import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pluriwave/servicios/servicio_audio.dart';
import 'package:pluriwave/widgets/visualizador_audio.dart';

/// Play sensitive-permission guard for the waveform visualizer.
///
/// `MainActivity.startVisualizerWhenAllowed` asks for `RECORD_AUDIO` the
/// instant Dart subscribes to the `pluriwave/audio_visualizer` EventChannel.
/// The home screen's "Escuchar" hero mounts this widget, so before this the
/// microphone dialog appeared on the user's FIRST play, with no context at
/// all, in a radio app — the worst possible moment to ask.
///
/// The subscription (and therefore the permission request) is now gated on
/// an explicit opt-in the user gives in Settings, after reading what the
/// permission is for. These tests pin the Dart half of that: no opt-in, no
/// channel subscription.
void main() {
  const canal = MethodChannel('pluriwave/audio_visualizer');

  late List<MethodCall> llamadas;

  setUp(() {
    llamadas = <MethodCall>[];
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(canal, (call) async {
          llamadas.add(call);
          return null;
        });
  });

  tearDown(() {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(canal, null);
  });

  Future<void> montar(
    WidgetTester tester, {
    required Stream<EstadoReproduccion> estadoStream,
    required Stream<int?> sessionStream,
    required bool capturaRealHabilitada,
  }) async {
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: VisualizadorAudio(
            estadoStream: estadoStream,
            androidAudioSessionIdStream: sessionStream,
            barras: 12,
            capturaRealHabilitada: capturaRealHabilitada,
          ),
        ),
      ),
    );
    await tester.pump();
  }

  testWidgets(
    'sin el opt-in, reproducir NO suscribe el EventChannel (y por tanto no '
    'dispara la peticion de RECORD_AUDIO)',
    (tester) async {
      final estado = StreamController<EstadoReproduccion>.broadcast();
      final sesion = StreamController<int?>.broadcast();
      addTearDown(estado.close);
      addTearDown(sesion.close);

      await montar(
        tester,
        estadoStream: estado.stream,
        sessionStream: sesion.stream,
        capturaRealHabilitada: false,
      );

      sesion.add(42);
      estado.add(EstadoReproduccion.reproduciendo);
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));

      expect(
        llamadas.where((c) => c.method == 'listen'),
        isEmpty,
        reason:
            'subscribing is what makes MainActivity call requestPermissions '
            'for RECORD_AUDIO; with no opt-in it must never happen',
      );
    },
  );

  testWidgets(
    'con el opt-in, reproducir SI suscribe el EventChannel (la onda real '
    'sigue disponible para quien la pide)',
    (tester) async {
      final estado = StreamController<EstadoReproduccion>.broadcast();
      final sesion = StreamController<int?>.broadcast();
      addTearDown(estado.close);
      addTearDown(sesion.close);

      await montar(
        tester,
        estadoStream: estado.stream,
        sessionStream: sesion.stream,
        capturaRealHabilitada: true,
      );

      sesion.add(42);
      estado.add(EstadoReproduccion.reproduciendo);
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));

      expect(llamadas.where((c) => c.method == 'listen'), hasLength(1));
    },
  );

  testWidgets('el visualizador sigue dibujando sus barras sin el opt-in', (
    tester,
  ) async {
    final estado = StreamController<EstadoReproduccion>.broadcast();
    final sesion = StreamController<int?>.broadcast();
    addTearDown(estado.close);
    addTearDown(sesion.close);

    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: VisualizadorAudio(
            estadoStream: estado.stream,
            androidAudioSessionIdStream: sesion.stream,
            barras: 12,
            barrasDiscretas: true,
          ),
        ),
      ),
    );
    await tester.pump();

    for (var i = 0; i < 12; i++) {
      expect(find.byKey(Key('visualizador-barra-$i')), findsOneWidget);
    }
  });
}