#!/usr/bin/env node

/**
 * Translation Verification Script
 *
 * Verifies that all documents have been translated correctly:
 * - Checks which documents have German (de) translations
 * - Checks which documents have French (fr) translations
 * - Reports translation completeness and metadata
 */

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

async function main() {
  console.log('═══════════════════════════════════════════════════════════');
  console.log('  TRANSLATION VERIFICATION');
  console.log('═══════════════════════════════════════════════════════════\n');

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

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

  console.log(`📚 Analyzing ${documents.length} public documents...\n`);

  const stats = {
    total: documents.length,
    withDE: 0,
    withFR: 0,
    withBoth: 0,
    withNone: 0,
    details: []
  };

  // Check each document
  for (const doc of documents) {
    const hasDE = doc.translations && doc.translations.de && doc.translations.de.title;
    const hasFR = doc.translations && doc.translations.fr && doc.translations.fr.title;

    if (hasDE) stats.withDE++;
    if (hasFR) stats.withFR++;
    if (hasDE && hasFR) stats.withBoth++;
    if (!hasDE && !hasFR) stats.withNone++;

    stats.details.push({
      slug: doc.slug,
      title: doc.title,
      de: hasDE,
      fr: hasFR,
      de_title: hasDE ? doc.translations.de.title : null,
      fr_title: hasFR ? doc.translations.fr.title : null,
      de_chars: hasDE ? doc.translations.de.content_markdown?.length || 0 : 0,
      fr_chars: hasFR ? doc.translations.fr.content_markdown?.length || 0 : 0,
      de_metadata: hasDE ? doc.translations.de.metadata : null,
      fr_metadata: hasFR ? doc.translations.fr.metadata : null
    });
  }

  // Display summary
  console.log('═══════════════════════════════════════════════════════════');
  console.log('  SUMMARY');
  console.log('═══════════════════════════════════════════════════════════\n');

  console.log(`  Total documents: ${stats.total}`);
  console.log(`  With German (DE): ${stats.withDE} (${(stats.withDE / stats.total * 100).toFixed(1)}%)`);
  console.log(`  With French (FR): ${stats.withFR} (${(stats.withFR / stats.total * 100).toFixed(1)}%)`);
  console.log(`  With both languages: ${stats.withBoth} (${(stats.withBoth / stats.total * 100).toFixed(1)}%)`);
  console.log(`  With no translations: ${stats.withNone}\n`);

  // Display details
  console.log('═══════════════════════════════════════════════════════════');
  console.log('  DOCUMENT DETAILS');
  console.log('═══════════════════════════════════════════════════════════\n');

  stats.details.forEach((detail, index) => {
    const deStatus = detail.de ? '✓' : '✗';
    const frStatus = detail.fr ? '✓' : '✗';

    console.log(`${index + 1}. ${detail.title}`);
    console.log(`   Slug: ${detail.slug}`);
    console.log(`   DE: ${deStatus} ${detail.de ? `(${detail.de_chars.toLocaleString()} chars)` : ''}`);
    if (detail.de) {
      console.log(`       Title: "${detail.de_title}"`);
      console.log(`       Translated: ${detail.de_metadata?.translated_at || 'unknown'}`);
    }
    console.log(`   FR: ${frStatus} ${detail.fr ? `(${detail.fr_chars.toLocaleString()} chars)` : ''}`);
    if (detail.fr) {
      console.log(`       Title: "${detail.fr_title}"`);
      console.log(`       Translated: ${detail.fr_metadata?.translated_at || 'unknown'}`);
    }
    console.log('');
  });

  // Missing translations
  const missing = stats.details.filter(d => !d.de || !d.fr);
  if (missing.length > 0) {
    console.log('═══════════════════════════════════════════════════════════');
    console.log('  MISSING TRANSLATIONS');
    console.log('═══════════════════════════════════════════════════════════\n');

    missing.forEach(doc => {
      const missingLangs = [];
      if (!doc.de) missingLangs.push('DE');
      if (!doc.fr) missingLangs.push('FR');
      console.log(`  ${doc.slug}: Missing ${missingLangs.join(', ')}`);
    });
    console.log('');
  }

  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);
});