import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/modelos/dispositivo_audio.dart';
import 'package:pluriwave/servicios/servicio_dispositivo_audio.dart';

// Type int constants from the platform channel protocol (design doc):
// 2 = builtin_speaker, 3 = wired_headset, 8 = bt_a2dp, 14 = usb_headset

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('ServicioDispositivoAudioReal', () {
    const methodChannelName = 'pluriwave/audio_devices';

    late ServicioDispositivoAudioReal servicio;

    setUp(() {
      servicio = ServicioDispositivoAudioReal();
    });

    tearDown(() async {
      await servicio.dispose();
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(
            const MethodChannel(methodChannelName),
            null,
          );
    });

    void stubGetActiveDevice(Map<String, dynamic> response) {
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(const MethodChannel(methodChannelName), (
            call,
          ) async {
            if (call.method == 'getActiveDevice') return response;
            return null;
          });
    }

    void stubRequestBluetoothConnect(bool? response) {
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(const MethodChannel(methodChannelName), (
            call,
          ) async {
            if (call.method == 'requestBluetoothConnect') return response;
            return null;
          });
    }

    test('obtenerDispositivoActual maps builtin_speaker (type=2)', () async {
      stubGetActiveDevice({
        'id': 'builtin_speaker',
        'type': 2,
        'name': 'Speaker',
      });
      final device = await servicio.obtenerDispositivoActual();
      expect(device.id, 'builtin_speaker');
      expect(device.tipo, TipoDispositivo.altavozInterno);
      expect(device.nombre, 'Speaker');
    });

    test('obtenerDispositivoActual maps wired_headset (type=3)', () async {
      stubGetActiveDevice({
        'id': 'wired_headset',
        'type': 3,
        'name': 'Wired Headset',
      });
      final device = await servicio.obtenerDispositivoActual();
      expect(device.id, 'wired_headset');
      expect(device.tipo, TipoDispositivo.auricularesCable);
    });

    test('obtenerDispositivoActual maps bt_a2dp (type=8)', () async {
      stubGetActiveDevice({
        'id': 'bt_a2dp:AA:BB:CC:DD:EE:FF',
        'type': 8,
        'name': 'My BT Device',
      });
      final device = await servicio.obtenerDispositivoActual();
      expect(device.id, 'bt_a2dp:AA:BB:CC:DD:EE:FF');
      expect(device.tipo, TipoDispositivo.bluetoothA2dp);
    });

    test('obtenerDispositivoActual maps usb_headset (type=14)', () async {
      stubGetActiveDevice({
        'id': 'usb_headset:0001:0002',
        'type': 14,
        'name': 'USB Headset',
      });
      final device = await servicio.obtenerDispositivoActual();
      expect(device.id, 'usb_headset:0001:0002');
      expect(device.tipo, TipoDispositivo.usbAudio);
    });

    test('obtenerDispositivoActual maps unknown type to desconocido', () async {
      stubGetActiveDevice({
        'id': 'unknown_device',
        'type': 99,
        'name': 'Unknown',
      });
      final device = await servicio.obtenerDispositivoActual();
      expect(device.tipo, TipoDispositivo.desconocido);
    });

    test('obtenerDispositivoActual updates dispositivoActual cache', () async {
      stubGetActiveDevice({
        'id': 'builtin_speaker',
        'type': 2,
        'name': 'Speaker',
      });
      await servicio.obtenerDispositivoActual();
      expect(servicio.dispositivoActual?.id, 'builtin_speaker');
    });

    test('onDispositivoCambiado is a broadcast stream', () {
      expect(servicio.onDispositivoCambiado.isBroadcast, isTrue);
    });

    // ── bt-device-identity Phase 2: permission contract ──────────────────────

    test(
      'solicitarPermisoBluetooth invokes requestBluetoothConnect and '
      'returns true when granted',
      () async {
        stubRequestBluetoothConnect(true);
        final granted = await servicio.solicitarPermisoBluetooth();
        expect(granted, isTrue);
      },
    );

    test(
      'solicitarPermisoBluetooth returns false when the platform denies',
      () async {
        stubRequestBluetoothConnect(false);
        final granted = await servicio.solicitarPermisoBluetooth();
        expect(granted, isFalse);
      },
    );

    test(
      'solicitarPermisoBluetooth returns false when the platform channel '
      'returns null',
      () async {
        stubRequestBluetoothConnect(null);
        final granted = await servicio.solicitarPermisoBluetooth();
        expect(granted, isFalse);
      },
    );

    // ── Fix: robust active-device detection (stale green dot) ────────────────

    test(
      'resubscribir sends cancel+listen to the event channel and forwards '
      'the device the fresh onListen emits',
      () async {
        var listens = 0;
        var cancels = 0;
        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
            .setMockStreamHandler(
              const EventChannel(methodChannelName),
              MockStreamHandler.inline(
                onListen: (arguments, events) {
                  listens++;
                  // Mirrors the native onListen immediate resync: every
                  // (re)subscription receives the current active device.
                  events.success({
                    'id': 'bt_a2dp:AA:BB:CC:DD:EE:FF',
                    'type': 8,
                    'name': 'My BT Device',
                  });
                },
                onCancel: (arguments) => cancels++,
              ),
            );
        addTearDown(() {
          TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
              .setMockStreamHandler(
                const EventChannel(methodChannelName),
                null,
              );
        });

        final servicioLocal = ServicioDispositivoAudioReal();
        addTearDown(servicioLocal.dispose);

        // The constructor's initial subscription delivers the first resync.
        final primero = await servicioLocal.onDispositivoCambiado.first;
        expect(primero.id, 'bt_a2dp:AA:BB:CC:DD:EE:FF');
        expect(listens, 1);
        expect(cancels, 0);

        final segundoFuturo = servicioLocal.onDispositivoCambiado.first;
        await servicioLocal.resubscribir();
        final segundo = await segundoFuturo;

        expect(cancels, 1);
        expect(listens, 2);
        expect(segundo.tipo, TipoDispositivo.bluetoothA2dp);
        expect(
          servicioLocal.dispositivoActual?.id,
          'bt_a2dp:AA:BB:CC:DD:EE:FF',
        );
      },
    );
  });
}