package com.gnarly.engine.utils;

import org.joml.Vector3f;

public class RHitbox {

	private Vector3f center, halfExtent;
	
	public RHitbox(float x, float y, float width, float height) {
		center = new Vector3f(x + width / 2, y + height / 2, 0);
		halfExtent = new Vector3f(width / 2, height / 2, 0);
	}
	
	public Vector3f collisionAdjust(RHitbox hitbox) {
		Vector3f ret = new Vector3f();
		Vector3f distance = hitbox.center.sub(center, new Vector3f());
		distance.x = (float)Math.abs(distance.x);
		distance.y = (float)Math.abs(distance.y);

		distance.sub(halfExtent.add(hitbox.getHalfExtent(), new Vector3f()));
		if (distance.x < 0 && distance.y < 0) {
			Vector3f correction = hitbox.getCenter().sub(center, new Vector3f());
			if(distance.x > distance.y) {
				if(correction.x > 0)
					ret.x = distance.x;
				else
					ret.x = -distance.x;
			}
			else if(distance.x < distance.y) {
				if(correction.y > 0)
					ret.y = distance.y;
				else
					ret.y = -distance.y;   
			}
			else {
				if(correction.x > 0)
					ret.x = distance.x;
				else
					ret.x = -distance.x;
				if(correction.y > 0)
					ret.y = distance.y;
				else
					ret.y = -distance.y;
				
			}
		}
		return ret;
	}
	
	public boolean checkCollision(RHitbox hitbox) {
		Vector3f distance = hitbox.center.sub(center, new Vector3f());
		distance.x = (float)Math.abs(distance.x);
		distance.y = (float)Math.abs(distance.y);

		distance.sub(halfExtent.add(hitbox.getHalfExtent(), new Vector3f()));
		return (distance.x < 0 && distance.y < 0);
	}
	
	public void setPosition(float x, float y) {
		center.x = x + halfExtent.x;
		center.y = y + halfExtent.y;
	}
	
	public void translate(Vector3f translate) {
		center.x += translate.x;
		center.y += translate.y;
	}
	
	public void setBounds(float width, float height) {
		halfExtent.x = width / 2;
		halfExtent.y = height / 2;
		center.x += (width - halfExtent.x) / 2;
		center.y += (height - halfExtent.y) / 2;
	}
	
	public float getX() {
		return center.x - halfExtent.x;
	}

	public float getY() {
		return center.y - halfExtent.y;
	}
	
	public float getWidth() {
		return halfExtent.x * 2;
	}

	public float getHeight() {
		return halfExtent.y * 2;
	}
	
	public Vector3f getCenter() {
		return center;
	}
	
	public Vector3f getHalfExtent() {
		return halfExtent;
	}
}