Implement PuzzleController class

src/main/java/me/taako/swt/prog2/controller/PuzzleController.java

@@ -1,4 +1,47 @@
 package me.taako.swt.prog2.controller;
 
+import me.taako.swt.prog2.model.PuzzleModel;
+import me.taako.swt.prog2.view.PuzzleView;
+
+import javax.swing.*;
+import java.util.List;
+import java.util.stream.IntStream;
+
 public class PuzzleController {
-}
+    private final PuzzleModel model;
+    private final PuzzleView view;
+
+    public PuzzleController(PuzzleModel model, PuzzleView view) {
+        this.model = model;
+        this.view = view;
+    }
+
+    public void initController() {
+        List<JButton> buttons = view.getButtons();
+        IntStream.range(0, buttons.size())
+                .forEach(i -> buttons.get(i)
+                        .addActionListener(e -> handleButtonClick(i)));
+    }
+
+    private void handleButtonClick(int index) {
+        int size = model.getSize();
+        int sqrtSize = (int) Math.sqrt(size);
+        int emptyTile = size - 1;
+
+        if (index > 0 && model.getTile(index - 1) == emptyTile) {
+            model.swapTiles(index, index - 1);
+        } else if (index < size - 1 && model.getTile(index + 1) == emptyTile) {
+            model.swapTiles(index, index + 1);
+        } else if (index >= sqrtSize && model.getTile(index - sqrtSize) == emptyTile) {
+            model.swapTiles(index, index - sqrtSize);
+        } else if (index < size - sqrtSize && model.getTile(index + sqrtSize) == emptyTile) {
+            model.swapTiles(index, index + sqrtSize);
+        }
+
+        view.update();
+
+        if (model.isSolved()) {
+            JOptionPane.showMessageDialog(view, "Puzzle gelöst!");
+        }
+    }
+}