Reimplement wave AI, split out some UI code into a ui module, update TODO

src/main/java/gg/malloc/defense/engine/BombFuse.java

@@ -0,0 +1,30 @@
+package gg.malloc.defense.engine;
+
+public class BombFuse {
+  int m_bombFuseCount = 0;
+  int m_bombFuseTarget = 10;
+
+  public double getProgress() {
+    return Math.max(0.0, Math.min(1.0, (double)m_bombFuseCount / (double)m_bombFuseTarget));
+  }
+
+  public boolean isLit() {
+    return m_bombFuseCount > 0;
+  }
+
+  public boolean isExploded() {
+    return m_bombFuseCount > m_bombFuseTarget;
+  }
+
+  public void reset() {
+    m_bombFuseCount = 0;
+  }
+
+  public void tickLit() {
+    m_bombFuseCount += 1;
+  }
+
+  public void tickDecay() {
+    m_bombFuseCount -= 1;
+  }
+}

src/main/java/gg/malloc/defense/engine/GameRunner.java

@@ -1,30 +1,35 @@
 package gg.malloc.defense.engine;
 
-import gg.malloc.defense.model.Game;
 import gg.malloc.defense.model.Arena;
+import gg.malloc.defense.model.Game;
 import gg.malloc.defense.model.Spawner;
-import gg.malloc.defense.model.Wave;
+
+import gg.malloc.defense.ui.BombCarrier;
+import gg.malloc.defense.ui.BossBars;
 
 import gg.malloc.defense.Plugin;
 
 import java.util.logging.Logger;
+import java.util.ArrayList;
+import java.util.HashSet;
 
 import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.Particle;
 import org.bukkit.Sound;
+import org.bukkit.SoundCategory;
 import org.bukkit.World;
-import org.bukkit.boss.BarColor;
-import org.bukkit.boss.BarStyle;
-import org.bukkit.boss.BossBar;
-import org.bukkit.event.player.PlayerTeleportEvent;
-import org.bukkit.event.entity.EntityTargetEvent;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityTargetEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
 import org.bukkit.entity.Entity;
-import org.bukkit.entity.LivingEntity;
-import org.bukkit.entity.ArmorStand;
 import org.bukkit.entity.EntityType;
+import org.bukkit.Material;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeModifier;
+import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Player;
-import org.bukkit.scheduler.BukkitTask;
 
 public class GameRunner {
   Arena m_arena;
@@ -32,18 +37,11 @@ public class GameRunner {
   Stage m_stage;
   Plugin m_plugin;
 
-  BossBar m_gameBar = Bukkit.createBossBar("Malloc Defense", BarColor.PURPLE, BarStyle.SOLID);
-  BossBar m_waveBar = Bukkit.createBossBar("Malloc Defense", BarColor.PURPLE, BarStyle.SOLID);
-  BossBar m_bombBar = Bukkit.createBossBar("Bomb HP", BarColor.RED, BarStyle.SOLID);
-
-  BukkitTask m_countdownTask;
-
   MobManager m_mobs;
   WaveManager m_waves;
   PlayerManager m_players;
 
-  LivingEntity m_bombTarget = null;
-  int m_bombHP = 100;
+  BombFuse m_bombFuse;
 
   Logger m_log;
 
@@ -55,126 +53,96 @@ public class GameRunner {
     GameOver
   }
 
-  class WaveManager {
-    int m_currentWaveNum = 0;
-    int m_currentBatch = 0;
-    Wave m_currentWave = null;
-    Game m_game;
-
-    WaveManager(Game game) {
-      m_game = game;
-    }
-
-    void reset() {
-      m_currentWaveNum = 0;
-      m_currentBatch = 0;
-      m_currentWave = null;
-    }
-
-    Wave currentWave() {
-      return m_currentWave;
-    }
-
-    int currentWaveNum() {
-      return m_currentWaveNum;
-    }
-
-    int currentBatchNum() {
-      return m_currentBatch;
-    }
-
-    double progress() {
-      return (double)m_currentWaveNum / (double)m_game.getWaveCount();
-    }
-
-    boolean isLastWave() {
-      return m_currentWaveNum >= m_game.getWaveCount();
-    }
-
-    boolean isLastBatch() {
-      return m_currentBatch >= m_currentWave.batchCount();
-    }
-
-    void nextBatch() {
-      m_currentBatch += 1;
-    }
-
-    void next() {
-      m_currentWaveNum += 1;
-      m_currentBatch = 0;
-      m_currentWave = m_game.getWave(m_currentWaveNum);
-    }
-  }
+  TickTask m_fuseTask;
+  TickTask m_countdownTask;
+  TickTask m_bombSmokeTask;
+  TickTask m_bombCrackleTask;
 
