eatvio_app/lib/features/auth/auth_screen/auth_screen.dart

import 'dart:convert';
import 'package:eatvio_app/core/const.dart';
import 'package:eatvio_app/core/credentials_storage.dart';
import 'package:eatvio_app/core/locator_service.dart';
import 'package:eatvio_app/core/token_storage.dart';
import 'package:eatvio_app/features/auth/const/strings.dart';
import 'package:eatvio_app/features/bottom_navigation_bar/presentation/bloc/profile_avatar_cubit/profile_avatar_cubit.dart';
import 'package:flutter/material.dart';
import 'package:flutter_native_splash/flutter_native_splash.dart';
import 'package:go_router/go_router.dart';
import 'package:http/http.dart' as http;
import 'package:webview_flutter/webview_flutter.dart';

class AuthScreen extends StatefulWidget {
  final bool needLogout;

  const AuthScreen({
    this.needLogout = false,
  });

  @override
  State<AuthScreen> createState() => _AuthScreenState();
}

class _AuthScreenState extends State<AuthScreen> {
  bool checkboxState = false;
  bool hidePassword = true;
  final baseUrlController = TextEditingController();
  late final WebViewController _controller;

  String email = '';
  String password = '';

  Future<void> logout() async {
    await CredentialsStorage.removeCredentials();
    await _controller.runJavaScript('''
      document.querySelector('.header-list__link button[type="submit"]').click();
    ''');
  }

  @override
  void initState() {
    super.initState();

    _controller = WebViewController()
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..addJavaScriptChannel(
        'FlutterChannel',
        onMessageReceived: (JavaScriptMessage message) {
          final data = jsonDecode(message.message);
          email = data['email'];
          password = data['password'];
        },
      )
      ..setNavigationDelegate(
        NavigationDelegate(
          onNavigationRequest: (NavigationRequest navigationRequest) async {
            if (navigationRequest.url.contains('profile')) {
              if (await CredentialsStorage.haveCredentialsInStorage()) {
                email = (await CredentialsStorage.getCredentialsFromStorage())['email']!;
                password = (await CredentialsStorage.getCredentialsFromStorage())['password']!;
              } else {
                if (email.isNotEmpty && password.isNotEmpty && !(await TokenStorage.haveTokenInStorage())) {
                  await CredentialsStorage.saveCredentials(email, password);
                  try {
                    final Map<String, String> credentials = {
                      'email': email,
                      'password': password,
                    };
                    final response = await http.post(
                      Uri.parse(baseUrl + '/api/login'),
                      headers: {'Content-Type': 'application/json'},
                      body: json.encode(credentials),
                      encoding: utf8,
                    );
                    var res = await jsonDecode(response.body);
                    final token = res['token'];
                    await TokenStorage.saveTokenInStorage(token);
                    GoRouter.of(context).go('/my-profile-screen');
                    await sl<ProfileAvatarCubit>().getMyProfile();
                  } catch (e) {
                    print(e);
                  }
                } else {
                  await logout();
                }
              }
            }
            return NavigationDecision.navigate;
          },
          onPageStarted: (String url) async {
            final bool tokenInStorage = await TokenStorage.haveTokenInStorage();
            final bool credentialsInStorage = await CredentialsStorage.haveCredentialsInStorage();
            if (tokenInStorage && credentialsInStorage) {
              GoRouter.of(context).go('/my-profile-screen');
            } else if (!tokenInStorage && credentialsInStorage) {
              final credentialsFromStorage = await CredentialsStorage.getCredentialsFromStorage();
              final Map<String, String> credentials = {
                'email': credentialsFromStorage['email']!,
                'password': credentialsFromStorage['password']!,
              };
              final response = await http.post(
                Uri.parse(baseUrl + '/api/login'),
                headers: {'Content-Type': 'application/json'},
                body: json.encode(credentials),
                encoding: utf8,
              );
              var res = await jsonDecode(response.body);
              final token = res['token'];
              await TokenStorage.saveTokenInStorage(token);
              GoRouter.of(context).go('/my-profile-screen');
              await sl<ProfileAvatarCubit>().getMyProfile();
            }
          },
          onPageFinished: (String url) async {
            await _controller.runJavaScript(jsChannelAuthScript);
          },
        ),
      )
      ..loadRequest(Uri.parse(baseUrl));
  }

  @override
  Widget build(BuildContext context) {
    FlutterNativeSplash.remove();
    return Scaffold(
      appBar: AppBar(
        toolbarHeight: 0,
      ),
      body: SafeArea(
        child: WebViewWidget(controller: _controller),
      ),
    );
  }
}