const mysql = require('mysql2/promise');

// 打印数据库连接配置（不包含密码）
console.log('Connecting to database:', {
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  database: process.env.DB_DATABASE
});

const pool = mysql.createPool({
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  password: process.env.DB_PASSWORD,
  database: process.env.DB_DATABASE,
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0,
  // 添加额外的连接选项
  connectTimeout: 10000, // 10 seconds
  ssl: {
    // 允许自签名证书
    rejectUnauthorized: false
  }
});

// 测试数据库连接
pool.getConnection()
  .then(connection => {
    console.log('Database connected successfully');
    // 测试查询
    return connection.query('SELECT 1')
      .then(() => {
        console.log('Database query test successful');
        connection.release();
      })
      .catch(error => {
        console.error('Database query test failed:', error);
        connection.release();
        throw error;
      });
  })
  .catch(error => {
    console.error('Database connection error:', {
      code: error.code,
      errno: error.errno,
      sqlState: error.sqlState,
      sqlMessage: error.sqlMessage
    });
    // 如果是致命错误，终止程序
    process.exit(1);
  });

module.exports = pool;