// 使用说明
/**
* // 在main.js或需要使用的地方引入并建立连接
* import { createSocket } from '@websocket'
* createSocket('wss://api.baidu.com')


* // 发送消息
* import { sendWSPush } from '@websocket'
* sendWSPush(data)

* // 接收消息
* const getsocketData = e => {  // 创建接收消息函数
*   const data = e && e.detail.data
*   console.log(data)
* }
* // 注册监听事件
* window.addEventListener('onmessageWS', getsocketData)

* // 在需要的时候卸载监听事件，比如离开页面
* window.removeEventListener('onmessageWS', getsocketData)
 */

let Socket = "";
let setIntervalWesocketPush = null;

/**
 * 建立websocket连接
 * @param {string} url ws地址
 */
export const createSocket = url => {
  Socket && Socket.close();
  if (!Socket) {
    console.log("建立websocket连接");
    Socket = new WebSocket(url);
    Socket.onopen = onopenWS;
    Socket.onmessage = onmessageWS;
    Socket.onerror = onerrorWS;
    Socket.onclose = oncloseWS;
  } else {
    console.log("websocket已连接");
  }
};

/**打开WS之后发送心跳 */
const onopenWS = () => {
  sendPing();
};

/**连接失败重连 */
const onerrorWS = () => {
  Socket.close();
  clearInterval(setIntervalWesocketPush);
  console.log("连接失败重连中");
  if (Socket.readyState !== 3) {
    Socket = null;
    createSocket();
  }
};

/**WS数据接收统一处理 */
const onmessageWS = e => {
  window.dispatchEvent(
    new CustomEvent("onmessageWS", {
      detail: {
        data: e.data
      }
    })
  );
};

/**
 * 发送数据但连接未建立时进行处理等待重发
 * @param {any} message 需要发送的数据
 */
const connecting = message => {
  setTimeout(() => {
    if (Socket.readyState === 0) {
      connecting(message);
    } else {
      Socket.send(JSON.stringify(message));
    }
  }, 1000);
};

/**
 * 发送数据
 * @param {any} message 需要发送的数据
 */
export const sendWSPush = message => {
  if (Socket !== null && Socket.readyState === 3) {
    Socket.close();
    createSocket();
  } else if (Socket.readyState === 1) {
    Socket.send(JSON.stringify(message));
  } else if (Socket.readyState === 0) {
    connecting(message);
  }
};

/**断开重连 */
const oncloseWS = () => {
  clearInterval(setIntervalWesocketPush);
  console.log("websocket已断开....正在尝试重连");
  if (Socket.readyState !== 2) {
    Socket = null;
    createSocket();
  }
};
/**发送心跳
 * @param {number} time 心跳间隔毫秒 默认5000
 * @param {string} ping 心跳名称 默认字符串ping
 */
export const sendPing = (time = 5000, ping = "ping") => {
  clearInterval(setIntervalWesocketPush);
  Socket.send(ping);
  setIntervalWesocketPush = setInterval(() => {
    Socket.send(ping);
  }, time);
};