Force field fling on teleport

src/main/java/world/bentobox/bentobox/Settings.java

@@ -143,6 +143,15 @@ public class Settings implements ConfigObject {
     @ConfigEntry(path = "general.fakeplayers", experimental = true)
     private Set<String> fakePlayers = new HashSet<>();
 
+    @ConfigComment("Flingback power. How far hostile mobs will be flung back when a player teleports into them.")
+    @ConfigComment("2.5 will push back a number of blocks, 5 will throw them far, 1 will not do much.")
+    @ConfigEntry(path = "general.flingback")
+    private double flingback = 2.5D;
+
+    @ConfigComment("Kill mobs on teleport. If the world flag in Admin Settings is set, then they will be killed/removed instead of flung.")
+    @ConfigEntry(path = "general.teleport-remove-mobs")
+    private boolean teleportRemoveMobs = false;
+
     /* PANELS */
     @ConfigComment("Panel click cooldown. Value is in milliseconds. Prevents players spamming button presses in GUIs.")
     @ConfigEntry(path = "panel.click-cooldown-ms")
@@ -1040,6 +1049,34 @@ public void setSafeSpotSearchRange(int safeSpotSearchRange) {
         this.safeSpotSearchRange = safeSpotSearchRange;
     }
 
+    /**
+     * @return the flingback
+     */
+    public double getFlingback() {
+        return flingback;
+    }
+
+    /**
+     * @param flingback the flingback to set
+     */
+    public void setFlingback(double flingback) {
+        this.flingback = flingback;
+    }
+
+    /**
+     * @return the teleportRemoveMobs
+     */
+    public boolean isTeleportRemoveMobs() {
+        return teleportRemoveMobs;
+    }
+
+    /**
+     * @param teleportRemoveMobs the teleportRemoveMobs to set
+     */
+    public void setTeleportRemoveMobs(boolean teleportRemoveMobs) {
+        this.teleportRemoveMobs = teleportRemoveMobs;
+    }
+
     /**
      * @return an immutable list of readyCommands
      */

src/main/java/world/bentobox/bentobox/managers/IslandsManager.java

@@ -11,6 +11,7 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Queue;
+import java.util.Random;
 import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
@@ -20,6 +21,7 @@
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.Material;
+import org.bukkit.Sound;
 import org.bukkit.Tag;
 import org.bukkit.World;
 import org.bukkit.block.Block;
@@ -71,6 +73,7 @@ public class IslandsManager {
     private static final String SETSPAWN = "bentobox-setspawn";
 
     private final BentoBox plugin;
+    private final Random rand = new Random();
 
     private final Map<World, Island> spawns = new ConcurrentHashMap<>();
 
@@ -1702,7 +1705,30 @@ public void clearArea(Location loc) {
                 .filter(en -> Util.isHostileEntity(en)
                         && !plugin.getIWM().getRemoveMobsWhitelist(loc.getWorld()).contains(en.getType())
                         && !(en instanceof PufferFish) && ((LivingEntity) en).getRemoveWhenFarAway())
-                .filter(en -> en.customName() == null).forEach(Entity::remove);
+                .filter(en -> en.customName() == null)
+                .forEach(e -> flingOrKill(e, loc));
+    }
+
+    private void flingOrKill(Entity e, Location loc) {
+        if (plugin.getSettings().isTeleportRemoveMobs()) {
+            e.remove();
+            return;
+        }
+        Vector entVec = e.getLocation().toVector();
+        double dist = plugin.getSettings().getFlingback() - entVec.distance(loc.toVector());
+        if (dist < 1) {
+            dist = 1;
+        }
+        Vector direction = entVec.subtract(loc.toVector());
+        if (direction.lengthSquared() < 3) {
+            // On top of us
+            direction.add(new Vector(rand.nextDouble(), 0, rand.nextDouble()));
+        }
+        // Add a bit of lift
+        direction.add(new Vector(0, rand.nextDouble(), 0));
+        direction.multiply(dist);
+        loc.getWorld().playSound(e, Sound.ENTITY_ILLUSIONER_HURT, 1F, 5F);
+        e.setVelocity(direction);
     }
 
     /**

src/main/resources/config.yml

@@ -86,6 +86,10 @@ general:
   # /!\ This feature is experimental and might not work as expected or might not work at all.
   fakeplayers:
   - '[CoFH]'
+  # Flingback power. How far hostile mobs will be flung back when a player teleports into them.
+  flingback: 5.0
+  # Remove mobs on teleport.
+  teleport-remove-mobs: false
 panel:
   # Panel click cooldown. Value is in milliseconds. Prevents players spamming button presses in GUIs.
   click-cooldown-ms: 250

