import 'package:flutter/material.dart';

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

class Depense {
  final String nom;
  final double montant;

  Depense({required this.nom, required this.montant});
}

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool _darkMode = false;
  String _currency = '€';

  void _changeCurrency(String value) {
    setState(() {
      _currency = value;
    });
  }

  void _toggleTheme(bool value) {
    setState(() {
      _darkMode = value;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Gestion Finance',

      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.deepPurple,
          brightness: Brightness.light,
        ),
      ),

      darkTheme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.deepPurple,
          brightness: Brightness.dark,
        ),
      ),

      themeMode: _darkMode ? ThemeMode.dark : ThemeMode.light,

      home: MyHomePage(
        onThemeChanged: _toggleTheme,
        darkMode: _darkMode,
        currency: _currency,
        onCurrencyChanged: _changeCurrency,
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final Function(bool) onThemeChanged;
  final bool darkMode;
  final String currency;
  final Function(String) onCurrencyChanged;

  const MyHomePage({
    super.key,
    required this.onThemeChanged,
    required this.darkMode,
    required this.currency,
    required this.onCurrencyChanged,
  });

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final List<Depense> _depenses = [];

  final TextEditingController _nomController = TextEditingController();
  final TextEditingController _montantController = TextEditingController();

  void _ajouterDepense() {
    showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          title: const Text('Nouvelle dépense'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              TextField(
                controller: _nomController,
                decoration: const InputDecoration(labelText: 'Nom'),
              ),
              const SizedBox(height: 16),
              TextField(
                controller: _montantController,
                keyboardType: TextInputType.number,
                decoration: const InputDecoration(labelText: 'Montant'),
              ),
            ],
          ),
          actions: [
            TextButton(
              onPressed: () {
                Navigator.pop(context);
              },
              child: const Text('Annuler'),
            ),
            ElevatedButton(
              onPressed: () {
                setState(() {
                  _depenses.add(
                    Depense(
                      nom: _nomController.text,
                      montant: double.tryParse(_montantController.text) ?? 0,
                    ),
                  );
                });

                _nomController.clear();
                _montantController.clear();

                Navigator.pop(context);
              },
              child: const Text('Ajouter'),
            ),
          ],
        );
      },
    );
  }

  double get _total {
    return _depenses.fold(0, (sum, item) => sum + item.montant);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Gestion des dépenses'),
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        actions: [
          IconButton(
            icon: const Icon(Icons.settings),
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => SettingsPage(
                    darkMode: widget.darkMode,
                    onThemeChanged: widget.onThemeChanged,
                    currency: widget.currency,
                    onCurrencyChanged: widget.onCurrencyChanged,
                  ),
                ),
              );
            },
          ),
        ],
      ),
      body: Column(
        children: [
          Container(
            width: double.infinity,
            padding: const EdgeInsets.all(16),
            color: Colors.deepPurple.shade100,
            child: Text(
              'Total : ${_total.toStringAsFixed(2)} ${widget.currency}',
              style: const TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
            ),
          ),

          Expanded(
            child: _depenses.isEmpty
                ? const Center(child: Text('Aucune dépense'))
                : ListView.builder(
                    itemCount: _depenses.length,
                    itemBuilder: (context, index) {
                      final depense = _depenses[index];

                      return Dismissible(
                        key: Key(depense.nom + index.toString()),

                        direction: DismissDirection.startToEnd,

                        onDismissed: (direction) {
                          setState(() {
                            _depenses.removeAt(index);
                          });

                          ScaffoldMessenger.of(context).showSnackBar(
                            SnackBar(content: Text('${depense.nom} supprimé')),
                          );
                        },

                        background: Container(
                          alignment: Alignment.centerLeft,
                          padding: const EdgeInsets.symmetric(horizontal: 20),
                          color: Colors.red,
                          child: const Icon(Icons.delete, color: Colors.white),
                        ),

                        child: ListTile(
                          leading: const Icon(Icons.money_off),
                          title: Text(depense.nom),
                          trailing: Text(
                            '${depense.montant.toStringAsFixed(2)} ${widget.currency}',
                          ),
                        ),
                      );
                    },
                  ),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _ajouterDepense,
        child: const Icon(Icons.add),
      ),
    );
  }
}

class SettingsPage extends StatelessWidget {
  final bool darkMode;
  final Function(bool) onThemeChanged;
  final String currency;
  final Function(String) onCurrencyChanged;

  const SettingsPage({
    super.key,
    required this.darkMode,
    required this.onThemeChanged,
    required this.currency,
    required this.onCurrencyChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Paramètres')),
      body: ListView(
        children: [
          SwitchListTile(
            title: const Text('Mode sombre'),
            value: darkMode,
            onChanged: onThemeChanged,
          ),
          ListTile(
            title: const Text('Devise'),
            trailing: DropdownButton<String>(
              value: currency,
              items: const [
                DropdownMenuItem(value: '€', child: Text('Euro (€)')),
                DropdownMenuItem(value: '\$', child: Text('Dollar (\$)')),
                DropdownMenuItem(value: '£', child: Text('Livre (£)')),
                DropdownMenuItem(value: '¥', child: Text('Yen (¥)')),
              ],
              onChanged: (value) {
                if (value != null) {
                  onCurrencyChanged(value);
                }
              },
            ),
          ),
        ],
      ),
    );
  }
}