import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:gps/blocs/bloc_provider.dart';
import 'package:gps/blocs/gps_bloc.dart';
import 'package:gps/utils/environment.dart';
import 'package:gps/utils/gps_persister.dart';
import 'package:gps/utils/gps_utils.dart';
import 'package:gps/widgets/gps_buttons_widget_bloc.dart';
import 'package:gps/widgets/gps_position_widget_bloc.dart';
import 'package:gps/widgets/gps_title_widget_bloc.dart';
import 'package:location/location.dart';

void main() {
  runApp(const GpsBlocApp());
}

class GpsBlocApp extends StatefulWidget {
  const GpsBlocApp({Key? key}) : super(key: key);

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

class GpsBlocAppState extends State<GpsBlocApp> {
  Locale locale = AppLocalizations.supportedLocales.first;
  StreamSubscription<LocationData>? gps;

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

  @override
  void deactivate() {
    gps?.cancel();
    super.deactivate();
  }

  void _nextLocale() {
    const locales = AppLocalizations.supportedLocales;
    final nextIdx = (locales.indexOf(locale) + 1) % locales.length;

    setState(() {
      locale = locales[nextIdx];
    });
  }

  @override
  Widget build(BuildContext context) {
    GpsBloc myBloc = GpsBloc(CsvGpsPersister(Environment.storageDir()));
    gps = GpsUtils().stream.listen((event) {
      myBloc.gpsIn.add(event);
    });

    return MaterialApp(
      onGenerateTitle: (BuildContext context) =>
          AppLocalizations.of(context)!.appName,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      locale: locale,
      localizationsDelegates: AppLocalizations.localizationsDelegates,
      supportedLocales: AppLocalizations.supportedLocales,
      home: BlocProvider<GpsBloc>(
        bloc: myBloc,
        child: buildScaffold(context),
      ),
    );
  }

  Widget buildScaffold(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const GpsTitleWidgetBloc(),
        ),
        body: Center(
            child: Column(children: const [
          GpsPositionWidget(),
          GpsButtonsWidgetBloc(),
        ])),
        floatingActionButton: FloatingActionButton(
          onPressed: _nextLocale,
          child: const Icon(Icons.update),
        ));
  }
}