import 'package:flutter/material.dart';

import '../services/auth_service.dart';

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

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

class _RegisterScreenState extends State<RegisterScreen> {
  final _formKey = GlobalKey<FormState>();
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();
  final _confirmController = TextEditingController();
  bool _loading = false;

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

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

    setState(() => _loading = true);
    try {
      await AuthService.instance.registerWithEmailPassword(
        email: _emailController.text.trim(),
        password: _passwordController.text,
      );
      if (!mounted) return;
      Navigator.of(context).pop();
    } catch (e) {
      if (!mounted) return;
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(e.toString())),
      );
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Register')),
      body: Center(
        child: ConstrainedBox(
          constraints: const BoxConstraints(maxWidth: 420),
          child: Card(
            margin: const EdgeInsets.all(20),
            child: Padding(
              padding: const EdgeInsets.all(20),
              child: Form(
                key: _formKey,
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    TextFormField(
                      controller: _emailController,
                      decoration: const InputDecoration(labelText: 'Email'),
                      validator: (value) =>
                          (value == null || value.trim().isEmpty)
                              ? 'Email is required'
                              : null,
                    ),
                    const SizedBox(height: 12),
                    TextFormField(
                      controller: _passwordController,
                      obscureText: true,
                      decoration:
                          const InputDecoration(labelText: 'Password (min 6)'),
                      validator: (value) {
                        if (value == null || value.isEmpty) {
                          return 'Password is required';
                        }
                        if (value.length < 6) {
                          return 'Must be at least 6 characters';
                        }
                        return null;
                      },
                    ),
                    const SizedBox(height: 12),
                    TextFormField(
                      controller: _confirmController,
                      obscureText: true,
                      decoration:
                          const InputDecoration(labelText: 'Confirm Password'),
                      validator: (value) {
                        if (value != _passwordController.text) {
                          return 'Passwords do not match';
                        }
                        return null;
                      },
                    ),
                    const SizedBox(height: 16),
                    SizedBox(
                      width: double.infinity,
                      child: FilledButton(
                        onPressed: _loading ? null : _register,
                        child: _loading
                            ? const SizedBox(
                                width: 18,
                                height: 18,
                                child:
                                    CircularProgressIndicator(strokeWidth: 2),
                              )
                            : const Text('Create Account'),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}