cb_prestige_qr/lib/features/scan/presentation/manager/scan_controller.dart

import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:cb_prestige_qr/features/scan/scan_providers.dart';

part 'scan_controller.g.dart';

class ScanState {
  const ScanState({
    this.isScanning = true,
    this.isProcessing = false,
    this.scannedValue,
    this.errorMessage,
  });

  final bool isScanning;
  final bool isProcessing;
  final String? scannedValue;
  final String? errorMessage;

  static const _sentinel = Object();

  ScanState copyWith({
    bool? isScanning,
    bool? isProcessing,
    Object? scannedValue = _sentinel,
    Object? errorMessage = _sentinel,
  }) {
    return ScanState(
      isScanning: isScanning ?? this.isScanning,
      isProcessing: isProcessing ?? this.isProcessing,
      scannedValue:
          identical(scannedValue, _sentinel) ? this.scannedValue : scannedValue as String?,
      errorMessage:
          identical(errorMessage, _sentinel) ? this.errorMessage : errorMessage as String?,
    );
  }
}

@riverpod
class ScanController extends _$ScanController {
  @override
  ScanState build() => const ScanState();

  Future<void> onBarcodeDetected(String value) async {
    if (!state.isScanning || state.isProcessing) return;
    state = state.copyWith(
      isScanning: false,
      isProcessing: true,
      errorMessage: null,
    );

    try {
      final result = await ref.read(processScanUseCaseProvider)(value);
      state = state.copyWith(
        isProcessing: false,
        scannedValue: result.rawValue,
      );
    } catch (e) {
      state = state.copyWith(
        isProcessing: false,
        isScanning: true,
        scannedValue: null,
        errorMessage: e.toString(),
      );
    }
  }

  void resumeScanning() {
    state = const ScanState(isScanning: true, isProcessing: false, scannedValue: null, errorMessage: null);
  }
}