const bcrypt = require('bcrypt');
const { db, initializeDatabase } = require('../src/database/db');
const { generateReadablePassword } = require('../src/utils/passwordGenerator');
const fs = require('fs').promises;
const path = require('path');

async function runMigrations() {
  console.log('Running database migrations...');
  
  try {
    // Initialize tables
    await initializeDatabase();
    
    // Create default admin user if none exists
    const adminExists = await db('admin_users').first();
    if (!adminExists) {
      // Generate a secure random password
      const generatedPassword = generateReadablePassword();
      const passwordHash = await bcrypt.hash(generatedPassword, 12); // Increased rounds for better security
      
      await db('admin_users').insert({
        username: 'admin',
        email: 'admin@example.com',
        password_hash: passwordHash,
        must_change_password: true, // Flag for forcing password change
        created_at: new Date()
      });
      
      // Save the generated password to a file for the user to retrieve
      const setupInfoPath = path.join(__dirname, '..', '..', 'ADMIN_CREDENTIALS.txt');
      const setupInfo = `
========================================
PicPeak Admin Credentials
========================================

Your admin account has been created with these credentials:

Username: admin
Password: ${generatedPassword}

IMPORTANT SECURITY NOTES:
1. You MUST change this password on first login
2. This file will be created only once
3. Store these credentials securely
4. Delete this file after noting the password

Login URL: ${process.env.ADMIN_URL || 'http://localhost:3001'}/admin

Generated on: ${new Date().toISOString()}
========================================
`;
      
      await fs.writeFile(setupInfoPath, setupInfo, 'utf8');
      
      console.log('\n========================================');
      console.log('✅ Admin user created successfully!');
      console.log('========================================');
      console.log('Username: admin');
      console.log(`Password: ${generatedPassword}`);
      console.log('\n⚠️  IMPORTANT:');
      console.log('1. Save these credentials securely');
      console.log('2. You will be required to change the password on first login');
      console.log('3. Credentials are also saved in: ADMIN_CREDENTIALS.txt');
      console.log('========================================\n');
    }
    
    // Create default email templates if none exist
    const templateExists = await db('email_templates').first();
    if (!templateExists) {
      await db('email_templates').insert([
        {
          template_key: 'gallery_created',
          subject: 'Your Photo Gallery is Ready!',
          body_html: `<h2>Gallery Created Successfully</h2>
<p>Dear {{host_name}},</p>
<p>Your photo gallery "{{event_name}}" has been created successfully!</p>
<p><strong>Gallery Details:</strong></p>
<ul>
  <li>Event Date: {{event_date}}</li>
  <li>Gallery Link: {{gallery_link}}</li>
  <li>Password: {{gallery_password}}</li>
  <li>Expires: {{expiry_date}}</li>
</ul>
<p>Share this link and password with your guests to allow them to view and download photos.</p>`,
          body_text: 'Gallery Created Successfully\n\nDear {{host_name}},\n\nYour photo gallery "{{event_name}}" has been created successfully!',
          variables: JSON.stringify(['host_name', 'event_name', 'event_date', 'gallery_link', 'gallery_password', 'expiry_date'])
        },
        {
          template_key: 'expiration_warning',
          subject: 'Your Photo Gallery Expires Soon',
          body_html: `<h2>Gallery Expiring Soon</h2>
<p>Dear {{host_name}},</p>
<p>Your photo gallery "{{event_name}}" will expire in {{days_remaining}} days.</p>
<p>After expiration, the gallery will be archived and no longer accessible to guests.</p>
<p><a href="{{gallery_link}}">Visit Gallery</a></p>`,
          body_text: 'Gallery Expiring Soon\n\nDear {{host_name}},\n\nYour photo gallery "{{event_name}}" will expire in {{days_remaining}} days.',
          variables: JSON.stringify(['host_name', 'event_name', 'days_remaining', 'gallery_link'])
        }
      ]);
      console.log('Default email templates created');
    }

    // Create default email config if none exists
    const emailConfig = await db('email_configs').first();
    if (!emailConfig) {
      await db('email_configs').insert({
        smtp_host: process.env.SMTP_HOST || 'mailhog',
        smtp_port: process.env.SMTP_PORT || 1025,
        smtp_secure: process.env.SMTP_SECURE === 'true',
        smtp_user: process.env.SMTP_USER || '',
        smtp_pass: process.env.SMTP_PASS || '',
        from_email: process.env.EMAIL_FROM || 'noreply@photo-sharing.local',
        from_name: 'Photo Sharing'
      });
      console.log('Default email configuration created');
    }

    console.log('Migrations completed successfully');
    process.exit(0);
  } catch (error) {
    console.error('Migration failed:', error);
    process.exit(1);
  }
}

runMigrations();