require('dotenv').config();
const database = require('../config/database');
const logger = require('../utils/logger');

async function runMigrations() {
  try {
    await database.connect();
    logger.info('Starting database migrations...');

    // Create users table
    await database.query(`
      CREATE TABLE IF NOT EXISTS users (
        id INT AUTO_INCREMENT PRIMARY KEY,
        username VARCHAR(50) UNIQUE NOT NULL,
        email VARCHAR(100) UNIQUE NOT NULL,
        password_hash VARCHAR(255) NOT NULL,
        role ENUM('admin', 'operator', 'viewer') DEFAULT 'viewer',
        status ENUM('active', 'inactive') DEFAULT 'active',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create devices table
    await database.query(`
      CREATE TABLE IF NOT EXISTS devices (
        id INT AUTO_INCREMENT PRIMARY KEY,
        device_id VARCHAR(100) UNIQUE NOT NULL,
        name VARCHAR(100) NOT NULL,
        device_type VARCHAR(50) NOT NULL,
        status ENUM('online', 'offline') DEFAULT 'offline',
        ai_model_config JSON,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create device_data table
    await database.query(`
      CREATE TABLE IF NOT EXISTS device_data (
        id BIGINT AUTO_INCREMENT PRIMARY KEY,
        device_id VARCHAR(100) NOT NULL,
        raw_data JSON NOT NULL,
        timestamp DATETIME NOT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create alerts table
    await database.query(`
      CREATE TABLE IF NOT EXISTS alerts (
        id BIGINT AUTO_INCREMENT PRIMARY KEY,
        device_id VARCHAR(100),
        type VARCHAR(50) NOT NULL,
        severity ENUM('info', 'warning', 'critical') NOT NULL,
        message TEXT NOT NULL,
        status ENUM('active', 'resolved') DEFAULT 'active',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create alert_rules table
    await database.query(`
      CREATE TABLE IF NOT EXISTS alert_rules (
        id INT AUTO_INCREMENT PRIMARY KEY,
        name VARCHAR(100) NOT NULL,
        description TEXT,
        device_type VARCHAR(50),
        condition_type ENUM('threshold', 'anomaly', 'pattern') NOT NULL,
        condition_config JSON NOT NULL,
        severity ENUM('info', 'warning', 'critical') NOT NULL,
        actions JSON,
        status ENUM('active', 'inactive') DEFAULT 'active',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create healing_rules table
    await database.query(`
      CREATE TABLE IF NOT EXISTS healing_rules (
        id INT AUTO_INCREMENT PRIMARY KEY,
        name VARCHAR(100) NOT NULL,
        description TEXT,
        trigger_condition JSON NOT NULL,
        healing_actions JSON NOT NULL,
        priority INT DEFAULT 1,
        status ENUM('active', 'inactive') DEFAULT 'active',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create healing_actions table
    await database.query(`
      CREATE TABLE IF NOT EXISTS healing_actions (
        id BIGINT AUTO_INCREMENT PRIMARY KEY,
        rule_id INT,
        device_id VARCHAR(100),
        action_type VARCHAR(50) NOT NULL,
        action_config JSON NOT NULL,
        status ENUM('pending', 'in_progress', 'completed', 'failed') DEFAULT 'pending',
        result JSON,
        started_at TIMESTAMP NULL,
        completed_at TIMESTAMP NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create ai_suggestions table
    await database.query(`
      CREATE TABLE IF NOT EXISTS ai_suggestions (
        id BIGINT AUTO_INCREMENT PRIMARY KEY,
        device_id VARCHAR(100),
        suggestion_type ENUM('maintenance', 'optimization', 'alert', 'healing') NOT NULL,
        title VARCHAR(200) NOT NULL,
        description TEXT NOT NULL,
        priority ENUM('low', 'medium', 'high', 'critical') DEFAULT 'medium',
        confidence_score DECIMAL(5,2),
        status ENUM('pending', 'approved', 'rejected', 'implemented') DEFAULT 'pending',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create notifications table
    await database.query(`
      CREATE TABLE IF NOT EXISTS notifications (
        id BIGINT AUTO_INCREMENT PRIMARY KEY,
        user_id INT,
        type VARCHAR(50) NOT NULL,
        title VARCHAR(200) NOT NULL,
        message TEXT NOT NULL,
        channel ENUM('email', 'sms', 'in_app') NOT NULL,
        status ENUM('pending', 'sent', 'failed') DEFAULT 'pending',
        sent_at TIMESTAMP NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create device_thresholds table
    await database.query(`
      CREATE TABLE IF NOT EXISTS device_thresholds (
        id INT AUTO_INCREMENT PRIMARY KEY,
        device_id VARCHAR(100) NOT NULL,
        parameter_name VARCHAR(100) NOT NULL,
        min_value DECIMAL(10,2),
        max_value DECIMAL(10,2),
        warning_min DECIMAL(10,2),
        warning_max DECIMAL(10,2),
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create user_sessions table
    await database.query(`
      CREATE TABLE IF NOT EXISTS user_sessions (
        id BIGINT AUTO_INCREMENT PRIMARY KEY,
        user_id INT NOT NULL,
        session_token VARCHAR(255) UNIQUE NOT NULL,
        expires_at TIMESTAMP NOT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create audit_logs table
    await database.query(`
      CREATE TABLE IF NOT EXISTS audit_logs (
        id BIGINT AUTO_INCREMENT PRIMARY KEY,
        user_id INT,
        action VARCHAR(100) NOT NULL,
        resource_type VARCHAR(50),
        resource_id VARCHAR(100),
        details JSON,
        ip_address VARCHAR(45),
        user_agent TEXT,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    // Create system_config table
    await database.query(`
      CREATE TABLE IF NOT EXISTS system_config (
        id INT AUTO_INCREMENT PRIMARY KEY,
        config_key VARCHAR(100) UNIQUE NOT NULL,
        config_value TEXT,
        description TEXT,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
      )
    `);

    logger.info('Database migrations completed successfully');
  } catch (error) {
    logger.error('Migration failed:', error);
    process.exit(1);
  } finally {
    await database.disconnect();
  }
}

if (require.main === module) {
  runMigrations();
}

module.exports = { runMigrations };