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';

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

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

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

  @override
  void initState() {
    context
        .read<FoodEntryBloc>()
        .add(PageBeingInitialized(forDate: widget.date));
    super.initState();
  }

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

  @override
  Widget build(BuildContext context) {
    super.build(context);

    return BlocConsumer<FoodEntryBloc, GlobalEntryState>(
      listener: (context, pageState) {
        if (pageState.errorString != null) {
          showNewSnackbarWith(context, pageState.errorString!);
        }
      },
      builder: (context, globalState) {
        return Scaffold(
            appBar: AppBar(
              title: Text(DateFormat.yMMMMd('de').format(widget.date)),
              actions: const [ThemeSwitcherButton()],
            ),
            body: FoodEntryList(
                entries: globalState.foodEntries[widget.date] ?? [],
                date: widget.date),
            bottomNavigationBar: BottomAppBar(
                shape: const RectangularNotchShape(),
                color: Theme.of(context).colorScheme.secondary,
                child: SumWidget(
                    foodEntries: globalState.foodEntries[widget.date] ?? [])),
            drawer: const AppDrawer(),
            floatingActionButton: OverflowBar(children: [
              ScanFoodFloatingButton(
                onPressed: () {
                  var result = BarcodeScanner.scan();
                  context.read<FoodEntryBloc>().add(
                        BarcodeScanned(
                          scanResultFuture: result,
                          forDate: widget.date,
                        ),
                      );
                },
              ),
              const SizedBox(width: 8),
              CalendarFloatingButton(
                startFromDate: widget.date,
                onDateSelected: (dateSelected) {
                  widget.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);
  }

  @override
  bool get wantKeepAlive => true;
}

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);
}