import 'package:appwrite/appwrite.dart' as account_models;
import 'package:appwrite/models.dart' as user_models;
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:appwrite/appwrite.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:flutter/foundation.dart';

import '../routes/app_routes.dart';

class LoginController extends GetxController {
  final _account = Rxn<account_models.Account>();
  late TextEditingController mailController;
  late TextEditingController passwordController;
  late TextEditingController nameController;
  final _endpoint = dotenv.env['APPWRITE_ENDPOINT_URL'] ?? '';
  final _projectId = dotenv.env['APPWRITE_PROJECT_ID'] ?? '';
  final bool _selfSigned =
      (dotenv.env['APPWRITE_SELF_SIGNED'] ?? 'false').toLowerCase() == 'true';
  final _logedInUser = Rxn<user_models.User>();
  final formKey = GlobalKey<FormState>();
  final isLogIn = false.obs;

  account_models.Account? get account => _account.value;
  user_models.User? get logedInUser => _logedInUser.value;

  // Sichere Getter für Controller
  String get safeEmail => _isControllerValid(mailController) ? mailController.text : '';
  String get safePassword => _isControllerValid(passwordController) ? passwordController.text : '';
  String get safeName => _isControllerValid(nameController) ? nameController.text : '';
  
  // Hilfsmethode zur Controller-Validierung
  bool _isControllerValid(TextEditingController? controller) {
    try {
      if (controller == null) return false;
      // Teste ob der Controller noch verwendbar ist
      controller.text;
      return true;
    } catch (e) {
      return false;
    }
  }

  @override
  void onInit() {
    // Initialisiere TextEditingController
    mailController = TextEditingController();
    passwordController = TextEditingController();
    nameController = TextEditingController();
    // Initialisiere Client
    Client client = Client().setEndpoint(_endpoint).setProject(_projectId);
    // Optional: Unsichere/self-signed Zertifikate im Dev zulassen (nicht im Web wirksam)
    if (!kIsWeb && _selfSigned) {
      client.setSelfSigned(status: true);
    }
    _account.value = Account(client);
    super.onInit();
  }

  emailValidator(String? value) {
    if (value == null || value.isEmpty) {
      return 'Please enter your email';
    }
    final emailRegex = RegExp(r'^[^@]+@[^@]+\.[^@]+');
    if (!emailRegex.hasMatch(value)) {
      return 'Please enter a valid email address';
    }
    return null;
  }

  passwordValidator(String? value) {
    if (value == null || value.isEmpty) {
      return 'Please enter your password';
    }
    if (value.length < 6) {
      return 'Password must be at least 6 characters long';
    }
    return null;
  }

  nameValidator(String? value) {
    if (value == null || value.isEmpty) {
      return 'Please enter your name';
    }
    return null;
  }

  Future<void> login() async {
    logout();
    try {
      // Sichere Controller-Zugriffe
      if (!_isControllerValid(mailController) || !_isControllerValid(passwordController)) {
        Get.snackbar(
          'Fehler',
          'Formular nicht verfügbar. Bitte laden Sie die Seite neu.',
          snackPosition: SnackPosition.BOTTOM,
          backgroundColor: Colors.red.shade500,
        );
        return;
      }

      var result = await _account.value!.createEmailPasswordSession(
        email: mailController.text,
        password: passwordController.text,
      );
      // ignore: avoid_print
      print('Login result: $result');
      final user = await _account.value!.get();
      _logedInUser.value = user;
      clearFields();
      goToInput(user);
      Get.snackbar(
        'Erfolg',
        'Anmeldung erfolgreich ${user.name}, ID: ${user.$id}',
        snackPosition: SnackPosition.BOTTOM,
      );
    } on AppwriteException catch (e) {
      final msg = (e.message == null || e.message!.isEmpty)
          ? 'Verbindungsfehler. Prüfe Zertifikat/Endpoint.'
          : e.message!;
      Get.snackbar(
        'Login fehlgeschlagen',
        msg,
        snackPosition: SnackPosition.BOTTOM,
        duration: const Duration(seconds: 5),
      );
    } catch (e) {
      Get.snackbar(
        'Login fehlgeschlagen',
        e.toString(),
        snackPosition: SnackPosition.BOTTOM,
        duration: const Duration(seconds: 5),
      );
    }
  }

  clearFields() {
    try {
      if (_isControllerValid(mailController)) mailController.clear();
      if (_isControllerValid(passwordController)) passwordController.clear();
      if (_isControllerValid(nameController)) nameController.clear();
    } catch (e) {
      // Ignore dispose errors beim Clearing
    }
  }

  Future<void> register() async {
    try {
      // Sichere Controller-Zugriffe
      if (!_isControllerValid(mailController) || 
          !_isControllerValid(passwordController) || 
          !_isControllerValid(nameController)) {
        Get.snackbar(
          'Fehler',
          'Formular nicht verfügbar. Bitte laden Sie die Seite neu.',
          snackPosition: SnackPosition.BOTTOM,
          backgroundColor: Colors.red.shade500,
        );
        return;
      }

      await _account.value!.create(
        userId: ID.unique(),
        email: mailController.text,
        password: passwordController.text,
        name: nameController.text,
      );
      await login();
    } on AppwriteException catch (e) {
      final msg = (e.message == null || e.message!.isEmpty)
          ? 'Registrierung fehlgeschlagen. Prüfe Verbindung.'
          : e.message!;
      Get.snackbar(
        'Registrierung fehlgeschlagen',
        msg,
        snackPosition: SnackPosition.BOTTOM,
        duration: const Duration(seconds: 5),
      );
    } catch (e) {
      Get.snackbar(
        'Registrierung fehlgeschlagen',
        e.toString(),
        snackPosition: SnackPosition.BOTTOM,
        duration: const Duration(seconds: 5),
      );
    }
  }

  Future<void> logout() async {
    try {
      await _account.value!.deleteSession(sessionId: 'current');
      _logedInUser.value = null;
      
      // Erfolgsmeldung nur wenn noch nicht navigiert wurde
      if (Get.currentRoute != '/login') {
        Get.snackbar(
          'Erfolg',
          'Logout erfolgreich',
          snackPosition: SnackPosition.BOTTOM,
          backgroundColor: Colors.green.shade500,
        );
      }
    } catch (e) {
      if (Get.currentRoute != '/login') {
        Get.snackbar(
          'Meldung',
          'Keine aktive Sitzung zum Abmelden',
          snackPosition: SnackPosition.BOTTOM,
          backgroundColor: Colors.orange.shade500,
        );
      }
      debugPrint('Logout error: $e');
    }
  }

  @override
  void onClose() {
    mailController.dispose();
    passwordController.dispose();
    nameController.dispose();
    super.onClose();
  }

  void goToInput(Object args) {
    AppNavigation.toInputPageWithArgs(args);
  }
}