import { getToken } from '@/utils/auth';
import { checkLoginLine } from '@/api/login';
import { getBaseUrl } from '@/utils/baseUrl';
import { MessageBox, Message } from 'element-ui';
import store from '../store';
import SockJS from 'sockjs-client';
import Stomp from 'stompjs';

const isDev = process.env.NODE_ENV === 'development';
const isTest = process.env.NODE_ENV === 'test';
const websocketUrl = `${getBaseUrl()}/joylink-websocket?token=`;
const reconnectInterval = [0, 0, 3000, 5000, 10000, 30000, 60000];
let notFirstConnect = false;

var StompClient = function (headers) {
    this.url = websocketUrl + getToken();
    this.headers = headers || {};
    this.subscribeMap = new Map(); // 已订阅，对象{dest:'', handler:function, sub: Object}
    this.connect();
};

StompClient.prototype = {
    socket: null,
    clientIns: null,
    url: '',
    status: false,
    sockStatus: 0,
    headers: {
        // 'X-Token': getToken()
    },
    count: 0,
    topic: '',
    onmessage: null,

    // 连接服务端
    connect() {
        return new Promise((resolve, reject) => {
            try {
                // 建立连接对象（还未发起连接）
                // （null, {transports:['websocket']}）解决连接关闭后xhr_streaming无限循环
                this.socket = new SockJS(websocketUrl + getToken(), null, {transports:['websocket', 'MozWebSocket']});

                // 获取 STOMP 子协议的客户端对象
                this.clientIns = Stomp.over(this.socket);

                this.closeStompDebug();

                // 向服务器发起websocket连接并发送CONNECT帧
                const that = this;
                this.clientIns.connect({ 'X-Token': getToken() }, () => {
                    if (notFirstConnect) {
                        Message.success('连接成功');
                    }
                    console.info('连接成功.');
                    that.count = 0;
                    that.status = true;

                    // 恢复订阅
                    that.subscribeMap.forEach((subscribe) => {
                        that.subscribe(subscribe.dest, subscribe.handler);
                    });

                    // sock断开回调
                    this.clientIns.ws.onclose = () => {
                        MessageBox.confirm('socket已经断开');
                        notFirstConnect = true;
                        checkLoginLine().then(() => {
                            this.status = false;
                            this.count++;
                            this.reconnect(this.count);
                        }).catch((err) => {
                            this.logOut(err);
                        });
                    };
                    resolve(this);
                }, () => {
                    checkLoginLine().then(() => {
                        this.connect();
                    }).catch((err) => {
                        this.logOut(err);
                    });
                });
            } catch (err) {
                reject(err);
            }
        });

    },
    logOut(err) {
        console.info(err);
        MessageBox.confirm('你已被登出，请重新登录', '确定登出', {
            confirmButtonText: '重新登录',
            showCancelButton: false,
            type: 'warning'
        }).then(() => {
            store.dispatch('FedLogOut').then(() => {
                location.reload();// 为了重新实例化vue-router对象 避免bug
            });
        });

    },
    // 恢复链接
    reconnect(count) {
        console.info(`尝试第${count || 1}次连接.`);
        Message.error(`正在尝试第${count || 1}次连接.`);
        const that = this;
        setTimeout(() => {
            that.connect().then(() => { }).catch(() => {
                that.count++;
                that.reconnect(that.count);
            });
        }, reconnectInterval[that.count] || reconnectInterval[reconnectInterval.length - 1] );

    },

    closeStompDebug() {
        if (this.clientIns) {
            if (isDev || isTest) {
                this.clientIns.debug = function (message) {
                    console.debug(message);
                };
            }
        }
    },

    // 订阅指定的topic
    subscribe(topic, onmessage, headers) {
        // const timeDelay = [1000, 2000, 5000, 10000];
        this.topic = topic;
        this.onmessage = onmessage;
        this.headers = headers;
        if (!this.status) {
            this.subscribeMap.set(topic, {dest: topic, handler: onmessage, sub: null});
        } else {
            const sub = this.clientIns.subscribe(topic, onmessage);
            this.subscribeMap.set(topic, {dest: topic, handler: onmessage, sub: sub});
        }
    },

    unsubscribe(topic) {
        const subscription = this.subscribeMap.get(topic);
        if (subscription && subscription.sub) {
            subscription.sub.unsubscribe();
            this.subscribeMap.delete(topic);
            console.log('取消订阅');
        } else if (subscription) {
            this.subscribeMap.delete(topic);
        }
    },

    // 发送消息
    send(url, msg) {
        if (this.status) {
            if (msg) {
                msg = JSON.stringify(msg);
                this.clientIns.send(url, {}, msg);
            } else {
                console.error('发送消息为空');
            }
        } else {
            setTimeout(() => {
                this.send(url, msg);
            }, 300);
        }
    },

    disconnect() {
        if (this.clientIns && this.clientIns.connected) {
            this.clientIns.disconnect();
            this.clientIns = null;
        }
        this.status = false;
        console.info('断开连接');
    }

};

export default StompClient;