diff --git a/new-shapes.wiki b/new-shapes.wiki
new file mode 160000
index 0000000..731a57b
--- /dev/null
+++ b/new-shapes.wiki
@@ -0,0 +1 @@
+Subproject commit 731a57b080f9baa4d03ba3513d642345b410beaa
diff --git a/pom.xml b/pom.xml
index a5d870a..88702ff 100644
--- a/pom.xml
+++ b/pom.xml
@@ -68,6 +68,12 @@
     <version>1.0-SNAPSHOT</version>
 
     <dependencies>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.18.3</version>
+        </dependency>
+
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
diff --git a/src/main/java/ovh/gasser/newshapes/App.java b/src/main/java/ovh/gasser/newshapes/App.java
index 1ce223d..8674dba 100644
--- a/src/main/java/ovh/gasser/newshapes/App.java
+++ b/src/main/java/ovh/gasser/newshapes/App.java
@@ -11,6 +11,8 @@ import ovh.gasser.newshapes.ui.listeners.MenuEditListener;
 
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
 import java.io.FileNotFoundException;
 
 public class App {
@@ -19,6 +21,8 @@ public class App {
     private SCollection model;
     private JCheckBoxMenuItem editFill;
     private JCheckBoxMenuItem editBorder;
+    private JMenuItem editGroup;
+    private JMenuItem editUngroup;
 
     private App() throws HeadlessException {
         final JFrame frame = new JFrame("Reactive shapes");
@@ -71,12 +75,38 @@ public class App {
 
     private JMenu buildFileMenu(ShapesView sview) {
         JMenu menuFile = new JMenu("File");
+        JMenuItem openItem = new JMenuItem("Open");
+        JMenuItem saveItem = new JMenuItem("Save");
         JMenuItem addRectItem = new JMenuItem("Add SRectangle");
         JMenuItem addCircleItem = new JMenuItem("Add SCircle");
         JMenuItem addTextItem = new JMenuItem("Add Text");
         JMenuItem htmlExportItem = new JMenuItem("Export to HTML");
         JMenuItem svgExportItem = new JMenuItem("Export to SVG");
         JMenuItem exitItem = new JMenuItem("Exit");
+
+        openItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_DOWN_MASK));
+        saveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_DOWN_MASK));
+
+        openItem.addActionListener(evt -> {
+            JFileChooser chooser = new JFileChooser();
+            chooser.setFileFilter(new javax.swing.filechooser.FileNameExtensionFilter("JSON Files", "json"));
+            if (chooser.showOpenDialog(sview) == JFileChooser.APPROVE_OPTION) {
+                sview.getController().loadDrawing(chooser.getSelectedFile());
+            }
+        });
+
+        saveItem.addActionListener(evt -> {
+            JFileChooser chooser = new JFileChooser();
+            chooser.setFileFilter(new javax.swing.filechooser.FileNameExtensionFilter("JSON Files", "json"));
+            if (chooser.showSaveDialog(sview) == JFileChooser.APPROVE_OPTION) {
+                java.io.File file = chooser.getSelectedFile();
+                if (!file.getName().endsWith(".json")) {
+                    file = new java.io.File(file.getAbsolutePath() + ".json");
+                }
+                sview.getController().saveDrawing(file);
+            }
+        });
+
         addRectItem.addActionListener(new MenuAddListener("SRectangle", model, sview));
         addCircleItem.addActionListener(new MenuAddListener("SCircle", model, sview));
         addTextItem.addActionListener(evt -> sview.getController().enterTextMode());
@@ -95,6 +125,10 @@ public class App {
             }
         });
         exitItem.addActionListener(evt -> System.exit(0));
+
+        menuFile.add(openItem);
+        menuFile.add(saveItem);
+        menuFile.addSeparator();
         menuFile.add(addRectItem);
         menuFile.add(addCircleItem);
         menuFile.add(addTextItem);
@@ -108,32 +142,62 @@ public class App {
     private JMenu buildEditMenu(ShapesView sview) {
         MenuEditListener editListener = new MenuEditListener(model, sview, sview.getController());
         JMenu menuEdit = new JMenu("Edit");
+        JMenuItem cutItem = new JMenuItem("Cut");
+        JMenuItem copyItem = new JMenuItem("Copy");
+        JMenuItem pasteItem = new JMenuItem("Paste");
         JMenuItem editColor = new JMenuItem("Change color");
         JMenuItem editBorderColor = new JMenuItem("Change border color");
         JMenuItem deleteItem = new JMenuItem("Delete");
+        editGroup = new JMenuItem("Group");
+        editUngroup = new JMenuItem("Ungroup");
         editFill = new JCheckBoxMenuItem("Fill Shape");
         editBorder = new JCheckBoxMenuItem("Draw border");
+
+        cutItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_DOWN_MASK));
+        copyItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_DOWN_MASK));
+        pasteItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_DOWN_MASK));
+        editGroup.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_G, InputEvent.CTRL_DOWN_MASK));
+        editUngroup.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_G, InputEvent.CTRL_DOWN_MASK | InputEvent.SHIFT_DOWN_MASK));
+
+        cutItem.addActionListener(evt -> sview.getController().cutSelection());
+        copyItem.addActionListener(evt -> sview.getController().copySelection());
+        pasteItem.addActionListener(evt -> sview.getController().pasteClipboard());
         editColor.addActionListener(editListener);
         editBorderColor.addActionListener(editListener);
         deleteItem.addActionListener(editListener);
+        editGroup.addActionListener(evt -> sview.getController().group());
+        editUngroup.addActionListener(evt -> sview.getController().ungroup());
         editFill.addActionListener(editListener);
         editBorder.addActionListener(editListener);
+        editGroup.setEnabled(false);
+        editUngroup.setEnabled(false);
 
