import 'dart:convert';
import 'dart:io';
import 'dart:math';

import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:shelf/shelf.dart';
import 'package:shelf/shelf_io.dart';
import 'package:spotube/provider/server/pipeline.dart';
import 'package:spotube/provider/server/router.dart';
import 'package:spotube/provider/user_preferences/user_preferences_provider.dart';
import 'package:spotube/services/audio_player/audio_player.dart';
import 'package:spotube/services/logger/logger.dart';

final serverRandomSecretProvider = Provider<String>(
  (ref) {
    final random = Random.secure();
    final values = List<int>.generate(16, (i) => random.nextInt(256));
    return base64Url.encode(values);
  },
);
final serverProvider = FutureProvider(
  (ref) async {
    final randomSecret = ref.watch(serverRandomSecretProvider);
    final enabledRemoteConnect = ref.watch(
      userPreferencesProvider.select((value) => value.enableConnect),
    );
    final connectPort = ref.watch(
      userPreferencesProvider.select((value) => value.connectPort),
    );
    final pipeline = ref.watch(pipelineProvider);
    final router = ref.watch(serverRouterProvider);

    // When connect port is -1, we need to generate a random port
    // but we shouldn't reset it if it's already been set (caused by a state change)
    if (connectPort == -1) {
      if (SpotubeMedia.serverPort == 0) {
        final port = Random().nextInt(17500) + 5000;
        SpotubeMedia.serverPort = port;
      }
    } else {
      SpotubeMedia.serverPort = connectPort;
    }

    final handler = pipeline.addMiddleware(logRequests()).addMiddleware(
      (innerHandler) {
        return (request) {
          final updatedRequest = request.change(
            context: {
              'plugin_api_secret': randomSecret,
            },
          );
          return innerHandler(updatedRequest);
        };
      },
    ).addHandler(router.call);

    final server = await serve(
      handler,
      enabledRemoteConnect
          ? InternetAddress.anyIPv4
          : InternetAddress.loopbackIPv4,
      SpotubeMedia.serverPort,
    );

    AppLogger.log.t(
      'Playback server at http://${server.address.host}:${server.port}',
    );

    ref.onDispose(() {
      server.close();
    });

    return (
      server: server,
      port: SpotubeMedia.serverPort,
    );
  },
);