huacu_mobile/lib/main.dart

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:socket_io_client/socket_io_client.dart' as io;

final darkTheme = ThemeData(
  useMaterial3: true,
  primarySwatch: Colors.amber,
  brightness: Brightness.dark,
);

void main() {
  runApp(GetMaterialApp(
    initialRoute: '/auth',
    title: 'HUACU',
    darkTheme: darkTheme,
    themeMode: ThemeMode.dark,
    defaultTransition: Transition.native,
    getPages: [
      GetPage(name: '/auth', page: () => const AuthPage()),
      GetPage(name: '/home', page: () => const HomePage()),
    ],
  ));
}

class AuthData {
  final String login;
  final String password;

  const AuthData(this.login, this.password);
}

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

  @override
  State<AuthPage> createState() => _AuthPageState();
}

class _AuthPageState extends State<AuthPage> {
  final wsUrl = Uri.parse("ws://localhost:9800/ws");
  late io.Socket socket;

  TextEditingController loginController = TextEditingController();
  TextEditingController passwordController = TextEditingController();

  @override
  void initState() {
    super.initState();
    socket = io.io("http://localhost:9800/", <String, dynamic>{
      "transports": ["websocket"],
    });
  }

  @override
  Widget build(BuildContext context) {
    final size = MediaQuery.of(context).size;
    double? formWidth = size.width * 0.5;
    if (formWidth < 300) {
      formWidth = null;
    }

    return Scaffold(
      body: Center(
        child: Container(
          width: formWidth,
          padding: const EdgeInsets.all(16),
          child: FocusTraversalGroup(
            policy: OrderedTraversalPolicy(),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              mainAxisSize: MainAxisSize.min,
              children: [
                Text("HUACU", style: Theme.of(context).textTheme.headline1),
                const SizedBox(height: 32),
                TextField(
                  controller: loginController,
                  decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: "Login",
                  ),
                ),
                const SizedBox(height: 16),
                TextField(
                  controller: passwordController,
                  decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: "Password",
                  ),
                ),
                const SizedBox(height: 16),
                Row(
                  mainAxisSize: MainAxisSize.max,
                  mainAxisAlignment: MainAxisAlignment.end,
                  children: [
                    ElevatedButton(
                      onPressed: _handleLoginClick,
                      child: const Text("Login"),
                    ),
                    const SizedBox(width: 16),
                    ElevatedButton(
                      onPressed: _handleRegistrationClick,
                      child: const Text("Register"),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  void _loginEventHandler(dynamic data) {
    try {
      bool ok = data[0];
      String message = data[1];
      Get.snackbar(
        ok ? "Login successful" : "Login unsuccessful",
        message,
      );
      if (ok) {
        Get.put(AuthData(loginController.text, passwordController.text));
        Get.put(socket);
        Get.offNamed("/home");
      }
    } catch (e) {
      Get.snackbar("Error", e.toString());
    }
    socket.off("login", _loginEventHandler);
  }

  void _handleLoginClick() {
    socket.on("login", _loginEventHandler);
    socket.emit(
      "login",
      [loginController.text, passwordController.text],
    );
  }

  void _registerEventHandler(dynamic data) {
    try {
      bool ok = data[0];
      String message = data[1];
      Get.snackbar(
        ok ? "Registration successful" : "Registration unsuccessful",
        message,
      );
      if (ok) {
        _handleLoginClick();
      }
    } catch (e) {
      Get.snackbar("Error", e.toString());
    }
    socket.off("register", _registerEventHandler);
  }

  void _handleRegistrationClick() {
    socket.on("register", _registerEventHandler);
    socket.emit(
      "register",
      [loginController.text, passwordController.text],
    );
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  late io.Socket socket;

  @override
  void initState() {
    super.initState();
    socket = Get.find();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("HUACU"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text("Hello, ${Get.find<AuthData>().login}"),
          ],
        ),
      ),
    );
  }
}