[update] Remove unused Times New Roman font dependency from pom.xml. Enhance Client and ClientHandler classes with improved network resilience features, including IdleStateHandler for better timeout management and user-friendly error dialogs for connection issues. Update Server class to include IdleStateHandler for improved tolerance of network delays.

pom.xml

@@ -246,12 +246,5 @@
             <artifactId>sqlite-jdbc</artifactId>
             <version>3.45.1.0</version>
         </dependency>
-        <dependency>
-    <groupId>com.yourcompany</groupId>
-    <artifactId>jasper-fonts-timesnewroman</artifactId>
-    <version>1.0</version>
-    <scope>system</scope>
-    <systemPath>${project.basedir}/src/main/resources/fonts/timesnewroman-fonts.jar</systemPath>
-</dependency>
     </dependencies>
 </project>

src/main/java/BsK/client/Client.java

@@ -13,6 +13,7 @@ import io.netty.handler.codec.http.HttpClientCodec;
 import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.websocketx.WebSocketClientProtocolHandler;
 import io.netty.handler.codec.http.websocketx.WebSocketVersion;
+import io.netty.handler.timeout.IdleStateHandler;
 import java.net.URI;
 import java.net.URISyntaxException;
 import lombok.extern.slf4j.Slf4j;
@@ -45,11 +46,13 @@ public class Client {
                 1. Máy chủ chưa được khởi động
                 2. Địa chỉ hoặc cổng không chính xác
                 3. Tường lửa đang chặn kết nối
+                4. Mạng internet/WiFi bị ngắt kết nối
                 
                 Giải pháp:
-                1. Kiểm tra xem máy chủ đã được khởi động chưa
-                2. Kiểm tra lại cấu hình trong file config.properties
-                3. Tắt ứng dụng và khởi động lại
+                1. Kiểm tra kết nối internet/WiFi
+                2. Kiểm tra xem máy chủ đã được khởi động chưa
+                3. Kiểm tra lại cấu hình trong file config.properties
+                4. Tắt ứng dụng và khởi động lại
                 
                 Chi tiết lỗi: %s
                 """,
@@ -186,16 +189,37 @@ public class Client {
                                                                         true,
                                                                         new DefaultHttpHeaders(),
                                                                         50  * 1024 * 1024))
+                                                        // Add IdleStateHandler with longer timeouts for network resilience
+                                                        // Read timeout: 60 seconds, Write timeout: 30 seconds  
+                                                        .addLast(new IdleStateHandler(60, 30, 0))
                                                         .addLast("ws", ClientHandler.INSTANCE);
                                             }
                                         });
                 log.info("Connecting to {}:{}", serverAddress, 1999);
                 Channel channel = bootstrap.connect(serverAddress, 1999).sync().channel();
+                
+                // Store the channel for potential reconnection
+                ClientHandler.ctx = channel.pipeline().get(ClientHandler.class).ctx;
+                
+                // Wait for channel to close, but handle it gracefully
                 channel.closeFuture().sync();
 
             } catch (Exception e) {
                 log.error("Connection error", e);
-                showConnectionErrorDialog(serverAddress, 1999, e);
+                
+                // Show more specific error message for different types of connection failures
+                if (e instanceof java.net.ConnectException) {
+                    showConnectionErrorDialog(serverAddress, 1999, 
+                        new Exception("Không thể kết nối đến máy chủ. Máy chủ có thể chưa được khởi động hoặc địa chỉ/cổng không đúng."));
+                } else if (e instanceof java.net.UnknownHostException) {
+                    showConnectionErrorDialog(serverAddress, 1999, 
+                        new Exception("Không tìm thấy máy chủ. Kiểm tra lại địa chỉ máy chủ và kết nối mạng."));
+                } else if (e instanceof java.net.SocketTimeoutException) {
+                    showConnectionErrorDialog(serverAddress, 1999, 
+                        new Exception("Hết thời gian chờ kết nối. Kiểm tra kết nối mạng và thử lại."));
+                } else {
+                    showConnectionErrorDialog(serverAddress, 1999, e);
+                }
                 return;
             } finally {
                 try {

src/main/java/BsK/client/network/handler/ClientHandler.java

@@ -13,10 +13,13 @@ import io.netty.handler.codec.http.websocketx.*;
 import io.netty.handler.timeout.IdleState;
 import io.netty.handler.timeout.IdleStateEvent;
 import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import javax.swing.JOptionPane;
+import javax.swing.SwingUtilities;
 
 import lombok.extern.slf4j.Slf4j;
 
