import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:news/data/models/NewsModel.dart';
import 'package:news/utils/api.dart';
import 'package:news/utils/strings.dart';

abstract class GeneralNewsState {}

class GeneralNewsInitial extends GeneralNewsState {}

class GeneralNewsFetchInProgress extends GeneralNewsState {}

class GeneralNewsFetchSuccess extends GeneralNewsState {
  final List<NewsModel> generalNews;
  final int totalCount;
  final bool hasMoreFetchError;
  final bool hasMore;

  GeneralNewsFetchSuccess({required this.totalCount, required this.hasMoreFetchError, required this.hasMore, required this.generalNews});
}

class GeneralNewsFetchFailure extends GeneralNewsState {
  final String errorMessage;

  GeneralNewsFetchFailure(this.errorMessage);
}

class GeneralNewsCubit extends Cubit<GeneralNewsState> {
  GeneralNewsCubit() : super(GeneralNewsInitial());

  Future<dynamic> getGeneralNews({required String langId, String? latitude, String? longitude, int? offset, String? newsSlug}) async {
    emit(GeneralNewsInitial());
    try {
      final body = {LANGUAGE_ID: langId, LIMIT: 20};

      if (latitude != null && latitude != "null") body[LATITUDE] = latitude;
      if (longitude != null && longitude != "null") body[LONGITUDE] = longitude;
      if (offset != null) body[OFFSET] = offset;
      if (newsSlug != null && newsSlug != "null" && newsSlug.trim().isNotEmpty) body[SLUG] = newsSlug; // used in case of native link , details screen redirection

      final result = await Api.sendApiRequest(body: body, url: Api.getNewsApi);
      if (!result[ERROR]) {
        emit(GeneralNewsFetchSuccess(
            generalNews: (result[DATA] as List).map((e) => NewsModel.fromJson(e)).toList(), totalCount: result[TOTAL], hasMoreFetchError: false, hasMore: result[DATA].length < result[TOTAL]));
      } else {
        emit(GeneralNewsFetchFailure(result[MESSAGE]));
      }
      return result;
    } catch (e) {
      throw ApiMessageAndCodeException(errorMessage: e.toString());
    }
  }

  bool hasMoreGeneralNews() {
    return (state is GeneralNewsFetchSuccess) ? (state as GeneralNewsFetchSuccess).hasMore : false;
  }

  void getMoreGeneralNews({required String langId, String? latitude, String? longitude}) async {
    if (state is GeneralNewsFetchSuccess) {
      try {
        final result = await getGeneralNews(langId: langId, latitude: latitude, longitude: longitude, offset: (state as GeneralNewsFetchSuccess).generalNews.length);
        if (!result[ERROR]) {
          List<NewsModel> updatedResults = (state as GeneralNewsFetchSuccess).generalNews;
          updatedResults.addAll((result[DATA] as List).map((e) => NewsModel.fromJson(e)).toList());
          emit(GeneralNewsFetchSuccess(generalNews: updatedResults, totalCount: result[TOTAL], hasMoreFetchError: false, hasMore: updatedResults.length < result[TOTAL]));
        } else {
          emit(GeneralNewsFetchFailure(result[MESSAGE]));
        }
      } catch (e) {
        emit(GeneralNewsFetchSuccess(
            generalNews: (state as GeneralNewsFetchSuccess).generalNews,
            hasMoreFetchError: true,
            totalCount: (state as GeneralNewsFetchSuccess).totalCount,
            hasMore: (state as GeneralNewsFetchSuccess).hasMore));
      }
    }
  }
}