+        menuEdit.add(cutItem);
+        menuEdit.add(copyItem);
+        menuEdit.add(pasteItem);
+        menuEdit.addSeparator();
         menuEdit.add(editColor);
         menuEdit.add(editBorderColor);
         menuEdit.add(deleteItem);
         menuEdit.addSeparator();
+        menuEdit.add(editGroup);
+        menuEdit.add(editUngroup);
+        menuEdit.addSeparator();
         menuEdit.add(editBorder);
         menuEdit.add(editFill);
         return menuEdit;
     }
 
     private void updateMenuState(Iterable<Shape> selectedShapes) {
+        int selectionCount = 0;
+        boolean singleCollectionSelected = false;
         boolean hasToggleableShapes = false;
         boolean allFilled = true;
         boolean allStroked = true;
 
         for (Shape s : selectedShapes) {
+            selectionCount++;
+            singleCollectionSelected = selectionCount == 1 && s instanceof SCollection;
             if (s instanceof SText) {
                 continue;
             }
@@ -145,6 +209,8 @@ public class App {
             }
         }
 
+        editGroup.setEnabled(selectionCount > 1);
+        editUngroup.setEnabled(selectionCount == 1 && singleCollectionSelected);
         updateMenuItem(editFill, hasToggleableShapes, allFilled);
         updateMenuItem(editBorder, hasToggleableShapes, allStroked);
     }
diff --git a/src/main/java/ovh/gasser/newshapes/persistence/DrawingSerializer.java b/src/main/java/ovh/gasser/newshapes/persistence/DrawingSerializer.java
new file mode 100644
index 0000000..5305bca
--- /dev/null
+++ b/src/main/java/ovh/gasser/newshapes/persistence/DrawingSerializer.java
@@ -0,0 +1,43 @@
+package ovh.gasser.newshapes.persistence;
+
+import com.fasterxml.jackson.core.Version;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import ovh.gasser.newshapes.shapes.SCollection;
+import ovh.gasser.newshapes.shapes.Shape;
+
+import java.io.File;
+import java.io.IOException;
+
+public class DrawingSerializer {
+    private static final String VERSION = "1.0";
+    private final ObjectMapper mapper;
+
+    public DrawingSerializer() {
+        this.mapper = new ObjectMapper();
+        SimpleModule module = new SimpleModule("ShapeModule", new Version(1, 0, 0, null, null, null));
+        module.addSerializer(Shape.class, new ShapeSerializer());
+        module.addDeserializer(Shape.class, new ShapeDeserializer());
+        this.mapper.registerModule(module);
+    }
+
+    public void save(SCollection model, File file) throws IOException {
+        DrawingData data = new DrawingData();
+        data.version = VERSION;
+        data.shapes = new java.util.ArrayList<>();
+        for (Shape shape : model) {
+            data.shapes.add(shape);
+        }
+        mapper.writerWithDefaultPrettyPrinter().writeValue(file, data);
+    }
+
+    public SCollection load(File file) throws IOException {
+        DrawingData data = mapper.readValue(file, DrawingData.class);
+        return SCollection.of(data.shapes.toArray(new Shape[0]));
+    }
+
+    public static class DrawingData {
+        public String version;
+        public java.util.List<Shape> shapes;
+    }
+}
diff --git a/src/main/java/ovh/gasser/newshapes/persistence/ShapeDeserializer.java b/src/main/java/ovh/gasser/newshapes/persistence/ShapeDeserializer.java
new file mode 100644
index 0000000..f627629
--- /dev/null
+++ b/src/main/java/ovh/gasser/newshapes/persistence/ShapeDeserializer.java
@@ -0,0 +1,159 @@
+package ovh.gasser.newshapes.persistence;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+import ovh.gasser.newshapes.shapes.SCircle;
+import ovh.gasser.newshapes.shapes.SCollection;
+import ovh.gasser.newshapes.shapes.SPolygon;
+import ovh.gasser.newshapes.shapes.SRectangle;
+import ovh.gasser.newshapes.shapes.SText;
+import ovh.gasser.newshapes.shapes.STriangle;
+import ovh.gasser.newshapes.shapes.Shape;
+
+import java.awt.*;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ShapeDeserializer extends StdDeserializer<Shape> {
+
+    public ShapeDeserializer() {
+        super(Shape.class);
+    }
+
+    @Override
+    public Shape deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
+        JsonNode node = p.getCodec().readTree(p);
+        String type = node.get("type").asText();
+
+        return switch (type) {
+            case "rectangle" -> deserializeRectangle(node);
+            case "circle" -> deserializeCircle(node);
+            case "triangle" -> deserializeTriangle(node);
+            case "text" -> deserializeText(node);
+            case "polygon" -> deserializePolygon(node);
+            case "collection" -> deserializeCollection(node, p, ctxt);
+            default -> throw new IllegalArgumentException("Unknown shape type: " + type);
+        };
+    }
+
+    private SRectangle deserializeRectangle(JsonNode node) {
+        int x = node.get("x").asInt();
+        int y = node.get("y").asInt();
+        int width = node.get("width").asInt();
+        int height = node.get("height").asInt();
+
+        Color strokeColor = extractStrokeColor(node);
+        return SRectangle.create(x, y, width, height, strokeColor);
+    }
+
+    private SCircle deserializeCircle(JsonNode node) {
