//获取玩家区服数据
let mysqlcn = require('./mysqlcn.js');
let query = mysqlcn.query;
let http = require('http');
var qs = require('querystring');

let express = require('express');
let router = express.Router();

const timeout = 5000; // 设置超时时间为 5000 毫秒（5 秒）

let ser_list = {
    // shengtian:{
    //     time : 0,
    //     data : {}
    // } 
}


// 创建一个封装 http 请求的 Promise
function fetchDataFromServer(options, data) {
    return new Promise((resolve, reject) => {
        const req = http.request(options, (res) => {
            let data = '';

            res.on('data', (chunk) => {
                data += chunk;
            });

            res.on('end', () => {
                resolve(data);
            });
        });

        req.on('error', (e) => {
            reject(e);
        });
        req.write(data)
        req.end();
    });
}

// 创建一个超时的 Promise
function timeoutPromise(ms) {
    return new Promise((_, reject) => {
        setTimeout(() => {
            reject(new Error('请求超时'));
        }, ms);
    });
}

// 从多个 URL 获取数据，处理超时
async function fetchAllDataWithTimeout(args, vals, timeout) {
    if(vals.length <= 0){
        return []
    }
    const dataTable = new Array();
    const timeoutPromiseInstance = timeoutPromise(timeout);
    try {
        // 使用 Promise.race 处理超时
        for (let i = 0; i < vals.length; i++) {
            const url = vals[i];
            let data2game = JSON.stringify({
                "sid" : vals[i].id,
                "channel" : args.channel,
                "account" : args.account,
            })

            let opt = {
                method: "POST",
                host: vals[i].ip,
                port: vals[i].port,
                path: "/check_server",
                headers: {
                    "Content-Type": 'application/json',
                    "Content-Length": Buffer.byteLength(data2game, "utf8")
                }
            };
            dataTable[i] = {
                "server_id": vals[i].id,
                "server_name": vals[i].name,
                "state": 0,
                "ip": vals[i].ip,
                "port": vals[i].game,
                "create": false,
            }
            const fetchPromise = fetchDataFromServer(opt, data2game);
            try {
                // 使用 Promise.race 处理每个请求的超时
                const result = await Promise.race([fetchPromise, timeoutPromiseInstance]);
                // console.log(result)
                if(result != "Not Found") {
                    const obj = JSON.parse(result);
                    if (obj.state == 0){
                        dataTable[i].state = obj.open? 1:0
                        dataTable[i].create = obj.create
                    }
                }
            } catch(error) {
                // console.log(error);
            }
        }
        
        return dataTable;
    } catch (error) {
        console.error('Error:', error);
        throw error; // 重新抛出错误以便调用者处理
    }
}

let query_func = function(args, data, res){
    fetchAllDataWithTimeout(args, data, timeout)
    .then((dataTable) => {
        let returndata = JSON.stringify({
            'code': 0,
            'msg': "",
            'data': dataTable,
        });
        res.send(returndata);
    }).catch((error) => {
        console.error('Error:', error);
        res.send(JSON.stringify({ 'code':'400','msg':'稍后请求'}));
    });
}

let server_query_info = function(args,res){    
    args = args ? args : {}
    let channel = args.channel ? args.channel : ""
    const timestamp = Date.now();
    console.log(args)
    if (ser_list[channel] && ser_list[channel].time > timestamp){
        query_func(args, ser_list[channel].data, res)
    }
    else{
        let sql = `SELECT * FROM list where channel = "${channel}"`;
        query(sql,function(qerr,vals,fields_){
            if (qerr==null){
                ser_list[channel] = {
                    time:timestamp+60000,
                    data:vals,
                }
                query_func(args, vals, res)
            }
            else{
                console.log("打开mysql库中服务器列表失败");
                try{
                    res.send(JSON.stringify({ 'code':'400','msg':'稍后请求'}));
                }
                catch(e){
                    console.error('Error:', error);
                }
            }
        });
    }
}

router.post('/server_query_info', (req, res) => {
    // 解析请求体中的数据
    server_query_info(req.body, res)
});

module.exports = router;