GH-995 Add /fireball command (#1103)

Author: Jakubk15

eternalcore-core/src/main/java/com/eternalcode/core/feature/fireball/FireballCommand.java

@@ -0,0 +1,26 @@
+package com.eternalcode.core.feature.fireball;
+
+import com.eternalcode.annotations.scan.command.DescriptionDocs;
+import dev.rollczi.litecommands.annotations.argument.Arg;
+import dev.rollczi.litecommands.annotations.command.Command;
+import dev.rollczi.litecommands.annotations.context.Sender;
+import dev.rollczi.litecommands.annotations.execute.Execute;
+import dev.rollczi.litecommands.annotations.permission.Permission;
+import org.bukkit.entity.Fireball;
+import org.bukkit.entity.Player;
+
+import java.util.Optional;
+
+@Command(name = "fireball")
+@Permission("eternalcore.fireball")
+public class FireballCommand {
+
+    private static final double DEFAULT_SPEED = 2.0D;
+
+    @Execute
+    @DescriptionDocs(description = "Launch a fireball in the direction you are looking", arguments = "[speed]")
+    void execute(@Sender Player sender, @Arg Optional<Double> speed) {
+        double fireballSpeed = speed.orElse(DEFAULT_SPEED);
+        sender.launchProjectile(Fireball.class, sender.getLocation().getDirection().multiply(fireballSpeed));
+    }
+}