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/theme/app_colors.dart';

class RegisterScreen extends ConsumerStatefulWidget {
  const RegisterScreen({super.key});

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

class _RegisterScreenState extends ConsumerState<RegisterScreen> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  final _confirmPasswordController = TextEditingController();

  @override
  void dispose() {
    _nameController.dispose();
    _emailController.dispose();
    _passwordController.dispose();
    _confirmPasswordController.dispose();
    super.dispose();
  }

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

    ref.listen<AuthState>(authProvider, (previous, next) {
      if (next.status == AuthStatus.authenticated) {
        context.go('/home');
      }
      if (next.error != null) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text(next.error!),
            backgroundColor: AppColors.error,
          ),
        );
      }
    });

    return Scaffold(
      appBar: AppBar(title: const Text('Регистрация')),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                const SizedBox(height: 24),
                TextFormField(
                  controller: _nameController,
                  textCapitalization: TextCapitalization.words,
                  decoration: const InputDecoration(
                    labelText: 'Имя',
                    prefixIcon: Icon(Icons.person_outlined),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Введите имя';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: _emailController,
                  keyboardType: TextInputType.emailAddress,
                  decoration: const InputDecoration(
                    labelText: 'Email',
                    prefixIcon: Icon(Icons.email_outlined),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Введите email';
                    }
                    if (!RegExp(r'^[^@]+@[^@]+\.[^@]+').hasMatch(value)) {
                      return 'Некорректный email';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: _passwordController,
                  obscureText: true,
                  decoration: const InputDecoration(
                    labelText: 'Пароль',
                    prefixIcon: Icon(Icons.lock_outlined),
                  ),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return 'Введите пароль';
                    }
                    if (value.length < 6) {
                      return 'Минимум 6 символов';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: _confirmPasswordController,
                  obscureText: true,
                  decoration: const InputDecoration(
                    labelText: 'Подтверждение пароля',
                    prefixIcon: Icon(Icons.lock_outlined),
                  ),
                  validator: (value) {
                    if (value != _passwordController.text) {
                      return 'Пароли не совпадают';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 32),
                ElevatedButton(
                  onPressed: authState.isLoading ? null : _register,
                  child: authState.isLoading
                      ? const SizedBox(
                          height: 20,
                          width: 20,
                          child: CircularProgressIndicator(strokeWidth: 2),
                        )
                      : const Text('Зарегистрироваться'),
                ),
                const SizedBox(height: 16),
                TextButton(
                  onPressed: () => context.go('/auth/login'),
                  child: const Text('Уже есть аккаунт? Войти'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  void _register() {
    if (_formKey.currentState!.validate()) {
      ref.read(authProvider.notifier).register(
            _emailController.text.trim(),
            _passwordController.text,
            _nameController.text.trim(),
          );
    }
  }
}