import 'dart:developer';
import 'package:business_panel/core/config/api_config.dart';
import 'package:business_panel/core/services/token_storage_service.dart';
import 'package:business_panel/core/utils/logging_interceptor.dart';
import 'package:dio/dio.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'discount_event.dart';
import 'discount_state.dart';

class DiscountBloc extends Bloc<DiscountEvent, DiscountState> {
  final Dio _dio = Dio();
  final TokenStorageService _tokenStorage = TokenStorageService();

  DiscountBloc() : super(const DiscountState()) {
    _dio.interceptors.add(LoggingInterceptor());

    on<FetchDiscountDetails>((event, emit) async {
      emit(state.copyWith(isLoadingDetails: true, errorMessage: null));
      try {
        final token = await _tokenStorage.getAccessToken();
        if (token == null) {
          emit(
            state.copyWith(
              isLoadingDetails: false,
              errorMessage: "خطای احراز هویت.",
            ),
          );
          return;
        }

        final response = await _dio.get(
          ApiConfig.getDiscountById(event.discountId),
          options: Options(headers: {'Authorization': 'Bearer $token'}),
        );

        if (response.statusCode == 200 && response.data['data'] != null) {
          final data = response.data['data'];

          List<Map<String, String?>> images = [];
          if (data['Images'] is List) {
            images = (data['Images'] as List)
                .map<Map<String, String?>>(
                  (img) => {
                    'id': img['ID'] as String?,
                    'url': img['Url'] as String?,
                  },
                )
                .where((img) => img['url'] != null)
                .toList();
          }

          final name = data['Name'] ?? '';
          final typeId = data['Type']?['ID'];
          final description = data['Description'] ?? '';
          final price = data['Price']?.toString() ?? '0';
          final nPrice = data['NPrice']?.toString() ?? '0';
          final startDate =
              data['StartDate'] != null ? DateTime.tryParse(data['StartDate']) : null;
          final endDate =
              data['EndDate'] != null ? DateTime.tryParse(data['EndDate']) : null;
          final startTime = data['StartTime'];
          final endTime = data['EndTime'];
          final radius = (data['Radius'] as num?)?.toDouble() ?? 0.0;

          emit(
            state.copyWith(
              isLoadingDetails: false,
              discountId: data['_id'],
              productName: name,
              productImages: images,
              discountTypeId: typeId,
              description: description,
              price: price,
              discountedPrice: nPrice,
              startDate: startDate,
              endDate: endDate,
              startTime: startTime,
              endTime: endTime,
              notificationRadius: radius,
            ),
          );
        } else {
          emit(
            state.copyWith(
              isLoadingDetails: false,
              errorMessage: "تخفیف یافت نشد.",
            ),
          );
        }
      } catch (e) {
        emit(
          state.copyWith(
            isLoadingDetails: false,
            errorMessage: 'خطا در دریافت اطلاعات.',
          ),
        );
      }
    });

    on<ProductImageAdded>((event, emit) {
      List<Map<String, String?>> updatedImages = List.from(state.productImages);
      final newImageMap = {'id': null, 'url': event.imagePath};

      if (updatedImages.length > event.index) {
        updatedImages[event.index] = newImageMap;
      } else {
        updatedImages.add(newImageMap);
      }
      emit(state.copyWith(productImages: updatedImages));
    });

    on<ProductNameChanged>((event, emit) {
      emit(state.copyWith(productName: event.name));
    });

    on<DiscountTypeChanged>((event, emit) {
      emit(state.copyWith(discountTypeId: event.typeId));
    });

    on<DescriptionChanged>((event, emit) {
      emit(state.copyWith(description: event.description));
    });

    on<ValidityDateChanged>((event, emit) {
      emit(state.copyWith(startDate: event.startDate, endDate: event.endDate));
    });

    on<TimeRangeChanged>((event, emit) {
      emit(state.copyWith(startTime: event.startTime, endTime: event.endTime));
    });

    on<PriceChanged>((event, emit) {
      emit(state.copyWith(price: event.price));
    });

    on<DiscountedPriceChanged>((event, emit) {
      emit(state.copyWith(discountedPrice: event.price));
    });

    on<NotificationRadiusChanged>((event, emit) {
      emit(state.copyWith(notificationRadius: event.radius));
    });

    on<SubmitDiscount>((event, emit) async {
      await _submitDiscountForm(emit, isEdit: false);
    });

    on<UpdateDiscount>((event, emit) async {
      await _submitDiscountForm(
        emit,
        isEdit: true,
        discountId: event.discountId,
      );
    });

    on<ClearErrorMessage>((event, emit) {
      emit(state.copyWith(clearErrorMessage: true));
    });
  }

  Future<void> _submitDiscountForm(
    Emitter<DiscountState> emit, {
    required bool isEdit,
    String? discountId,
  }) async {
    emit(state.copyWith(isSubmitting: true, errorMessage: null));

    try {
      final token = await _tokenStorage.getAccessToken();
      if (token == null) {
        emit(
          state.copyWith(isSubmitting: false, errorMessage: "خطای احراز هویت."),
        );
        return;
      }

      final Map<String, dynamic> data = {
        'Name': state.productName,
        'Type': state.discountTypeId,
        'Description': state.description,
        'Price': double.tryParse(state.price),
        'NPrice': double.tryParse(state.discountedPrice),
        'Start': state.startDate?.toUtc().toIso8601String(),
        'End': state.endDate?.toUtc().toIso8601String(),
        'StartTime': state.startTime,
        'EndTime': state.endTime,
        'Radius': state.notificationRadius,
      };

      List<MultipartFile> newImageFiles = [];
      List<String> existingImageIds = [];

      for (var imageMap in state.productImages) {
        final id = imageMap['id'];
        final url = imageMap['url'];

        if (id != null && url != null && url.startsWith('http')) {
          existingImageIds.add(id);
        } else if (url != null && !url.startsWith('http')) {
          newImageFiles.add(
            await MultipartFile.fromFile(url, filename: url.split('/').last),
          );
        }
      }

      if (newImageFiles.isNotEmpty) {
        data['Images'] = newImageFiles;
      }

      if (isEdit) {
        data['Picture'] = existingImageIds;
      }
      
      log('Submitting Discount Data: $data', name: 'DiscountBloc');

      final formData = FormData.fromMap(data);
      final url =
          isEdit ? ApiConfig.editDiscount(discountId!) : ApiConfig.addDiscount;

      await _dio.post(
        url,
        data: formData,
        options: Options(headers: {'Authorization': 'Bearer $token'}),
      );

      emit(state.copyWith(isSubmitting: false, isSuccess: true));
    }on DioException catch (e) {
      emit(
        state.copyWith(
          isSubmitting: false,
          errorMessage: e.response?.data['message'] ?? 'خطای سرور.',
        ),
      );
    } catch (e) {
      emit(
        state.copyWith(
          isSubmitting: false,
          errorMessage: 'خطای ناشناخته: ${e.toString()}',
        ),
      );
    }
  }
}