@@ -25,6 +28,12 @@ public class ClientHandler extends SimpleChannelInboundHandler<TextWebSocketFram
   public static ChannelHandlerContext ctx;
   public static TextWebSocketFrame frame;
   public static final ClientHandler INSTANCE = new ClientHandler();
+  
+  // Network resilience tracking
+  private static volatile boolean internetIssueDialogShown = false;
+  private static volatile long lastNetworkIssueTime = 0;
+  private static final long NETWORK_ISSUE_DIALOG_COOLDOWN = 30000; // 30 seconds
+  private static volatile boolean dialogCurrentlyShowing = false;
 
   private static final Map<Class<?>, List<ResponseListener<?>>> listeners = new ConcurrentHashMap<>();
 
@@ -113,6 +122,14 @@ public class ClientHandler extends SimpleChannelInboundHandler<TextWebSocketFram
     if (evt instanceof IdleStateEvent) {
       IdleStateEvent event = (IdleStateEvent) evt;
       if (event.state() == IdleState.WRITER_IDLE) {
+        // Send ping to keep connection alive
+        log.debug("Sending ping to server");
+        ctx.writeAndFlush(new PingWebSocketFrame());
+      } else if (event.state() == IdleState.READER_IDLE) {
+        // Server hasn't responded in a while - show internet issue dialog but don't close immediately
+        log.warn("Server not responding - possible network issues");
+        showInternetIssueDialog();
+        // Try to send a ping to test connection
         ctx.writeAndFlush(new PingWebSocketFrame());
       }
     }
@@ -120,12 +137,213 @@ public class ClientHandler extends SimpleChannelInboundHandler<TextWebSocketFram
 
   @Override
   public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
-    if (cause instanceof IOException) {
-      log.error("Connection closed");
+    log.error("Connection exception: {}", cause.getMessage());
+    
+    // Check if it's a network-related exception that might be temporary
+    if (cause instanceof IOException || 
+        cause instanceof java.nio.channels.ClosedChannelException ||
+        cause instanceof java.net.SocketException) {
+      
+      // Show internet issue dialog instead of immediately closing
+      showInternetIssueDialogBlocking();
+      
+      // Only close after multiple failures or if explicitly requested
+      log.warn("Network exception occurred, showing warning dialog");
+    } else {
+      // For other exceptions, show the connection lost dialog and exit
+      showConnectionLostDialog();
       System.exit(0);
     }
   }
 
