elcaribe/news-app/lib/cubits/Bookmark/bookmarkCubit.dart

import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:news/data/models/NewsModel.dart';
import 'package:news/data/repositories/Bookmark/bookmarkRepository.dart';
import 'package:news/utils/strings.dart';

abstract class BookmarkState {}

class BookmarkInitial extends BookmarkState {}

class BookmarkFetchInProgress extends BookmarkState {}

class BookmarkFetchSuccess extends BookmarkState {
  final List<NewsModel> bookmark;
  final int totalBookmarkCount;
  final bool hasMoreFetchError;
  final bool hasMore;

  BookmarkFetchSuccess({required this.bookmark, required this.totalBookmarkCount, required this.hasMoreFetchError, required this.hasMore});
}

class BookmarkFetchFailure extends BookmarkState {
  final String errorMessage;

  BookmarkFetchFailure(this.errorMessage);
}

class BookmarkCubit extends Cubit<BookmarkState> {
  final BookmarkRepository bookmarkRepository;
  int perPageLimit = 25;

  BookmarkCubit(this.bookmarkRepository) : super(BookmarkInitial());

  void getBookmark({required String langId}) async {
    emit(BookmarkFetchInProgress());

    try {
      final result = await bookmarkRepository.getBookmark(limit: perPageLimit.toString(), offset: "0", langId: langId);

      if (result[ERROR]) {
        final message = result[MESSAGE];
        if (message == "No Data Found") {
          emit(BookmarkFetchSuccess(bookmark: [], totalBookmarkCount: 0, hasMoreFetchError: false, hasMore: false));
        } else {
          emit(BookmarkFetchFailure(message));
        }
        return;
      }

      final bookmarks = result['Bookmark'] as List<NewsModel>;
      final total = result[TOTAL] as int;

      emit(BookmarkFetchSuccess(bookmark: bookmarks, totalBookmarkCount: total, hasMoreFetchError: false, hasMore: bookmarks.length < total));
    } catch (e) {
      final error = e.toString();
      emit(error == "No Data Found" ? BookmarkFetchSuccess(bookmark: [], totalBookmarkCount: 0, hasMoreFetchError: false, hasMore: false) : BookmarkFetchFailure(error));
    }
  }

  bool hasMoreBookmark() {
    return (state is BookmarkFetchSuccess) ? (state as BookmarkFetchSuccess).hasMore : false;
  }

  void getMoreBookmark({required String langId}) async {
    if (state is BookmarkFetchSuccess) {
      try {
        final result = await bookmarkRepository.getBookmark(limit: perPageLimit.toString(), offset: (state as BookmarkFetchSuccess).bookmark.length.toString(), langId: langId);
        List<NewsModel> updatedResults = (state as BookmarkFetchSuccess).bookmark;
        updatedResults.addAll(result['Bookmark'] as List<NewsModel>);
        emit(BookmarkFetchSuccess(bookmark: updatedResults, totalBookmarkCount: result[TOTAL], hasMoreFetchError: false, hasMore: updatedResults.length < result[TOTAL]));
      } catch (e) {
        emit(BookmarkFetchSuccess(
            bookmark: (state as BookmarkFetchSuccess).bookmark,
            hasMoreFetchError: (e.toString() == "No Data Found") ? false : true,
            totalBookmarkCount: (state as BookmarkFetchSuccess).totalBookmarkCount,
            hasMore: (state as BookmarkFetchSuccess).hasMore));
      }
    }
  }

  void addBookmarkNews(NewsModel model) {
    if (state is BookmarkFetchSuccess) {
      List<NewsModel> bookmarklist = [];
      bookmarklist.insert(0, model);
      bookmarklist.addAll((state as BookmarkFetchSuccess).bookmark);

      emit(BookmarkFetchSuccess(
          bookmark: List.from(bookmarklist), hasMoreFetchError: true, totalBookmarkCount: (state as BookmarkFetchSuccess).totalBookmarkCount, hasMore: (state as BookmarkFetchSuccess).hasMore));
    }
  }

  void removeBookmarkNews(NewsModel model) {
    if (state is BookmarkFetchSuccess) {
      final bookmark = (state as BookmarkFetchSuccess).bookmark;
      bookmark.removeWhere(((element) => (element.id == model.id || element.newsId == model.id)));
      emit(BookmarkFetchSuccess(
          bookmark: List.from(bookmark), hasMoreFetchError: true, totalBookmarkCount: (state as BookmarkFetchSuccess).totalBookmarkCount, hasMore: (state as BookmarkFetchSuccess).hasMore));
    }
  }

  bool isNewsBookmark(String newsId) {
    if (state is BookmarkFetchSuccess) {
      final bookmark = (state as BookmarkFetchSuccess).bookmark;
      return (bookmark.isNotEmpty) ? (bookmark.indexWhere((element) => (element.newsId == newsId || element.id == newsId)) != -1) : false;
    }
    return false;
  }

  void resetState() {
    emit(BookmarkFetchInProgress());
  }
}