Merge pull request 'network' (#1) from develop into main

Reviewed-on: neda/WS-10-Network#1
Reviewed-by: Hosein Asfiaee

.idea/misc.xml

@@ -8,5 +8,5 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" project-jdk-name="21" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_26" project-jdk-name="26" project-jdk-type="JavaSDK" />
 </project>

src/main/java/chat/ChatClient.java

@@ -37,19 +37,26 @@ public class ChatClient {
     }
 
     private void connectToServer() throws IOException {
-        // TODO: create socket connection to host:port
-        // TODO: initialize output stream (PrintWriter)
-        // TODO: initialize input stream (BufferedReader)
+        socket = new Socket(host, port);
+        out = new PrintWriter(socket.getOutputStream(), true);
+        in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
     }
 
     private void readUserInputAndSend() throws IOException {
-        // TODO: read continuously from console
-        // TODO: send each input line to server
+        String input;
+        while ((input = consoleReader.readLine()) != null) {
+            out.println(input);
+        }
     }
 
     private void cleanup() {
-        // TODO: close socket safely
-        // TODO: release resources
+        try {
+            if (socket != null && !socket.isClosed()) {
+                socket.close();
+            }
+        } catch (IOException e) {
+            System.err.println("Error closing socket: " + e.getMessage());
+        }
     }
 
     public static void main(String[] args) {

src/main/java/chat/ChatServer.java

@@ -39,20 +39,26 @@ public class ChatServer {
     }
 
     public void broadcast(String message, ClientHandler sender) {
-        // step 1: iterate through connectedClients safely
-        // step 2: skip the sender client
-        // step 3: send message to remaining clients using sendMessage
+        synchronized (connectedClients) {
+            for (ClientHandler client : connectedClients) {
+                if (client != sender) {
+                    client.sendMessage(message);
+                }
+            }
+        }
     }
 
     public void broadcastSystemMessage(String message) {
-        // step 1: iterate through all connected clients
-        // step 2: send system message to each client
+        synchronized (connectedClients) {
+            for (ClientHandler client : connectedClients) {
+                client.sendMessage(message);
+            }
+        }
     }
 
     public void removeClient(ClientHandler clientHandler) {
-        // step 1: remove client from connectedClients set
-        // step 2: retrieve username from clientHandler
-        // step 3: broadcast system message about user leaving
+        connectedClients.remove(clientHandler);
+        broadcastSystemMessage("[System] " + clientHandler.getUsername() + " left the chat.");
     }
 
     public static void main(String[] args) {

src/main/java/chat/MessageListener.java

@@ -13,7 +13,13 @@ public class MessageListener implements Runnable {
 
     @Override
     public void run() {
-        // TODO: continuously read messages from server
-        // TODO: print received messages immediately
+        try {
+            String message;
+            while ((message = inputReader.readLine()) != null) {
+                System.out.println(message);
+            }
+        } catch (IOException e) {
+            System.err.println("Connection lost: " + e.getMessage());
+        }
     }
 }