+  @Override
+  public void channelInactive(ChannelHandlerContext ctx) throws Exception {
+    log.warn("Channel became inactive - connection lost");
+    
+    // Show internet issue dialog and give it time to display
+    showInternetIssueDialogBlocking();
+    
+    // Add a small delay to ensure dialog shows before channel cleanup
+    try {
+      Thread.sleep(1000);
+    } catch (InterruptedException e) {
+      Thread.currentThread().interrupt();
+    }
+    
+    super.channelInactive(ctx);
+    // The dialog will handle the exit decision
+  }
+
+  private void showInternetIssueDialog() {
+    long currentTime = System.currentTimeMillis();
+    
+    // Only show dialog if cooldown period has passed to avoid spam
+    if (internetIssueDialogShown && (currentTime - lastNetworkIssueTime) < NETWORK_ISSUE_DIALOG_COOLDOWN) {
+      return;
+    }
+    
+    internetIssueDialogShown = true;
+    lastNetworkIssueTime = currentTime;
+    
+    SwingUtilities.invokeLater(() -> {
+      String message = """
+          Phát hiện vấn đề kết nối mạng!
+          
+          Tình trạng:
+          • Mạng internet chậm hoặc không ổn định
+          • Một số yêu cầu có thể bị trễ hoặc thất bại
+          • Ứng dụng sẽ tiếp tục hoạt động nhưng có thể chậm
+          
+          Nguyên nhân có thể:
+          1. Kết nối WiFi/Internet không ổn định
+          2. Tốc độ mạng chậm
+          3. Gián đoạn mạng tạm thời
+          
+          Giải pháp:
+          1. Kiểm tra kết nối internet/WiFi
+          2. Thử thao tác lại nếu có lỗi
+          3. Đợi mạng ổn định hơn
+          4. Khởi động lại ứng dụng nếu cần thiết
+          
+          Ứng dụng sẽ tiếp tục hoạt động...
+          """;
+      
+      int option = JOptionPane.showOptionDialog(
+          null,
+          message,
+          "Cảnh Báo - Vấn Đề Mạng",
+          JOptionPane.YES_NO_OPTION,
+          JOptionPane.WARNING_MESSAGE,
+          null,
+          new String[]{"Tiếp Tục", "Đóng Ứng Dụng"},
+          "Tiếp Tục"
+      );
+      
+      if (option == 1) { // User chose to close application
+        System.exit(0);
+      }
+      
+      // Reset the flag after some time to allow showing the dialog again if needed
+      new Thread(() -> {
+        try {
+          Thread.sleep(NETWORK_ISSUE_DIALOG_COOLDOWN);
+          internetIssueDialogShown = false;
+        } catch (InterruptedException e) {
+          Thread.currentThread().interrupt();
+        }
+      }).start();
+    });
+  }
+  
+  private void showInternetIssueDialogBlocking() {
+    long currentTime = System.currentTimeMillis();
+    
+    // Only show dialog if cooldown period has passed to avoid spam
+    if ((internetIssueDialogShown && (currentTime - lastNetworkIssueTime) < NETWORK_ISSUE_DIALOG_COOLDOWN) || dialogCurrentlyShowing) {
+      return;
+    }
+    
+    internetIssueDialogShown = true;
+    dialogCurrentlyShowing = true;
+    lastNetworkIssueTime = currentTime;
+    
+    // Show dialog directly on current thread to ensure it displays before app can exit
+    try {
+      // Force the dialog to show on the EDT and block until it's handled
+      if (SwingUtilities.isEventDispatchThread()) {
+        // If already on EDT, show directly
+        showNetworkIssueDialog();
+      } else {
+        // If on another thread, switch to EDT and wait
+        SwingUtilities.invokeAndWait(this::showNetworkIssueDialog);
+      }
+    } catch (InterruptedException | InvocationTargetException e) {
+      dialogCurrentlyShowing = false;
+      System.err.println("Error showing dialog: " + e.getMessage());
+      // Show a simple message as fallback
+      System.err.println("NETWORK ISSUE DETECTED - Please restart the application");
+    }
+    
+    dialogCurrentlyShowing = false;
+    
+    // Reset the flag after some time to allow showing the dialog again if needed
+    new Thread(() -> {
+      try {
+        Thread.sleep(NETWORK_ISSUE_DIALOG_COOLDOWN);
+        internetIssueDialogShown = false;
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+      }
+    }, "NetworkDialogReset").start();
+  }
+  
+  private void showNetworkIssueDialog() {
+    String message = """
+        Phát hiện vấn đề kết nối mạng!
+        
+        Tình trạng:
+        • Mạng internet chậm hoặc không ổn định
+        • Một số yêu cầu có thể bị trễ hoặc thất bại
+        • Ứng dụng sẽ tiếp tục hoạt động nhưng có thể chậm
+        
+        Nguyên nhân có thể:
+        1. Kết nối WiFi/Internet không ổn định
+        2. Tốc độ mạng chậm
+        3. Gián đoạn mạng tạm thời
+        
+        Giải pháp:
+        1. Kiểm tra kết nối internet/WiFi
+        2. Thử thao tác lại nếu có lỗi
+        3. Đợi mạng ổn định hơn
+        4. Khởi động lại ứng dụng nếu cần thiết
+        
+        Ứng dụng sẽ tiếp tục hoạt động...
+        """;
+    
+    int option = JOptionPane.showOptionDialog(
+        null,
+        message,
+        "Cảnh Báo - Vấn Đề Mạng",
+        JOptionPane.YES_NO_OPTION,
+        JOptionPane.WARNING_MESSAGE,
+        null,
+        new String[]{"Tiếp Tục", "Đóng Ứng Dụng"},
+        "Tiếp Tục"
+    );
+    
+    if (option == 1) { // User chose to close application
+      System.exit(0);
+    }
+  }
+
+  private void showConnectionLostDialog() {
+    SwingUtilities.invokeLater(() -> {
+      String message = """
+          Mất kết nối với máy chủ!
+          
+          Nguyên nhân có thể:
+          1. Mạng internet bị ngắt kết nối
+          2. WiFi bị mất kết nối
+          3. Máy chủ đã ngừng hoạt động
+          4. Lỗi mạng tạm thời
+          
+          Giải pháp:
+          1. Kiểm tra kết nối internet/WiFi
+          2. Khởi động lại ứng dụng
+          3. Liên hệ quản trị viên nếu vấn đề tiếp tục
+          
+          Ứng dụng sẽ đóng sau khi nhấn OK.
+          """;
+      
+      JOptionPane.showMessageDialog(
+          null,
+          message,
+          "Cảnh Báo - Mất Kết Nối",
+          JOptionPane.WARNING_MESSAGE
+      );
+    });
+  }
+
   @SuppressWarnings("unchecked")
   private <T> void notifyListener(ResponseListener<?> listener, T response) {
     try {

