Added waves with 10 seconds interval

source/core/src/main/com/csse3200/game/areas/ForestGameArea.java

@@ -36,11 +36,13 @@ public class ForestGameArea extends GameArea {
   private static final int NUM_GHOSTS = 0;
   private static final int NUM_GRUNTS = 5;
 
-  private static final int NUM_BOSS=4;
+  private static final int NUM_BOSSKING2=2;
+  private static final int NUM_BOSSKING1=2;
 
   private Timer bossSpawnTimer;
   private int bossSpawnInterval = 10000; // 1 minute in milliseconds
-
+  private int wave = 0;
+  private Timer waveTimer;
 
   private static final int NUM_WEAPON_TOWERS = 3;
   private static final GridPoint2 PLAYER_SPAWN = new GridPoint2(0, 0);
@@ -135,6 +137,37 @@ public class ForestGameArea extends GameArea {
   private Entity bossKing1;
   private Entity bossKing2;
 
+  // Add this method to start the wave spawning timer when the game starts.
+  private void startWaveTimer() {
+    waveTimer = new Timer();
+    waveTimer.scheduleAtFixedRate(new TimerTask() {
+      @Override
+      public void run() {
+        spawnWave();
+      }
+    }, 0, 10000); // 10000 milliseconds = 10 seconds
+  }
+
+  // Add this method to stop the wave timer when the game ends or as needed.
+  private void stopWaveTimer() {
+    if (waveTimer != null) {
+      waveTimer.cancel();
+      waveTimer = null;
+    }
+  }
+
+  private void spawnWave() {
+    wave++;
+      switch (wave) {
+          case 1, 2 -> spawnXenoGrunts();
+          case 3 -> spawnBossKing1();
+          case 4 -> spawnBossKing2();
+          default -> {
+          }
+          // Handle other wave scenarios if needed
+      }
+  }
+
 
   /**
    * Initialise this ForestGameArea to use the provided TerrainFactory.
@@ -166,8 +199,7 @@ public void create() {
     spawnGhosts();
     spawnWeaponTower();
     spawnEngineer();
-    bossKing1 = spawnBossKing1();
-    bossKing2 = spawnBossKing2();
+    startWaveTimer();
     spawnTNTTower();
   }
 
@@ -267,10 +299,15 @@ private void spawnGhosts() {
   private Entity spawnBossKing1() {
     int[] pickedLanes = new Random().ints(0, 8)
             .distinct().limit(5).toArray();
-    GridPoint2 randomPos = new GridPoint2(19, pickedLanes[0]);
-    Entity ghostKing = NPCFactory.createGhostKing(player);
-    spawnEntityAt(ghostKing, randomPos, true, true);
-    return ghostKing;
+    for (int i = 0; i < NUM_BOSSKING1; i++) {
+      GridPoint2 randomPos = new GridPoint2(19, pickedLanes[i]);
+      bossKing1 = BossKingFactory.createBossKing1(player);
+      spawnEntityAt(bossKing1,
+              randomPos,
+              true,
+              false);
+    }
+    return bossKing1;
   }
 
     /**
@@ -362,7 +399,7 @@ private Entity spawnBossKing2() {
     int[] pickedLanes = new Random().ints(0, 8)
             .distinct().limit(5).toArray();
 
-    for (int i = 0; i < NUM_BOSS; i++) {
+    for (int i = 0; i < NUM_BOSSKING2; i++) {
       GridPoint2 randomPos = new GridPoint2(19, pickedLanes[i]);
       bossKing2 = BossKingFactory.createBossKing2(player);
       spawnEntityAt(bossKing2,
@@ -470,6 +507,7 @@ public void dispose() {
     super.dispose();
     ServiceLocator.getResourceService().getAsset(backgroundMusic, Music.class).stop();
     this.unloadAssets();
+    stopWaveTimer();
   }
 
   private void spawnScrap() {