/**
 * Script to sync database with MinIO
 *
 * Removes document references from database for files that no longer exist in MinIO
 */

const { S3Client, ListObjectsV2Command, HeadObjectCommand } = require('@aws-sdk/client-s3');
const { Client } = require('pg');
require('dotenv').config();

const MINIO_ENDPOINT = process.env.AWS_S3_ENDPOINT || 'http://localhost:9000';
const BUCKET_NAME = 'xpeditis-documents';

// Initialize MinIO client
const s3Client = new S3Client({
  region: 'us-east-1',
  endpoint: MINIO_ENDPOINT,
  credentials: {
    accessKeyId: process.env.AWS_ACCESS_KEY_ID || 'minioadmin',
    secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY || 'minioadmin',
  },
  forcePathStyle: true,
});

async function syncDatabase() {
  const pgClient = new Client({
    host: process.env.DATABASE_HOST || 'localhost',
    port: process.env.DATABASE_PORT || 5432,
    user: process.env.DATABASE_USER || 'xpeditis',
    password: process.env.DATABASE_PASSWORD || 'xpeditis_dev_password',
    database: process.env.DATABASE_NAME || 'xpeditis_dev',
  });

  try {
    await pgClient.connect();
    console.log('✅ Connected to database\n');

    // Get all MinIO files
    console.log('📋 Listing files in MinIO...');
    let allMinioFiles = [];
    let continuationToken = null;

    do {
      const command = new ListObjectsV2Command({
        Bucket: BUCKET_NAME,
        ContinuationToken: continuationToken,
      });

      const response = await s3Client.send(command);

      if (response.Contents) {
        allMinioFiles = allMinioFiles.concat(response.Contents.map(f => f.Key));
      }

      continuationToken = response.NextContinuationToken;
    } while (continuationToken);

    console.log(`   Found ${allMinioFiles.length} files in MinIO\n`);

    // Create a set for faster lookup
    const minioFilesSet = new Set(allMinioFiles);

    // Get all bookings with documents
    const result = await pgClient.query(
      `SELECT id, documents FROM csv_bookings WHERE documents IS NOT NULL AND jsonb_array_length(documents::jsonb) > 0`
    );

    console.log(`📄 Found ${result.rows.length} bookings with documents in database\n`);

    let updatedCount = 0;
    let removedDocsCount = 0;
    let emptyBookingsCount = 0;

    for (const row of result.rows) {
      const bookingId = row.id;
      const documents = row.documents;

      // Filter documents to keep only those that exist in MinIO
      const validDocuments = [];
      const missingDocuments = [];

      for (const doc of documents) {
        if (!doc.filePath) {
          missingDocuments.push(doc);
          continue;
        }

        // Extract the S3 key from the URL
        try {
          const url = new URL(doc.filePath);
          const pathname = url.pathname;
          // Remove leading slash and bucket name
          const key = pathname.substring(1).replace(`${BUCKET_NAME}/`, '');

          if (minioFilesSet.has(key)) {
            validDocuments.push(doc);
          } else {
            missingDocuments.push(doc);
          }
        } catch (error) {
          console.error(`   ⚠️  Invalid URL for booking ${bookingId}: ${doc.filePath}`);
          missingDocuments.push(doc);
        }
      }

      if (missingDocuments.length > 0) {
        console.log(`\n📦 Booking: ${bookingId.substring(0, 8)}...`);
        console.log(`   Total documents: ${documents.length}`);
        console.log(`   Valid documents: ${validDocuments.length}`);
        console.log(`   Missing documents: ${missingDocuments.length}`);

        missingDocuments.forEach(doc => {
          console.log(`      ❌ ${doc.fileName || 'Unknown'}`);
        });

        // Update the database
        await pgClient.query(
          `UPDATE csv_bookings SET documents = $1 WHERE id = $2`,
          [JSON.stringify(validDocuments), bookingId]
        );

        updatedCount++;
        removedDocsCount += missingDocuments.length;

        if (validDocuments.length === 0) {
          emptyBookingsCount++;
          console.log(`   ⚠️  This booking now has NO documents`);
        }
      }
    }

    console.log(`\n📊 Summary:`);
    console.log(`   Bookings updated: ${updatedCount}`);
    console.log(`   Documents removed from DB: ${removedDocsCount}`);
    console.log(`   Bookings with no documents: ${emptyBookingsCount}`);
    console.log(`\n✅ Database synchronized with MinIO`);
  } catch (error) {
    console.error('❌ Error:', error);
    throw error;
  } finally {
    await pgClient.end();
    console.log('\n👋 Disconnected from database');
  }
}

syncDatabase()
  .then(() => {
    console.log('\n✅ Script completed successfully');
    process.exit(0);
  })
  .catch((error) => {
    console.error('\n❌ Script failed:', error);
    process.exit(1);
  });