src/main/java/BsK/server/Server.java

@@ -17,6 +17,7 @@ import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.HttpServerCodec;
 import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
 import io.netty.handler.stream.ChunkedWriteHandler;
+import io.netty.handler.timeout.IdleStateHandler;
 import java.awt.Color;
 import java.io.File;
 import java.io.IOException;
@@ -293,6 +294,9 @@ public class Server {
                               .addLast(new ChunkedWriteHandler())
                               .addLast(new HttpObjectAggregator(50  * 1024 * 1024))
                               .addLast(new WebSocketServerProtocolHandler("/", null, true, 50  * 1024 * 1024))
+                              // Add IdleStateHandler with longer timeout to be more tolerant of network issues
+                              // Reader timeout: 90 seconds (longer than client's 60s to allow for network delays)
+                              .addLast(new IdleStateHandler(90, 0, 0))
                               .addLast(new ServerHandler());
                         }
                       });

update_client.bat

@@ -0,0 +1,20 @@
+@echo off
+REM BSK Client Update Script Launcher
+REM This batch file runs the PowerShell update script with proper execution policy
+
+echo BSK Client Update Launcher
+echo =========================
+echo.
+
+REM Change to the script directory
+cd /d "%~dp0"
+
+REM Run the PowerShell script with execution policy bypass
+powershell -ExecutionPolicy Bypass -File ".\update_client_script.ps1"
+
+REM Keep the window open if there's an error
+if errorlevel 1 (
+    echo.
+    echo An error occurred. Press any key to exit...
+    pause >nul
+)

