Complete the project

a.txt

@@ -0,0 +1,4 @@
+hiiiiiiiiiiiiii
+how are youuuuuuuuuu
+long time no seeeeeeeeeee
+:(

src/main/java/com/university/chat/Client/ServerListener.java

@@ -1,19 +1,50 @@
 package com.university.chat.Client;
 
-public class ServerListener implements Runnable{
+import com.university.chat.Common.ChatMessage;
-    // TODO: store the ObjectInputStream from the user socket
+import com.university.chat.Common.FileMessage;
-    //          (this should be the same input stream the
+import com.university.chat.Common.MessageType;
-    //           chatClient created when connecting)
+
+import java.io.ObjectInputStream;
+
+public class ServerListener implements Runnable
+{
+    private ObjectInputStream in;
+    public ServerListener(ObjectInputStream in)
+    {
+        this.in = in;
+    }
 
     @Override
-    public void run() {
+    public void run()
+    {
         try {
-            // TODO: In an infinite loop read objects from the server
+            while (true) {
-            //   - if it's a ChatMessage  -> print "<sender>: <content>"
+                Object object = in.readObject();
-            //   - if it's a FileMessage  -> print that a file was received
+
-            //                               (filename + sender), it's already
+                if (object instanceof ChatMessage)
-            //                               saved to disk by the server.
+                {
-        } catch (Exception e){
+                    ChatMessage msg = (ChatMessage) object;
+
+                    if (msg.getType() == MessageType.LOGIN_SUCCESS || msg.getType() == MessageType.LOGIN_FAILED)
+                    {
+                        System.out.println("\n" + msg.getContent());
+                    }
+                    else
+                    {
+                        System.out.println("\n" + msg.getSender() + ": " + msg.getContent());
+                    }
+
+                }
+                else if (object instanceof FileMessage)
+                {
+                    FileMessage fileMsg = (FileMessage) object;
+                    System.out.println("\n[FILE RECEIVED] From: " + fileMsg.getSender() + " | Name: " + fileMsg.getFilename());
+                    System.out.print("> ");
+                }
+            }
+        }
+        catch (Exception e)
+        {
             System.out.println("Disconnected from server");
         }
     }

src/main/java/com/university/chat/Client/chatClient.java

@@ -1,29 +1,138 @@
 package com.university.chat.Client;
 
-public class chatClient {
+import com.university.chat.Common.ChatMessage;
-    public static void main() {
+import com.university.chat.Common.FileMessage;
-        // TODO: Connecting to the server
+import com.university.chat.Common.MessageType;
-        //  1. Create a socket and connect to the server
-        //  2. Create an ObjectOutputStream (out) and ObjectInputStream (in)
-        //      from the socket's streams — output FIRST, then input.
-        //  2. Get the username, and send a LOGIN ChatMessage with that username
-        //  3. Start a new Thread running a ServerListener(in) so incoming
-        //      messages are handled concurrently.
 
