/**
 * Migration: Add is_approved field to devices table
 * This migration adds device approval functionality to the system
 */

'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    try {
      // Check if devices table exists first
      const tables = await queryInterface.showAllTables();
      if (!tables.includes('devices')) {
        console.log('⚠️  Devices table does not exist yet, skipping device approval migration...');
        return;
      }

      // Check if is_approved column already exists
      const tableDescription = await queryInterface.describeTable('devices');
      
      if (!tableDescription.is_approved) {
        // Add is_approved column to devices table
        await queryInterface.addColumn('devices', 'is_approved', {
          type: Sequelize.BOOLEAN,
          defaultValue: false,
          allowNull: false,
          comment: 'Whether the device is approved to send data'
        });

        // Add index for is_approved for better query performance
        await queryInterface.addIndex('devices', ['is_approved'], {
          name: 'devices_is_approved_idx'
        });

        // Approve all existing devices by default (backward compatibility)
        await queryInterface.sequelize.query(
          'UPDATE devices SET is_approved = true WHERE created_at < NOW()'
        );

        console.log('✅ Added is_approved field to devices table');
        console.log('✅ Approved all existing devices for backward compatibility');
      } else {
        console.log('⚠️  Column is_approved already exists, skipping...');
      }
    } catch (error) {
      console.log('⚠️  Migration skipped - tables may not exist yet:', error.message);
      // Don't throw error, just skip this migration if tables don't exist
    }
  },

  async down(queryInterface, Sequelize) {
    // Remove index first
    await queryInterface.removeIndex('devices', 'devices_is_approved_idx');
    
    // Remove the column
    await queryInterface.removeColumn('devices', 'is_approved');
    
    console.log('✅ Removed is_approved field from devices table');
  }
};