const { Sequelize } = require('sequelize');
const config = require('./config.json');

/**
 * MySQL Connection Configuration via senaai.tech
 * Direct connection to MySQL server (port 11001)
 */
const dbConfig = config.database;

const sequelize = new Sequelize(
  dbConfig.database,
  dbConfig.username,
  dbConfig.password,
  {
    host: dbConfig.host,
    port: dbConfig.port,
    dialect: dbConfig.dialect,
    dialectOptions: {
      connectTimeout: 60000, // 60 seconds for slow networks
    },
    
    // Connection Pool Configuration
    pool: dbConfig.pool,
    
    // Logging
    logging: dbConfig.logging,
    
    // Query options
    define: {
      timestamps: true,
      underscored: true,
      freezeTableName: true,
    },
    
    // Timezone
    timezone: dbConfig.timezone,
    
    // Retry configuration
    retry: {
      max: 3,
      timeout: 3000,
    },
  }
);

/**
 * Test database connection
 */
const testConnection = async () => {
  try {
    await sequelize.authenticate();
    console.log(`✅ MySQL connection established successfully to ${dbConfig.host}:${dbConfig.port}`);
    return true;
  } catch (error) {
    console.error('❌ Unable to connect to MySQL:', error.message);
    return false;
  }
};

/**
 * Initialize database models
 */
const initializeDatabase = async () => {
  try {
    // Test connection first
    const isConnected = await testConnection();
    if (!isConnected) {
      throw new Error('Failed to connect to database');
    }
    
    // Note: Auto-sync disabled in production for safety
    console.log('✅ Database connection ready');
    
    return sequelize;
  } catch (error) {
    console.error('❌ Database initialization failed:', error.message);
    throw error;
  }
};

/**
 * Close database connection
 */
const closeConnection = async () => {
  try {
    await sequelize.close();
    console.log('✅ Database connection closed');
  } catch (error) {
    console.error('❌ Error closing database connection:', error.message);
  }
};

module.exports = {
  sequelize,
  testConnection,
  initializeDatabase,
  closeConnection,
};