import 'package:dio/dio.dart';
import 'package:eatvio_app/features/barcode/models/barcode_product_model.dart';
import 'package:eatvio_app/features/barcode/services/barcode_service.dart';

class BarcodeRepository {
  final BarcodeService barcodeService;
  final Dio dio;

  BarcodeRepository({
    required this.barcodeService,
    required this.dio,
  });

  /// Получить информацию о продукте по штрихкоду
  /// Возвращает либо данные продукта, либо статус задачи обработки
  Future<BarcodeResult> getProductByBarcode(String barcode) async {
    final response = await dio.get<Map<String, dynamic>>(
      '/api/gsone/barcode/$barcode',
      options: Options(validateStatus: (_) => true),
    );

    final code = response.statusCode ?? 0;
    final data = response.data;
    if (data is! Map<String, dynamic>) {
      throw DioException(
        requestOptions: response.requestOptions,
        response: response,
        message: 'Invalid barcode response',
      );
    }
    if (code == 200) {
      final product = BarcodeProductModel.fromJson(data);
      return BarcodeResult.success(product);
    }
    if (code == 202) {
      final taskStatus = BarcodeTaskStatusModel.fromJson(data);
      return BarcodeResult.processing(taskStatus.taskId ?? '');
    }

    throw DioException(
      requestOptions: response.requestOptions,
      response: response,
      message: 'Unexpected status code: $code',
    );
  }

  /// Получить статус задачи обработки
  Future<BarcodeTaskStatus> getTaskStatus(String taskId) async {
    final statusModel = await barcodeService.getTaskStatus(taskId: taskId);

    if (statusModel.status == 'completed' && statusModel.data != null) {
      return BarcodeTaskStatus.completed(statusModel.data!);
    } else if (statusModel.status == 'failed') {
      return BarcodeTaskStatus.failed();
    } else {
      return BarcodeTaskStatus.processing();
    }
  }
}

/// Результат запроса информации о продукте по штрихкоду
class BarcodeResult {
  final BarcodeResultType type;
  final BarcodeProductModel? product;
  final String? taskId;

  BarcodeResult._({required this.type, this.product, this.taskId});

  factory BarcodeResult.success(BarcodeProductModel product) {
    return BarcodeResult._(type: BarcodeResultType.success, product: product);
  }

  factory BarcodeResult.processing(String taskId) {
    return BarcodeResult._(type: BarcodeResultType.processing, taskId: taskId);
  }
}

enum BarcodeResultType {
  success,
  processing,
}

/// Статус задачи обработки
class BarcodeTaskStatus {
  final BarcodeTaskStatusType type;
  final BarcodeProductModel? product;

  BarcodeTaskStatus._({required this.type, this.product});

  factory BarcodeTaskStatus.completed(BarcodeProductModel product) {
    return BarcodeTaskStatus._(type: BarcodeTaskStatusType.completed, product: product);
  }

  factory BarcodeTaskStatus.processing() {
    return BarcodeTaskStatus._(type: BarcodeTaskStatusType.processing);
  }

  factory BarcodeTaskStatus.failed() {
    return BarcodeTaskStatus._(type: BarcodeTaskStatusType.failed);
  }
}

enum BarcodeTaskStatusType {
  completed,
  processing,
  failed,
}