import 'package:vibration/vibration.dart';
import 'package:pad_scanner/services/sound_service.dart';

/// Unified feedback events used across the app.
enum FeedbackEvent {
  scanValid, // Valid barcode scanned  → beep + short vibrate
  scanInvalid, // Invalid barcode       → error sound + short vibrate
  submitSuccess, // Submit succeeded     → success sound + long vibrate
  submitFailure, // Submit failed        → failure sound + short vibrate
  duplicateError, // Duplicate (shelf)    → alert loop + continuous vibrate
  networkError, // Network error         → failure sound + short vibrate
  duplicateBoxNo, // Duplicate box no     → failure sound + short vibrate
  alreadyCompleted, // Zongpai already boxed → beep + double vibrate
  modeSwitch, // Mode toggle           → beep only
  paichanSwitch, // Paichan changed      → beep + short vibrate
}

/// Centralized feedback dispatcher.
///
/// Each page manages its own bottom status bar state; this service handles
/// the sound, vibration channels only.
class FeedbackService {
  final SoundService _soundService;

  FeedbackService({SoundService? soundService})
    : _soundService = soundService ?? SoundService();

  /// Trigger feedback for the given [event].
  Future<void> trigger(FeedbackEvent event) async {
    switch (event) {
      case FeedbackEvent.scanValid:
        _soundService.playBeep();
        _vibrateShort();

      case FeedbackEvent.scanInvalid:
        _soundService.playError();
        _vibrateShort();

      case FeedbackEvent.submitSuccess:
        _soundService.playSuccess();
        _vibrateLong();

      case FeedbackEvent.submitFailure:
        _soundService.playFailure();
        _vibrateShort();

      case FeedbackEvent.duplicateError:
        _soundService.playAlertLoop();
        _vibratePattern();

      case FeedbackEvent.networkError:
        _soundService.playFailure();
        _vibrateShort();

      case FeedbackEvent.duplicateBoxNo:
        _soundService.playFailure();
        _vibrateShort();

      case FeedbackEvent.alreadyCompleted:
        _soundService.playBeep();
        _vibrateDouble();

      case FeedbackEvent.modeSwitch:
        _soundService.playBeep();

      case FeedbackEvent.paichanSwitch:
        _soundService.playBeep();
        _vibrateShort();
    }
  }

  /// Stop any ongoing alert (e.g. when duplicate dialog is closed).
  Future<void> stopAlert() async {
    _soundService.stopAlert();
  }

  void _vibrateShort() {
    Vibration.vibrate(duration: 100);
  }

  void _vibrateLong() {
    Vibration.vibrate(duration: 200);
  }

  /// Continuous vibration pattern: 3 bursts to signal critical error.
  void _vibratePattern() {
    Vibration.vibrate(pattern: [0, 300, 100, 300, 100, 300]);
  }

  /// Two short bursts to signal an already-completed item.
  void _vibrateDouble() {
    Vibration.vibrate(pattern: [0, 200, 100, 200]);
  }

  Future<void> dispose() async {
    await _soundService.dispose();
  }
}