src/main/resources/locales/en-US.yml

@@ -704,7 +704,6 @@ commands:
       home-set: '&6 Your [prefix_island] home has been set to your current location.'
       homes-are: '&6 [prefix_Island] homes are:'
       home-list-syntax: '&6 [name]'
-      click-to-teleport: '&oClick to teleport'
       nether:
         not-allowed: '&c You are not allowed to set your home in the Nether.'
         confirmation: '&c Are you sure you want to set your home in the Nether?'
@@ -1600,9 +1599,9 @@ protection:
       name: Remove end exit [prefix_island]
     REMOVE_MOBS:
       description: |-
-        &a Remove monsters when
-        &a teleporting to [prefix_island]
-      name: Remove monsters
+        &a Push monsters away when
+        &a teleporting to island
+      name: Fling back monsters
     RIDING:
       description: Toggle riding
       name: Animal riding

src/test/java/world/bentobox/bentobox/listeners/PanelListenerManagerTest.java

@@ -165,8 +165,7 @@ public String getTitle() {
         }
 
         @Override
-        public String getOriginalTitle() {
-
+        public String getOriginalTitle() {            
             return "";
         }
 

src/test/java/world/bentobox/bentobox/managers/IslandsManagerTest.java

@@ -6,6 +6,7 @@
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyDouble;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
@@ -33,6 +34,7 @@
 import org.bukkit.Chunk;
 import org.bukkit.Location;
 import org.bukkit.Material;
+import org.bukkit.Sound;
 import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
@@ -50,6 +52,7 @@
 import org.bukkit.entity.Zombie;
 import org.bukkit.permissions.PermissionAttachmentInfo;
 import org.bukkit.scheduler.BukkitScheduler;
+import org.bukkit.util.Vector;
 import org.eclipse.jdt.annotation.NonNull;
 import org.eclipse.jdt.annotation.Nullable;
 import org.junit.jupiter.api.AfterEach;
@@ -190,6 +193,7 @@
         User.setPlugin(plugin);
         // Set up user already
         when(player.getUniqueId()).thenReturn(uuid);
+        when(player.getLocation()).thenReturn(location);
         User.getInstance(player);
 
         // Locales
@@ -219,6 +223,8 @@
         when(location.clone()).thenReturn(location);
         Chunk chunk = mock(Chunk.class);
         when(location.getChunk()).thenReturn(chunk);
+        // Vector
+        when(location.toVector()).thenReturn(new Vector(100D, 120D, 100D));
         when(space1.getRelative(BlockFace.DOWN)).thenReturn(ground);
         when(space1.getRelative(BlockFace.UP)).thenReturn(space2);
         // A safe spot
@@ -297,13 +303,17 @@
         when(cow.getType()).thenReturn(EntityType.COW);
         when(wither.getType()).thenReturn(EntityType.WITHER);
         when(wither.getRemoveWhenFarAway()).thenReturn(true);
+        when(wither.getLocation()).thenReturn(location);
         when(creeper.getType()).thenReturn(EntityType.CREEPER);
         when(creeper.getRemoveWhenFarAway()).thenReturn(true);
+        when(creeper.getLocation()).thenReturn(location);
         when(pufferfish.getType()).thenReturn(EntityType.PUFFERFISH);
+        when(pufferfish.getLocation()).thenReturn(location);
         // Named monster
         when(skelly.getType()).thenReturn(EntityType.SKELETON);
         when(skelly.customName()).thenReturn(Component.text("Skelly"));
         when(skelly.getRemoveWhenFarAway()).thenReturn(true);
+        when(skelly.getLocation()).thenReturn(location);
 
         Collection<Entity> collection = new ArrayList<>();
         collection.add(player);
@@ -970,7 +980,8 @@
      * {@link world.bentobox.bentobox.managers.IslandsManager#clearArea(Location)}.
      */
     @Test
-    void testClearArea() {
+    void testClearAreaRemove() {
+        settings.setTeleportRemoveMobs(true);
         islandsManager.clearArea(location);
         // Only the correct entities should be cleared
         verify(zombie).remove();
@@ -982,6 +993,34 @@
         verify(pufferfish, never()).remove();
         verify(skelly, never()).remove();
     }
+
+    /**
+     * Test method for {@link world.bentobox.bentobox.managers.IslandsManager#clearArea(Location)}.
+     */
+    @Test
+    void testClearArea() {
+        islandsManager.clearArea(location);
+        // Only the correct entities should be flung
+        verify(zombie, never()).remove();
+        verify(player, never()).remove();
+        verify(cow, never()).remove();
+        verify(slime, never()).remove();
+        verify(wither, never()).remove();
+        verify(creeper, never()).remove();
+        verify(pufferfish, never()).remove();
+        verify(skelly, never()).remove();
+
+        verify(zombie).setVelocity(any(Vector.class));
+        verify(slime).setVelocity(any(Vector.class));
+        verify(creeper).setVelocity(any(Vector.class));
+        verify(player, never()).setVelocity(any(Vector.class));
+        verify(cow, never()).setVelocity(any(Vector.class));
+        verify(wither, never()).setVelocity(any(Vector.class));
+        verify(pufferfish, never()).setVelocity(any(Vector.class));
+        verify(skelly, never()).setVelocity(any(Vector.class));
+
+        verify(world).playSound(zombie, Sound.ENTITY_ILLUSIONER_HURT, 1F, 5F);
+    }
 
     /**
      * Test method for