import 'package:barcode_scan2/barcode_scan2.dart';
import 'package:calorimeter/food_scan/food_fact_lookup.dart';
import 'package:calorimeter/utils/enter_food_controller.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<FoodEntry>> entriesFuture;
  List<FoodEntry> 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: [
                    ChangeNotifierProvider(
                        create: (context) => EnterFoodController()),
                    BlocProvider(
                      create: (context) => FoodEntryBloc(
                        initialState: FoodEntryState(foodEntries: entries),
                        storage: storage,
                        forDate: widget.date,
                      ),
                    )
                  ],
                  child: BlocBuilder<FoodEntryBloc, FoodEntryState>(
                      builder: (context, state) {
                    return Scaffold(
                        appBar: AppBar(
                          title:
                              Text(DateFormat.yMMMMd('de').format(widget.date)),
                          actions: const [ThemeSwitcherButton()],
                        ),
                        body: FoodEntryList(entries: state.foodEntries),
                        bottomNavigationBar: BottomAppBar(
                            shape: const RectangularNotchShape(),
                            color: Theme.of(context).colorScheme.secondary,
                            child: SumWidget(foodEntries: state.foodEntries)),
                        drawer: const AppDrawer(),
                        floatingActionButton: OverflowBar(children: [
                          ScanFoodFloatingButton(
                            onPressed: () async {
                              var client = FoodFactLookupClient();

                              var scanResult = await BarcodeScanner.scan();

                              if (scanResult.type == ResultType.Cancelled) {
                                return;
                              }

                              if (!context.mounted) return;

                              if (scanResult.type == ResultType.Error) {
                                showNewSnackbarWith(context,
                                    "Fehler beim Scannen des Barcodes.");
                              }
                              var response = await client
                                  .retrieveFoodInfo(scanResult.rawContent);

                              if (!context.mounted) return;

                              if (response.status ==
                                  FoodFactResponseStatus.barcodeNotFound) {
                                showNewSnackbarWith(context,
                                    "Barcode konnte nicht gefunden werden.");
                                return;
                              }

                              if (response.status ==
                                  FoodFactResponseStatus
                                      .foodFactServerNotReachable) {
                                showNewSnackbarWith(context,
                                    "OpenFoodFacts-Server konnte nicht erreicht werden.");
                                return;
                              }

                              context.read<EnterFoodController>().set(
                                    response.food!.name,
                                    response.food!.kcalPer100g.toString(),
                                  );
                            },
                          ),
                          const SizedBox(width: 8),
                          CalendarFloatingButton(
                            startFromDate: widget.date,
                            onDateSelected: (dateSelected) {
                              Navigator.of(context).push(
                                MaterialPageRoute(
                                  builder: (context) {
                                    return PerDateWidget(date: dateSelected);
                                  },
                                ),
                              );
                            },
                          ),
                        ]),
                        floatingActionButtonLocation:
                            FloatingActionButtonLocation.endDocked);
                  }),
                );
        });
  }

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

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

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);
}