import 'package:flutter/material.dart';

import '../models/client.dart';
import '../services/client_repository.dart';

/// Création (client == null) ou édition d'une fiche client.
/// Retourne le [Client] créé/modifié via Navigator.pop, ou null si annulé.
class ClientEditScreen extends StatefulWidget {
  final Client? client;
  const ClientEditScreen({super.key, this.client});

  @override
  State<ClientEditScreen> createState() => _ClientEditScreenState();
}

class _ClientEditScreenState extends State<ClientEditScreen> {
  final _formKey = GlobalKey<FormState>();
  late final TextEditingController _nomCtrl;
  late final TextEditingController _prenomCtrl;
  late final TextEditingController _telCtrl;
  bool _enregistre = false;

  bool get _edition => widget.client != null;

  @override
  void initState() {
    super.initState();
    _nomCtrl = TextEditingController(text: widget.client?.nom ?? '');
    _prenomCtrl = TextEditingController(text: widget.client?.prenom ?? '');
    _telCtrl = TextEditingController(text: widget.client?.telephone ?? '');
  }

  @override
  void dispose() {
    _nomCtrl.dispose();
    _prenomCtrl.dispose();
    _telCtrl.dispose();
    super.dispose();
  }

  Future<void> _enregistrer() async {
    if (!_formKey.currentState!.validate()) return;
    setState(() => _enregistre = true);
    final repo = ClientRepository.instance;

    try {
      final Client resultat;
      if (_edition) {
        resultat = widget.client!.copyWith(
          nom: _nomCtrl.text.trim(),
          prenom: _prenomCtrl.text.trim(),
          telephone: _telCtrl.text.trim(),
        );
        await repo.modifier(resultat);
      } else {
        resultat = await repo.creer(
          nom: _nomCtrl.text.trim(),
          prenom: _prenomCtrl.text.trim(),
          telephone: _telCtrl.text.trim(),
        );
      }
      if (mounted) Navigator.of(context).pop(resultat);
    } catch (e) {
      if (mounted) {
        setState(() => _enregistre = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Erreur : $e')),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_edition ? 'Modifier le client' : 'Nouveau client'),
      ),
      body: Form(
        key: _formKey,
        child: ListView(
          padding: const EdgeInsets.all(16),
          children: [
            TextFormField(
              controller: _nomCtrl,
              textCapitalization: TextCapitalization.words,
              autofocus: !_edition,
              decoration: const InputDecoration(
                labelText: 'Nom *',
                prefixIcon: Icon(Icons.person_outline),
              ),
              validator: (v) =>
                  (v == null || v.trim().isEmpty) ? 'Nom obligatoire' : null,
            ),
            const SizedBox(height: 16),
            TextFormField(
              controller: _prenomCtrl,
              textCapitalization: TextCapitalization.words,
              decoration: const InputDecoration(
                labelText: 'Prénom',
                prefixIcon: Icon(Icons.badge_outlined),
              ),
            ),
            const SizedBox(height: 16),
            TextFormField(
              controller: _telCtrl,
              keyboardType: TextInputType.phone,
              decoration: const InputDecoration(
                labelText: 'Téléphone (facultatif)',
                prefixIcon: Icon(Icons.phone_outlined),
              ),
            ),
            const SizedBox(height: 24),
            FilledButton(
              onPressed: _enregistre ? null : _enregistrer,
              child: _enregistre
                  ? const SizedBox(
                      height: 22,
                      width: 22,
                      child: CircularProgressIndicator(
                          strokeWidth: 2, color: Colors.white),
                    )
                  : Text(_edition ? 'Enregistrer' : 'Créer le client'),
            ),
            if (!_edition) ...[
              const SizedBox(height: 16),
              const Text(
                'Un code de fidélité unique et son QR code seront générés automatiquement.',
                textAlign: TextAlign.center,
                style: TextStyle(fontSize: 13, color: Color(0xFF6B6B72)),
              ),
            ],
          ],
        ),
      ),
    );
  }
}