Improve kill effect (#7148)

* ignores totem and cleans up EffKill

* improve syntax + add example docs

* requested changes!

* requested changes

* requested changes

* oops

* requested changes

* remove ignoring totem & remove setting the player to survival then back to creative

* oopsies

* remove useless imports

* Use damage where possible to trigger death event.

* Update src/main/java/ch/njol/skript/effects/EffKill.java

Co-authored-by: Efnilite <35348263+Efnilite@users.noreply.github.com>

---------

Co-authored-by: cheeezburga <47320303+cheeezburga@users.noreply.github.com>
Co-authored-by: Moderocky <admin@moderocky.com>
Co-authored-by: Efnilite <35348263+Efnilite@users.noreply.github.com>

src/main/java/ch/njol/skript/effects/EffKill.java

@@ -1,6 +1,7 @@
 package ch.njol.skript.effects;
 
 import ch.njol.skript.Skript;
+import ch.njol.skript.bukkitutil.DamageUtils;
 import ch.njol.skript.bukkitutil.HealthUtils;
 import ch.njol.skript.doc.Description;
 import ch.njol.skript.doc.Examples;
@@ -10,73 +11,66 @@
 import ch.njol.skript.lang.Expression;
 import ch.njol.skript.lang.SkriptParser.ParseResult;
 import ch.njol.util.Kleenean;
-import org.bukkit.GameMode;
 import org.bukkit.entity.Damageable;
 import org.bukkit.entity.EnderDragonPart;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Event;
+import org.bukkit.event.entity.EntityDamageEvent;
 import org.jetbrains.annotations.Nullable;
 
-/**
- * @author Peter Güttinger
- */
 @Name("Kill")
 @Description({"Kills an entity.",
 		"Note: This effect does not set the entity's health to 0 (which causes issues), but damages the entity by 100 times its maximum health."})
 @Examples({"kill the player",
 		"kill all creepers in the player's world",
 		"kill all endermen, witches and bats"})
-@Since("1.0")
+@Since("1.0, INSERT VERSION (ignoring totem of undying)")
 public class EffKill extends Effect {
 
+	private static final boolean SUPPORTS_DAMAGE_SOURCE = Skript.classExists("org.bukkit.damage.DamageSource");
+
 	static {
 		Skript.registerEffect(EffKill.class, "kill %entities%");
 	}
-
-	// Absolutely make sure it dies
-	public static final int DAMAGE_AMOUNT = Integer.MAX_VALUE;
-
-	@SuppressWarnings("null")
+
 	private Expression<Entity> entities;
-
-	@SuppressWarnings({"unchecked", "null"})
+
 	@Override
-	public boolean init(final Expression<?>[] exprs, final int matchedPattern, final Kleenean isDelayed, final ParseResult parser) {
-		entities = (Expression<Entity>) exprs[0];
+	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parser) {
+		//noinspection unchecked
+		this.entities = (Expression<Entity>) exprs[0];
 		return true;
 	}
 
 	@Override
-	protected void execute(final Event e) {
-		for (Entity entity : entities.getArray(e)) {
-
-			if (entity instanceof EnderDragonPart) {
-				entity = ((EnderDragonPart) entity).getParent();
-			}
-
-			if (entity instanceof Damageable) {
-				final boolean creative = entity instanceof Player && ((Player) entity).getGameMode() == GameMode.CREATIVE;
-				if (creative) // Set player to survival before applying damage
-					((Player) entity).setGameMode(GameMode.SURVIVAL);
+	protected void execute(Event event) {
+		for (Entity entity : entities.getArray(event)) {
 
-				HealthUtils.damage((Damageable) entity, HealthUtils.getMaxHealth((Damageable) entity) * 100); // just to make sure that it really dies >:)
+			if (entity instanceof EnderDragonPart part)
+				entity = part.getParent();
 
-				if (creative) // Set creative player back to creative
-					((Player) entity).setGameMode(GameMode.CREATIVE);
+			if (entity instanceof Damageable damageable) {
+				if (SUPPORTS_DAMAGE_SOURCE) {
+					EntityDamageEvent.DamageCause cause = EntityDamageEvent.DamageCause.KILL;
+					HealthUtils.damage(damageable, 100 + damageable.getHealth(), DamageUtils.getDamageSourceFromCause(cause));
+				} else {
+					HealthUtils.setHealth(damageable, 0);
+					HealthUtils.damage(damageable, 1);
+				}
 			}
 
 			// if everything done so far has failed to kill this thing
 			// We also don't want to remove a player as this would remove the player's data from the server.
 			if (entity.isValid() && !(entity instanceof Player))
 				entity.remove();
-			
+
 		}
 	}
-	
+
 	@Override
-	public String toString(final @Nullable Event e, final boolean debug) {
-		return "kill" + entities.toString(e, debug);
+	public String toString(@Nullable Event event, boolean debug) {
+		return "kill " + entities.toString(event, debug);
 	}
 
 }