update_client_script.ps1

@@ -0,0 +1,175 @@
+<#
+.SYNOPSIS
+    Checks for a new version of the client JAR application, downloads it, and replaces the old version.
+
+.DESCRIPTION
+    This script is dedicated to updating the client application.
+    It reads a local version_client.json file to determine the current version.
+    It then fetches a remote latest_client.json file from a specified URL to see if a newer version is available.
+    If an update is found, it stops the running client, downloads the new JAR,
+    backs it up, installs the new one, and restarts the client.
+
+.NOTES
+    Author: Dat Le
+    Date: 2025-09-07
+    Version: 1.1.0 (Client Only)
+#>
+
+# --- CONFIGURATION ---
+# IMPORTANT: This URL should now point to your 'latest_client.json' file on GitHub.
+$remoteVersionInfoUrl = "https://github.com/lds217/BSK-All-in-One-Clinic-Management-System/releases/download/v1.1.0/latest.json"
+
+# --- SCRIPT START ---
+$ProgressPreference = 'Continue'
+
+# Get the directory where this script is located.
+$scriptPath = $PSScriptRoot
+# Get the directory where this script is located.
+$scriptPath = $PSScriptRoot
+
+# Define the paths for the local files (now client-specific)
+$localVersionFile = Join-Path $scriptPath "version_client.json"
+$jarFileName = "client.jar"
+$localJarFile = Join-Path $scriptPath $jarFileName
+$backupJarFile = Join-Path $scriptPath "$($jarFileName).old"
+
+# --- Step 1: Read the local version information ---
+Write-Host "Reading local client version info from '$localVersionFile'..."
+if (-not (Test-Path $localVersionFile)) {
+    Write-Error "Error: Local version file not found at '$localVersionFile'. Cannot proceed."
+    Read-Host "Press Enter to exit"
+    exit 1
+}
+
+try {
+    $localVersionInfo = Get-Content $localVersionFile | ConvertFrom-Json
+    Write-Host " - Local Client Version: $($localVersionInfo.currentVersion)"
+}
+catch {
+    Write-Error "Error: Could not read or parse the local version_client.json file. Is it valid JSON?"
+    Read-Host "Press Enter to exit"
+    exit 1
+}
+
+
+# --- Step 2: Fetch the remote version information ---
+Write-Host "Fetching remote client version info from '$remoteVersionInfoUrl'..."
+try {
+    $remoteVersionInfo = Invoke-RestMethod -Uri $remoteVersionInfoUrl
+    Write-Host " - Latest Remote Version: $($remoteVersionInfo.latestVersion)"
+}
+catch {
+    Write-Error "Error: Failed to fetch or parse remote version info. Check the URL and your internet connection."
+    Read-Host "Press Enter to exit"
+    exit 1
+}
+
+
+# --- Step 3: Compare versions ---
+if ([version]$localVersionInfo.currentVersion -ge [version]$remoteVersionInfo.latestVersion) {
+    Write-Host "`nResult: Your client application is up-to-date! (Version $($localVersionInfo.currentVersion))"
+}
+else {
+    Write-Host "`nResult: New version available! (Version $($remoteVersionInfo.latestVersion)). Starting update process."
+    Write-Host "Release Notes: $($remoteVersionInfo.releaseNotes)"
+
+    # Get the correct download URL (now simplified)
+    $downloadUrl = $remoteVersionInfo.files.client
+    if (-not $downloadUrl) {
+        Write-Error "Error: 'downloadUrl' not found in remote JSON."
+        Read-Host "Press Enter to exit"
+        exit 1
+    }
+
+    Write-Host "Download URL: $downloadUrl"
+
+    # --- Step 4: Stop the application ---
+    Write-Host "`nStopping application..."
+    try {
+        # This command finds the java process running 'client.jar' and stops it.
+        Get-CimInstance Win32_Process | Where-Object { $_.CommandLine -like "*$jarFileName*" } | ForEach-Object { Stop-Process -Id $_.ProcessId -Force }
+        Write-Host " - Application stopped successfully."
