import 'dart:async';

import 'package:pluriwave/l10n/gen/app_localizations.dart';
import 'package:pluriwave/modelos/alarma_musical.dart';
import 'package:pluriwave/servicios/servicio_alarmas_android.dart';
import 'package:pluriwave/servicios/servicio_grabacion_radio.dart';

/// Shared fake of the Android alarm bridge for alarm-related tests.
class FakePuertoAlarmasAndroid implements PuertoAlarmasAndroid {
  final programadas = <AlarmaMusical>[];
  final canceladas = <String>[];
  final detenidas = <String>[];
  final ocultadas = <String>[];
  final soloOcultadas = <String>[];
  final ejecucionesNativas = <EjecucionAlarmaNativa>[];
  final snoozesNativos = <EstadoSnoozeNativo>[];
  final fallosProgramacionNativos = <FalloProgramacionNativo>[];
  final _eventos = StreamController<EventoAlarmaAndroid>.broadcast();
  bool ignoraOptimizacionBateria = true;
  int solicitudesExencionBateria = 0;
  int aperturasConfiguracionNotificaciones = 0;

  /// Extra diagnostico() fields (fix/alarmas-fiabilidad diagnostics screen).
  /// Default values mirror the previous hardcoded literals in [diagnostico],
  /// so every existing test that never sets these keeps seeing the exact
  /// same snapshot as before.
  bool puedeProgramarExactas = true;
  bool notificacionesPermitidas = true;
  bool puedeUsarPantallaCompleta = true;
  String fabricante = 'test';
  int versionSdk = 35;

  /// Ids [programar] most recently scheduled as active-with-a-next-run (kept
  /// in sync with [cancelar] too), mirroring the real native scheduler's own
  /// pending-alarm registry (fix/alarmas-fallos-silenciosos, item 3: "verify
  /// the alarm is actually registered"). Backs [alarmasNativasPendientes]'s
  /// DEFAULT so a test that never touches that field gets a value that
  /// tracks reality instead of a frozen `0` -- a test that explicitly
  /// assigns the field (many `pantalla_diagnostico_alarmas_test.dart` cases
  /// do, to model a stale/corrupt native count on purpose) keeps getting
  /// EXACTLY that value regardless of what programar/cancelar do afterward.
  final _idsRegistradosNativamente = <String>{};
  int? _alarmasNativasPendientesFijado;

  int get alarmasNativasPendientes =>
      _alarmasNativasPendientesFijado ?? _idsRegistradosNativamente.length;

  set alarmasNativasPendientes(int valor) =>
      _alarmasNativasPendientesFijado = valor;

  /// Test-only failure switch (diagnostics screen, "intent not resolving"
  /// coverage): when true, every `abrir*`/`solicitar*` system-screen action
  /// below reports failure (as a real device does when a ROM lacks that
  /// settings screen), while still recording the attempt via its counter.
  bool fallaAccionSistema = false;

  /// Test-only failure switch (Design D7): when true, [programar] throws
  /// instead of scheduling, enabling failure-path coverage that the fake
  /// could not otherwise produce.
  bool fallaProgramar = false;

  /// Test-only PER-ALARM failure switch (fix/alarmas-fallos-silenciosos):
  /// [programar] throws only for ids in this set, letting a test simulate
  /// one alarm failing to schedule while its siblings succeed -- the global
  /// [fallaProgramar] switch cannot express that (it fails everything).
  final Set<String> idsFallanProgramar = {};

  /// Test-only failure switch: when true, [detenerSonidoActivo] reports an
  /// unconfirmed/failed stop instead of a confirmed one.
  bool fallaDetener = false;

  /// Simulates [PluriWaveAlarmService.activeRingingId]: the id the fake
  /// reports as currently ringing, or null if nothing rings.
  String? alarmaSonandoIdValor;

  /// Test-only failure switch (Finding 2, fail-toward-silence): when true,
  /// [alarmaSonandoId] throws instead of returning a value, exercising the
  /// [detenerSonidoNativo] fallback in `EstadoAlarmas._detenerSiEstaSonando`.
  bool fallaConsultaSonando = false;

  /// Every alarm id [detenerSonidoActivo] was invoked for, in call order.
  final detencionesActivas = <String>[];

  /// Test-only gate (RES-2 guard test): when set, [detenerSonidoActivo]
  /// awaits it before resolving, letting tests exercise an overlapping
  /// in-flight call.
  Completer<void>? detenerActivoGate;

  /// Simulates a native -> Flutter `alarmFired` MethodChannel event.
  void emitirEvento(EventoAlarmaAndroid evento) => _eventos.add(evento);

  @override
  Stream<EventoAlarmaAndroid> get eventosAlarma => _eventos.stream;