+        int x = node.get("x").asInt();
+        int y = node.get("y").asInt();
+        int radius = node.get("radius").asInt();
+
+        Color strokeColor = extractStrokeColor(node);
+        Color fillColor = extractFillColor(node);
+
+        SCircle circle = SCircle.create(x + radius, y + radius, radius);
+        circle.addAttributes(new ovh.gasser.newshapes.attributes.ColorAttributes(
+                fillColor != null, strokeColor != null, strokeColor, fillColor));
+        return circle;
+    }
+
+    private STriangle deserializeTriangle(JsonNode node) {
+        int x = node.get("x").asInt();
+        int y = node.get("y").asInt();
+        int size = node.get("size").asInt();
+
+        Color strokeColor = extractStrokeColor(node);
+        Color fillColor = extractFillColor(node);
+
+        return STriangle.create(x, y, size, fillColor != null ? fillColor : Color.YELLOW,
+                strokeColor != null ? strokeColor : Color.BLACK);
+    }
+
+    private SText deserializeText(JsonNode node) {
+        int x = node.get("x").asInt();
+        int y = node.get("y").asInt();
+        String text = node.get("text").asText();
+
+        Color strokeColor = extractStrokeColor(node);
+
+        SText sText = SText.create(x, y, text);
+        if (strokeColor != null) {
+            sText.addAttributes(new ovh.gasser.newshapes.attributes.ColorAttributes(
+                    true, true, strokeColor, strokeColor));
+        }
+        return sText;
+    }
+
+    private SPolygon deserializePolygon(JsonNode node) {
+        List<Point> points = new ArrayList<>();
+        JsonNode pointsNode = node.get("points");
+        for (JsonNode pointNode : pointsNode) {
+            int x = pointNode.get("x").asInt();
+            int y = pointNode.get("y").asInt();
+            points.add(new Point(x, y));
+        }
+
+        Color strokeColor = extractStrokeColor(node);
+        Color fillColor = extractFillColor(node);
+
+        SPolygon poly = SPolygon.create(points);
+        if (strokeColor != null || fillColor != null) {
+            poly.addAttributes(new ovh.gasser.newshapes.attributes.ColorAttributes(
+                    fillColor != null, strokeColor != null,
+                    strokeColor != null ? strokeColor : Color.BLACK,
+                    fillColor != null ? fillColor : Color.BLACK));
+        }
+        return poly;
+    }
+
+    private SCollection deserializeCollection(JsonNode node, JsonParser p, DeserializationContext ctxt) throws IOException {
+        List<Shape> children = new ArrayList<>();
+        JsonNode shapesNode = node.get("shapes");
+        if (shapesNode != null && shapesNode.isArray()) {
+            for (JsonNode childNode : shapesNode) {
+                JsonParser childParser = childNode.traverse(p.getCodec());
+                children.add(deserialize(childParser, ctxt));
+            }
+        }
+        return SCollection.of(children.toArray(new Shape[0]));
+    }
+
+    private Color extractStrokeColor(JsonNode node) {
+        if (node.has("color")) {
+            JsonNode colorNode = node.get("color");
+            if (colorNode.has("stroked") && colorNode.get("stroked").asBoolean()) {
+                return hexToColor(colorNode.get("strokedColor").asText());
+            }
+        }
+        return null;
+    }
+
+    private Color extractFillColor(JsonNode node) {
+        if (node.has("color")) {
+            JsonNode colorNode = node.get("color");
+            if (colorNode.has("filled") && colorNode.get("filled").asBoolean()) {
+                return hexToColor(colorNode.get("filledColor").asText());
+            }
+        }
+        return null;
+    }
+
+    private Color hexToColor(String hex) {
+        if (hex == null || hex.isEmpty()) return Color.BLACK;
+        try {
+            return new Color(
+                    Integer.parseInt(hex.substring(1, 3), 16),
+                    Integer.parseInt(hex.substring(3, 5), 16),
+                    Integer.parseInt(hex.substring(5, 7), 16)
+            );
+        } catch (Exception e) {
+            return Color.BLACK;
+        }
+    }
+}
diff --git a/src/main/java/ovh/gasser/newshapes/persistence/ShapeSerializer.java b/src/main/java/ovh/gasser/newshapes/persistence/ShapeSerializer.java
new file mode 100644
index 0000000..8a7961d
--- /dev/null
+++ b/src/main/java/ovh/gasser/newshapes/persistence/ShapeSerializer.java
@@ -0,0 +1,121 @@
+package ovh.gasser.newshapes.persistence;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import ovh.gasser.newshapes.attributes.ColorAttributes;
+import ovh.gasser.newshapes.shapes.SCircle;
+import ovh.gasser.newshapes.shapes.SCollection;
+import ovh.gasser.newshapes.shapes.SPolygon;
+import ovh.gasser.newshapes.shapes.SRectangle;
+import ovh.gasser.newshapes.shapes.SText;
+import ovh.gasser.newshapes.shapes.STriangle;
+import ovh.gasser.newshapes.shapes.Shape;
+
+import java.awt.*;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ShapeSerializer extends JsonSerializer<Shape> {
+
+    @Override
+    public void serialize(Shape shape, JsonGenerator gen, SerializerProvider serializers) throws IOException {
+        gen.writeStartObject();