-        while (true){
+import java.io.*;
-            try {
+import java.net.Socket;
-                // TODO: Program loop — read a line from the console and act on it:
+import java.net.UnknownHostException;
-                //   - "/msg <user> <text>"        -> build & send a PRIVATE_MESSAGE
+import java.util.Scanner;
-                //   - "/users"                    -> build & send a USER_LIST request
+
-                //   - "/sendfile <user> <path>"   -> read the file into a byte[]
+public class chatClient
-                //                                     (you can use TransferProgress
+{
-                //                                     to show progress)
+    private static Socket socket;
-                //                                     and send it as a FileMessage
+    private static ObjectOutputStream out;
-                //   - anything else               -> send a PUBLIC_MESSAGE
+    private static ObjectInputStream in;
-                //   Remember to flush() the output stream after writeObject().
+    private static String username;
-            } catch (Exception e){
+
-                System.out.println("command failed: " + e.getMessage());
+    public static void main()
+    {
+        Scanner scanner = new Scanner(System.in);
+
+        try
+        {
+            socket = new Socket("localhost", 5000);
+            out = new ObjectOutputStream(socket.getOutputStream());
+            in = new ObjectInputStream(socket.getInputStream());
+
+            System.out.print("Enter your username: ");
+            username = scanner.nextLine();
+
+            ChatMessage loginMsg = new ChatMessage(MessageType.LOGIN, username, null, "");
+            out.writeObject(loginMsg);
+            out.flush();
+
+            ServerListener listener = new ServerListener(in);
+            Thread thread = new Thread(listener);
+            thread.start();
+
+            System.out.println("Connected!");
+
+            while (true)
+            {
+                try
+                {
+                    String input = scanner.nextLine();
+
+                    if (input.startsWith("/msg "))
+                    {
+                        String[] parts = input.split(" ", 3);
+                        if (parts.length >= 3)
+                        {
+                            String receiver = parts[1];
+                            String content = parts[2];
+                            ChatMessage msg = new ChatMessage(MessageType.PRIVATE_MESSAGE, username, receiver, content);
+                            out.writeObject(msg);
+                            out.flush();
+                        }
+                        else
+                        {
+                            System.out.println("Usage: /msg <username> <message>");
+                        }
+
+                    }
+                    else if (input.trim().equals("/users"))
+                    {
+                        ChatMessage req = new ChatMessage(MessageType.USER_LIST, username, null, "");
+                        out.writeObject(req);
+                        out.flush();
+
+                    }
+                    else if (input.startsWith("/sendfile "))
+                    {
+                        String[] parts = input.split(" ", 3);
+                        if (parts.length >= 3)
+                        {
+                            String receiver = parts[1];
+                            String filePath = parts[2];
+                            sendFile(receiver, filePath);
+                        }
+                        else
+                        {
+                            System.out.println("Usage: /sendfile <username> <filepath>");
+                        }
+
+                    }
+                    else
+                    {
+                        if (!input.isEmpty())
+                        {
+                            ChatMessage msg = new ChatMessage(MessageType.PUBLIC_MESSAGE, username, null, input);
+                            out.writeObject(msg);
+                            out.flush();
+                        }
+                    }
+                }
+                catch (Exception e)
+                {
+                    System.out.println("command failed: " + e.getMessage());
+                }
             }
         }
+        catch (UnknownHostException e)
+        {
+            throw new RuntimeException(e);
+        }
+        catch (IOException e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static void sendFile(String receiver, String filePath) throws IOException
+    {
+        File file = new File(filePath);
+        if (!file.exists())
+        {
+            System.out.println("file not found : " + filePath);
+            return;
+        }
+
+        long fileSize = file.length();
+        byte[] data = new byte[(int) fileSize];
+
+        try (FileInputStream fis = new FileInputStream(file))
+        {
+            fis.read(data);
+        }
+
+        TransferProgress progress = new TransferProgress(fileSize);
+        progress.update(fileSize);
+
+        FileMessage fileMsg = new FileMessage(username, receiver, file.getName(), data);
+        out.writeObject(fileMsg);
+        out.flush();
+        System.out.println("Send file : " + file.getName());
     }
 }

src/main/java/com/university/chat/Server/ChatServer.java

@@ -1,15 +1,28 @@
 package com.university.chat.Server;
 
-public class ChatServer {
+import java.net.ServerSocket;
-    // TODO: declare a single shared UserManager instance (static final)
+import java.net.Socket;
-    //         This MUST be shared by all ClientSession threads so that
-    //         broadcasting and private messaging work correctly.
 
-    public static void main(String[] args) {
+public class ChatServer
-        // TODO: Create a ServerSocket
+{
+    private static final UserManager userManager = new UserManager();
 
-        // TODO: In an infinite loop:
+    public static void main(String[] args)
-        //  accept an incoming client connection
+    {
-        //  make a new thread running ClientSession for each user.
+        try (ServerSocket serverSocket = new ServerSocket(5000))
+        {
+            System.out.println("Server connected");
+            while (true)
+            {
+                Socket clientSocket = serverSocket.accept();
+                ClientSession clientSession = new ClientSession(clientSocket, userManager);
+                Thread thread = new Thread(clientSession);
+                thread.start();
+            }
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
     }
 }

src/main/java/com/university/chat/Server/ClientSession.java

@@ -2,44 +2,110 @@ package com.university.chat.Server;
 
 import com.university.chat.Common.ChatMessage;
 import com.university.chat.Common.FileMessage;
+import com.university.chat.Common.MessageType;
 
 import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import java.net.Socket;
 import java.nio.file.Files;
 
 public class ClientSession implements Runnable {
 
     private String username;
+    private Socket socket;
+    private ObjectInputStream in;
+    private ObjectOutputStream out;
+    private UserManager userManager;
 
-    public ClientSession(Socket socket, UserManager userManager) {
+    public ClientSession(Socket socket, UserManager userManager)
-        // TODO : Create an ObjectOutputStream from socket.getOutputStream()
+    {
-        //         and an ObjectInputStream from socket.getInputStream().
+        this.socket = socket;
+        this.userManager = userManager;
+
+        try
+        {
+            this.in = new ObjectInputStream(socket.getInputStream());
+            this.out = new ObjectOutputStream(socket.getOutputStream());
+        }
+        catch (IOException e)
+        {
+            System.err.println("Error creating streams: " + e.getMessage());
+            try
+            {
+                socket.close();
+            }
+            catch (IOException ex)
+            {
+                ex.printStackTrace();
+            }
+        }
     }
 