+  BossBars m_bars;
 
   public GameRunner(Plugin plugin, Game game, Arena arena) {
     m_plugin = plugin;
     m_game = game;
     m_arena = arena;
     m_stage = Stage.Idle;
-    m_gameBar.setVisible(true);
-    m_waveBar.setVisible(false);
-    m_bombBar.setVisible(false);
-    m_mobs = new MobManager(m_game);
+    m_mobs = new MobManager();
     m_waves = new WaveManager(m_game);
     m_players = new PlayerManager();
+    m_bombFuse = new BombFuse();
+    m_bars = new BossBars(this, m_game, m_waves, m_players, m_bombFuse, m_mobs);
     m_log = m_plugin.getLogger();
+
+    m_fuseTask = new TickTask(m_plugin, () -> {
+      if (m_bombFuse.isLit()) {
+        m_bombFuse.tickDecay();
+        m_bars.update();
+      }
+    }, 80);
+
+    m_countdownTask = new TickTask(m_plugin, () -> {
+      if (m_warmupCountdown == 0) {
+        requestTransition(Stage.Playing);
+      } else {
+        m_bars.update();
+        broadcastMessage("Starting game in " + m_warmupCountdown);
+        m_warmupCountdown--;
+        m_bars.setCountdownProgress((double)m_warmupCountdown / 10.0);
+        m_bars.update();
+      }
+    }, 20);
+
+    m_bombSmokeTask = new TickTask(m_plugin, () -> {
+      Location targetLoc = m_arena.bombTarget().getLocation();
+      m_arena.getWorld().spawnParticle(Particle.SMOKE_LARGE, targetLoc, 35, 4, 2, 4);
+      m_arena.getWorld().spawnParticle(Particle.SMALL_FLAME, targetLoc, 30, 3, 2, 3);
+    }, 5);
+    m_bombCrackleTask = new TickTask(m_plugin, () -> {
+      Location targetLoc = m_arena.bombTarget().getLocation();
+      m_arena.getWorld().playSound(targetLoc, Sound.BLOCK_CAMPFIRE_CRACKLE, SoundCategory.NEUTRAL, 1.0f, 1.0f);
+    }, 35);
   }
 
   int m_warmupCountdown = 0;
 
   public void handleEntityRetargeting(EntityTargetEvent evt) {
-    if (m_mobs.contains(evt.getEntity()) && evt.getReason() == EntityTargetEvent.TargetReason.FORGOT_TARGET) {
-      evt.setTarget(m_bombTarget);
-    }
+    m_mobs.handleEntityRetarget(evt);
   }
 