+
+        if (shape instanceof SRectangle rect) {
+            gen.writeStringField("type", "rectangle");
+            writeRectangle(rect, gen);
+        } else if (shape instanceof SCircle circle) {
+            gen.writeStringField("type", "circle");
+            writeCircle(circle, gen);
+        } else if (shape instanceof STriangle tri) {
+            gen.writeStringField("type", "triangle");
+            writeTriangle(tri, gen);
+        } else if (shape instanceof SText text) {
+            gen.writeStringField("type", "text");
+            writeText(text, gen);
+        } else if (shape instanceof SPolygon poly) {
+            gen.writeStringField("type", "polygon");
+            writePolygon(poly, gen);
+        } else if (shape instanceof SCollection coll) {
+            gen.writeStringField("type", "collection");
+            writeCollection(coll, gen);
+        }
+
+        gen.writeEndObject();
+    }
+
+    private void writeRectangle(SRectangle rect, JsonGenerator gen) throws IOException {
+        Rectangle bounds = rect.getBounds();
+        gen.writeNumberField("x", bounds.x);
+        gen.writeNumberField("y", bounds.y);
+        gen.writeNumberField("width", bounds.width);
+        gen.writeNumberField("height", bounds.height);
+        writeColorAttributes(rect, gen);
+    }
+
+    private void writeCircle(SCircle circle, JsonGenerator gen) throws IOException {
+        Rectangle bounds = circle.getBounds();
+        gen.writeNumberField("x", bounds.x);
+        gen.writeNumberField("y", bounds.y);
+        gen.writeNumberField("radius", circle.getRadius());
+        writeColorAttributes(circle, gen);
+    }
+
+    private void writeTriangle(STriangle tri, JsonGenerator gen) throws IOException {
+        Rectangle bounds = tri.getBounds();
+        gen.writeNumberField("x", bounds.x);
+        gen.writeNumberField("y", bounds.y);
+        gen.writeNumberField("size", bounds.width);
+        writeColorAttributes(tri, gen);
+    }
+
+    private void writeText(SText text, JsonGenerator gen) throws IOException {
+        Rectangle bounds = text.getBounds();
+        gen.writeNumberField("x", bounds.x);
+        gen.writeNumberField("y", bounds.y);
+        gen.writeStringField("text", text.getText());
+        gen.writeStringField("fontName", text.getFontName());
+        gen.writeNumberField("fontSize", text.getFontSize());
+        gen.writeNumberField("fontStyle", text.getFontStyle());
+        writeColorAttributes(text, gen);
+    }
+
+    private void writePolygon(SPolygon poly, JsonGenerator gen) throws IOException {
+        gen.writeArrayFieldStart("points");
+        for (Point p : poly.getPoints()) {
+            gen.writeStartObject();
+            gen.writeNumberField("x", p.x);
+            gen.writeNumberField("y", p.y);
+            gen.writeEndObject();
+        }
+        gen.writeEndArray();
+        writeColorAttributes(poly, gen);
+    }
+
+    private void writeCollection(SCollection coll, JsonGenerator gen) throws IOException {
+        gen.writeArrayFieldStart("shapes");
+        for (Shape child : coll) {
+            serialize(child, gen, null);
+        }
+        gen.writeEndArray();
+    }
+
+    private void writeColorAttributes(Shape shape, JsonGenerator gen) throws IOException {
+        ColorAttributes attrs = (ColorAttributes) shape.getAttributes(ColorAttributes.ID);
+        if (attrs != null) {
+            gen.writeObjectFieldStart("color");
+            gen.writeBooleanField("filled", attrs.filled);
+            gen.writeBooleanField("stroked", attrs.stroked);
+            gen.writeStringField("filledColor", colorToHex(attrs.filledColor));
+            gen.writeStringField("strokedColor", colorToHex(attrs.strokedColor));
+            gen.writeEndObject();
+        }
+    }
+
+    private String colorToHex(Color c) {
+        if (c == null) return "#000000";
+        return String.format("#%02x%02x%02x", c.getRed(), c.getGreen(), c.getBlue());
+    }
+}
diff --git a/src/main/java/ovh/gasser/newshapes/ui/Controller.java b/src/main/java/ovh/gasser/newshapes/ui/Controller.java
index f1b2205..a3fbb7f 100644
--- a/src/main/java/ovh/gasser/newshapes/ui/Controller.java
+++ b/src/main/java/ovh/gasser/newshapes/ui/Controller.java
@@ -5,6 +5,15 @@ import org.slf4j.LoggerFactory;
 import ovh.gasser.newshapes.HTMLExporter;
 import ovh.gasser.newshapes.Selection;
 import ovh.gasser.newshapes.attributes.ColorAttributes;
+import ovh.gasser.newshapes.persistence.DrawingSerializer;
+import ovh.gasser.newshapes.command.AddShapeCommand;
+import ovh.gasser.newshapes.command.ChangeColorCommand;
+import ovh.gasser.newshapes.command.Command;
+import ovh.gasser.newshapes.command.CommandHistory;
+import ovh.gasser.newshapes.command.CommandHistoryListener;
+import ovh.gasser.newshapes.command.MoveShapeCommand;
+import ovh.gasser.newshapes.command.RemoveShapeCommand;
+import ovh.gasser.newshapes.command.ResizeShapeCommand;
 import ovh.gasser.newshapes.shapes.ResizeHandle;
 import ovh.gasser.newshapes.shapes.SCollection;
 import ovh.gasser.newshapes.shapes.SText;
@@ -13,18 +22,28 @@ import ovh.gasser.newshapes.ui.listeners.SelectionListener;
 
