// webSocket服务端
const http = require('http');
const { Server } = require('socket.io');

module.exports = (app) => {
    // 创建HTTP服务器并监听8010端口
    const server = http.createServer(function (req, res) {
        if (req.url === '/') {
            res.writeHead(200, {'Content-Type': 'text/plain'});
            res.end('Hello World!');
        }
    }).listen(app.config.webSocketServer.port);

    let io = new Server(server, {
        cors: {
            origin: "http://127.0.0.1", // 生产环境应指定具体域名
            methods: ["GET", "POST"]
        },
        // path: app.config.webSocketServer.path,
        transports: ['websocket', 'polling'],
        connectionStateRecovery: {}
    });
    
    console.log(`websocket: ${ app.config.webSocketServer.ip }服务器已启动，监听端口：${ app.config.webSocketServer.port }`);

    const socketEmitter = app.middleware.shunt.socketEmitter();
    const utils = app.middleware.utils;

    io.on('connection', (socket) => {
        socket.on('message', (cardID) => {
            if(socketEmitter.listeners(cardID).length !== 0) {
                socketEmitter.removeAllListeners(cardID);
            };
            socketEmitter.on(cardID, (msg) => {
                socket.emit(cardID, msg);
            });
        });
    });

    io.on('error', (err) => {
        utils.log('../../webSocketLog', err);
        io = new Server(app.config.webSocketServer.port, {
            cors: true,
            connectionStateRecovery: {}
        });
    });
};