   public void handleEntityDamage(EntityDamageEvent evt) {
-    if (evt.getEntity() == m_bombTarget && evt instanceof EntityDamageByEntityEvent) {
+    m_mobs.handleEntityDamage(evt);
+    if (m_mobs.bombWasHit()) {
       EntityDamageByEntityEvent entityEvt = (EntityDamageByEntityEvent)evt;
-      if (m_mobs.contains(entityEvt.getDamager())) {
-        entityEvt.getDamager().setGlowing(true);
-        m_bombHP -= 1;
-        broadcastMessage("The bomb has been struck!");
-        m_arena.getWorld().playSound(m_bombTarget.getLocation(), Sound.ENTITY_ZOMBIE_ATTACK_IRON_DOOR, 1.5f, 0.9f);
-        updateMobBars();
-        if (m_bombHP <= 0) {
-          m_arena.getWorld().strikeLightningEffect(m_bombTarget.getLocation());
-          requestTransition(Stage.GameOver);
-        }
+      m_log.info("Target attacked!");
+      entityEvt.getDamager().setGlowing(true);
+      m_bombFuse.tickLit();
+      m_arena.getWorld().playSound(m_arena.bombTarget().getLocation(), Sound.ENTITY_ZOMBIE_ATTACK_IRON_DOOR, 1.5f, 0.9f);
+      m_bars.update();
+      if (m_bombFuse.isExploded()) {
+        m_arena.getWorld().strikeLightningEffect(m_arena.bombTarget().getLocation());
+        m_arena.getWorld().playSound(m_arena.bombTarget().getLocation(), Sound.ENTITY_GENERIC_EXPLODE, SoundCategory.NEUTRAL, 1.3f, 1.0f);
+        m_arena.getWorld().spawnParticle(Particle.EXPLOSION_HUGE, m_arena.bombTarget().getLocation(), 8, 5, 2, 5);
+        requestTransition(Stage.GameOver);
+        m_bombSmokeTask.start();
+        m_bombCrackleTask.start();
+      }
+    } else if (evt.getEntity() instanceof Player) {
+      Player player = (Player)evt.getEntity();
+      if (m_players.contains(player) && player.getHealth() - evt.getFinalDamage() <= 0) {
+        evt.setCancelled(true);
+        handlePlayerDeath(player);
       }
-      evt.setCancelled(true);
-    } else {
-      m_mobs.handleEntityDamage(evt);
-    }
-  }
-
-  private void countdownTick() {
-    if (m_warmupCountdown == 0) {
-      requestTransition(Stage.Playing);
-    } else {
-      updateMobBars();
-      broadcastMessage("Starting game in " + m_warmupCountdown);
-      m_warmupCountdown--;
-      m_countdownTask = m_plugin.getServer().getScheduler().runTaskLater(m_plugin, () -> {
-        countdownTick();
-      }, 20);
     }
   }
 
   private boolean enterIdle() {
-    m_bombHP = 100;
+    m_bombFuse.reset();
     m_waves.reset();
     m_mobs.clear();
+    m_bombSmokeTask.stop();
+    m_bombCrackleTask.stop();
     m_players.requestTransitionForAll(PlayerManager.State.Idle);
-    if (m_bombTarget != null) {
-      m_bombTarget.remove();
-      m_bombTarget = null;
-    }
-    if (m_countdownTask != null) {
-      m_countdownTask.cancel();
-      m_countdownTask = null;
-    }
+    m_fuseTask.stop();
+    m_countdownTask.stop();
     return true;
   }
 
@@ -204,25 +172,22 @@ public class GameRunner {
 
   private boolean enterCountdown() {
     m_warmupCountdown = 10;
-    countdownTick();
+    m_bars.setCountdownProgress(1.0);
+    m_countdownTask.start();
     return true;
   }
 
   private boolean enterPlaying() {
     m_log.info("Starting wave " + m_waves.currentWaveNum());
-    if (m_bombTarget == null) {
-      m_bombTarget = (LivingEntity)m_arena.getWorld().spawnEntity(m_arena.bombTarget().getLocation(), EntityType.ARMOR_STAND);
-    }
-    ArmorStand bombStand = (ArmorStand)m_bombTarget;
-    bombStand.setCustomName("Bomb Target");
-    bombStand.setVisible(true);
-    bombStand.setCustomNameVisible(true);
-    bombStand.setGlowing(true);
+    m_mobs.spawnTarget(m_arena.bombTarget().getLocation());
+    // TODO: Set helmet with custom model data
     for(Player p : m_players.getPlayers()) {
         if (m_players.requestTransition(p, PlayerManager.State.Playing)) {
           p.teleport(m_arena.getWorld().getSpawnLocation(), PlayerTeleportEvent.TeleportCause.PLUGIN);
         }
     }
+    m_countdownTask.stop();
+    m_fuseTask.start();
     spawnNextBatch();
     broadcastTitle("Wave " + m_waves.currentWaveNum());
     return true;
@@ -230,80 +195,28 @@ public class GameRunner {
   
   private boolean enterGameOver() {
     broadcastTitle("Game Over!");
-    if (m_countdownTask != null) {
-      m_countdownTask.cancel();
-      m_countdownTask = null;
-    }
+    broadcastMessage("The bomb blew up!");
+    m_countdownTask.stop();
+    m_fuseTask.stop();
     m_mobs.clear();
-    for(Player p : m_players.getPlayers()) {
+    for(Player p : new ArrayList<Player>(m_players.getPlayers())) {
       removePlayer(p);
     }
     return true;
   }
 
