Development milestone

src/main/java/plugin/Listeners.java

@@ -2,16 +2,21 @@
 // Author: NotAlexNoyle.
 package plugin;
 
+import java.util.ArrayList;
 // Import required libraries.
 import java.util.List;
 
 import org.bukkit.Bukkit;
 import org.bukkit.Particle;
+import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntitySpawnEvent;
+import org.bukkit.event.player.PlayerInteractEntityEvent;
 
 import com.destroystokyo.paper.event.block.AnvilDamagedEvent;
 import com.destroystokyo.paper.event.block.AnvilDamagedEvent.DamageState;
@@ -44,40 +49,126 @@ public class Listeners implements Listener {
 
 	}
 
-	// Listen for entities being harmed.
+	// Listen for entities being spawned.
 	@EventHandler(priority = EventPriority.HIGHEST)
 	public void onEntityDamage(EntityDamageEvent event) {
 
-		// If the entity that was harmed is an end crystal, and it is in the spawn region, do this...
+		// If the entity that was spawned is an end crystal, and it is in the spawn region, do this...
 		if(isInSpawnRegion(BukkitAdapter.adapt(event.getEntity().getLocation())) && event.getEntityType().equals(EntityType.ENDER_CRYSTAL)) {
 
-			// Spawn a particle to indicate the temporary deleted state of an end crystal.
-			event.getEntity().getLocation().getWorld().spawnParticle(Particle.SPELL, event.getEntity().getLocation(), 5);
-
 			// Wait a few seconds.
 			Bukkit.getScheduler().runTaskLater(HolyGrailOG.getPlugin(), new Runnable() {
 				// Run a scheduled task.
 				@Override
 				public void run() {
 
-					// Spawn particles to indicate the end crystal being restored.
-					event.getEntity().getLocation().getWorld().spawnParticle(Particle.SPELL, event.getEntity().getLocation(), 5);
-					
 					// Restore the end crystal to its original location.
 					event.getEntity().getWorld().spawnEntity(event.getEntity().getLocation(), EntityType.ENDER_CRYSTAL);
 
 				}
-			// Declare amount of ticks to wait (20L = 1 tick)
+				// Declare amount of ticks to wait (20L = 1 tick).
 			}, 100L);
 
 		}
+		// TODO: Attempt to always cancel damage in duels arenas.
+		else {
+
+			if(event.getEntity().getType().equals(EntityType.ENDER_CRYSTAL)){
+
+				event.setCancelled(false);
+
+			}
+
+		}
+
+	}
+
+	// TODO: Complete the mechanism for staff to intentionally delete crystals.
+	// Listen for a player interacting with a block or entity.
+	@EventHandler(priority = EventPriority.HIGHEST)
+	public void onEntityInteract(PlayerInteractEntityEvent event) {
+
+		// Get the nature of the interaction and store it.
+		Entity entityClicked = event.getRightClicked();
+
+		// If the player right clicked on the block or entity, do this...
+		if(entityClicked.getType().equals(EntityType.ENDER_CRYSTAL)) {
+
+			// Get the player who interacted and store them.
+			Player player = event.getPlayer();
+
+			// TODO: Remove dev logger.
+			HolyGrailOG.getPlugin();
+			HolyGrailOG.getPlugin().getLogger().info("Player " + player.getName() + " right clicked an ender crystal.");
+
+		}
+
+	}
+
+	// Listen for entities being spawned.
+	@EventHandler(priority = EventPriority.HIGHEST)
+	public void onEntitySpawn(EntitySpawnEvent event) {
+
+		// If the entity that was spawned is an end crystal, and it is in the spawn region, do this...
+		if(isInSpawnRegion(BukkitAdapter.adapt(event.getLocation())) && event.getEntityType().equals(EntityType.ENDER_CRYSTAL)) {
+
+			// If an end crystal already exists at the location, do this...
+			if(crystalsReasonablyNearby(event.getEntity()).contains("ender_crystal")) {
+
+				// Don't spawn in another crystal since there is one already.
+				event.setCancelled(true);
+
+			}
+			else {
+
+				// Spawn particles to indicate the end crystal being restored.
+				event.getEntity().getWorld().spawnParticle(Particle.SPELL, event.getEntity().getLocation(), 6);
+
+			}
+
+		}
+
+	}
+
+	// TODO: Move crystal finding logic here so its re-usable.
+	private ArrayList<String> crystalsReasonablyNearby(Entity eventEntity) {
+
+		// Make a list of to hold the nearby entities sized of the maximum reasonable amount of nearby entities.
+		List<Entity> entityList = new ArrayList<Entity>(3457);
+		
+		// Make a list of to hold the nearby entity names sized of the maximum reasonable amount of nearby entities.
+		ArrayList<String> entityConverter = new ArrayList<String>(3457);
+
+		// Iterate over the nearby entities with a pre-set maximum.
+		for(int i = 0; i < entityList.size(); i++) {
+
+			// Attempt to run error-throwing code.
+			try {
+
+				// Get a list of nearby crystal entities.
+				entityList.add(eventEntity.getNearbyEntities(2, 2, 2).get(i));
+				entityConverter.add(eventEntity.getNearbyEntities(2, 2, 2).get(i).getType().toString().toLowerCase());
+
+			}
+			// If the amount of entities is less than 3457, this error will be thrown.
+			catch(IndexOutOfBoundsException error) {
+
+				// Stop the loop if maximum entity count was reached. The last value of i will be used as the list size.
+				break;
+
+			}
+
+		}
+
+		// Return the completed entity list.
+		return entityConverter;
 
 	}
 
 	// Declare a function for checking whether a location is in spawn.
 	private boolean isInSpawnRegion(Location worldGuardBlockLocation) {
 
-		// Get the list of regions at the location from the WorldGuard API.
+		// Get the list of regions at the location using the WorldGuard API.
 		WorldGuard.getInstance();
 		RegionContainer container = WorldGuard.getInstance().getPlatform().getRegionContainer();
 		RegionQuery query = container.createQuery();