feat: OrbitSpell "interactions"

core/src/main/java/com/nisovin/magicspells/spells/targeted/OrbitSpell.java

@@ -1,8 +1,6 @@
 package com.nisovin.magicspells.spells.targeted;
 
-import java.util.Map;
-import java.util.Set;
-import java.util.HashSet;
+import java.util.*;
 import java.util.function.Predicate;
 
 import org.bukkit.Location;
@@ -11,15 +9,16 @@
 import org.bukkit.entity.ArmorStand;
 import org.bukkit.entity.LivingEntity;
 
+import com.nisovin.magicspells.util.*;
 import io.papermc.paper.entity.TeleportFlag;
 
-import com.nisovin.magicspells.util.*;
 import com.nisovin.magicspells.Subspell;
 import com.nisovin.magicspells.MagicSpells;
 import com.nisovin.magicspells.spells.TargetedSpell;
 import com.nisovin.magicspells.util.config.ConfigData;
 import com.nisovin.magicspells.events.SpellTargetEvent;
 import com.nisovin.magicspells.spelleffects.SpellEffect;
+import com.nisovin.magicspells.util.trackers.Interaction;
 import com.nisovin.magicspells.spells.TargetedEntitySpell;
 import com.nisovin.magicspells.spelleffects.EffectPosition;
 import com.nisovin.magicspells.spells.TargetedLocationSpell;
@@ -59,6 +58,9 @@ public class OrbitSpell extends TargetedSpell implements TargetedEntitySpell, Ta
 	private final String groundSpellName;
 	private final String entitySpellName;
 
+	private final List<?> interactionData;
+	private List<Interaction> interactions;
+
 	private Subspell orbitSpell;
 	private Subspell groundSpell;
 	private Subspell entitySpell;
@@ -94,6 +96,8 @@ public OrbitSpell(MagicConfig config, String spellName) {
 		orbitSpellName = getConfigString("spell", "");
 		groundSpellName = getConfigString("spell-on-hit-ground", "");
 		entitySpellName = getConfigString("spell-on-hit-entity", "");
+
+		interactionData = getConfigList("interactions", null);
 	}
 
 	@Override
@@ -110,6 +114,9 @@ public void initialize() {
 		entitySpell = initSubspell(entitySpellName,
 				error.formatted("spell-on-hit-entity"),
 				true);
+
+		if (interactionData == null || interactionData.isEmpty()) return;
+		interactions = Interaction.read(this, interactionData);
 	}
 
 	@Override
@@ -177,6 +184,7 @@ public void removeOrbits(LivingEntity target) {
 	private class OrbitTracker implements Runnable {
 
 		private SpellData data;
+		private boolean stopped = false;
 
 		private final BoundingBox box;
 		private final Vector currentDirection;
@@ -335,6 +343,47 @@ public void run() {
 					return;
 				}
 			}
+
+			if (interactions == null || interactions.isEmpty()) return;
+			Set<OrbitTracker> toRemove = new HashSet<>();
+			Set<OrbitTracker> trackers = new HashSet<>(trackerSet);
+			for (OrbitTracker collisionTracker : trackers) {
+				for (Interaction interaction : interactions) {
+					if (!canInteractWith(collisionTracker)) continue;
+					if (!interaction.interactsWith().check(collisionTracker.getOrbitSpell())) continue;
+
+					if (interaction.canInteractList() != null && !interaction.canInteractList().canTarget(data.caster(), collisionTracker.data.caster()))
+						continue;
+
+					if (interaction.collisionSpell() != null) {
+						Location middleLoc = currentLocation.clone().add(collisionTracker.currentLocation).multiply(0.5);
+						interaction.collisionSpell().subcast(data.retarget(null, middleLoc));
+					}
+
+					if (interaction.stopCausing()) {
+						toRemove.add(collisionTracker);
+						collisionTracker.stop(false);
+					}
+
+					if (interaction.stopWith()) {
+						toRemove.add(this);
+						stop(false);
+					}
+				}
+			}
+
+			trackerSet.removeAll(toRemove);
+			toRemove.clear();
+			trackers.clear();
+		}
+
+		private boolean canInteractWith(OrbitTracker collisionTracker) {
+			if (collisionTracker == null) return false;
+			if (stopped || collisionTracker.stopped) return false;
+			if (!data.hasCaster() || !collisionTracker.data.hasCaster()) return false;
+			if (collisionTracker.equals(this)) return false;
+			if (!collisionTracker.currentLocation.getWorld().equals(currentLocation.getWorld())) return false;
+			return collisionTracker.box.contains(currentLocation) || box.contains(collisionTracker.currentLocation);
 		}
 
 		private OrbitSpell getOrbitSpell() {
@@ -364,6 +413,7 @@ private void move() {
 		}
 
 		private void stop(boolean removeTracker) {
+			stopped = true;
 			playSpellEffects(EffectPosition.DELAYED, currentLocation, data);
 
 			MagicSpells.cancelTask(taskId);