const { App, DEDICATED_COMPRESSOR_256KB } = require('uWebSockets.js')
const ROOMS = {}

// 日志配置
const log4js = require("log4js");
log4js.configure({
    appenders: { socket: { type: "file", filename: "./socket.log" } },
    categories: { default: { appenders: ["socket"], level: "debug" } }
});
const logger = log4js.getLogger('socket');

App().ws('/*', {
    compression: DEDICATED_COMPRESSOR_256KB,
    idleTimeout: 12,
    sendPingsAutomatically: true,
    upgrade: (res, req, context) => {
        const url = req.getUrl()
        const secWebSocketKey = req.getHeader('sec-websocket-key');
        const secWebSocketProtocol = req.getHeader('sec-websocket-protocol');
        const secWebSocketExtensions = req.getHeader('sec-websocket-extensions');
        const prams = url.split('/')
        if (prams.length > 1 && prams.length <= 3) {
            const ID = prams[1]
            const Name = prams[2]
            const isTrue = ROOMS[ID]
            if (isTrue) {
                // 有房间
                if (isTrue.length >= 2) {
                    // 房间满
                    res.close()
                } else {
                    ROOMS[ID].push(Name)
                    // 建立连接
                    res.upgrade({ url: url }, secWebSocketKey, secWebSocketProtocol, secWebSocketExtensions, context)
                }
            } else {
                // 无房间
                ROOMS[ID] = []
                ROOMS[ID].push(Name)
                // 建立连接
                res.upgrade({ url: url }, secWebSocketKey, secWebSocketProtocol, secWebSocketExtensions, context)
            }
        } else {
            res.close()
        }

    },
    /* 处理程序 */
    open: (socket) => {
        /* 订阅主题 */
        const { url } = socket
        if (!url) return
        const prams = url.split('/')
        const room = prams[1]
        const name = prams[2]
        socket.subscribe(`/${room}`)
        logger.debug(`${name}加入${room}号房间,人数：${ROOMS[room].length}`);
    },
    message: (socket, message,isBinary) => {
        // 转发消息
        const { url } = socket
        if (!url) return
        const room = url.split('/')[1]
        socket.publish(`/${room}`, message,isBinary);

        // buffer | string | blob
        // const txt = Buffer.from(message).toString()
        // console.log('接受消息',message,isBinary);
        // socket.send(message,isBinary)
    },
    close: (socket, code) => {
        // 连接关闭
        const { url } = socket
        if (url) {
            const prams = url.split('/')
            if (prams.length <= 1) return
            // 移除
            const ID = prams[1]
            const Name = prams[2]
            const isHave = ROOMS[ID].indexOf(Name)
            if (isHave != -1) {
                ROOMS[ID].splice(isHave, 1)
                if (!ROOMS[ID].length) delete ROOMS[ID]
            }
        }
        console.log('断开',ROOMS);
        logger.debug(`所有房间：${JSON.stringify(ROOMS)}`);
    }
}).listen(49800, token => {
    token ? logger.debug(`socket服务启动：49800`) : logger.debug(`socket服务启动失败`);
})