  @override
  void configurarLocalizaciones(AppLocalizations l10n) {}

  @override
  Future<void> programar(AlarmaMusical alarma) async {
    if (fallaProgramar || idsFallanProgramar.contains(alarma.id)) {
      throw StateError('fake programar failure');
    }
    programadas.add(alarma);
    if (alarma.activa && alarma.proximaProgramable != null) {
      _idsRegistradosNativamente.add(alarma.id);
    } else {
      _idsRegistradosNativamente.remove(alarma.id);
    }
  }

  @override
  Future<void> cancelar(String alarmaId) async {
    canceladas.add(alarmaId);
    _idsRegistradosNativamente.remove(alarmaId);
  }

  @override
  Future<void> detenerSonidoNativo(String alarmaId) async {
    detenidas.add(alarmaId);
  }

  @override
  Future<String?> alarmaSonandoId() async {
    if (fallaConsultaSonando) {
      throw StateError('fake alarmaSonandoId failure');
    }
    return alarmaSonandoIdValor;
  }

  @override
  Future<ResultadoDetencion> detenerSonidoActivo() async {
    detencionesActivas.add(alarmaSonandoIdValor ?? '');
    final gate = detenerActivoGate;
    if (gate != null) await gate.future;
    if (fallaDetener) {
      return const ResultadoDetencion(detenido: false, estabaSonando: true);
    }
    return ResultadoDetencion(
      detenido: true,
      estabaSonando: alarmaSonandoIdValor != null,
      alarmaId: alarmaSonandoIdValor,
    );
  }

  @override
  Future<void> ocultarNotificacionAlarma(String alarmaId) async {
    ocultadas.add(alarmaId);
  }

  @override
  Future<void> ocultarSoloNotificacion(String alarmaId) async {
    soloOcultadas.add(alarmaId);
  }

  @override
  Future<DiagnosticoAlarmasAndroid> diagnostico() async =>
      DiagnosticoAlarmasAndroid(
        puedeProgramarExactas: puedeProgramarExactas,
        notificacionesPermitidas: notificacionesPermitidas,
        puedeUsarPantallaCompleta: puedeUsarPantallaCompleta,
        ignoraOptimizacionBateria: ignoraOptimizacionBateria,
        alarmasNativasPendientes: alarmasNativasPendientes,
        fabricante: fabricante,
        versionSdk: versionSdk,
      );

  @override
  Future<bool> solicitarExencionBateria() async {
    solicitudesExencionBateria++;
    return !fallaAccionSistema;
  }

  @override
  Future<bool> abrirConfiguracionNotificaciones() async {
    aperturasConfiguracionNotificaciones++;
    return !fallaAccionSistema;
  }

  @override
  Future<EventoAlarmaAndroid?> obtenerEventoInicial() async => null;

  @override
  Future<List<EjecucionAlarmaNativa>>
  obtenerEjecucionesNativasGestionadas() async => ejecucionesNativas;

  @override
  Future<List<EstadoSnoozeNativo>> obtenerEstadoSnoozeNativo() async =>
      List.of(snoozesNativos);

  @override
  Future<List<FalloProgramacionNativo>>
  obtenerFallosProgramacionNativos() async =>
      List.of(fallosProgramacionNativos);

  int solicitudesPermisoAlarmasExactas = 0;
  int solicitudesPermisoPantallaCompleta = 0;

  /// Native-recorded failures the next read should return. Tests seed this
  /// to simulate a pre-notice that never armed, a refused foreground-service
  /// start, or a per-alarm reschedule that failed after a reboot.
  List<FalloProgramacionNativo> fallosNativos = const [];

  int lecturasFallosNativos = 0;

  /// Simulates an older native build with no such channel method.
  bool fallaLecturaFallosNativos = false;

  @override
  Future<List<FalloProgramacionNativo>> fallosNativosProgramacion() async {
    lecturasFallosNativos++;
    if (fallaLecturaFallosNativos) {
      throw StateError('canal no disponible');
    }
    return fallosNativos;
  }

  @override
  Future<bool> solicitarPermisoAlarmasExactas() async {
    solicitudesPermisoAlarmasExactas++;
    return !fallaAccionSistema;
  }

  @override
  Future<bool> solicitarPermisoNotificaciones() async => true;

  @override
  Future<bool> solicitarPermisoPantallaCompleta() async {
    solicitudesPermisoPantallaCompleta++;
    return !fallaAccionSistema;
  }

  Future<void> dispose() => _eventos.close();
}

/// Inactive recording service fake, safe for widget tests.
class FakeServicioGrabacionRadioInactiva extends ServicioGrabacionRadio {
  final _controller = StreamController<EstadoGrabacionRadio>.broadcast();

  @override
  EstadoGrabacionRadio get estado => const EstadoGrabacionRadio.inactiva();

  @override
  Stream<EstadoGrabacionRadio> get estadoStream => _controller.stream;

  @override
  Future<void> inicializar() async {}

  @override
  Future<void> dispose() => _controller.close();
}