backend: separate App and server, add websocket endpoint, accept data directory command argument. initialize sqlalchemy database and models in new module. frontend: create backend class for managing ws connection, move ui to chat_screen, create scaffold chat and agent classes.
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Shivering Ocelot committed
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@@ -0,0 +1,9 @@
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import 'chat.dart';
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class Agent {
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void receivedChatMessage(Chat chat, String message) {
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// Simple response from the agent
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String responseMessage = "Agent received: " + message;
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chat.addAgentMessage(responseMessage);
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}
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}
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@@ -0,0 +1,49 @@
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import 'dart:html';
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import 'dart:convert';
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class Backend {
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static WebSocket? _socket;
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static String? _url;
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static void setup(String url) {
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_url = url;
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connect();
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}
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static void auth(username) {
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_socket!.send(
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json.encode({'username': username})
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);
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}
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static void connect() {
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_socket = WebSocket(_url!);
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_socket!.onOpen.listen((event) {
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print('Connected to the WebSocket server');
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auth("the-user");
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ping();
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});
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_socket!.onError.listen((event) {
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print('Error: $event');
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_reconnect();
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});
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_socket!.onClose.listen((event) {
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print('Disconnected. Attempting to reconnect...');
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_reconnect();
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});
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}
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static void _reconnect() {
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Future.delayed(Duration(seconds: 5), () {
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connect();
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});
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}
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static void ping() {
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if (_socket != null && _socket!.readyState == WebSocket.OPEN) {
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final data = json.encode({'path': 'ping'});
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_socket!.send(data);
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print('Ping sent: $data');
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}
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}
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}
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@@ -0,0 +1,31 @@
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import 'agent.dart'; // Import the Agent class
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class Message {
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final String content;
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final String sender;
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Message(this.content, this.sender);
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}
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class Chat {
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final String id;
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final List<Message> _messages = [];
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final Agent agent = Agent(); // Create an instance of Agent
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Chat(this.id);
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List<Message> get messages => List.unmodifiable(_messages);
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void addUserMessage(String message) {
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_messages.add(Message(message, 'user'));
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agent.receivedChatMessage(this, message); // Call agent's method
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}
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void addAgentMessage(String message) {
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_messages.add(Message(message, 'agent'));
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}
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void clearMessages() {
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_messages.clear();
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}
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}
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@@ -0,0 +1,80 @@
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import 'package:flutter/material.dart';
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import 'chat.dart'; // Import the new Chat class
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class ChatScreen extends StatefulWidget {
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const ChatScreen({super.key});
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@override
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State<ChatScreen> createState() => _ChatScreenState();
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}
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class _ChatScreenState extends State<ChatScreen> {
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final Chat _chat = Chat('chat1'); // Create an instance of Chat
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final TextEditingController _controller = TextEditingController();
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void _sendMessage() {
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if (_controller.text.isNotEmpty) {
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setState(() {
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_chat.addUserMessage(_controller.text); // Use the Chat instance to add the message
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_controller.clear();
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});
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}
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}
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@override
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Widget build(BuildContext context) {
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final width = MediaQuery.of(context).size.width;
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final isBigScreen = width > 600; // Define threshold for small screens
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return Scaffold(
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appBar: AppBar(
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title: const Text('Chat'),
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),
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body: Column(
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children: [
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Expanded(
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child: ListView.builder(
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itemCount: _chat.messages.length,
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itemBuilder: (context, index) {
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final message = _chat.messages[index];
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// Align all messages to left for big screens
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final align = message.sender == 'user' && !isBigScreen ? CrossAxisAlignment.end : CrossAxisAlignment.start;
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return Row(
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mainAxisAlignment: align == CrossAxisAlignment.end ? MainAxisAlignment.end : MainAxisAlignment.start,
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children: [
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Container(
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padding: const EdgeInsets.all(8.0),
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margin: const EdgeInsets.symmetric(vertical: 4.0),
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child: Text(
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'${message.content}',
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style: const TextStyle(color: Colors.white),
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),
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),
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],
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);
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},
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),
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),
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Padding(
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padding: const EdgeInsets.all(8.0),
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child: Row(
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children: [
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Expanded(
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child: TextField(
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controller: _controller,
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decoration: const InputDecoration(hintText: 'Send a message'),
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onSubmitted: (_) => _sendMessage(),
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),
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),
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IconButton(
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icon: const Icon(Icons.send),
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onPressed: _sendMessage,
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),
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],
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),
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),
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],
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),
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);
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}
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}
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+29
-108
@@ -1,122 +1,43 @@
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import 'dart:html' as html;
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import 'dart:io' as io;
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import 'package:flutter/material.dart';
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import 'chat_screen.dart';
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import 'backend.dart';
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class Config {
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static String? backendUrl; // Declare it as nullable
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static void loadConfig() {
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// Check the platform for web or other
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if (html.window.location.origin.isNotEmpty) {
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// For web applications
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backendUrl = html.window.location.origin; // Get the server URL from window.location
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} else if (io.Platform.environment.containsKey('BACKEND_URL')) {
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// For Android or other platforms, check for the environment variable
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backendUrl = io.Platform.environment['BACKEND_URL'];
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} else {
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// If no value is determined, set it to null
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backendUrl = null;
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}
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}
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}
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void main() {
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Config.loadConfig(); // Load the configuration before running the app
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Backend.setup('${Config.backendUrl}/ws');
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runApp(const MyApp());
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}
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class MyApp extends StatelessWidget {
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const MyApp({super.key});
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Demo',
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theme: ThemeData(
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// This is the theme of your application.