+        Start-Sleep -Seconds 3 # Give the OS time to release file locks
+    }
+    catch {
+        Write-Warning "Could not automatically stop the application. Please stop it manually before continuing."
+        Read-Host "Press Enter to continue after stopping the application"
+    }
+
+
+    # --- Step 5: Download and Replace ---
+    $tempDownloadPath = Join-Path $scriptPath "client.jar.download"
+
+    Write-Host "`nDownloading new version..."
+    try {
+        # First, get the file size for progress calculation
+        $response = Invoke-WebRequest -Uri $downloadUrl -Method Head
+        $totalSize = [int64]$response.Headers.'Content-Length'
+        
+        Write-Host "File size: $([math]::Round($totalSize/1MB, 2)) MB"
+        Write-Host "Starting download with progress indicator..."
+        
+        # Use Start-BitsTransfer for better progress display if available
+        if (Get-Command Start-BitsTransfer -ErrorAction SilentlyContinue) {
+            Start-BitsTransfer -Source $downloadUrl -Destination $tempDownloadPath -DisplayName "Downloading client.jar" -Description "BSK Client Update"
+        }
+        else {
+            # Fallback: Custom progress implementation
+            $webClient = New-Object System.Net.WebClient
+            
+            # Register progress event
+            Register-ObjectEvent -InputObject $webClient -EventName DownloadProgressChanged -Action {
+                $percent = $Event.SourceEventArgs.ProgressPercentage
+                $received = $Event.SourceEventArgs.BytesReceived
+                $total = $Event.SourceEventArgs.TotalBytesToReceive
+                $speed = [math]::Round($received / 1MB, 2)
+                
+                Write-Progress -Activity "Downloading client.jar" -Status "$percent% Complete" -PercentComplete $percent -CurrentOperation "Downloaded: $speed MB / $([math]::Round($total/1MB, 2)) MB"
+            } | Out-Null
+            
+            try {
+                $webClient.DownloadFile($downloadUrl, $tempDownloadPath)
+                Write-Progress -Activity "Downloading client.jar" -Completed
+            }
+            finally {
+                $webClient.Dispose()
+                Get-EventSubscriber | Unregister-Event
+            }
+        }
+        
+        Write-Host "Download completed successfully!"
+    }
+    catch {
+        Write-Error "Error: Download failed. Please check the URL and your connection."
+        if (Test-Path $tempDownloadPath) { Remove-Item $tempDownloadPath }
+        Read-Host "Press Enter to exit"
+        exit 1
+    }
+
+    Write-Host "`nInstalling update..."
+    if (Test-Path $localJarFile) {
+        Write-Host " - Backing up old version to '$backupJarFile'..."
+        Move-Item -Path $localJarFile -Destination $backupJarFile -Force
+    }
+
+    Write-Host " - Installing new version..."
+    Move-Item -Path $tempDownloadPath -Destination $localJarFile -Force
+
+
+    # --- Step 6: Update the local version file ---
+    Write-Host " - Updating local version number..."
+    # Create a new JSON object to ensure the file is clean
+    @{ currentVersion = $remoteVersionInfo.latestVersion } | ConvertTo-Json -Depth 1 | Set-Content $localVersionFile
+
+
+    # --- Step 7: Restart the application ---
+    # !! CRITICAL !! You MUST customize this step.
+    Write-Host "`nRestarting application (you may need to customize this step)..."
+    # Example: Start-Process "java" -ArgumentList "-jar", $localJarFile
+    # Example: Start-Process ".\start_client.bat"
+    
+    Write-Host "`nUpdate complete! Now running version $($remoteVersionInfo.latestVersion)."
+}
+
+# Pause at the end
+Read-Host "`nPress Enter to exit."

