/**
 * Migration Script: Add primary_role_info to user_profiles table
 * This adds a JSON column to store cached role information for fast lookups
 */
const { sequelize } = require('../config/database');
const { QueryTypes } = require('sequelize');

async function addPrimaryRoleInfo() {
  try {
    console.log('🔄 Starting migration: Add primary_role_info column...');
    
    // Test connection
    await sequelize.authenticate();
    console.log('✅ Database connection OK');
    
    // Check if column already exists
    const [columns] = await sequelize.query(
      `SHOW COLUMNS FROM user_profiles LIKE 'primary_role_info'`,
      { type: QueryTypes.SELECT }
    );
    
    if (columns) {
      console.log('⚠️  Column primary_role_info already exists, skipping...');
      process.exit(0);
    }
    
    // Add column
    await sequelize.query(`
      ALTER TABLE user_profiles 
      ADD COLUMN primary_role_info JSON DEFAULT NULL
      COMMENT 'Thông tin role chính: {role_id, role_code, role_name, school: {id, name}, class: {id, name}, grade: {id, name}}. Nếu null, check UserAssignment'
      AFTER district
    `);
    
    console.log('✅ Column primary_role_info added successfully');
    
    // Verify column was added
    const [result] = await sequelize.query(
      `DESCRIBE user_profiles`,
      { type: QueryTypes.SELECT }
    );
    
    console.log('\n📊 Table structure:');
    console.table(result);
    
    console.log('\n✅ Migration completed successfully!');
    console.log('\nNext steps:');
    console.log('1. Populate primary_role_info for existing students using StudentDetail');
    console.log('2. Run: node scripts/populate-primary-role-info.js');
    
    process.exit(0);
  } catch (error) {
    console.error('❌ Migration failed:', error.message);
    console.error(error.stack);
    process.exit(1);
  }
}

addPrimaryRoleInfo();