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

import '../../../core/auth/auth_provider.dart';
import '../../../core/router/app_router.dart';

/// Écran d'inscription utilisateur.
class RegisterScreen extends ConsumerStatefulWidget {
  const RegisterScreen({super.key});

  @override
  ConsumerState<RegisterScreen> createState() => _RegisterScreenState();
}

class _RegisterScreenState extends ConsumerState<RegisterScreen> {
  final _formKey = GlobalKey<FormState>();
  final _firstNameController = TextEditingController();
  final _lastNameController = TextEditingController();
  final _emailController = TextEditingController();
  final _phoneController = TextEditingController();
  final _passwordController = TextEditingController();

  @override
  void dispose() {
    _firstNameController.dispose();
    _lastNameController.dispose();
    _emailController.dispose();
    _phoneController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  Future<void> _submit() async {
    if (!_formKey.currentState!.validate()) return;

    final success = await ref.read(authProvider.notifier).register(
          firstName: _firstNameController.text.trim(),
          lastName: _lastNameController.text.trim(),
          email: _emailController.text.trim(),
          password: _passwordController.text,
          phone: _phoneController.text.trim().isEmpty
              ? null
              : _phoneController.text.trim(),
        );

    if (success && mounted) {
      context.go(AppRoutes.home);
    }
  }

  @override
  Widget build(BuildContext context) {
    final authState = ref.watch(authProvider);

    return Scaffold(
      appBar: AppBar(title: const Text('Inscription')),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                TextFormField(
                  controller: _firstNameController,
                  decoration: const InputDecoration(labelText: 'Prénom'),
                  validator: (v) => v == null || v.isEmpty ? 'Prénom requis' : null,
                ),
                const SizedBox(height: 12),
                TextFormField(
                  controller: _lastNameController,
                  decoration: const InputDecoration(labelText: 'Nom'),
                  validator: (v) => v == null || v.isEmpty ? 'Nom requis' : null,
                ),
                const SizedBox(height: 12),
                TextFormField(
                  controller: _emailController,
                  keyboardType: TextInputType.emailAddress,
                  decoration: const InputDecoration(labelText: 'Email'),
                  validator: (v) => v == null || v.isEmpty ? 'Email requis' : null,
                ),
                const SizedBox(height: 12),
                TextFormField(
                  controller: _phoneController,
                  keyboardType: TextInputType.phone,
                  decoration: const InputDecoration(labelText: 'Téléphone (optionnel)'),
                ),
                const SizedBox(height: 12),
                TextFormField(
                  controller: _passwordController,
                  obscureText: true,
                  decoration: const InputDecoration(labelText: 'Mot de passe'),
                  validator: (v) {
                    if (v == null || v.length < 8) {
                      return 'Minimum 8 caractères';
                    }
                    return null;
                  },
                ),
                if (authState.error != null) ...[
                  const SizedBox(height: 12),
                  Text(
                    authState.error!,
                    style: TextStyle(color: Theme.of(context).colorScheme.error),
                  ),
                ],
                const SizedBox(height: 24),
                ElevatedButton(
                  onPressed: authState.isLoading ? null : _submit,
                  child: authState.isLoading
                      ? const SizedBox(
                          height: 20,
                          width: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Text('S\'inscrire'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}