#!/usr/bin/env node

/**
 * Export Translations Script
 *
 * Exports all translations from the local database to a JSON file
 * for deployment to production without re-running DeepL API
 *
 * Usage:
 *   node scripts/export-translations.js [output-file]
 *
 * Default output: /tmp/translations-export.json
 */

require('dotenv').config();
const mongoose = require('mongoose');
const fs = require('fs');
const path = require('path');

const Document = require('../src/models/Document.model');

async function main() {
  const outputFile = process.argv[2] || '/tmp/translations-export.json';

  console.log('═══════════════════════════════════════════════════════════');
  console.log('  EXPORT TRANSLATIONS');
  console.log('═══════════════════════════════════════════════════════════\n');

  // Connect to MongoDB
  console.log('📡 Connecting to MongoDB...');
  await mongoose.connect(process.env.MONGODB_URI || 'mongodb://localhost:27017/tractatus_dev', {
    serverSelectionTimeoutMS: 5000
  });
  console.log('✓ Connected\n');

  // Fetch all documents with translations
  console.log('📚 Fetching documents with translations...');
  const documents = await Document.list({
    filter: { visibility: 'public' },
    limit: 1000,
    sort: { order: 1 }
  });

  const exportData = {
    exported_at: new Date().toISOString(),
    source_database: process.env.MONGODB_URI || 'mongodb://localhost:27017/tractatus_dev',
    total_documents: documents.length,
    documents: []
  };

  let totalTranslations = 0;

  for (const doc of documents) {
    if (doc.translations && Object.keys(doc.translations).length > 0) {
      const docExport = {
        slug: doc.slug,
        _id: doc._id.toString(),
        translations: doc.translations
      };

      exportData.documents.push(docExport);

      const langCount = Object.keys(doc.translations).length;
      totalTranslations += langCount;
      console.log(`  ✓ ${doc.slug}: ${langCount} translation(s)`);
    }
  }

  exportData.total_translations = totalTranslations;

  // Write to file
  console.log(`\n💾 Writing to ${outputFile}...`);
  fs.writeFileSync(outputFile, JSON.stringify(exportData, null, 2), 'utf8');
  console.log('✓ Export complete\n');

  // Summary
  console.log('═══════════════════════════════════════════════════════════');
  console.log('  EXPORT SUMMARY');
  console.log('═══════════════════════════════════════════════════════════\n');
  console.log(`  Documents with translations: ${exportData.documents.length}`);
  console.log(`  Total translations: ${totalTranslations}`);
  console.log(`  Output file: ${outputFile}`);
  console.log(`  File size: ${(fs.statSync(outputFile).size / 1024).toFixed(2)} KB\n`);

  await mongoose.disconnect();
  console.log('✓ Database disconnected\n');

  process.exit(0);
}

// Run
main().catch(err => {
  console.error('\n❌ Fatal error:', err.message);
  console.error(err.stack);
  process.exit(1);
});