require('dotenv').config();
const fs = require('fs').promises;
const path = require('path');
const connectDB = require('../config/database');
const CampLocation = require('../models/campLocation');

async function validateCampLocationData(data) {
  const requiredFields = [
    'metadata',
    'hero',
    'camps',
    'locations',
    'intro',
    'faq',
    'welcomeQuote',
    'securityConcept'
  ];

  const missingFields = requiredFields.filter(field => !data[field]);
  if (missingFields.length > 0) {
    throw new Error(`Missing required fields: ${missingFields.join(', ')}`);
  }

  // Validate camps array
  if (!Array.isArray(data.camps)) {
    throw new Error('Camps must be an array');
  }
  
  // Validate each camp has required fields
  data.camps.forEach((camp, index) => {
    if (!camp.id) {
      throw new Error(`Camp at index ${index} is missing required field: id`);
    }
    if (!camp.title) {
      throw new Error(`Camp at index ${index} is missing required field: title`);
    }
  });

  // Validate locations array
  if (!Array.isArray(data.locations) || data.locations.length === 0) {
    throw new Error('Locations must be a non-empty array');
  }

  // Validate FAQ array
  if (!Array.isArray(data.faq) || data.faq.length === 0) {
    throw new Error('FAQ must be a non-empty array');
  }

  // Validate security concept items
  if (!Array.isArray(data.securityConcept.items) || data.securityConcept.items.length === 0) {
    throw new Error('Security concept items must be a non-empty array');
  }

  console.log('✓ Data validation passed');
}

/**
 * Migration: camp_location
 * Created: 13:18:38 9/12/2025
 * Imports camp location data including camps, locations, FAQ, and security information
 */
async function migrate() {
  try {
    // Kết nối database
    await connectDB();
    console.log('Starting migration: camp_location...');
    
    // Delete existing data
    const deleteResult = await CampLocation.deleteMany({});
    console.log(`✓ Deleted ${deleteResult.deletedCount} existing records`);
    
    // Read JSON file
    const campLocationData = JSON.parse(
      await fs.readFile(path.join(__dirname, '../data/camp-location.json'), 'utf8')
    );
    console.log('✓ Loaded camp-location.json');
    
    // Validate data
    await validateCampLocationData(campLocationData);
    
    // Create new record
    const result = await CampLocation.create(campLocationData);
    console.log('✓ Created camp location record');
    console.log(`  - ${result.camps.length} camps`);
    console.log(`  - ${result.locations.length} locations`);
    console.log(`  - ${result.faq.length} FAQ items`);
    console.log(`  - ${result.securityConcept.items.length} security measures`);
    
    console.log('Migration camp_location completed successfully!');
    
    const mongoose = require('mongoose');
    await mongoose.disconnect();
    process.exit(0);
  } catch (error) {
    console.error('Migration error:', error);
    process.exit(1);
  }
}

// Chạy migration nếu được gọi trực tiếp
if (require.main === module) {
  migrate();
}

module.exports = { migrate };