import 'dart:io';
import 'package:test/test.dart';
import 'package:path/path.dart' as path;
import 'package:mumbullet/src/audio/downloader.dart';
import 'package:mumbullet/src/config/config.dart';
import 'package:mumbullet/src/storage/database.dart';

void main() {
  group('YoutubeDownloader Simple Integration Tests', () {
    late YoutubeDownloader downloader;
    late DatabaseManager database;
    late BotConfig config;
    late Directory tempDir;
    late String tempDbPath;

    setUpAll(() async {
      // Check if yt-dlp is available
      try {
        final result = await Process.run('yt-dlp', ['--version']);
        if (result.exitCode != 0) {
          throw Exception('yt-dlp not available');
        }
      } catch (e) {
        print('Skipping yt-dlp tests: yt-dlp not found in PATH');
        return;
      }
    });

    setUp(() async {
      // Create temporary directory for cache
      tempDir = await Directory.systemTemp.createTemp('mumbullet_test_');
      
      // Create temporary database
      tempDbPath = path.join(tempDir.path, 'test.db');
      
      // Create test configuration
      config = BotConfig(
        commandPrefix: '!',
        defaultPermissionLevel: 1,
        maxQueueSize: 10,
        cacheDirectory: tempDir.path,
        maxCacheSizeGb: 0.1, // 100MB for testing
      );
      
      // Initialize database
      database = DatabaseManager(tempDbPath);
      
      // Create downloader
      downloader = YoutubeDownloader(config, database);
    });

    tearDown(() async {
      // Clean up
      try {
        database.close();
      } catch (e) {
        // Ignore close errors
      }
      if (tempDir.existsSync()) {
        await tempDir.delete(recursive: true);
      }
    });

    group('Basic Functionality', () {
      test('should download a valid YouTube video and return Song object', () async {
        const testUrl = 'https://www.youtube.com/watch?v=jNQXAC9IVRw'; // "Me at the zoo"
        
        final song = await downloader.download(testUrl);
        
        // Verify basic song properties
        expect(song.url, equals(testUrl));
        expect(song.title, isNotEmpty);
        expect(song.title, isNot(equals('Unknown Title')));
        expect(song.duration, greaterThan(0));
        expect(song.filePath, isNotEmpty);
        expect(song.id, greaterThan(0));
        expect(song.addedAt, isNotNull);
        
        // Verify file path structure
        expect(song.filePath, startsWith(tempDir.path));
        expect(song.filePath, endsWith('.wav'));
        
        print('Downloaded: ${song.title} (${song.duration}s) -> ${song.filePath}');
      }, timeout: Timeout(Duration(minutes: 2)));

      test('should use cache on second download', () async {
        const testUrl = 'https://www.youtube.com/watch?v=jNQXAC9IVRw';
        
        // First download
        final song1 = await downloader.download(testUrl);
        
        // Second download (should use cache)
        final song2 = await downloader.download(testUrl);
        
        // Should return same song from cache
        expect(song1.id, equals(song2.id));
        expect(song1.title, equals(song2.title));
        expect(song1.filePath, equals(song2.filePath));
        
        print('Cache test passed: ${song1.title}');
      }, timeout: Timeout(Duration(minutes: 3)));

      test('should handle invalid URLs gracefully', () async {
        final invalidUrls = [
          'not-a-url',
          'https://invalid-domain.com/video',
          'https://www.youtube.com/watch?v=InvalidVideoId123',
        ];
        
        for (final url in invalidUrls) {
          try {
            await downloader.download(url);
            fail('Should have thrown exception for invalid URL: $url');
          } catch (e) {
            expect(e, isA<Exception>());
            print('Correctly handled invalid URL: $url - ${e.toString()}');
          }
        }
      });

      test('should provide cache statistics', () async {
        // Initially empty
        final initialStats = await downloader.getCacheStats();
        expect(initialStats['songCount'], equals(0));
        
        // Download a video
        const testUrl = 'https://www.youtube.com/watch?v=jNQXAC9IVRw';
        await downloader.download(testUrl);
        
        // Check updated stats
        final updatedStats = await downloader.getCacheStats();
        expect(updatedStats['songCount'], equals(1));
        expect(updatedStats['totalSizeBytes'], greaterThan(0));
        
        print('Cache stats: ${updatedStats['songCount']} songs, ${updatedStats['totalSizeMb']} MB');
      }, timeout: Timeout(Duration(minutes: 2)));

      test('should clear cache', () async {
        // Download a video
        const testUrl = 'https://www.youtube.com/watch?v=jNQXAC9IVRw';
        await downloader.download(testUrl);
        
        // Verify cache has content
        final statsBefore = await downloader.getCacheStats();
        expect(statsBefore['songCount'], greaterThan(0));
        
        // Clear cache
        await downloader.clearCache();
        
        // Verify cache is empty
        final statsAfter = await downloader.getCacheStats();
        expect(statsAfter['songCount'], equals(0));
        expect(statsAfter['totalSizeBytes'], equals(0));
        
        print('Cache cleared successfully');
      }, timeout: Timeout(Duration(minutes: 2)));
    });

    group('URL Format Variations', () {
      test('should handle different YouTube URL formats', () async {
        final testUrls = [
          'https://www.youtube.com/watch?v=jNQXAC9IVRw',
          'https://youtu.be/jNQXAC9IVRw',
        ];
        
        String? firstTitle;
        
        for (final url in testUrls) {
          final song = await downloader.download(url);
          
          expect(song.title, isNotEmpty);
          expect(song.duration, greaterThan(0));
          
          if (firstTitle == null) {
            firstTitle = song.title;
          } else {
            // All URLs should resolve to the same video
            expect(song.title, equals(firstTitle));
          }
          
          print('URL format test: $url -> ${song.title}');
        }
      }, timeout: Timeout(Duration(minutes: 3)));
    });

    group('Edge Cases', () {
      test('should handle re-download when cached file is missing', () async {
        const testUrl = 'https://www.youtube.com/watch?v=jNQXAC9IVRw';
        
        // Download a video
        final song1 = await downloader.download(testUrl);
        final originalPath = song1.filePath;
        
        // Manually delete the file (simulating external deletion)
        if (File(originalPath).existsSync()) {
          await File(originalPath).delete();
        }
        
        // Try to download again - should re-download
        final song2 = await downloader.download(testUrl);
        
        // Should have same title but may have different file path
        expect(song2.title, equals(song1.title));
        expect(song2.filePath, isNotEmpty);
        
        print('Re-download test passed: ${song2.title}');
      }, timeout: Timeout(Duration(minutes: 3)));
    });
  }, skip: Platform.environment['SKIP_INTEGRATION_TESTS'] == 'true');
}