import { S3Client, ListBucketsCommand, CreateBucketCommand, HeadBucketCommand } from '@aws-sdk/client-s3';
import fs from 'fs/promises';
import path from 'path';

// Load S3 configuration from s3-config.json
async function loadS3Config() {
  try {
    const configPath = path.join(process.cwd(), 's3-config.json');
    const configData = await fs.readFile(configPath, 'utf-8');
    return JSON.parse(configData);
  } catch (error) {
    console.warn('Failed to load s3-config.json, using default MinIO configuration');
    return {
      endpoint: 'http://localhost:9000',
      region: 'us-east-1',
      accessKeyId: 'minioadmin',
      secretAccessKey: 'minioadmin',
      bucketName: 'music-files',
      useSSL: false,
    };
  }
}

// Test S3 service configuration
let s3Client;
let bucketName;

async function initializeS3Client() {
  const config = await loadS3Config();
  
  s3Client = new S3Client({
    endpoint: config.endpoint,
    region: config.region,
    credentials: {
      accessKeyId: config.accessKeyId,
      secretAccessKey: config.secretAccessKey,
    },
    forcePathStyle: true,
  });
  
  bucketName = config.bucketName;
  
  console.log(`🔧 Using S3 configuration:`);
  console.log(`   Endpoint: ${config.endpoint}`);
  console.log(`   Region: ${config.region}`);
  console.log(`   Bucket: ${config.bucketName}`);
  console.log(`   UseSSL: ${config.useSSL}`);
}

async function testS3Connection() {
  try {
    // Initialize S3 client with configuration from file
    await initializeS3Client();
    
    console.log('🧪 Testing S3/MinIO connection...');
    
    // Test connection by listing buckets
    const buckets = await s3Client.send(new ListBucketsCommand({}));
    console.log('✅ S3 connection successful');
    console.log('   Available buckets:', buckets.Buckets?.map(b => b.Name).join(', ') || 'none');
    
    // Test if our bucket exists
    try {
      await s3Client.send(new HeadBucketCommand({ Bucket: bucketName }));
      console.log(`✅ Bucket '${bucketName}' exists`);
    } catch (error) {
      if (error.name === 'NotFound') {
        console.log(`⚠️  Bucket '${bucketName}' doesn't exist, creating...`);
        await s3Client.send(new CreateBucketCommand({ Bucket: bucketName }));
        console.log(`✅ Bucket '${bucketName}' created successfully`);
      } else {
        throw error;
      }
    }
    
    // Test audio file validation (simple regex test)
    const audioExtensions = ['.mp3', '.wav', '.flac', '.m4a', '.aac'];
    const testFiles = ['song.mp3', 'track.wav', 'music.flac', 'test.txt'];
    
    console.log('\n🎵 Testing audio file validation:');
    testFiles.forEach(file => {
      const extension = file.toLowerCase().substring(file.lastIndexOf('.'));
      const isValidAudio = audioExtensions.includes(extension);
      console.log(`   ${isValidAudio ? '✅' : '❌'} ${file}: ${isValidAudio ? 'Valid audio' : 'Not audio'}`);
    });
    
    // Test file size formatting
    const formatFileSize = (bytes) => {
      if (bytes === 0) return '0 Bytes';
      const k = 1024;
      const sizes = ['Bytes', 'KB', 'MB', 'GB'];
      const i = Math.floor(Math.log(bytes) / Math.log(k));
      return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
    };
    
    console.log('\n📏 Testing file size formatting:');
    const testSizes = [1024, 5242880, 1073741824];
    testSizes.forEach(size => {
      console.log(`   ${formatFileSize(size)} (${size} bytes)`);
    });
    
    // Test duration formatting
    const formatDuration = (seconds) => {
      const minutes = Math.floor(seconds / 60);
      const remainingSeconds = Math.floor(seconds % 60);
      return `${minutes}:${remainingSeconds.toString().padStart(2, '0')}`;
    };
    
    console.log('\n⏱️  Testing duration formatting:');
    const testDurations = [61, 125.5, 3600];
    testDurations.forEach(duration => {
      console.log(`   ${formatDuration(duration)} (${duration} seconds)`);
    });
    
    console.log('\n🎉 All tests passed! S3 storage is ready to use.');
    console.log('\n📋 Next steps:');
    console.log('   1. Start backend: npm run dev');
    console.log('   2. Start frontend: cd ../frontend && npm run dev');
    console.log('   3. Open browser: http://localhost:5173');
    
  } catch (error) {
    console.error('❌ Test failed:', error.message);
    console.log('\n💡 Troubleshooting:');
    console.log('   1. Make sure MinIO is running:');
    console.log('      docker-compose -f docker-compose.dev.yml up -d');
    console.log('   2. Check MinIO logs:');
    console.log('      docker logs minio');
    console.log('   3. Verify MinIO is accessible at: http://localhost:9000');
  }
}

testS3Connection();