Add menu option to import save files for Memory Link

src/main/java/entralinked/gui/view/MainView.java

@@ -7,10 +7,15 @@ import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.net.URISyntaxException;
 import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
 import java.util.List;
+import java.util.Objects;
 import java.util.concurrent.CompletableFuture;
 
 import javax.swing.BorderFactory;
@@ -19,6 +24,7 @@ import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JMenu;
 import javax.swing.JMenuBar;
+import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.JTabbedPane;
@@ -38,8 +44,14 @@ import com.formdev.flatlaf.intellijthemes.FlatOneDarkIJTheme;
 import com.formdev.flatlaf.util.ColorFunctions;
 
 import entralinked.Entralinked;
+import entralinked.GameVersion;
+import entralinked.gui.FileChooser;
 import entralinked.gui.panels.DashboardPanel;
+import entralinked.model.player.Player;
+import entralinked.model.player.PlayerManager;
 import entralinked.utility.ConsumerAppender;
+import entralinked.utility.GsidUtility;
+import entralinked.utility.LEInputStream;
 import entralinked.utility.SwingUtility;
 
 /**
@@ -52,9 +64,13 @@ public class MainView {
     public static final Color TEXT_COLOR_ERROR = Color.RED.darker();
     private final StyleContext styleContext = StyleContext.getDefaultStyleContext();
     private final AttributeSet fontAttribute = styleContext.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.FontFamily, "Consolas");
+    private final Entralinked entralinked;
+    private final JFrame frame;
     private final JLabel statusLabel;
     
     public MainView(Entralinked entralinked) {
+        this.entralinked = entralinked;
+        
         // Set look and feel
         FlatOneDarkIJTheme.setup();
         UIManager.getDefaults().put("Component.focusedBorderColor", UIManager.get("Component.borderColor"));
@@ -112,10 +128,15 @@ public class MainView {
         tabbedPane.addTab("Dashboard", new DashboardPanel(entralinked));
         
         // Create window
-        JFrame frame = new JFrame("Entralinked");
+        frame = new JFrame("Entralinked");
         
         // Create menu bar
         JMenuBar menuBar = new JMenuBar();
+        JMenu toolsMenu = new JMenu("Tools");
+        toolsMenu.add(SwingUtility.createAction("Import save file (Memory Link)", () -> FileChooser.showFileOpenDialog(frame, selection -> {
+            importSaveFile(selection.file());
+        })));
+        menuBar.add(toolsMenu);
         JMenu helpMenu = new JMenu("Help");
         helpMenu.add(SwingUtility.createAction("Update PID (Error 60000)", () -> new PidToolDialog(entralinked, frame)));
         helpMenu.add(SwingUtility.createAction("GitHub", () -> {
@@ -159,4 +180,77 @@ public class MainView {
     public void setStatusLabelText(String text) {
         statusLabel.setText(text);
     }
+    
+    private void importSaveFile(File file) {
+        // Check file size
+        if(file.length() != 524288) {
+            JOptionPane.showMessageDialog(frame, "Invalid file length.\n"
+                    + "Expected 524288 bytes, got %s.".formatted(file.length()), "Attention", JOptionPane.WARNING_MESSAGE);
+            return;
+        }
+        
+        PlayerManager playerManager = entralinked.getPlayerManager();
+        Player player = null;
+        GameVersion version = null;
+        
+        try(LEInputStream inputStream = new LEInputStream(new FileInputStream(file))) {
+            inputStream.skipNBytes(0x19400); // Skip to trainer info
+            inputStream.skipNBytes(0x4);
+            String name = inputStream.readUTF16(7);
+            inputStream.skipNBytes(0x2);
+            int trainerId = inputStream.readInt();
+            int profileId = inputStream.readInt();
+            inputStream.skipNBytes(0x2);
+            int language = inputStream.read();
+            int romCode = inputStream.read();
+            version = GameVersion.lookup(romCode, language);
+            
+            // Check game version
+            if(version == null || version.isVersion2()) {
+                JOptionPane.showMessageDialog(frame, "This is not a Black & White save file.", "Attention", JOptionPane.WARNING_MESSAGE);
+                return;
+            }
+            
+            String gameSyncId = GsidUtility.stringifyGameSyncId(profileId == 0 ? Objects.hash(name, trainerId) & 0x7FFFFFFF : profileId);
+            player = playerManager.doesPlayerExist(gameSyncId) ? playerManager.getPlayer(gameSyncId) : playerManager.registerPlayer(gameSyncId, version);
+        } catch(Exception e) {
+            SwingUtility.showExceptionInfo(frame, "Failed to read save data.", e);
+            return;
+        }
+        
+        // Check if player exists
+        if(player == null) {
+            JOptionPane.showMessageDialog(frame, "Failed to create player data.", "Attention", JOptionPane.WARNING_MESSAGE);
+            return;
+        }
+        
+        // Check version mismatch
+        if(player.getGameVersion() != version) {
+            if(!SwingUtility.showIgnorableConfirmDialog(frame,
+                "The game version stored in the profile data does not match.\n"
+                + "Do you want to overwrite it and import the save file anyway?", "Attention")) {
+                return;
+            }
+            
+            player.setGameVersion(version);
+            
+            // Try to save player data
+            if(!playerManager.savePlayer(player)) {
+                JOptionPane.showMessageDialog(frame, "Failed to save player data.", "Attention", JOptionPane.WARNING_MESSAGE);
+                return;
+            }
+        }
+        
+        // Copy save file
+        try {
+            Files.copy(file.toPath(), player.getSaveFile().toPath(), StandardCopyOption.REPLACE_EXISTING);
+        } catch(Exception e) {
+            SwingUtility.showExceptionInfo(frame, "Failed to import save data.", e);
+            return;
+        }
+        
+        JOptionPane.showMessageDialog(frame, "Save file has been imported successfully!\n"
+                + "You can now use Memory Link with the following Game Sync ID:\n\n%s".formatted(player.getGameSyncId()),
+                "Attention", JOptionPane.INFORMATION_MESSAGE);
+    }
 }

src/main/java/entralinked/model/player/PlayerManager.java

@@ -186,7 +186,13 @@ public class PlayerManager {
     public Player registerPlayer(String gameSyncId, GameVersion version) {
         // Check for duplicate Game Sync ID
         if(playerMap.containsKey(gameSyncId)) {
-            logger.warn("Attempted to register duplicate player {}", gameSyncId);
+            logger.warn("Attempted to register duplicate Game Sync ID: {}", gameSyncId);
+            return null;
+        }
+        
+        // Check if Game Sync ID is valid
+        if(!GsidUtility.isValidGameSyncId(gameSyncId)) {
+            logger.warn("Attempted to register invalid Game Sync ID: {}", gameSyncId);
             return null;
         }
         

src/main/java/entralinked/utility/LEInputStream.java

@@ -48,4 +48,23 @@ public class LEInputStream extends FilterInputStream {
     public double readDouble() throws IOException {
         return Double.longBitsToDouble(readLong());
     }
+    
+    public String readUTF16(int length) throws IOException {
+        char[] charBuffer = new char[length];
+        int read = 0;
+        
+        for(int i = 0; i < charBuffer.length; i++) {
+            int c = readShort() & 0xFFFF;
+            
+            if(c == 0xFFFF) {
+                break;
+            }
+            
+            charBuffer[i] = (char)c;
+            read++;
+        }
+        
+        skipNBytes((length - (read + 1)) * 2);
+        return new String(charBuffer, 0, read);
+    }
 }