const { Server } = require("socket.io")
const io = new Server({
    cors: {
        origin: ["*"]
    }
});

// 日志配置
const log4js = require("log4js");
log4js.configure({
    appenders: {
        console: { type: 'console' }, // 输出到控制台
        file: {
            type: 'dateFile',
            filename: "/var/www/socket/socket.log",
            pattern: '.yyyy-MM-dd', // 日期格式，按天滚动
            keepFileExt: true, // 保留文件扩展名
            numBackups: 30, // 保留的备份文件数量
            compress: true // 是否压缩旧的日志文件
        } // 输出到文件
    },
    categories: {
        default: { appenders: ['console', 'file'], level: 'debug' } // 默认使用控制台和文件输出，日志级别为 info
    }
});
const logger = log4js.getLogger('socket');

// 房间
const ROOMS = {}

// 中间件剔除无效房间号及满员情况
io.use((socket, next) => {
    const { roomID, name } = socket.handshake.auth;
    if (!roomID && !name) return next(new Error("invalid roomID or invalid userName"));
    const isTrue = ROOMS[roomID]
    if (isTrue) {
        // 有房间
        if (isTrue.length >= 2 && roomID != 'drawCanvas') {
            // 房间满
            return next(new Error("room is full"))
        } else {
            ROOMS[roomID].push(name)
            socket.join(roomID);
            socket.broadcast.to(roomID).emit("joined", { name: name, roomID: roomID, Length: ROOMS[roomID].length });
        }
    } else {
        // 无房间
        ROOMS[roomID] = []
        ROOMS[roomID].push(name)
        socket.join(roomID);
        socket.broadcast.to(roomID).emit("joined", { name: name, roomID: roomID, Length: ROOMS[roomID].length });
    }
    next();
})

io.on("connection", (socket) => {
    const { roomID, name } = socket.handshake.auth;
    logger.debug(`${name}加入${roomID}号房间人数:${ROOMS[roomID].length}`);
    // 监听其它信息
    socket.on("msg", (data) => {
        // 转发消息
        if(roomID === 'drawCanvas'){
           data.writeUInt8( socket._id , 0 );
        }
        socket.broadcast.to(roomID).emit("msg", data);
    });

    // 监听用户断开
    socket.on("disconnect", () => {
        const isHave = ROOMS[roomID].indexOf(name)
        if (isHave != -1) {
            if(roomID === 'drawCanvas') socket.broadcast.to(roomID).emit("msg", Buffer.from( [ socket._id , 8 ] ));
            socket.broadcast.to(roomID).emit("leaved", { name: name, roomID: roomID, Length: ROOMS[roomID].length });
            socket.leave(roomID)
            ROOMS[roomID].splice(isHave, 1)
            if (!ROOMS[roomID].length) delete ROOMS[roomID]
        }
        logger.debug(`${name}离开${roomID}号房间`);
        logger.debug(`所有房间：${JSON.stringify(ROOMS)}`);
    });
})

logger.debug(`socket服务启动：49800`)
io.listen(49800)