-  private void updateMobBars() {
-    m_gameBar.setVisible(true);
-    switch(m_stage) {
-      case Idle:
-        m_gameBar.setProgress(1.0);
-        m_gameBar.setTitle("Waiting for players...");
-        m_gameBar.setColor(BarColor.PURPLE);
-        m_waveBar.setVisible(false);
-        m_bombBar.setVisible(false);
-        break;
-      case Warmup:
-        m_gameBar.setProgress(m_waves.progress());
-        m_gameBar.setTitle("Wave " + m_waves.currentWaveNum() + " / " + m_game.getWaveCount());
-        m_gameBar.setColor(BarColor.PURPLE);
-        m_waveBar.setVisible(true);
-        m_waveBar.setColor(BarColor.BLUE);
-        m_waveBar.setTitle("Warmup - Waiting for players to get ready...");
-        m_waveBar.setProgress(m_players.readyProgress());
-        m_bombBar.setVisible(false);
-        break;
-      case Countdown:
-        m_gameBar.setProgress(m_waves.progress());
-        m_gameBar.setTitle("Wave " + m_waves.currentWaveNum() + " / " + m_game.getWaveCount());
-        m_gameBar.setColor(BarColor.PURPLE);
-        m_waveBar.setVisible(true);
-        m_waveBar.setColor(BarColor.YELLOW);
-        m_waveBar.setTitle("Wave starting!");
-        m_waveBar.setProgress((double)m_warmupCountdown / (double)10);
-        m_bombBar.setVisible(false);
-        break;
-      case Playing:
-        m_gameBar.setProgress(m_waves.progress());
-        m_gameBar.setTitle("Wave " + m_waves.currentWaveNum() + " / " + m_game.getWaveCount());
-        m_gameBar.setColor(BarColor.PURPLE);
-        if (m_mobs.createdMobs() > 0) {
-          m_waveBar.setVisible(true);
-          m_waveBar.setColor(BarColor.GREEN);
-          m_waveBar.setTitle("Mobs remaining: " + m_mobs.remainingMobs());
-          m_waveBar.setProgress(m_mobs.progress());
-        } else {
-          m_waveBar.setVisible(false);
-        }
-        m_bombBar.setVisible(true);
-        m_bombBar.setProgress((double)m_bombHP / (double)100);
-        break;
-      case GameOver:
-        m_gameBar.setColor(BarColor.RED);
-        m_gameBar.setProgress(1.0);
-        m_gameBar.setTitle("Game Over!");
-        m_waveBar.setVisible(false);
-        m_bombBar.setVisible(false);
-        break;
-    }
+  public Stage getStage() {
+    return m_stage;
   }
 
   private void spawnNextBatch() {
     broadcastMessage("Spawning batch " + m_waves.currentBatchNum());
-    Spawner spawner = new GameSpawner(m_arena, m_mobs, m_players, m_bombTarget);
+    Spawner spawner = new GameSpawner(m_arena, m_mobs, m_players);
     m_waves.currentWave().spawnBatch(spawner, m_waves.currentBatchNum());
-    updateMobBars();
+    m_bars.update();
   }
 
-  public void handlePlayerDeath(Player player) {
+  private void handlePlayerDeath(Player player) {
     if (m_players.requestTransition(player, PlayerManager.State.Dead)) {
       m_arena.getWorld().strikeLightningEffect(player.getLocation());
       if (!m_players.isAnyoneAlive()) {
@@ -316,9 +229,9 @@ public class GameRunner {
   }
 
   public void handleEntityDeath(Entity entity) {
+    boolean wasCarrier = m_mobs.isBombCarrier(entity);
     if (m_mobs.killMob(entity)) {
-      broadcastMessage("Killed game entity " + entity);
-      updateMobBars();
+      m_bars.update();
       if (m_mobs.remainingMobs() <= 3) {
         m_log.info("Starting next batch!");
         if (m_waves.isLastBatch()) {
@@ -381,7 +294,7 @@ public class GameRunner {
     if (attemptTransition(stage)) {
       m_log.info("Game transition: " + m_stage + " -> " + stage);
       m_stage = stage;
-      updateMobBars();
+      m_bars.update();
       return true;
     }
     m_log.severe("Failed to complete transition: " + m_stage + " -> " + stage);
@@ -389,10 +302,11 @@ public class GameRunner {
   }
 