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.InputEvent;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
 import java.util.Optional;
+import java.util.function.Function;
 
 public class Controller {
-    private final static Logger logger = LoggerFactory.getLogger(Controller.class);
+    private static final Logger logger = LoggerFactory.getLogger(Controller.class);
+
     private final ShapesView view;
     private final SCollection model;
     private final Selection selection;
+    private final CommandHistory commandHistory;
 
     private Point lastMousePos;
     private boolean addingText;
@@ -35,11 +54,24 @@ public class Controller {
     private Point selectionBoxStart;
     private Point selectionBoxEnd;
     private boolean boxSelecting;
+    private Point dragStartMousePos;
+    private Map<Shape, Rectangle> dragStartBounds = Map.of();
+    private final Runnable onModelChanged;
+    private java.util.List<Shape> clipboard = java.util.List.of();
+    private int pasteCount = 0;
+    private static final int PASTE_OFFSET = 20;
+    private boolean additiveBoxSelection;
 
     Controller(ShapesView view, SCollection model) {
+        this(view, model, () -> { });
+    }
+
+    Controller(ShapesView view, SCollection model, Runnable onModelChanged) {
         this.view = view;
         this.model = model;
+        this.onModelChanged = onModelChanged;
         this.selection = new Selection();
+        this.commandHistory = new CommandHistory();
 
         var adapter = new MouseAdapter() {
             @Override
@@ -54,14 +86,7 @@ public class Controller {
 
             @Override
             public void mouseReleased(MouseEvent evt) {
-                resizing = false;
-                activeHandle = null;
-                resizeOrigin = null;
-                boxSelecting = false;
-                selectionBoxStart = null;
-                selectionBoxEnd = null;
-                view.setCurrentSelectionBox(null);
-                view.repaint();
+                handleMouseReleased(evt);
             }
         };
         this.view.addMouseMotionListener(adapter);
@@ -74,6 +99,249 @@ public class Controller {
         });
     }
 
+    public void addShape(Shape shape) {
+        executeAndRefresh(new AddShapeCommand(model, shape));
+    }
+
+    public void addSelectionChangeListener(SelectionListener listener) {
+        selection.addListener(listener);
+    }
+
+    public void addHistoryChangeListener(CommandHistoryListener listener) {
+        commandHistory.addListener(listener);
+    }
+
+    public boolean canUndo() {
+        return commandHistory.canUndo();
+    }
+
+    public boolean canRedo() {
+        return commandHistory.canRedo();
+    }
+
+    public void undo() {
+        if (!commandHistory.canUndo()) {
+            return;
+        }
+
+        resetSelection();
+        commandHistory.undo();
+        view.repaint();
+    }
+
+    public void redo() {
+        if (!commandHistory.canRedo()) {
+            return;
+        }
+
+        resetSelection();
+        commandHistory.redo();
+        view.repaint();
+    }
+
+    public void saveDrawing(java.io.File file) {
+        try {
+            new DrawingSerializer().save(model, file);
+            logger.info("Saved drawing to {}", file.getAbsolutePath());
+        } catch (java.io.IOException e) {
+            logger.error("Failed to save drawing: {}", e.getMessage());
+            JOptionPane.showMessageDialog(view, "Failed to save: " + e.getMessage(), "Save Error", JOptionPane.ERROR_MESSAGE);
+        }
+    }
+
+    public void loadDrawing(java.io.File file) {
+        try {
+            SCollection loaded = new DrawingSerializer().load(file);
+            model.stream().toList().forEach(model::remove);
+            loaded.forEach(model::add);
+            resetSelection();
+            view.repaint();
+            logger.info("Loaded drawing from {}", file.getAbsolutePath());
+        } catch (java.io.IOException e) {
+            logger.error("Failed to load drawing: {}", e.getMessage());
+            JOptionPane.showMessageDialog(view, "Failed to load: " + e.getMessage(), "Load Error", JOptionPane.ERROR_MESSAGE);
+        }
+    }
+
+    public void enterTextMode() {
+        addingText = true;
+    }
+
+    public void deleteSelected() {
+        List<Shape> selectedShapes = selection.getSelectedShapes();
+        if (selectedShapes.isEmpty()) {
+            return;
+        }
+
+        logger.debug("Deleting selected shape(s)");
+        executeAndRefresh(new RemoveShapeCommand(model, selectedShapes));
+        resetSelection();
+    }
+
+    public void copySelection() {
+        List<Shape> selectedShapes = selection.getSelectedShapes();
+        if (selectedShapes.isEmpty()) {
+            logger.debug("No selection to copy");
+            return;
+        }
+
+        clipboard = selectedShapes.stream()
+                .map(Shape::clone)
+                .toList();
+        pasteCount = 0;
+    }
+
+    public void cutSelection() {
+        List<Shape> selectedShapes = selection.getSelectedShapes();
+        if (selectedShapes.isEmpty()) {
+            logger.debug("No selection to cut");
+            return;
+        }
+
+        clipboard = selectedShapes.stream()
+                .map(Shape::clone)
+                .toList();
+        pasteCount = 0;
+
+        for (Shape shape : selectedShapes) {
+            model.remove(shape);
+        }
+        resetSelection();
+        onModelChanged.run();
+        view.repaint();
+    }
+
+    public void pasteClipboard() {
+        if (clipboard.isEmpty()) {
+            logger.debug("Clipboard is empty");
+            return;
+        }
+
+        pasteCount++;
+        int offset = PASTE_OFFSET * pasteCount;
+
+        resetSelection();
+
+        for (Shape original : clipboard) {
+            Shape clone = original.clone();
+            clone.translate(offset, offset);
+            model.add(clone);
+            selection.add(clone);
+        }
+
+        onModelChanged.run();
+        view.repaint();
+    }
+
+    public void group() {
+        List<Shape> selectedShapes = selection.getSelectedShapes();
+        if (selectedShapes.size() < 2) {
+            logger.debug("Need at least 2 shapes to group");
+            return;
+        }
+
+        int minIndex = selectedShapes.stream()
+                .mapToInt(model::indexOf)
+                .min()
+                .orElse(0);
+
+        for (Shape shape : selectedShapes) {
+            model.remove(shape);
+            shape.addAttributes(new ovh.gasser.newshapes.attributes.SelectionAttributes(false));
+        }
+
+        Shape[] shapesArray = selectedShapes.toArray(new Shape[0]);
+        SCollection group = SCollection.of(shapesArray);
+
+        model.insert(minIndex, group);
+        resetSelection();
+        selection.add(group);
+        onModelChanged.run();
+        view.repaint();
+    }
+
+    public void ungroup() {
+        List<Shape> selectedShapes = selection.getSelectedShapes();
+        if (selectedShapes.size() != 1) {
+            logger.debug("Can only ungroup a single selected group");
+            return;
+        }
+
+        Shape selected = selectedShapes.get(0);
+        if (!(selected instanceof SCollection group)) {
+            logger.debug("Selected shape is not a group");
+            return;
+        }
+
+        List<Shape> children = new ArrayList<>();
+        group.forEach(children::add);
+
+        model.remove(group);
+
+        for (Shape child : children) {
+            model.add(child);
+        }
+
+        resetSelection();
+        for (Shape child : children) {
+            selection.add(child);
+        }
+        onModelChanged.run();
+        view.repaint();
+    }
+
+    public void changeSelectionColor() {
+        changeColors(shape -> new ColorAttributes(false, true, Color.BLACK, randomColor()));
+    }
+
+    public void changeSelectionFillColor(Color filledColor) {
+        if (filledColor == null) {
+            return;
+        }
+
+        changeColors(shape -> {
+            ColorAttributes current = currentColor(shape);
+            if (shape instanceof SText) {
+                return new ColorAttributes(current.filled, current.stroked, filledColor, filledColor);
+            }
+            return new ColorAttributes(true, current.stroked, filledColor, current.strokedColor);
+        });
+    }
+
+    public void changeSelectionBorderColor(Color strokedColor) {
+        if (strokedColor == null) {
+            return;
+        }
+
+        changeColors(shape -> {
+            ColorAttributes current = currentColor(shape);
+            if (shape instanceof SText) {
+                return new ColorAttributes(current.filled, current.stroked, strokedColor, strokedColor);
+            }
+            return new ColorAttributes(current.filled, true, current.filledColor, strokedColor);
+        });
+    }
+
+    public void setSelectionBorder(boolean state) {
+        changeColors(shape -> {
+            if (shape instanceof SText) {
+                return null;
+            }
+            ColorAttributes current = currentColor(shape);
+            return new ColorAttributes(current.filled, state, current.filledColor, current.strokedColor);
+        });
+    }
+
+    public void setSelectionFilled(boolean state) {
+        changeColors(shape -> {
+            if (shape instanceof SText) {
+                return null;
+            }
+            ColorAttributes current = currentColor(shape);
+            return new ColorAttributes(state, current.stroked, current.filledColor, current.strokedColor);
+        });
+    }
+
     private void handleMouseDragged(MouseEvent evt) {
         if (boxSelecting) {
             selectionBoxEnd = evt.getPoint();
@@ -84,35 +352,19 @@ public class Controller {
             return;
         }
 
