import 'dart:io';
import 'dart:async';
import 'package:args/args.dart';
import 'package:logging/logging.dart';
import 'package:mumbullet/mumbullet.dart';
import 'package:mumbullet/src/dashboard/server.dart';
import 'package:path/path.dart' as path;

Future<void> main(List<String> arguments) async {
  // Parse command line arguments
  final parser =
      ArgParser()
        ..addOption('config', abbr: 'c', defaultsTo: 'config.json', help: 'Path to configuration file')
        ..addOption(
          'log-level',
          abbr: 'l',
          defaultsTo: 'info',
          allowed: ['debug', 'info', 'warning', 'error'],
          help: 'Log level (debug, info, warning, error)',
        )
        ..addFlag('console-log', abbr: 'o', defaultsTo: true, help: 'Log to console')
        ..addOption('log-file', abbr: 'f', help: 'Path to log file')
        ..addFlag('help', abbr: 'h', negatable: false, help: 'Display this help message');

  try {
    final results = parser.parse(arguments);

    if (results['help'] == true) {
      print('Mumble Music Bot - A Dart-based music bot for Mumble servers');
      print('');
      print('Usage:');
      print('dart bin/mumbullet.dart [options]');
      print('');
      print('Options:');
      print(parser.usage);
      exit(0);
    }

    // Set up logging
    final logLevelString = results['log-level'] as String;
    final Level logLevel = _parseLogLevel(logLevelString);
    final logManager = LogManager.getInstance();

    logManager.initialize(
      level: logLevel,
      logToConsole: results['console-log'] as bool,
      logFilePath: results['log-file'] as String?,
    );

    // Load configuration
    final configPath = results['config'] as String;
    final logger = logManager.logger;

    logger.info('Starting Mumble Music Bot');
    logger.info('Loading configuration from $configPath');

    final config = AppConfig.fromFile(configPath);
    try {
      config.validate();
      logger.info('Configuration loaded successfully');
    } catch (e) {
      logger.severe('Configuration validation error: $e');
      exit(1);
    }

    // Initialize database
    final dbPath = path.join(config.bot.cacheDirectory, 'mumbullet.db');
    logger.info('Initializing database: $dbPath');
    final database = DatabaseManager(dbPath);

    // Initialize permission manager
    final permissionManager = PermissionManager(database, config.bot);

    // Create Mumble connection
    logger.info('Connecting to Mumble server ${config.mumble.server}:${config.mumble.port}');
    final mumbleConnection = MumbleConnection(config.mumble);

    // Create message handler
    final messageHandler = MumbleMessageHandler(mumbleConnection, config.bot);

    // Initialize audio services
    logger.info('Initializing audio services');
    final audioConverter = AudioConverter();
    final youtubeDownloader = YoutubeDownloader(config.bot, database);
    final audioStreamer = MumbleAudioStreamer(mumbleConnection);

    // Create music queue
    final musicQueue = MusicQueue(config.bot, audioStreamer, audioConverter);

    // Create command parser with permission callback
    final commandParser = CommandParser(
      messageHandler,
      config.bot,
      (user) => permissionManager.getPermissionLevel(user),
    );

    // Create command handler with connection for private messaging
    final commandHandler = CommandHandler(
      commandParser,
      musicQueue,
      youtubeDownloader,
      config.bot,
      mumbleConnection,
    );

    final dashboardServer = DashboardServer(config.dashboard, musicQueue, youtubeDownloader, permissionManager);

    dashboardServer.start();

    // Set up event listeners
    mumbleConnection.connectionState.listen((isConnected) {
      if (isConnected) {
        logger.info('Connected to Mumble server');
      } else {
        logger.info('Disconnected from Mumble server');
      }
    });

    mumbleConnection.userJoined.listen((user) {
      logger.info('User joined: ${user.name}');
    });

    mumbleConnection.userLeft.listen((user) {
      logger.info('User left: ${user.name}');
    });

    // Listen to music queue events
    musicQueue.events.listen((event) {
      final eventType = event['event'] as String;
      final data = event['data'] as Map<String, dynamic>;

      logger.info('Music queue event: $eventType');

      // Log important events
      switch (eventType) {
        case 'songStarted':
          final song = data['song'] as Song;
          logger.info('Now playing: ${song.title}');
          break;
        case 'songFinished':
          final song = data['song'] as Song;
          logger.info('Finished playing: ${song.title}');
          break;
        case 'queueEmpty':
          logger.info('Music queue is now empty');
          break;
      }
    });

    // Connect to Mumble server
    try {
      await mumbleConnection.connect();

      // Send a welcome message to the channel
      if (mumbleConnection.isConnected) {
        await mumbleConnection.sendChannelMessage(
          'MumBullet Music Bot is online! Type ${config.bot.commandPrefix}help for a list of commands.',
        );
        logger.info('Sent welcome message to channel');
      }
    } catch (e) {
      logger.warning('Failed to connect to Mumble server: $e');
      logger.info('The bot will automatically attempt to reconnect...');
    }

    logger.info('MumBullet is now running with the following features:');
    logger.info('- Mumble server connection');
    logger.info('- Command processing with permissions');
    logger.info('- YouTube audio downloading and streaming');
    logger.info('- Queue management');
    logger.info('- Admin dashboard');

    logger.info('Press Ctrl+C to exit');

    // Wait for shutdown
    final completer = Completer<void>();

    // Set up signal handlers
    ProcessSignal.sigint.watch().listen((_) async {
      logger.info('Shutting down Mumble Music Bot');

      // Stop music playback
      try {
        await audioStreamer.stopStreaming();
        musicQueue.dispose();
      } catch (e) {
        logger.warning('Error stopping audio services: $e');
      }

      // Disconnect from Mumble server
      if (mumbleConnection.isConnected) {
        try {
          await mumbleConnection.sendChannelMessage('MumBullet Music Bot is shutting down...');
          await mumbleConnection.disconnect();
        } catch (e) {
          logger.warning('Error during shutdown: $e');
        }
      }

      // Dispose resources
      mumbleConnection.dispose();
      messageHandler.dispose();
      database.close();
      await dashboardServer.stop();

      completer.complete();
    });

    ProcessSignal.sigterm.watch().listen((_) async {
      logger.info('Shutting down Mumble Music Bot');

      // Stop music playback
      try {
        await audioStreamer.stopStreaming();
        musicQueue.dispose();
      } catch (e) {
        logger.warning('Error stopping audio services: $e');
      }

      // Disconnect from Mumble server
      if (mumbleConnection.isConnected) {
        try {
          await mumbleConnection.sendChannelMessage('MumBullet Music Bot is shutting down...');
          await mumbleConnection.disconnect();
        } catch (e) {
          logger.warning('Error during shutdown: $e');
        }
      }

      // Dispose resources
      mumbleConnection.dispose();
      messageHandler.dispose();
      database.close();
      await dashboardServer.stop();

      completer.complete();
    });

    await completer.future;

    // Close logger
    logManager.close();
    exit(0);
  } catch (e, stackTrace) {
    print('Error: $e');
    print('Stack trace: $stackTrace');
    print('');
    print('Usage:');
    print(parser.usage);
    exit(1);
  }
}

Level _parseLogLevel(String level) {
  switch (level.toLowerCase()) {
    case 'debug':
      return Level.FINE;
    case 'info':
      return Level.INFO;
    case 'warning':
      return Level.WARNING;
    case 'error':
      return Level.SEVERE;
    default:
      return Level.INFO;
  }
}