update_server.bat

@@ -0,0 +1,20 @@
+@echo off
+REM BSK Server Update Script Launcher
+REM This batch file runs the PowerShell update script with proper execution policy
+
+echo BSK Server Update Launcher
+echo ========================
+echo.
+
+REM Change to the script directory
+cd /d "%~dp0"
+
+REM Run the PowerShell script with execution policy bypass
+powershell -ExecutionPolicy Bypass -File ".\update_server_script.ps1"
+
+REM Keep the window open if there's an error
+if errorlevel 1 (
+    echo.
+    echo An error occurred. Press any key to exit...
+    pause >nul
+)

update_server_script.ps1

@@ -0,0 +1,175 @@
+<#
+.SYNOPSIS
+    Checks for a new version of the server JAR application, downloads it, and replaces the old version.
+
+.DESCRIPTION
+    This script is dedicated to updating the server application.
+    It reads a local version_server.json file to determine the current version.
+    It then fetches a remote latest_server.json file from a specified URL to see if a newer version is available.
+    If an update is found, it stops the running server, downloads the new JAR,
+    backs it up, installs the new one, and restarts the server.
+
+.NOTES
+    Author: Dat Le
+    Date: 2025-09-07
+    Version: 1.1.0 (Server Only)
+#>
+
+# --- CONFIGURATION ---
+# IMPORTANT: This URL should now point to your 'latest_server.json' file on GitHub.
+$remoteVersionInfoUrl = "https://github.com/lds217/BSK-All-in-One-Clinic-Management-System/releases/download/v1.1.0/latest.json"
+
+# --- SCRIPT START ---
+$ProgressPreference = 'Continue'
+
+# Get the directory where this script is located.
+$scriptPath = $PSScriptRoot
+# Get the directory where this script is located.
+$scriptPath = $PSScriptRoot
+
+# Define the paths for the local files (now server-specific)
+$localVersionFile = Join-Path $scriptPath "version_server.json"
+$jarFileName = "server.jar"
+$localJarFile = Join-Path $scriptPath $jarFileName
+$backupJarFile = Join-Path $scriptPath "$($jarFileName).old"
+
+# --- Step 1: Read the local version information ---
+Write-Host "Reading local server version info from '$localVersionFile'..."
+if (-not (Test-Path $localVersionFile)) {
+    Write-Error "Error: Local version file not found at '$localVersionFile'. Cannot proceed."
+    Read-Host "Press Enter to exit"
+    exit 1
+}
+
+try {
+    $localVersionInfo = Get-Content $localVersionFile | ConvertFrom-Json
+    Write-Host " - Local Server Version: $($localVersionInfo.currentVersion)"
+}
+catch {
+    Write-Error "Error: Could not read or parse the local version_server.json file. Is it valid JSON?"
+    Read-Host "Press Enter to exit"
+    exit 1
+}
+
+
+# --- Step 2: Fetch the remote version information ---
+Write-Host "Fetching remote server version info from '$remoteVersionInfoUrl'..."
+try {
+    $remoteVersionInfo = Invoke-RestMethod -Uri $remoteVersionInfoUrl
+    Write-Host " - Latest Remote Version: $($remoteVersionInfo.latestVersion)"
+}
+catch {
+    Write-Error "Error: Failed to fetch or parse remote version info. Check the URL and your internet connection."
+    Read-Host "Press Enter to exit"
+    exit 1
+}
+
+
+# --- Step 3: Compare versions ---
+if ([version]$localVersionInfo.currentVersion -ge [version]$remoteVersionInfo.latestVersion) {
+    Write-Host "`nResult: Your server application is up-to-date! (Version $($localVersionInfo.currentVersion))"
+}
+else {
+    Write-Host "`nResult: New version available! (Version $($remoteVersionInfo.latestVersion)). Starting update process."
+    Write-Host "Release Notes: $($remoteVersionInfo.releaseNotes)"
+
+    # Get the correct download URL (now simplified)
+    $downloadUrl = $remoteVersionInfo.files.server
+    if (-not $downloadUrl) {
+        Write-Error "Error: 'downloadUrl' not found in remote JSON."
+        Read-Host "Press Enter to exit"
+        exit 1
+    }
+
+    Write-Host "Download URL: $downloadUrl"
+
+    # --- Step 4: Stop the application ---
+    Write-Host "`nStopping application..."
+    try {