-        boxSelecting = false;
-
         if (resizeMode && resizing && activeHandle != null) {
-            logger.debug("RESIZING with handle {} at ({}, {})", activeHandle, evt.getX(), evt.getY());
             int dx = evt.getX() - resizeOrigin.x;
             int dy = evt.getY() - resizeOrigin.y;
-            logger.debug("About to resize {} shapes, dx={}, dy={}", selection.getSelectedShapes().size(), dx, dy);
             for (Shape shape : selection) {
-                logger.debug("Calling resize on shape: {}", shape);
                 shape.resize(activeHandle, dx, dy);
             }
             resizeOrigin = evt.getPoint();
-        } else if (resizeMode && !selection.isEmpty()) {
-            lastMousePos = evt.getPoint();
-            ResizeHandle handle = getHandleAt(evt.getPoint());
-            if (handle != null) {
-                resizing = true;
-                activeHandle = handle;
-                resizeOrigin = evt.getPoint();
-            }
-        } else {
-            resizing = false;
-            activeHandle = null;
+        } else if (!selection.isEmpty()) {
             if (lastMousePos == null) {
                 lastMousePos = evt.getPoint();
             }
             int dx = evt.getX() - lastMousePos.x;
             int dy = evt.getY() - lastMousePos.y;
-            logger.debug("MOVING shapes with delta ({}, {})", dx, dy);
             for (Shape shape : selection) {
                 shape.translate(dx, dy);
             }
@@ -127,18 +379,17 @@ public class Controller {
             return;
         }
 
-        resizing = false;
-        activeHandle = null;
-        resizeOrigin = null;
-        boxSelecting = false; // Clear box selection mode when clicking
+        resizeDragState();
+        boxSelecting = false;
+        view.setCurrentSelectionBox(null);
 
         if (resizeMode && !selection.isEmpty()) {
             ResizeHandle handle = getHandleAt(evt.getPoint());
-            logger.debug("In resize mode, checking handle at ({}, {}): {}", evt.getX(), evt.getY(), handle);
             if (handle != null) {
                 resizing = true;
                 activeHandle = handle;
                 resizeOrigin = evt.getPoint();
+                beginDrag(evt.getPoint());
                 view.repaint();
                 return;
             }
@@ -151,96 +402,86 @@ public class Controller {
                                 resetSelection();
                             }
                             if (!selection.getSelectedShapes().contains(s)) {
-                                lastMousePos = evt.getPoint();
                                 selection.add(s);
-                                logger.debug("Selecting {}", s);
                             }
+                            beginDrag(evt.getPoint());
                         },
                         () -> {
-                            // Clicked on empty space - start box selection
-                            resetSelection();
+                            additiveBoxSelection = evt.isShiftDown();
+                            if (!additiveBoxSelection) {
+                                resetSelection();
+                            }
                             selectionBoxStart = evt.getPoint();
+                            selectionBoxEnd = evt.getPoint();
                             boxSelecting = true;
+                            dragStartMousePos = null;
+                            dragStartBounds = Map.of();
                         }
                 );
     }
 
-    private void placeTextAt(Point point) {
-        String input = JOptionPane.showInputDialog(view, "Enter text:", "Add text", JOptionPane.PLAIN_MESSAGE);
-        addingText = false;
-        if (input == null) {
-            return;
-        }
-
-        model.add(SText.create(point.x, point.y, input));
-        resetSelection();
+    private void handleMouseReleased(MouseEvent evt) {
+        finishDragCommand();
+        resizeDragState();
+        boxSelecting = false;
+        selectionBoxStart = null;
+        selectionBoxEnd = null;
+        dragStartMousePos = null;
+        dragStartBounds = Map.of();
+        view.setCurrentSelectionBox(null);
         view.repaint();
     }
 
