/**
 * Script: Sync Teacher Profiles
 * Mục đích: Tạo user_profile cho các teacher đã có sẵn trong hệ thống
 * 
 * Usage:
 *   node src/scripts/sync-teacher-profiles.js
 *   node src/scripts/sync-teacher-profiles.js --teacher-id=uuid
 *   node src/scripts/sync-teacher-profiles.js --dry-run
 */

require('dotenv').config();
const teacherProfileService = require('../services/teacherProfileService');
const { sequelize } = require('../config/database');

async function main() {
  console.log('🚀 Starting Teacher Profile Sync...\n');
  
  try {
    // Parse command line arguments
    const args = process.argv.slice(2);
    const dryRun = args.includes('--dry-run');
    const teacherIdArg = args.find(arg => arg.startsWith('--teacher-id='));
    const teacherId = teacherIdArg ? teacherIdArg.split('=')[1] : null;
    
    if (dryRun) {
      console.log('⚠️  DRY RUN MODE - No changes will be made\n');
    }
    
    if (teacherId) {
      console.log(`🎯 Syncing specific teacher: ${teacherId}\n`);
    } else {
      console.log('🔄 Syncing all teachers without profiles\n');
    }
    
    // Test database connection
    await sequelize.authenticate();
    console.log('✅ Database connection established\n');
    
    if (dryRun) {
      console.log('Dry run completed. Use without --dry-run to apply changes.');
      process.exit(0);
    }
    
    // Execute sync
    console.log('Processing...\n');
    const results = await teacherProfileService.syncExistingTeachers(teacherId);
    
    // Display results
    console.log('\n' + '='.repeat(60));
    console.log('📊 SYNC RESULTS');
    console.log('='.repeat(60));
    
    console.log(`\n✅ Success: ${results.success.length}`);
    if (results.success.length > 0) {
      results.success.forEach((item, index) => {
        console.log(`   ${index + 1}. ${item.teacher_code} → Profile created (user_id: ${item.user_id})`);
      });
    }
    
    console.log(`\n⏭️  Skipped: ${results.skipped.length}`);
    if (results.skipped.length > 0) {
      results.skipped.slice(0, 5).forEach((item, index) => {
        console.log(`   ${index + 1}. ${item.teacher_code} - ${item.reason}`);
      });
      if (results.skipped.length > 5) {
        console.log(`   ... and ${results.skipped.length - 5} more`);
      }
    }
    
    console.log(`\n❌ Failed: ${results.failed.length}`);
    if (results.failed.length > 0) {
      results.failed.forEach((item, index) => {
        console.log(`   ${index + 1}. ${item.teacher_code} - ${item.reason || item.error}`);
      });
    }
    
    console.log('\n' + '='.repeat(60));
    console.log('✅ Sync completed successfully!');
    console.log('='.repeat(60) + '\n');
    
    process.exit(0);
    
  } catch (error) {
    console.error('\n❌ Sync failed:', error.message);
    console.error(error.stack);
    process.exit(1);
  }
}

// Run
main();