mobile-app/lib/presentation/screens/notification/sc_notification.dart

import 'package:farm_tpf/custom_model/NotificationDTO.dart';
import 'package:farm_tpf/data/repository/repository.dart';
import 'package:farm_tpf/presentation/custom_widgets/app_bar_widget.dart';
import 'package:farm_tpf/presentation/custom_widgets/bottom_loader.dart';
import 'package:farm_tpf/presentation/custom_widgets/dash_line_widget.dart';
import 'package:farm_tpf/presentation/custom_widgets/loading_list_page.dart';
import 'package:farm_tpf/presentation/screens/plot_detail/sc_plot_detail.dart';
import 'package:farm_tpf/presentation/screens/plot_detail/sc_plot_information.dart';
import 'package:farm_tpf/utils/const_icons.dart';
import 'package:farm_tpf/utils/pref.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:farm_tpf/utils/formatter.dart';
import 'package:flutter_svg/svg.dart';

import 'bloc/noti_bloc.dart';

class NotificationScreen extends StatefulWidget {
  @override
  _NotificationScreenState createState() => _NotificationScreenState();
}

class _NotificationScreenState extends State<NotificationScreen> {
  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  var notiBloc = NotiBloc(repository: Repository());

  @override
  void initState() {
    super.initState();
    _firebaseMessaging.configure(
        onMessage: (Map<String, dynamic> message) async {
      print("onMessage: $message");
      try {
        notiBloc.add(OnRefreshFromNotification());
      } catch (e) {
        print(e);
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder(
        cubit: notiBloc,
        builder: (context, state) {
          return HoldInfinityWidget(
            notiBloc: notiBloc,
          );
        });
  }
}

class HoldInfinityWidget extends StatelessWidget {
  final NotiBloc notiBloc;
  HoldInfinityWidget({@required this.notiBloc});
  final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        key: _scaffoldKey,
        appBar: AppBarWidget(
          isBack: false,
        ),
        body: BlocBuilder<NotiBloc, NotiState>(
          cubit: notiBloc,
          builder: (context, state) {
            return InfinityView(
              notiBloc: notiBloc,
            );
          },
        ));
  }
}

class InfinityView extends StatefulWidget {
  final NotiBloc notiBloc;
  InfinityView({@required this.notiBloc});
  @override
  _InfinityViewState createState() => _InfinityViewState();
}

class _InfinityViewState extends State<InfinityView> {
  final _scrollController = ScrollController();
  final _scrollThreshold = 250.0;
  List<NotificationDTO> currentItems = new List<NotificationDTO>();
  int latestId = 0;
  int currentPage = 0;
  bool currentHasReachedMax = true;
  bool isUpdatingFromApi = true;

  var pref = LocalPref();
  var token;
  Future<Null> getSharedPrefs() async {
    _scrollController.addListener(() {
      final maxScroll = _scrollController.position.maxScrollExtent;
      final currentScroll = _scrollController.position.pixels;
      if (maxScroll - currentScroll < _scrollThreshold) {
        widget.notiBloc.add(DataFetched());
      }
    });
    token = await pref.getString(DATA_CONST.TOKEN_KEY);
  }

