#!/usr/bin/env node

const fs = require('fs').promises;
const path = require('path');

// Cron Setup and Backup Usage Guide
const cronGuide = {
  // Show cron setup instructions
  showCronSetup() {
    console.log('⏰ CRON JOB SETUP GUIDE');
    console.log('=======================\n');
    
    console.log('1. 📝 EDIT CRONTAB:');
    console.log('   crontab -e');
    console.log('');
    
    console.log('2. 📋 ADD BACKUP JOB (choose one):');
    console.log('');
    console.log('   # Daily backup at 2 AM');
    console.log('   0 2 * * * cd /Users/hongchangyu/Downloads/App\\ Projects/Cultural\\ Shift\\ Sandbox/deploy/backend && node comprehensive-backup.js');
    console.log('');
    console.log('   # Weekly backup on Sunday at 3 AM');
    console.log('   0 3 * * 0 cd /Users/hongchangyu/Downloads/App\\ Projects/Cultural\\ Shift\\ Sandbox/deploy/backend && node comprehensive-backup.js');
    console.log('');
    console.log('   # Every 6 hours');
    console.log('   0 */6 * * * cd /Users/hongchangyu/Downloads/App\\ Projects/Cultural\\ Shift\\ Sandbox/deploy/backend && node comprehensive-backup.js');
    console.log('');
    
    console.log('3. ✅ VERIFY CRON JOBS:');
    console.log('   crontab -l');
    console.log('');
    
    console.log('4. 📊 CHECK CRON LOGS:');
    console.log('   tail -f /var/log/cron');
    console.log('   or');
    console.log('   grep CRON /var/log/syslog');
    console.log('');
  },
  
  // Show backup usage instructions
  showBackupUsage() {
    console.log('💾 BACKUP USAGE GUIDE');
    console.log('=====================\n');
    
    console.log('📋 CHECK AVAILABLE BACKUPS:');
    console.log('   node simple-automated-backup.js');
    console.log('   # Lists all backups with details');
    console.log('');
    
    console.log('🔍 VERIFY BACKUP INTEGRITY:');
    console.log('   node comprehensive-backup.js');
    console.log('   # Creates new backup and verifies integrity');
    console.log('');
    
    console.log('📊 BACKUP CONTENTS:');
    console.log('   - Database: All collections (subtitles, source texts, users)');
    console.log('   - Code: Frontend and backend files');
    console.log('   - Configuration: package.json, Dockerfile, etc.');
    console.log('   - Manifest: Backup metadata and verification info');
    console.log('');
    
    console.log('🔄 RESTORE FROM BACKUP:');
    console.log('   # Database only (safe)');
    console.log('   node restore-database.js <backup-name>');
    console.log('');
    console.log('   # Full restore (including code)');
    console.log('   node restore-comprehensive.js <backup-name>');
    console.log('');
  },
  
  // Show cron job examples
  showCronExamples() {
    console.log('📝 CRON JOB EXAMPLES');
    console.log('====================\n');
    
    console.log('⏰ TIME FORMAT: minute hour day month day-of-week command');
    console.log('');
    
    console.log('📅 COMMON SCHEDULES:');
    console.log('   0 2 * * *     # Daily at 2 AM');
    console.log('   0 */6 * * *   # Every 6 hours');
    console.log('   0 3 * * 0     # Weekly on Sunday at 3 AM');
    console.log('   0 1 1 * *     # Monthly on 1st at 1 AM');
    console.log('   */30 * * * *  # Every 30 minutes');
    console.log('');
    
    console.log('🔧 BACKUP COMMANDS:');
    console.log('   # Simple data backup');
    console.log('   node simple-automated-backup.js');
    console.log('');
    console.log('   # Comprehensive backup (data + code)');
    console.log('   node comprehensive-backup.js');
    console.log('');
    console.log('   # With logging');
    console.log('   node comprehensive-backup.js >> backup.log 2>&1');
    console.log('');
  },
  
  // Show backup locations
  showBackupLocations() {
    console.log('📁 BACKUP LOCATIONS');
    console.log('===================\n');
    
    const backupDir = path.join(__dirname, 'backups');
    console.log(`📂 Local backups: ${backupDir}`);
    console.log('');
    
    console.log('📋 BACKUP STRUCTURE:');
    console.log('   backups/');
    console.log('   ├── comprehensive-backup-2025-08-05T.../');
    console.log('   │   ├── database.json          # All database data');
    console.log('   │   ├── code/                  # All source code');
    console.log('   │   │   ├── backend/           # Backend files');
    console.log('   │   │   ├── frontend/          # Frontend files');
    console.log('   │   │   └── root/              # Root config');
    console.log('   │   ├── config/                # Configuration files');
    console.log('   │   └── manifest.json          # Backup metadata');
    console.log('   └── auto-backup-2025-08-05T.../');
    console.log('       └── database.json          # Data only');
    console.log('');
    
    console.log('💾 BACKUP TYPES:');
    console.log('   - comprehensive-backup-* : Data + Code + Config');
    console.log('   - auto-backup-*         : Data only (faster)');
    console.log('');
  },
  
  // Show how to check backup contents
  async showBackupContents() {
    console.log('🔍 CHECKING BACKUP CONTENTS');
    console.log('===========================\n');
    
    const backupDir = path.join(__dirname, 'backups');
    
    try {
      const backups = await fs.readdir(backupDir);
      
      if (backups.length === 0) {
        console.log('❌ No backups found');
        return;
      }
      
      console.log('📋 Available backups:');
      for (const backup of backups) {
        const backupPath = path.join(backupDir, backup);
        const stats = await fs.stat(backupPath);
        
        if (stats.isDirectory()) {
          console.log(`  📦 ${backup} (${stats.mtime.toLocaleString()})`);
          
          // Check if it's a comprehensive backup
          const manifestPath = path.join(backupPath, 'manifest.json');
          try {
            await fs.access(manifestPath);
            console.log(`    ✅ Comprehensive backup (data + code)`);
          } catch {
            console.log(`    📊 Data backup only`);
          }
        }
      }
      
    } catch (error) {
      console.log('❌ Could not read backup directory:', error.message);
    }
    
    console.log('');
    console.log('🔍 TO EXAMINE A SPECIFIC BACKUP:');
    console.log('   ls -la backups/comprehensive-backup-*/');
    console.log('   cat backups/comprehensive-backup-*/manifest.json');
    console.log('');
  }
};

// Main function
const main = async () => {
  console.log('🚀 CRON & BACKUP GUIDE');
  console.log('======================\n');
  
  // Show all guides
  cronGuide.showCronSetup();
  cronGuide.showBackupUsage();
  cronGuide.showCronExamples();
  cronGuide.showBackupLocations();
  await cronGuide.showBackupContents();
  
  console.log('🎯 QUICK START:');
  console.log('1. Set up cron: crontab -e');
  console.log('2. Add: 0 2 * * * cd /path/to/backend && node comprehensive-backup.js');
  console.log('3. Check backups: node simple-automated-backup.js');
  console.log('4. Restore if needed: node restore-database.js <backup-name>');
  console.log('');
  
  console.log('📞 NEED HELP?');
  console.log('- Check cron logs: tail -f /var/log/cron');
  console.log('- Test backup: node comprehensive-backup.js');
  console.log('- List backups: node simple-automated-backup.js');
};

// Run the guide
main();