-    public void enterTextMode() {
-        addingText = true;
-    }
+    private void handleKeyPressed(KeyEvent evt) {
+        int modifiers = evt.getModifiersEx();
 
-    private ResizeHandle getHandleAt(Point point) {
-        final int handleSize = 10;
-        for (Shape shape : selection) {
-            Rectangle bounds = shape.getBounds();
-            
-            // Always-present SE corner handle
-            if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
-                point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
-                return ResizeHandle.SE;
-            }
-
-            // Resize handles are only active in resize mode
-            if (resizeMode) {
-                // NW corner
-                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
-                    point.y >= bounds.y - handleSize && point.y <= bounds.y) {
-                    return ResizeHandle.NW;
+        if ((modifiers & InputEvent.CTRL_DOWN_MASK) != 0) {
+            switch (evt.getKeyCode()) {
+                case KeyEvent.VK_Z -> {
+                    if ((modifiers & InputEvent.SHIFT_DOWN_MASK) != 0) {
+                        redo();
+                    } else {
+                        undo();
+                    }
+                    evt.consume();
+                    return;
                 }
-                // NE corner
-                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
-                    point.y >= bounds.y - handleSize && point.y <= bounds.y) {
-                    return ResizeHandle.NE;
+                case KeyEvent.VK_Y -> {
+                    redo();
+                    evt.consume();
+                    return;
                 }
-                // SW corner
-                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
-                    point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
-                    return ResizeHandle.SW;
+                case KeyEvent.VK_C -> {
+                    copySelection();
+                    evt.consume();
+                    return;
                 }
-                // N edge
-                int edgeX = bounds.x + bounds.width / 2 - handleSize / 2;
-                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
-                    point.y >= bounds.y - handleSize && point.y <= bounds.y) {
-                    return ResizeHandle.N;
+                case KeyEvent.VK_X -> {
+                    cutSelection();
+                    evt.consume();
+                    return;
                 }
-                // S edge
-                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
-                    point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
-                    return ResizeHandle.S;
+                case KeyEvent.VK_V -> {
+                    pasteClipboard();
+                    evt.consume();
+                    return;
                 }
-                // W edge
-                int edgeY = bounds.y + bounds.height / 2 - handleSize / 2;
-                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
-                    point.y >= edgeY && point.y <= edgeY + handleSize) {
-                    return ResizeHandle.W;
+                case KeyEvent.VK_G -> {
+                    group();
+                    evt.consume();
+                    return;
                 }
-                // E edge
-                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
-                    point.y >= edgeY && point.y <= edgeY + handleSize) {
-                    return ResizeHandle.E;
+                case KeyEvent.VK_U -> {
+                    ungroup();
+                    evt.consume();
+                    return;
                 }
             }
         }
-        return null;
-    }
 
-    private void handleKeyPressed(KeyEvent evt) {
         switch (evt.getKeyCode()) {
             case KeyEvent.VK_R -> toggleResizeMode();
             case KeyEvent.VK_DELETE -> deleteSelected();
-            case KeyEvent.VK_C -> copySelection();
             case KeyEvent.VK_A -> changeSelectionColor();
             case KeyEvent.VK_H -> exportHtml();
             default -> logger.warn("Pressed unhandled key: {}", evt.getKeyChar());
@@ -264,55 +505,134 @@ public class Controller {
         }
     }
 
-    private void changeSelectionColor(){
-        if (selection == null) {
-            logger.debug("No selection to change color of");
+    private void placeTextAt(Point point) {
+        String input = JOptionPane.showInputDialog(view, "Enter text:", "Add text", JOptionPane.PLAIN_MESSAGE);
+        addingText = false;
+        if (input == null) {
             return;
         }
 
-        for (Shape s : selection) {
-            if (s instanceof SCollection collection) {
-                collection.forEach(shape -> shape.addAttributes(new ColorAttributes(false, true, Color.BLACK, new Color((int) (Math.random() * 0x1000000)))));
-            } else {
-                s.addAttributes(new ColorAttributes(false, true, Color.BLACK, new Color((int) (Math.random() * 0x1000000))));
+        addShape(SText.create(point.x, point.y, input));
+        resetSelection();
+    }
+
+    private ResizeHandle getHandleAt(Point point) {
+        final int handleSize = 10;
+        for (Shape shape : selection) {
+            Rectangle bounds = shape.getBounds();
+
+            if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
+                    point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
+                return ResizeHandle.SE;
+            }
+
+            if (resizeMode) {
+                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
+                        point.y >= bounds.y - handleSize && point.y <= bounds.y) {
+                    return ResizeHandle.NW;
+                }
+                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
+                        point.y >= bounds.y - handleSize && point.y <= bounds.y) {
+                    return ResizeHandle.NE;
+                }
+                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
+                        point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
+                    return ResizeHandle.SW;
+                }
+                int edgeX = bounds.x + bounds.width / 2 - handleSize / 2;
+                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
+                        point.y >= bounds.y - handleSize && point.y <= bounds.y) {
+                    return ResizeHandle.N;
+                }
+                if (point.x >= edgeX && point.x <= edgeX + handleSize &&
+                        point.y >= bounds.y + bounds.height && point.y <= bounds.y + bounds.height + handleSize) {
+                    return ResizeHandle.S;
+                }
+                int edgeY = bounds.y + bounds.height / 2 - handleSize / 2;
+                if (point.x >= bounds.x - handleSize && point.x <= bounds.x &&
+                        point.y >= edgeY && point.y <= edgeY + handleSize) {
+                    return ResizeHandle.W;
+                }
+                if (point.x >= bounds.x + bounds.width && point.x <= bounds.x + bounds.width + handleSize &&
+                        point.y >= edgeY && point.y <= edgeY + handleSize) {
+                    return ResizeHandle.E;
+                }
             }
         }
-
-        view.repaint();
+        return null;
     }
 
