/**
 * Import Documents from Export File
 *
 * Imports curated documents into production database
 * Handles upsert (insert or update) based on slug
 *
 * Usage: node scripts/import-from-export.js <export-file.json>
 */

const { MongoClient } = require('mongodb');
const fs = require('fs').promises;

const PROD_URI = 'mongodb://localhost:27017';
const PROD_DB = 'tractatus_production';

async function run() {
  const args = process.argv.slice(2);

  if (args.length === 0) {
    console.error('Usage: node scripts/import-from-export.js <export-file.json>');
    process.exit(1);
  }

  const exportFile = args[0];

  try {
    // Read export file
    const content = await fs.readFile(exportFile, 'utf8');
    const exportData = JSON.parse(content);

    console.log('═══════════════════════════════════════════════════════════');
    console.log('  IMPORTING DOCUMENTS TO PRODUCTION');
    console.log('═══════════════════════════════════════════════════════════\n');
    console.log(`  Source: ${exportFile}`);
    console.log(`  Exported: ${exportData.exported_at}`);
    console.log(`  Documents: ${exportData.total_documents}\n`);

    const client = new MongoClient(PROD_URI);
    await client.connect();

    const db = client.db(PROD_DB);
    const collection = db.collection('documents');

    const stats = {
      inserted: 0,
      updated: 0,
      errors: []
    };

    for (const doc of exportData.documents) {
      try {
        const result = await collection.replaceOne(
          { slug: doc.slug },
          doc,
          { upsert: true }
        );

        if (result.upsertedCount > 0) {
          console.log(`  ✓ Inserted: ${doc.title}`);
          stats.inserted++;
        } else if (result.modifiedCount > 0) {
          console.log(`  ✓ Updated: ${doc.title}`);
          stats.updated++;
        } else {
          console.log(`  - No change: ${doc.title}`);
        }
      } catch (error) {
        console.error(`  ✗ Error importing ${doc.slug}: ${error.message}`);
        stats.errors.push({ slug: doc.slug, error: error.message });
      }
    }

    console.log('\n═══════════════════════════════════════════════════════════');
    console.log('  IMPORT SUMMARY');
    console.log('═══════════════════════════════════════════════════════════\n');
    console.log(`  ✅ Inserted: ${stats.inserted}`);
    console.log(`  ✅ Updated: ${stats.updated}`);
    console.log(`  ✗ Errors: ${stats.errors.length}\n`);

    if (stats.errors.length > 0) {
      console.log('  Errors:');
      stats.errors.forEach(e => console.log(`    - ${e.slug}: ${e.error}`));
      console.log('');
    }

    console.log('  Next steps:');
    console.log('  1. Verify documents in production database');
    console.log('  2. Restart production server to pick up changes');
    console.log('  3. Test https://agenticgovernance.digital/docs.html\n');

    await client.close();
    process.exit(0);
  } catch (error) {
    console.error('Import error:', error);
    process.exit(1);
  }
}

run();