   public void addPlayer(Player p) {
+    if (m_players.contains(p)) {
+      return;
+    }
     m_players.addPlayer(p);
-    m_gameBar.addPlayer(p);
-    m_waveBar.addPlayer(p);
-    m_bombBar.addPlayer(p);
+    m_bars.addPlayer(p);
     if (m_stage == Stage.Idle || m_stage == Stage.Warmup) {
       if (m_players.requestTransition(p, PlayerManager.State.Playing)) {
         p.teleport(m_arena.getWorld().getSpawnLocation(), PlayerTeleportEvent.TeleportCause.PLUGIN);
@@ -405,8 +319,7 @@ public class GameRunner {
   }
 
   public void removePlayer(Player p) {
-    m_gameBar.removePlayer(p);
-    m_waveBar.removePlayer(p);
+    m_bars.removePlayer(p);
     m_players.removePlayer(p);
     if (m_players.isEmpty()) {
       requestTransition(Stage.Idle);
@@ -429,8 +342,4 @@ public class GameRunner {
       p.sendMessage(string);
     }
   }
-
-  void registerSpawnedMob(Entity entity) {
-    m_mobs.addEntity(entity);
-  }
 }

src/main/java/gg/malloc/defense/engine/GameSpawner.java

@@ -8,32 +8,44 @@ import org.bukkit.entity.Entity;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Mob;
+import org.bukkit.inventory.EntityEquipment;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.Material;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeModifier;
 
 public class GameSpawner implements Spawner {
   Arena m_arena;
   MobManager m_manager;
   PlayerManager m_players;
-  LivingEntity m_bombTarget;
   int m_spawnIdx = 0;
 
-  public GameSpawner(Arena arena, MobManager manager, PlayerManager players, LivingEntity bombTarget) {
+  public GameSpawner(Arena arena, MobManager manager, PlayerManager players) {
     m_arena = arena;
     m_manager = manager;
     m_players = players;
-    m_bombTarget = bombTarget;
   }
 
   @Override
-  public Entity spawnMob(EntityType type) {
+  public LivingEntity spawnBombCarrier(EntityType type) {
+    if (m_manager.bombCount() == 0) {
+      return m_manager.addBombCarrier(spawnMob(type));
+    } else {
+      return spawnMob(type);
+    }
+  }
+
+  @Override
+  public LivingEntity spawnMob(EntityType type) {
     Spawnpoint[] spawnpoints = m_arena.spawnpoints();
     m_spawnIdx %= spawnpoints.length;
     //m_log.fine("Spawning " + type + " at " + spawnpoints[m_spawnIdx]);
     Entity newMob = m_arena.getWorld().spawnEntity(spawnpoints[m_spawnIdx].getLocation(), type);
     LivingEntity livingMob = (LivingEntity)newMob;
     livingMob.setRemoveWhenFarAway(false);
-    m_manager.addEntity(newMob);
+    m_manager.addEntity(livingMob);
     m_spawnIdx += 1;
-    ((Mob)newMob).setTarget(m_bombTarget);
-    return newMob;
+    return livingMob;
   }
 }

src/main/java/gg/malloc/defense/engine/MobManager.java

@@ -2,48 +2,61 @@ package gg.malloc.defense.engine;
 
 import java.util.HashSet;
 
+import org.bukkit.Location;
+import org.bukkit.entity.ArmorStand;
 import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Mob;
 import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityTargetEvent;
 
 import gg.malloc.defense.model.Game;
 
+import gg.malloc.defense.ui.BombCarrier;
+
 public class MobManager {
-  HashSet<Entity> m_livingMobs = new HashSet<>();
+  HashSet<LivingEntity> m_livingMobs = new HashSet<>();
+  HashSet<LivingEntity> m_bombCarriers = new HashSet<>();
+  HashSet<LivingEntity> m_droppedBombs = new HashSet<>();
+
   int m_createdMobs = 0;
   int m_killedMobs = 0;
 
-  Game m_game;
-
-  MobManager(Game game) {
-    m_game = game;
-  }
-
-  public void handleEntityDamage(EntityDamageEvent evt) {
-    Entity entity = evt.getEntity();
-    //m_log.info("Damage " + entity);
-    //m_log.info("Living Mobs " + m_livingMobs);
-    if (m_livingMobs.contains(entity)) {
-      m_game.onMobDamaged(entity);
-    }
-  }
-
   public boolean contains(Entity entity) {
     return m_livingMobs.contains(entity);
   }
 