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//
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// TRY THIS: Try running your application with "flutter run". You'll see
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// the application has a purple toolbar. Then, without quitting the app,
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// try changing the seedColor in the colorScheme below to Colors.green
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// and then invoke "hot reload" (save your changes or press the "hot
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// reload" button in a Flutter-supported IDE, or press "r" if you used
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// the command line to start the app).
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//
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// Notice that the counter didn't reset back to zero; the application
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// state is not lost during the reload. To reset the state, use hot
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// restart instead.
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//
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// This works for code too, not just values: Most code changes can be
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// tested with just a hot reload.
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colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
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),
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home: const MyHomePage(title: 'Flutter Demo Home Page'),
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title: 'Flutter Chat',
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theme: ThemeData.dark(),
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home: const ChatScreen(),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({super.key, required this.title});
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// This widget is the home page of your application. It is stateful, meaning
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// that it has a State object (defined below) that contains fields that affect
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// how it looks.
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// This class is the configuration for the state. It holds the values (in this
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// case the title) provided by the parent (in this case the App widget) and
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// used by the build method of the State. Fields in a Widget subclass are
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// always marked "final".
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final String title;
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@override
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State<MyHomePage> createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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int _counter = 0;
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void _incrementCounter() {
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setState(() {
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// This call to setState tells the Flutter framework that something has
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// changed in this State, which causes it to rerun the build method below
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// so that the display can reflect the updated values. If we changed
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// _counter without calling setState(), then the build method would not be
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// called again, and so nothing would appear to happen.
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_counter++;
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});
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}
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@override
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Widget build(BuildContext context) {
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// This method is rerun every time setState is called, for instance as done
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// by the _incrementCounter method above.
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//
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// The Flutter framework has been optimized to make rerunning build methods
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// fast, so that you can just rebuild anything that needs updating rather
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// than having to individually change instances of widgets.
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return Scaffold(
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appBar: AppBar(
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// TRY THIS: Try changing the color here to a specific color (to
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// Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
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// change color while the other colors stay the same.
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backgroundColor: Theme.of(context).colorScheme.inversePrimary,
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// Here we take the value from the MyHomePage object that was created by
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// the App.build method, and use it to set our appbar title.
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title: Text(widget.title),
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),
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body: Center(
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// Center is a layout widget. It takes a single child and positions it
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// in the middle of the parent.
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child: Column(
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// Column is also a layout widget. It takes a list of children and
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// arranges them vertically. By default, it sizes itself to fit its
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// children horizontally, and tries to be as tall as its parent.
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//
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// Column has various properties to control how it sizes itself and
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// how it positions its children. Here we use mainAxisAlignment to
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// center the children vertically; the main axis here is the vertical
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// axis because Columns are vertical (the cross axis would be
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// horizontal).
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//
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// TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
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// action in the IDE, or press "p" in the console), to see the
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// wireframe for each widget.
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const Text('You have pushed the button this many times:'),
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Text(
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'$_counter',
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style: Theme.of(context).textTheme.headlineMedium,
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),
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],
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),
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),
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floatingActionButton: FloatingActionButton(
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onPressed: _incrementCounter,
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tooltip: 'Increment',
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child: const Icon(Icons.add),
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), // This trailing comma makes auto-formatting nicer for build methods.
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);
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}
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}
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}
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