import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'app.dart';
import 'core/api.dart';
import 'core/config.dart';
import 'core/format.dart';
import 'core/http_api.dart';
import 'core/models.dart';
import 'core/providers.dart';
import 'core/theme.dart';
import 'widgets/ui.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final Api api = HttpApi(
    baseUrl: AppConfig.apiBaseUrl,
    prefs: await SharedPreferences.getInstance(),
  );
  runApp(_Boot(api));
}

class _Boot extends StatefulWidget {
  const _Boot(this.api);
  final Api api;

  @override
  State<_Boot> createState() => _BootState();
}

class _BootState extends State<_Boot> {
  late final Future<AppUser?> _user = widget.api.restore().catchError(
    (Object _) => null,
  );

  @override
  Widget build(BuildContext context) => FutureBuilder<AppUser?>(
    future: _user,
    builder: (context, snap) {
      if (snap.connectionState != ConnectionState.done) {
        return const _Splash();
      }
      return ProviderScope(
        overrides: [
          apiProvider.overrideWithValue(widget.api),
          startDateProvider.overrideWithValue(dateOnly(widget.api.now)),
          sessionProvider.overrideWith(() => SessionNotifier(snap.data)),
        ],
        child: const SrsApp(),
      );
    },
  );
}

class _Splash extends StatelessWidget {
  const _Splash();

  @override
  Widget build(BuildContext context) => Directionality(
    textDirection: TextDirection.ltr,
    child: DecoratedBox(
      decoration: const BoxDecoration(
        gradient: LinearGradient(
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
          colors: [C.navy, C.navyDeep],
        ),
      ),
      child: const Center(child: BrandCoin(size: 96)),
    ),
  );
}