// backend/config/mysqlPool.js
import mysql from 'mysql2/promise';
import dotenv from 'dotenv';
import { fileURLToPath } from 'url';
import path from 'path';

const __filename = fileURLToPath(import.meta.url);
const __dirname  = path.dirname(__filename);

// load .env.<env>
dotenv.config({ path: path.resolve(__dirname, '..', `.env.${process.env.NODE_ENV || 'development'}`) });

/** decide: socket vs TCP */
let poolConfig;
if (process.env.DB_SOCKET) {
  poolConfig = { socketPath: process.env.DB_SOCKET };
} else {
  poolConfig = {
    host : process.env.DB_HOST || '127.0.0.1',
    port : process.env.DB_PORT || 3306,
    user : process.env.DB_USER || 'root',
    password: process.env.DB_PASSWORD || '',
  };
}
poolConfig.database            = process.env.DB_NAME || 'user_profile_db';
poolConfig.waitForConnections  = true;
poolConfig.connectionLimit     = 10;

export default mysql.createPool(poolConfig);