const express = require('express');
const session = require('express-session');

require('dotenv').config();
const { env } = require("process");

const path = require('path');
const fs = require('fs');

const log4js = require('log4js');
log4js.configure('log4js-conf.json');
global.logger = log4js.getLogger();

const mysql = require('mysql2');
const { log } = require('console');

global.mysql_pool = mysql.createPool({
  connectionLimit : process.env.MYSQL_POOL_LIMIT || 10,
  host: process.env.MYSQL_HOST || 'localhost',
  database: process.env.MYSQL_DATABASE || 'sisai_world_db',
  user: process.env.MYSQL_USER || 'root',
  password: process.env.MYSQL_PASSWD || '',
  stringifyObjects: true,
});

process.env['NODE_TLS_REJECT_UNAUTHORIZED'] = 0; // Protected by Nginx.(for self-signed certificate. Comment out in product env.)

// Shutdown function to flush logs and clean up
const shutdown = () => {
  logger.info('Shutting down sisai server...');

  // Flush log4js logs
  log4js.shutdown((error) => {
    if (error) {
      console.error('Error shutting down log4js:', error);
    } else {
      console.log('Log4js has been shut down.');
    }

    // Exit the process after logs have been flushed
    process.exit();
  });
};

// Handle various shutdown signals
['SIGINT', 'SIGTERM', 'SIGHUP', 'SIGBREAK', 'exit'].forEach(signal => {
  process.on(signal, () => shutdown());
});

global.app = express();

app.use(express.static('views'));

app.use(session({
  secret: 'sisai_world_wEb_962287769',
  resave: false,
  saveUninitialized: true,
  cookie: { secure: false, maxAge: 1000*60*60*24*300 } //300 days
}));

logger.info('Sisai World running on nodejs:' + process.version)

var server
if(process.env.SSLKEY && process.env.SSLCRT){
  const options = {
    key: fs.readFileSync(process.env.SSLKEY),
    cert: fs.readFileSync(process.env.SSLCRT)
  };
  const https = require("https");
  server = https.createServer(options, app)
}else{
  const http = require("http");
  server = http.createServer({}, app)
}

const port = process.env.PORT || 443;
server.listen(port, () => {
    logger.info(`Started sisai world server: ${port}`);
});

//Map of session time
global.session_time = new Map();

const mainJS = './process.js';

function loadModule(modulePath) {
  const resolvedPath = path.resolve(modulePath);
  delete require.cache[require.resolve(resolvedPath)];
  return require(modulePath);
}

global.processModule = loadModule(mainJS);

// Watch for changes in the main module
fs.watchFile(path.resolve(__dirname, mainJS), () => {
  processModule = loadModule(mainJS);
  logger.info('mainJS reloaded');
});