import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';

class LoginController with ChangeNotifier {
  final FirebaseAuth _auth = FirebaseAuth.instance;

  final TextEditingController emailController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();
  
  bool _isLoading = false;
  bool _obscurePassword = true;
  String? _emailError;
  String? _passwordError;

  bool get isLoading => _isLoading;
  bool get obscurePassword => _obscurePassword;
  String? get emailError => _emailError;
  String? get passwordError => _passwordError;

  void togglePasswordVisibility() {
    _obscurePassword = !_obscurePassword;
    notifyListeners();
  }

  String? validateEmail(String? value) {
    if (value == null || value.isEmpty) return 'Por favor, insira o seu email';
    final emailRegex = RegExp(r'^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$');
    if (!emailRegex.hasMatch(value)) return 'Por favor, insira um email válido';
    return null;
  }

  String? validatePassword(String? value) {
    if (value == null || value.isEmpty) return 'Por favor, insira a sua password';
    if (value.length < 6) return 'A password deve ter pelo menos 6 caracteres';
    return null;
  }

  // --- MÉTODO PARA ENTRAR (LOGIN) ---
  Future<bool> login() async {
    _emailError = validateEmail(emailController.text);
    _passwordError = validatePassword(passwordController.text);

    if (_emailError != null || _passwordError != null) {
      notifyListeners();
      return false;
    }

    _isLoading = true;
    notifyListeners();

    try {
      await _auth.signInWithEmailAndPassword(
        email: emailController.text.trim(),
        password: passwordController.text.trim(),
      );
      _isLoading = false;
      notifyListeners();
      return true;
    } on FirebaseAuthException catch (e) {
      _isLoading = false;
      _handleFirebaseError(e.code);
      notifyListeners();
      return false;
    }
  }

  // --- MÉTODO PARA CRIAR CONTA (SIGN UP) ---
  Future<bool> signUp() async {
    _emailError = validateEmail(emailController.text);
    _passwordError = validatePassword(passwordController.text);

    if (_emailError != null || _passwordError != null) {
      notifyListeners();
      return false;
    }

    _isLoading = true;
    notifyListeners();

    try {
      await _auth.createUserWithEmailAndPassword(
        email: emailController.text.trim(),
        password: passwordController.text.trim(),
      );
      _isLoading = false;
      notifyListeners();
      return true;
    } on FirebaseAuthException catch (e) {
      _isLoading = false;
      _handleFirebaseError(e.code);
      notifyListeners();
      return false;
    }
  }

  void _handleFirebaseError(String code) {
    switch (code) {
      case 'email-already-in-use':
        _emailError = 'Este e-mail já está a ser utilizado.';
        break;
      case 'invalid-credential':
        _emailError = 'E-mail ou password incorretos.';
        break;
      case 'user-not-found':
        _emailError = 'Utilizador não encontrado.';
        break;
      case 'wrong-password':
        _passwordError = 'Palavra-passe incorreta.';
        break;
      case 'weak-password':
        _passwordError = 'A password é demasiado fraca.';
        break;
      default:
        _emailError = 'Erro: $code';
    }
  }

  @override
  void dispose() {
    emailController.dispose();
    passwordController.dispose();
    super.dispose();
  }
}