+  public boolean isBombCarrier(Entity entity) {
+    return m_bombCarriers.contains(entity);
+  }
+
   public boolean killMob(Entity entity) {
     if (m_livingMobs.contains(entity)) {
       m_killedMobs += 1;
+      if (m_bombCarriers.remove(entity)) {
+        dropBomb(entity.getLocation());
+      }
       return m_livingMobs.remove(entity);
     }
     return false;
   }
 
   public void clear() {
-    for(Entity e : m_livingMobs) {
+    for(LivingEntity e : m_livingMobs) {
       e.remove();
     }
+    for(LivingEntity e : m_droppedBombs) {
+      e.remove();
+    }
+    if (m_bombTarget != null) {
+      m_bombTarget.remove();
+    }
+    m_bombTarget = null;
+    m_droppedBombs.clear();
     m_livingMobs.clear();
+    m_bombCarriers.clear();
     m_createdMobs = 0;
     m_killedMobs = 0;
   }
@@ -64,13 +77,106 @@ public class MobManager {
     return (double)m_killedMobs / (double)m_createdMobs;
   }
 
-  public void addEntity(Entity entity) {
-    //m_log.fine("Registered new mob " + entity); 
+  public void addEntity(LivingEntity entity) {
     m_livingMobs.add(entity);
+    Mob asMob = (Mob)entity;
+    if (m_droppedBombs.size() > 0) {
+      asMob.setTarget(m_droppedBombs.iterator().next());
+    } else {
+      asMob.setTarget(m_bombTarget);
+    }
     m_createdMobs += 1;
   }
 
+  public int bombCount() {
+    return m_bombCarriers.size() + m_droppedBombs.size();
+  }
+
+  public LivingEntity addBombCarrier(LivingEntity entity) {
+    m_bombCarriers.add(entity);
+    ((Mob)entity).setTarget(m_bombTarget);
+    return new BombCarrier(entity).inHand();
+  }
+
+  public void removeBombCarrier(LivingEntity entity) {
+    m_bombCarriers.remove(entity);
+  }
+
   public boolean empty() {
     return m_livingMobs.size() == 0;
   }
+
+  public LivingEntity dropBomb(Location location) {
+    ArmorStand droppedBomb = (ArmorStand)(new BombCarrier((LivingEntity)location.getWorld().spawnEntity(location, EntityType.ARMOR_STAND)).onHead());
+    droppedBomb.setCustomName("The Bomb");
+    droppedBomb.setVisible(true);
+    droppedBomb.setCustomNameVisible(true);
+    droppedBomb.setGlowing(true);
+    m_droppedBombs.add(droppedBomb);
+    for(LivingEntity ent : m_livingMobs) {
+      if (!m_bombCarriers.contains(ent)) {
+        ((Mob)ent).setTarget(droppedBomb);
+      }
+    }
+    return droppedBomb;
+  }
+
+  boolean m_bombWasHit = false;
+
+  public boolean bombWasHit() {
+    return m_bombWasHit;
+  }
+
+  public void handleEntityDamage(EntityDamageEvent evt) {
+    Entity entity = evt.getEntity();
+    m_bombWasHit = false;
+
+    if (entity == m_bombTarget && evt instanceof EntityDamageByEntityEvent) {
+      EntityDamageByEntityEvent entityEvt = (EntityDamageByEntityEvent)evt;
+      evt.setCancelled(true);
+      if (m_bombCarriers.contains(entityEvt.getDamager())) {
+        m_bombWasHit = true;
+      }
+    } if (m_droppedBombs.contains(entity)) {
+      evt.setCancelled(true);
+      EntityDamageByEntityEvent entityEvt = (EntityDamageByEntityEvent)evt;
+      if (m_livingMobs.contains(entityEvt.getDamager())) {
+        evt.getEntity().remove();
+        m_droppedBombs.remove(evt.getEntity());
+        addBombCarrier((LivingEntity)entityEvt.getDamager());
+        for(LivingEntity ent : m_livingMobs) {
+          if (!m_bombCarriers.contains(ent)) {
+            ((Mob)ent).setTarget(m_bombTarget);
+          }
+        }
+      }
+    } else if (m_livingMobs.contains(evt.getEntity())) {
+      //m_game.onMobDamaged(evt.getEntity());
+    }
+  }
+
+  LivingEntity m_bombTarget;
+
+  public LivingEntity spawnTarget(Location location) {
+    assert(m_bombTarget == null);
+    m_bombTarget = (LivingEntity)location.getWorld().spawnEntity(location, EntityType.ARMOR_STAND);
+    ArmorStand bombStand = (ArmorStand)m_bombTarget;
+    bombStand.setCustomName("Bomb Target");
+    bombStand.setVisible(true);
+    bombStand.setCustomNameVisible(true);
+    bombStand.setGlowing(true);
+    return m_bombTarget;
+  }
+
+  public void handleEntityRetarget(EntityTargetEvent evt) {
+    if (m_livingMobs.contains(evt.getEntity())) {
+      if (m_bombCarriers.contains(evt.getEntity())) {
+        evt.setTarget(m_bombTarget);
+      } if (m_droppedBombs.size() > 0) {
+        evt.setTarget(m_droppedBombs.iterator().next());
+      } else if (evt.getReason() == EntityTargetEvent.TargetReason.FORGOT_TARGET) {
+        evt.setTarget(m_bombTarget);
+      }
+    }
+  }
 }