-    private void copySelection() {
-        if (selection == null) {
-            logger.debug("No selection to copy");
+    private void changeColors(Function<Shape, ColorAttributes> updater) {
+        Map<Shape, ColorAttributes> before = new LinkedHashMap<>();
+        Map<Shape, ColorAttributes> after = new LinkedHashMap<>();
+        List<Shape> targets = flattenSelection(selection.getSelectedShapes());
+
+        for (Shape shape : targets) {
+            ColorAttributes current = currentColor(shape);
+            if (current == null) {
+                continue;
+            }
+
+            ColorAttributes updated = updater.apply(shape);
+            if (updated == null || sameColor(current, updated)) {
+                continue;
+            }
+
+            before.put(shape, copy(current));
+            after.put(shape, copy(updated));
+        }
+
+        if (before.isEmpty()) {
             return;
         }
 
-        for (Shape shape : selection) {
-            this.model.add(shape.clone());
-        }
-
-        view.repaint();
+        executeAndRefresh(new ChangeColorCommand(before.keySet(), before, after));
     }
 
-    public void deleteSelected() {
-        if (selection == null) return;
-        logger.debug("Deleting selected shape(s)");
-        for (Shape s : selection) {
-            this.model.remove(s);
+    private void beginDrag(Point point) {
+        lastMousePos = point;
+        dragStartMousePos = point;
+        dragStartBounds = captureBounds(selection.getSelectedShapes());
+    }
+
+    private void finishDragCommand() {
+        if (boxSelecting || dragStartBounds.isEmpty()) {
+            return;
         }
-        resetSelection();
+
+        List<Shape> selectedShapes = selection.getSelectedShapes();
+        if (selectedShapes.isEmpty()) {
+            return;
+        }
+
+        if (resizing && boundsChanged(selectedShapes, dragStartBounds)) {
+            Map<Shape, Rectangle> afterBounds = captureBounds(selectedShapes);
+            Command command = new ResizeShapeCommand(selectedShapes, dragStartBounds, afterBounds);
+            command.undo();
+            executeAndRefresh(command);
+            return;
+        }
+
+        if (boundsChanged(selectedShapes, dragStartBounds)) {
+            Shape reference = selectedShapes.get(0);
+            Rectangle before = dragStartBounds.get(reference);
+            Rectangle after = reference.getBounds();
+            Command command = new MoveShapeCommand(selectedShapes, after.x - before.x, after.y - before.y);
+            command.undo();
+            executeAndRefresh(command);
+        }
+    }
+
+    private void executeAndRefresh(Command command) {
+        commandHistory.execute(command);
+        onModelChanged.run();
         view.repaint();
     }
 
     private void resetSelection() {
-        logger.debug("Resetting selection");
         selection.clear();
     }
 
-    public void addSelectionChangeListener(SelectionListener listener) {
-        selection.addListener(listener);
-    }
-
     private Optional<Shape> getTarget(MouseEvent evt, SCollection sc) {
         return sc.stream()
                 .filter(s -> s.getBounds().contains(evt.getPoint()))
@@ -328,9 +648,71 @@ public class Controller {
     }
 
     private void updateSelectionFromBox(Rectangle box) {
-        resetSelection();
+        if (!additiveBoxSelection) {
+            resetSelection();
+        }
         model.stream()
                 .filter(s -> s.getBounds().intersects(box))
                 .forEach(selection::add);
     }
+
+    private void resizeDragState() {
+        resizing = false;
+        activeHandle = null;
+        resizeOrigin = null;
+        lastMousePos = null;
+    }
+
+    private Map<Shape, Rectangle> captureBounds(Collection<Shape> shapes) {
+        Map<Shape, Rectangle> bounds = new LinkedHashMap<>();
+        for (Shape shape : shapes) {
+            bounds.put(shape, shape.getBounds());
+        }
+        return bounds;
+    }
+
+    private boolean boundsChanged(Collection<Shape> shapes, Map<Shape, Rectangle> before) {
+        for (Shape shape : shapes) {
+            Rectangle previous = before.get(shape);
+            if (previous != null && !previous.equals(shape.getBounds())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private List<Shape> flattenSelection(Collection<Shape> selectedShapes) {
+        LinkedHashSet<Shape> flattened = new LinkedHashSet<>();
+        for (Shape shape : selectedShapes) {
+            flattenShape(shape, flattened);
+        }
+        return new ArrayList<>(flattened);
+    }
+
+    private void flattenShape(Shape shape, Collection<Shape> flattened) {
+        if (shape instanceof SCollection collection) {
+            collection.forEach(child -> flattenShape(child, flattened));
+            return;
+        }
+        flattened.add(shape);
+    }
+
+    private ColorAttributes currentColor(Shape shape) {
+        return (ColorAttributes) shape.getAttributes(ColorAttributes.ID);
+    }
+
+    private ColorAttributes copy(ColorAttributes attrs) {
+        return new ColorAttributes(attrs.filled, attrs.stroked, attrs.filledColor, attrs.strokedColor);
+    }
+
+    private boolean sameColor(ColorAttributes left, ColorAttributes right) {
+        return left.filled == right.filled
+                && left.stroked == right.stroked
+                && left.filledColor.equals(right.filledColor)
+                && left.strokedColor.equals(right.strokedColor);
+    }
+
+    private Color randomColor() {
+        return new Color((int) (Math.random() * 0x1000000));
+    }
 }