+        # This command finds the java process running 'server.jar' and stops it.
+        Get-CimInstance Win32_Process | Where-Object { $_.CommandLine -like "*$jarFileName*" } | ForEach-Object { Stop-Process -Id $_.ProcessId -Force }
+        Write-Host " - Application stopped successfully."
+        Start-Sleep -Seconds 3 # Give the OS time to release file locks
+    }
+    catch {
+        Write-Warning "Could not automatically stop the application. Please stop it manually before continuing."
+        Read-Host "Press Enter to continue after stopping the application"
+    }
+
+
+    # --- Step 5: Download and Replace ---
+    $tempDownloadPath = Join-Path $scriptPath "server.jar.download"
+
+    Write-Host "`nDownloading new version..."
+    try {
+        # First, get the file size for progress calculation
+        $response = Invoke-WebRequest -Uri $downloadUrl -Method Head
+        $totalSize = [int64]$response.Headers.'Content-Length'
+        
+        Write-Host "File size: $([math]::Round($totalSize/1MB, 2)) MB"
+        Write-Host "Starting download with progress indicator..."
+        
+        # Use Start-BitsTransfer for better progress display if available
+        if (Get-Command Start-BitsTransfer -ErrorAction SilentlyContinue) {
+            Start-BitsTransfer -Source $downloadUrl -Destination $tempDownloadPath -DisplayName "Downloading server.jar" -Description "BSK Server Update"
+        }
+        else {
+            # Fallback: Custom progress implementation
+            $webClient = New-Object System.Net.WebClient
+            
+            # Register progress event
+            Register-ObjectEvent -InputObject $webClient -EventName DownloadProgressChanged -Action {
+                $percent = $Event.SourceEventArgs.ProgressPercentage
+                $received = $Event.SourceEventArgs.BytesReceived
+                $total = $Event.SourceEventArgs.TotalBytesToReceive
+                $speed = [math]::Round($received / 1MB, 2)
+                
+                Write-Progress -Activity "Downloading server.jar" -Status "$percent% Complete" -PercentComplete $percent -CurrentOperation "Downloaded: $speed MB / $([math]::Round($total/1MB, 2)) MB"
+            } | Out-Null
+            
+            try {
+                $webClient.DownloadFile($downloadUrl, $tempDownloadPath)
+                Write-Progress -Activity "Downloading server.jar" -Completed
+            }
+            finally {
+                $webClient.Dispose()
+                Get-EventSubscriber | Unregister-Event
+            }
+        }
+        
+        Write-Host "Download completed successfully!"
+    }
+    catch {
+        Write-Error "Error: Download failed. Please check the URL and your connection."
+        if (Test-Path $tempDownloadPath) { Remove-Item $tempDownloadPath }
+        Read-Host "Press Enter to exit"
+        exit 1
+    }
+
+    Write-Host "`nInstalling update..."
+    if (Test-Path $localJarFile) {
+        Write-Host " - Backing up old version to '$backupJarFile'..."
+        Move-Item -Path $localJarFile -Destination $backupJarFile -Force
+    }
+
+    Write-Host " - Installing new version..."
+    Move-Item -Path $tempDownloadPath -Destination $localJarFile -Force
+
+
+    # --- Step 6: Update the local version file ---
+    Write-Host " - Updating local version number..."
+    # Create a new JSON object to ensure the file is clean
+    @{ currentVersion = $remoteVersionInfo.latestVersion } | ConvertTo-Json -Depth 1 | Set-Content $localVersionFile
+
+
+    # --- Step 7: Restart the application ---
+    # !! CRITICAL !! You MUST customize this step.
+    Write-Host "`nRestarting application (you may need to customize this step)..."
+    # Example: Start-Process "java" -ArgumentList "-jar", $localJarFile
+    # Example: Start-Process ".\start_server.bat"
+    
+    Write-Host "`nUpdate complete! Now running version $($remoteVersionInfo.latestVersion)."
+}
+
+# Pause at the end
+Read-Host "`nPress Enter to exit."