src/main/java/gg/malloc/defense/engine/PlayerManager.java

@@ -27,6 +27,10 @@ public class PlayerManager {
     return allSuccess;
   }
 
+  public boolean contains(Player player) {
+    return m_playerStates.containsKey(player);
+  }
+
   public boolean requestTransition(Player player, State toState) {
     State currentState = m_playerStates.get(player);
     if (currentState == toState) {

src/main/java/gg/malloc/defense/engine/TickTask.java

@@ -0,0 +1,40 @@
+package gg.malloc.defense.engine;
+
+import gg.malloc.defense.Plugin;
+import org.bukkit.scheduler.BukkitTask;
+
+public class TickTask {
+  Runnable m_runnable;
+  int m_interval;
+  BukkitTask m_task = null;
+  Plugin m_plugin;
+  boolean m_cancelled = false;
+
+  public TickTask(Plugin plugin, Runnable runnable, int interval) {
+    m_plugin = plugin;
+    m_runnable = runnable;
+    m_interval = interval;
+  }
+
+  public void start() {
+    m_cancelled = false;
+    if (m_task == null) {
+      tick();
+    }
+  }
+
+  private void tick() {
+    m_runnable.run();
+    if (!m_cancelled) {
+      m_task = m_plugin.getServer().getScheduler().runTaskLater(m_plugin, () -> {tick();}, m_interval);
+    }
+  }
+
+  void stop() {
+    m_cancelled = true;
+    if (m_task != null) {
+      m_task.cancel();
+      m_task = null;
+    }
+  }
+}

src/main/java/gg/malloc/defense/engine/WaveManager.java

@@ -0,0 +1,55 @@
+package gg.malloc.defense.engine;
+
+import gg.malloc.defense.model.Wave;
+import gg.malloc.defense.model.Game;
+
+public class WaveManager {
+  int m_currentWaveNum = 0;
+  int m_currentBatch = 0;
+  Wave m_currentWave = null;
+  Game m_game;
+
+  public WaveManager(Game game) {
+    m_game = game;
+  }
+
+  public void reset() {
+    m_currentWaveNum = 0;
+    m_currentBatch = 0;
+    m_currentWave = null;
+  }
+
+  public Wave currentWave() {
+    return m_currentWave;
+  }
+
+  public int currentWaveNum() {
+    return m_currentWaveNum;
+  }
+
+  public int currentBatchNum() {
+    return m_currentBatch;
+  }
+
+  public double progress() {
+    return (double)m_currentWaveNum / (double)m_game.getWaveCount();
+  }
+
+  public boolean isLastWave() {
+    return m_currentWaveNum >= m_game.getWaveCount();
+  }
+
+  public boolean isLastBatch() {
+    return m_currentBatch >= m_currentWave.batchCount();
+  }
+
+  public void nextBatch() {
+    m_currentBatch += 1;
+  }
+
+  public void next() {
+    m_currentWaveNum += 1;
+    m_currentBatch = 0;
+    m_currentWave = m_game.getWave(m_currentWaveNum);
+  }
+}