject
			res = {
				"code": 200,
				"message": '消息发送成功'
			}
			callback(res)
		} catch (e) {
			console.log('消息发送成功回调catch', e.message)
		}
	}
	// 自动重连
	override connectComplete(reconnect : boolean, serverURI : string) : void {
		// 重连成功后把之前的重新订阅
		console.log('reconnect', reconnect, serverURI)
		let res : UTSJSONObject
		if (reconnect) {
			// const mqtt = MqttManager.getInstance(null)
			// console.log('oldSubscribeList', mqtt.subscribeList)
			// for (let i = 0; i < mqtt.subscribeList.length; i++) {
			// 	let topicItem = subscribeMap[mqtt.subscribeList[i].split('/').join('.')] as subscribeItemType
			// 	let qos = topicItem.qos
			// 	mqtt.mqttClient.subscribe(mqtt.subscribeList[i], qos)
			// }
			if (onReconnectCallback !== null) {
				let callback = onReconnectCallback as callbackType
				res = {
					"code": 200,
					"message": '自动重新连接成功'
				}
				callback(res)
			}

		} else {
			if (onReconnectCallback !== null) {
				let callback = onReconnectCallback as callbackType
				res = {
					"code": 500,
					"message": '自动重新连接失败，会持续进行重连...'
				}
				callback(res)
			}
		}

	}
}



// 对外暴露的Api
@UTSJS.keepAlive
export function connect(option : MqttManagerOption, callback : callbackType) {
	const mqtt = MqttManager.getInstance(option)
	// 如果已经连接
	if (!mqtt.isConnected()) {
		connectCallback = callback
		if (option.keepAlive == true) {
			startConnectedDeviceService(option.notificationContentTitle, option.notificationContentText)
		}
		new Thread(new myRunnable()).start();
	} else {
		let res : UTSJSONObject = {
			"code": 200,
			"message": "连接成功(301)",
			"clientId": mqtt.CLIENT_ID
		}
		callback(res)
	}
}

@UTSJS.keepAlive
export function subscribe(topic : string, qos : Int, callback : callbackType) {
	if (MqttManager.instance == null || MqttManager.instance!.isConnected() == false) {
		console.log('请先连接')
		return
	}
	const mqtt = MqttManager.instance as MqttManager
	if (mqtt.subscribeList.includes(topic)) {
		// 已经订阅了，如果有其他地方需要订阅相同主题，就覆盖掉之前的回调函数
		let topicItem = subscribeMap[topic] as subscribeItemType
		let topicNo = topicItem.value
		if (topicNo == 1) {
			subscribeCallback_1 = callback
		} else if (topicNo == 2) {
			subscribeCallback_2 = callback
		} else if (topicNo == 3) {
			subscribeCallback_3 = callback
		} else if (topicNo == 4) {
			subscribeCallback_4 = callback
		} else {
			subscribeCallback_5 = callback
		}
		return
	}
	let value : Int
	if (subscribeCallback_1 == null) {
		subscribeCallback_1 = callback
		value = 1
	} else if (subscribeCallback_2 == null) {
		subscribeCallback_2 = callback
		value = 2
	} else if (subscribeCallback_3 == null) {
		subscribeCallback_3 = callback
		value = 3
	} else if (subscribeCallback_4 == null) {
		subscribeCallback_4 = callback
		value = 4
	} else {
		subscribeCallback_5 = callback
		value = 5
	}
	let temp : subscribeItemType = {
		value: value,
		qos: qos
	}
	subscribeMap[topic] = temp
	mqtt.subscribe(topic, qos);
}

@UTSJS.keepAlive
export function unSubscribe(topic : string, callback : callbackType) {
	if (MqttManager.instance == null || MqttManager.instance!.isConnected() == false) {
		console.log('请先连接')
		return
	}
	unubscribeCallback = callback
	const mqtt = MqttManager.instance as MqttManager
	if (mqtt.subscribeList.includes(topic)) {
		// 确实订阅过, 去取消订阅
		let temp = subscribeMap[topic] as subscribeItemType
		let topicNo = temp.value
		if (topicNo == 1) {
			subscribeCallback_1 = null
		} else if (topicNo == 2) {
			subscribeCallback_2 = null
		} else if (topicNo == 3) {
			subscribeCallback_3 = null
		} else if (topicNo == 4) {
			subscribeCallback_4 = null
		} else {
			subscribeCallback_5 = null
		}
		mqtt.unsubscribe(topic)
	} else {
		console.log('您没有订阅过该主题')
	}

}

@UTSJS.keepAlive
export function publishMessage(topic : string, qos : Int, message : string, callback : callbackType) {
	if (MqttManager.instance == null || MqttManager.instance!.isConnected() == false) {
		console.log('请先连接')
		return
	}
	const mqtt = MqttManager.instance as MqttManager
	publicCallback = callback
	mqtt.publishMessage(topic, message, qos);
}

@UTSJS.keepAlive
export function disConnect(callback : callbackType, closeClient_ : Boolean) {
	const mqtt = MqttManager.instance as MqttManager
	closeClient = closeClient_
	disConnectCallback = callback
	// 关闭服务
	closeConnectedDeviceService()
	mqtt.disconnectMqtt();
}

@UTSJS.keepAlive
export function onConnectLost(callback : callbackType) {
	onDisconnectCallback = callback
}

@UTSJS.keepAlive
export function onReconnect(callback : callbackType) {
	onReconnectCallback = callback
}

export function isConnected() : Boolean {
	if (MqttManager.instance == null || MqttManager.instance!.isConnected() == false) {
		return false
	} else {
		return true
	}
}

export function getConfig() {
	if (MqttManager.instance == null || MqttManager.instance!.isConnected() == false) {
		return {
			code: 500,
			message: '请先连接'
		}
	}
	const mqtt = MqttManager.instance as MqttManager
	return {
		host: mqtt.HOST,
		clientId: mqtt.CLIENT_ID,
		userName: mqtt.USER_NAME,
		password: mqtt.PASSWAORD,
		cleanSession: mqtt.CLEAN_SESSION, // false 创建可持续会话，前提是clientId一直保持不变，
		automaticReconnect: mqtt.AUTO_MATICRECONNECT,
		heartBeat: mqtt.HEART_BEAT,
		timeOut: mqtt.TIME_OUT,
		subscribeList: mqtt.subscribeList
	}
}