  @override
  void initState() {
    getSharedPrefs();
    widget.notiBloc.add(DataFetched());
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<NotiBloc, NotiState>(
      cubit: widget.notiBloc,
      builder: (context, state) {
        if (state is NotiFailure) {
          return Center(child: Text(state.errorString));
        } else if (state is NotiSuccess) {
          if (state.items.isEmpty) {
            return Center(child: Text("Không có thông báo"));
          }
          currentItems = List<NotificationDTO>.from(state.items);
          currentPage = state.page;
          currentHasReachedMax = state.hasReachedMax;
          return Column(
            children: <Widget>[
              Container(
                  padding: EdgeInsets.all(8),
                  color: Colors.white,
                  child: Row(
                    children: [
                      Expanded(
                          child: Text(
                        'Thông báo',
                        style: TextStyle(
                            fontWeight: FontWeight.w500, fontSize: 22),
                      )),
                      BlocBuilder<NotiBloc, NotiState>(
                        cubit: widget.notiBloc,
                        builder: (context, state) {
                          if (state is NotiSuccess) {
                            if (state.items.length > 0) {
                              return FlatButton(
                                  onPressed: () {
                                    widget.notiBloc.add(
                                        MarkAllNotificationUpdate(status: "1"));
                                  },
                                  child: Text('Đánh dấu đã đọc tất cả',
                                      style: TextStyle(
                                          fontWeight: FontWeight.normal,
                                          fontSize: 14,
                                          color: Colors.blue)));
                            } else {
                              return SizedBox();
                            }
                          } else {
                            return SizedBox();
                          }
                        },
                      )
                    ],
                  )),
              Expanded(
                  child: RefreshIndicator(
                      child: ListView.builder(
                        itemBuilder: (BuildContext context, int index) {
                          return index >= state.items.length
                              ? BottomLoader()
                              : ItemInfinityWidget(
                                  notiBloc: widget.notiBloc,
                                  unread: state.unread,
                                  read: state.read,
                                  currentItems: currentItems,
                                  item: state.items[index],
                                  currentPage: state.page,
                                  currentReachedMax: state.hasReachedMax,
                                );
                        },
                        itemCount: state.hasReachedMax
                            ? state.items.length
                            : state.items.length + 1,
                        controller: _scrollController,
                      ),
                      onRefresh: () async {
                        widget.notiBloc.add(OnRefresh());
                      }))
            ],
          );
        } else if (state is NotiLoadding) {
          return Center(
            child: LoadingListPage(),
          );
        }
        return Container();
      },
    );
  }

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

class ItemInfinityWidget extends StatelessWidget {
  final int unread;
  final int read;
  final NotificationDTO item;
  final List<NotificationDTO> currentItems;
  final int currentPage;
  final bool currentReachedMax;
  final NotiBloc notiBloc;

  const ItemInfinityWidget(
      {Key key,
      @required this.unread,
      @required this.read,
      @required this.currentItems,
      @required this.item,
      @required this.currentPage,
      @required this.currentReachedMax,
      @required this.notiBloc})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        GestureDetector(
            child: Container(
                margin: EdgeInsets.all(4.0),
                child: Column(
                  children: [
                    ListTile(
                        title: Text(item.subject),
                        subtitle: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: <Widget>[
                            Text(item.message),
                            Row(children: [
                              Icon(Icons.access_time,
                                  color: item.isRead == 1
                                      ? Colors.grey
                                      : Colors.blue,
                                  size: 18),
                              SizedBox(
                                width: 4,
                              ),
                              Text(item.sendDate.format_DDMMYY_HHmm(),
                                  style: TextStyle(
                                      color: item.isRead == 1
                                          ? Colors.grey
                                          : Colors.blue))
                            ]),
                          ],
                        ),
                        leading: SvgPicture.asset(AppIcons.icNotificationItem)),
                  ],
                )),
            onTap: () {
              if (item.contents == "ENV_UPDATE") {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (BuildContext context) => PlotDetailScreen(
                              cropId: item.tbCropId,
                              cropType: item.type,
                            ))).then((value) {
                  if (item.isRead == 0) {
                    _updateReadNotification(
                        context: context,
                        unread: unread,
                        read: read,
                        item: item,
                        currentItems: currentItems,
                        currentPage: currentPage,
                        currentReachedMax: currentReachedMax);
                  }
                });
              } else if (item.contents == "PIC_UPDATE") {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (BuildContext context) =>
                            PlotInformationScreen(
                              cropId: item.tbCropId,
                            ))).then((value) {
                  if (item.isRead == 0) {
                    _updateReadNotification(
                        context: context,
                        unread: unread,
                        read: read,
                        item: item,
                        currentItems: currentItems,
                        currentPage: currentPage,
                        currentReachedMax: currentReachedMax);
                  }
                });
              } else {}
            }),
        Container(
            padding: EdgeInsets.only(left: 16, right: 16),
            child: DashLineWidget())
      ],
    );
  }

  _updateReadNotification(
      {BuildContext context,
      int unread,
      int read,
      NotificationDTO item,
      List<NotificationDTO> currentItems,
      int currentPage,
      bool currentReachedMax}) {
    List<NotificationDTO> updatedItems = new List<NotificationDTO>();
    currentItems.forEach((e) {
      if (e.id == item.id) {
        e.isRead = 1;
      } else {}
      updatedItems.add(NotificationDTO.clone(e));
    });

    notiBloc.add(OnUpdate<NotificationDTO>(
        unread: unread - 1,
        read: read + 1,
        currentItemId: item.id,
        currentItems: updatedItems,
        currentPage: currentPage,
        hasReachedMax: currentReachedMax));
  }
}