calorimeter/lib/perdate/perdate_widget.dart

import 'package:barcode_scan2/barcode_scan2.dart';
import 'package:calorimeter/utils/scan_food_floating_button.dart';
import 'package:calorimeter/utils/app_drawer.dart';
import 'package:calorimeter/food_entry/food_entry_bloc.dart';
import 'package:calorimeter/perdate/entry_list.dart';
import 'package:calorimeter/storage/storage.dart';
import 'package:calorimeter/utils/calendar_floating_button.dart';
import 'package:calorimeter/utils/rectangular_notch_shape.dart';
import 'package:calorimeter/utils/sum_widget.dart';
import 'package:calorimeter/utils/theme_switcher_button.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';

class PerDateWidget extends StatefulWidget {
  final DateTime date;
  const PerDateWidget({super.key, required this.date});

  @override
  State<PerDateWidget> createState() => _PerDateWidgetState();
}

class _PerDateWidgetState extends State<PerDateWidget> {
  late FoodStorage storage;
  late Future<List<FoodEntryState>> entriesFuture;
  List<FoodEntryState> entries = [];

  @override
  void initState() {
    storage = FoodStorage.getInstance();
    entriesFuture = storage.getEntriesForDate(widget.date);
    entriesFuture.then((val) {
      entries = val;
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
        future: entriesFuture,
        builder: (context, snapshot) {
          return snapshot.connectionState != ConnectionState.done
              ? const Center(child: CircularProgressIndicator())
              : MultiProvider(
                  providers: [
                    BlocProvider(
                      create: (context) => FoodEntryBloc(
                        initialState: PageState(foodEntries: entries),
                        storage: storage,
                        forDate: widget.date,
                      ),
                    )
                  ],
                  child: BlocConsumer<FoodEntryBloc, PageState>(
                      listener: (context, pageState) {
                    if (pageState.errorString != null) {
                      showNewSnackbarWith(context, pageState.errorString!);
                    }
                  }, builder: (context, pageState) {
                    return Scaffold(
                        appBar: AppBar(
                          title:
                              Text(DateFormat.yMMMMd('de').format(widget.date)),
                          actions: const [ThemeSwitcherButton()],
                        ),
                        body: FoodEntryList(entries: pageState.foodEntries),
                        bottomNavigationBar: BottomAppBar(
                            shape: const RectangularNotchShape(),
                            color: Theme.of(context).colorScheme.secondary,
                            child:
                                SumWidget(foodEntries: pageState.foodEntries)),
                        drawer: const AppDrawer(),
                        floatingActionButton: OverflowBar(children: [
                          ScanFoodFloatingButton(
                            onPressed: () {
                              var result = BarcodeScanner.scan();
                              context.read<FoodEntryBloc>().add(
                                  BarcodeScanned(scanResultFuture: result));
                            },
                          ),
                          const SizedBox(width: 8),
                          CalendarFloatingButton(
                            startFromDate: widget.date,
                            onDateSelected: (dateSelected) {
                              _onDateSelected(dateSelected);
                            },
                          ),
                        ]),
                        floatingActionButtonLocation:
                            FloatingActionButtonLocation.endDocked);
                  }),
                );
        });
  }

  void showNewSnackbarWith(BuildContext context, String text) {
    var snackbar =
        ErrorSnackbar(colorScheme: Theme.of(context).colorScheme, text: text);

    ScaffoldMessenger.of(context)
      ..removeCurrentSnackBar()
      ..showSnackBar(snackbar);
  }

  void _onDateSelected(DateTime date) {
    Navigator.of(context).push(
      MaterialPageRoute(
        builder: (context) {
          return PerDateWidget(date: date);
        },
      ),
    ).then((val) {
      setState(
        () {
          entriesFuture = storage.getEntriesForDate(widget.date);
          entriesFuture.then(
            (val) {
              entries = val;
            },
          );
        },
      );
    });
  }
}

class ErrorSnackbar extends SnackBar {
  final String text;
  final ColorScheme colorScheme;
  ErrorSnackbar({
    required this.text,
    required this.colorScheme,
    super.key,
  }) : super(
            content: Text(text, style: TextStyle(color: colorScheme.onError)),
            backgroundColor: colorScheme.error);
}