elcaribe/news-app/lib/ui/screens/BookmarkScreen.dart

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:news/app/routes.dart';
import 'package:news/cubits/appLocalizationCubit.dart';
import 'package:news/cubits/Bookmark/bookmarkCubit.dart';
import 'package:news/data/models/NewsModel.dart';
import 'package:news/ui/widgets/customAppBar.dart';
import 'package:news/ui/widgets/customTextLabel.dart';
import 'package:news/ui/widgets/errorContainerWidget.dart';
import 'package:news/ui/widgets/newsCard.dart';
import 'package:news/ui/widgets/shimmerNewsList.dart';
import 'package:news/utils/ErrorMessageKeys.dart';
import 'package:news/utils/internetConnectivity.dart';
import 'package:news/utils/uiUtils.dart';

class BookmarkScreen extends StatefulWidget {
  const BookmarkScreen({super.key});

  @override
  BookmarkScreenState createState() => BookmarkScreenState();
}

class BookmarkScreenState extends State<BookmarkScreen> {
  late final ScrollController _controller = ScrollController()..addListener(hasMoreBookmarkScrollListener);

  @override
  void initState() {
    super.initState();
    getBookMark();
  }

  void getBookMark() async {
    if (await InternetConnectivity.isNetworkAvailable()) {
      context.read<BookmarkCubit>().getBookmark(langId: context.read<AppLocalizationCubit>().state.id);
    }
  }

  void hasMoreBookmarkScrollListener() {
    if (_controller.position.maxScrollExtent == _controller.offset) {
      if (context.read<BookmarkCubit>().hasMoreBookmark()) {
        context.read<BookmarkCubit>().getMoreBookmark(langId: context.read<AppLocalizationCubit>().state.id);
      }
    }
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: CustomAppBar(height: 45, isBackBtn: true, label: 'bookmarkLbl', horizontalPad: 15, isConvertText: true),
        body: Padding(
            padding: const EdgeInsetsDirectional.only(bottom: 10.0),
            child: BlocBuilder<BookmarkCubit, BookmarkState>(
              builder: (context, state) {
                if (state is BookmarkFetchSuccess && state.bookmark.isNotEmpty) {
                  return Padding(
                    padding: const EdgeInsetsDirectional.only(start: 15.0, end: 15.0, top: 10.0, bottom: 10.0),
                    child: RefreshIndicator(
                      onRefresh: () async {
                        getBookMark();
                      },
                      child: ListView.builder(
                          controller: _controller,
                          physics: const AlwaysScrollableScrollPhysics(),
                          itemCount: state.bookmark.length,
                          itemBuilder: (context, index) {
                            return _buildBookmarkContainer(model: state.bookmark[index], hasMore: state.hasMore, hasMoreBookFetchError: state.hasMoreFetchError, index: index, totalCurrentBook: 6);
                          }),
                    ),
                  );
                } else if (state is BookmarkFetchFailure || ((state is! BookmarkFetchInProgress))) {
                  if (state is BookmarkFetchFailure) {
                    return ErrorContainerWidget(
                        errorMsg: (state.errorMessage.contains(ErrorMessageKeys.noInternet)) ? UiUtils.getTranslatedLabel(context, 'internetmsg') : state.errorMessage, onRetry: getBookMark);
                  } else {
                    return const Center(child: CustomTextLabel(text: 'bookmarkNotAvail', textAlign: TextAlign.center));
                  }
                }
                //default/Processing state
                return Padding(padding: const EdgeInsets.only(bottom: 10.0, left: 10.0, right: 10.0), child: ShimmerNewsList(isNews: false));
              },
            )));
  }

  _buildBookmarkContainer({required NewsModel model, required int index, required int totalCurrentBook, required bool hasMoreBookFetchError, required bool hasMore}) {
    if (index == totalCurrentBook - 1 && index != 0 && hasMore) {
      if (hasMoreBookFetchError) {
        return Center(
            child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 15.0, vertical: 8.0),
                child: IconButton(
                    onPressed: () {
                      context.read<BookmarkCubit>().getMoreBookmark(langId: context.read<AppLocalizationCubit>().state.id);
                    },
                    icon: Icon(Icons.error, color: Theme.of(context).primaryColor))));
      }
    }

    return Padding(
        padding: const EdgeInsetsDirectional.only(top: 15.0),
        child: NewsCard(
            newsDetail: model,
            showViews: true,
            onTap: () async {
              //Interstitial Ad here
              UiUtils.showInterstitialAds(context: context);
              Navigator.of(context).pushNamed(Routes.newsDetails, arguments: {"model": model, "isFromBreak": false, "fromShowMore": false});
            }));
  }
}