     @Override
-    public void run() {
+    public void run()
-        try {
+    {
+        try
+        {
+            Object object = in.readObject();
 
-            // TODO: Welcome the user (login step)
+            if (object instanceof ChatMessage)
-            //  1. Read the first object sent by the client.
+            {
-            //  2. Check it's a ChatMessage with type LOGIN.
+                ChatMessage loginMsg = (ChatMessage) object;
-            //  3. Extract the username.
-            //  4. Try to register the user via userManager.addUser(...).
-            //  5. If the username is taken, send back LOGIN_FAILED and close the socket.
-            //  6. Otherwise, create the user's folders with FileManager.createUserFolders(...)
-            //      and send back LOGIN_SUCCESS.
 
-            // TODO: Main message loop
+                if (loginMsg.getType() == MessageType.LOGIN)
-            //   In a loop, call in.readObject(), you can separate messages by their type:
+                {
-            //     - if it's a ChatMessage      -> call handleChatMessage(msg)
+                    this.username = loginMsg.getSender();
-            //     - if it's a FileMessage      -> call handleFileMessage(fileMsg)
-            //   Keep looping until the connection is closed (an exception will be thrown).
 
-        } catch (Exception e) {
+                    if (userManager.addUser(username, this))
+                    {
+                        ChatMessage successMsg = new ChatMessage(MessageType.LOGIN_SUCCESS, "System", username, "Welcome " + username);
+                        out.writeObject(successMsg);
+                        out.flush();
+
+                        FileManager.createUserFolders(username);
+                        System.out.println("User logged in: " + username);
+                    }
+                    else
+                    {
+                        ChatMessage failMsg = new ChatMessage(MessageType.LOGIN_FAILED, "System", username, "Username already taken");
+                        out.writeObject(failMsg);
+                        out.flush();
+
+                        socket.close();
+                        return;
+                    }
+                }
+            }
+
+            while (!socket.isClosed())
+            {
+                Object message = in.readObject();
+
+                if (message instanceof  ChatMessage) handleChatMessage((ChatMessage) message);
+                else if (message instanceof FileMessage) handleFileMessage ((FileMessage) message);
+            }
+        }
+        catch (Exception e)
+        {
             System.out.println("Disconnected: " + username);
-        } finally {
+        }
-            // TODO: Remove the user from UserManager so they no longer
+        finally
-            //        receive broadcasts or appear in users list
+        {
+            if (username != null)
+            {
+                userManager.removeUser(username);
+                System.out.println("User removed: " + username);
+            }
+
+            try
+            {
+                socket.close();
+            }
+            catch (IOException e)
+            {
+                e.printStackTrace();
+            }
         }
     }
 
@@ -47,13 +113,31 @@ public class ClientSession implements Runnable {
     private void handleChatMessage(ChatMessage msg) throws IOException {
         switch (msg.getType()) {
             case PUBLIC_MESSAGE -> {
-                // TODO: Broadcast this message to every connected client.
+                for (ClientSession session : userManager.getAllSessions())
+                {
+                    session.out.writeObject(msg);
+                    session.out.flush();
+                }
             }
             case PRIVATE_MESSAGE -> {
-                // TODO: Forward this message to the receiver user.
+                ClientSession recieverSession = userManager.getUser(msg.getReceiver());
+                if (recieverSession != null)
+                {
+                    recieverSession.out.writeObject(msg);
+                    recieverSession.out.flush();
+                }
+                else
+                {
+                    ChatMessage errorReply = new ChatMessage(MessageType.PRIVATE_MESSAGE, "System", msg.getSender(), "User " + msg.getReceiver() + " is not online.");
+                    out.writeObject(errorReply);
+                    out.flush();
+                }
             }
             case USER_LIST -> {
-                // TODO: Reply to the requester with the list of online users.
+                String userList = userManager.listUsers();
+                ChatMessage listMsg = new ChatMessage(MessageType.USER_LIST, "system", username, userList);
+                out.writeObject(listMsg);
+                out.flush();
             }
         }
     }
@@ -66,6 +150,11 @@ public class ClientSession implements Runnable {
         Files.write(sentPath, fileMsg.getData());
         Files.write(recvPath, fileMsg.getData());
 
-        // TODO: Forward the received file-message to the destination user.
+       ClientSession recieverSession = userManager.getUser(fileMsg.getReceiver());
+       if (recieverSession != null)
+       {
+           recieverSession.out.writeObject(fileMsg);
+           recieverSession.out.flush();
+       }
     }
 }