import 'package:flutter/material.dart';

import 'api.dart';
import 'screens.dart';

/// Админ-консоль «Феникс 6X» (m08): Flutter Web, Material 3,
/// тёмная тема (UI/UX-стандарт). Токен — sessionStorage; 401 → логин.
void main() => runApp(const AdminApp());

class AdminApp extends StatelessWidget {
  const AdminApp({super.key});

  @override
  Widget build(BuildContext context) => MaterialApp(
        title: 'Феникс 6X — консоль владельца',
        debugShowCheckedModeBanner: false,
        theme: ThemeData(
          brightness: Brightness.dark,
          colorSchemeSeed: const Color(0xFF4FC3F7),
          useMaterial3: true,
        ),
        home: const RootPage(),
      );
}

class RootPage extends StatefulWidget {
  const RootPage({super.key});

  @override
  State<RootPage> createState() => _RootPageState();
}

class _RootPageState extends State<RootPage> {
  int _index = 0;

  @override
  Widget build(BuildContext context) {
    if (!Api.authorized) return LoginPage(onDone: _reload);
    const pages = [
      AthletesPage(),
      WorkoutsPage(),
      ProgramsPage(),
      MetricsPage(),
      PlanPage(),
    ];
    return Scaffold(
      body: Row(
        children: [
          NavigationRail(
            selectedIndex: _index,
            onDestinationSelected: (i) => setState(() => _index = i),
            labelType: NavigationRailLabelType.all,
            destinations: const [
              NavigationRailDestination(
                  icon: Icon(Icons.people_outline),
                  selectedIcon: Icon(Icons.people),
                  label: Text('Атлеты')),
              NavigationRailDestination(
                  icon: Icon(Icons.fitness_center_outlined),
                  selectedIcon: Icon(Icons.fitness_center),
                  label: Text('Тренировки')),
              NavigationRailDestination(
                  icon: Icon(Icons.list_alt_outlined),
                  selectedIcon: Icon(Icons.list_alt),
                  label: Text('Программы')),
              NavigationRailDestination(
                  icon: Icon(Icons.insights_outlined),
                  selectedIcon: Icon(Icons.insights),
                  label: Text('Метрики')),
              NavigationRailDestination(
                  icon: Icon(Icons.event_available_outlined),
                  selectedIcon: Icon(Icons.event_available),
                  label: Text('План/факт')),
            ],
          ),
          const VerticalDivider(width: 1),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                Align(
                  alignment: Alignment.centerRight,
                  child: Padding(
                    padding: const EdgeInsets.all(8),
                    child: OutlinedButton(
                      onPressed: () {
                        Api.logout();
                        setState(() {});
                      },
                      child: const Text('Выйти'),
                    ),
                  ),
                ),
                Expanded(child: pages[_index]),
              ],
            ),
          ),
        ],
      ),
    );
  }

  void _reload() => setState(() {});
}

class LoginPage extends StatefulWidget {
  const LoginPage({super.key, required this.onDone});

  final VoidCallback onDone;

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _login = TextEditingController();
  final _password = TextEditingController();
  String? _error;

  @override
  Widget build(BuildContext context) => Scaffold(
        body: Center(
          child: SizedBox(
            width: 360,
            child: Card(
              child: Padding(
                padding: const EdgeInsets.all(24),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text('Феникс 6X',
                        style: Theme.of(context).textTheme.headlineMedium),
                    const Text('консоль владельца'),
                    const SizedBox(height: 24),
                    TextField(
                        controller: _login,
                        decoration: const InputDecoration(labelText: 'Логин')),
                    TextField(
                        controller: _password,
                        obscureText: true,
                        onSubmitted: (_) => _submit(),
                        decoration:
                            const InputDecoration(labelText: 'Пароль')),
                    const SizedBox(height: 16),
                    FilledButton(
                      onPressed: _submit,
                      child: const Text('Войти'),
                    ),
                    if (_error != null)
                      Padding(
                        padding: const EdgeInsets.only(top: 12),
                        child: Text(_error!,
                            style: const TextStyle(color: Colors.redAccent)),
                      ),
                  ],
                ),
              ),
            ),
          ),
        ),
      );

  Future<void> _submit() async {
    try {
      await Api.login(_login.text, _password.text);
      widget.onDone();
    } on UnauthorizedException {
      setState(() => _error = 'Неверный логин или пароль');
    } catch (e) {
      setState(() => _error = 'Ошибка: $e');
    }
  }
}