package de.samdev.colorrunner.game.world.entities;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.math.Vector2;

import de.samdev.colorrunner.game.world.CRGameWorld;

public abstract class MovingEntity extends CRGameEntity {
	protected Vector2 velocity = new Vector2();

	private boolean face_TOP_isTouching = false;
	private boolean face_LEFT_isTouching = false;
	private boolean face_BOTTOM_isTouching = false;
	private boolean face_RIGHT_isTouching = false;
	
	public MovingEntity(CRGameWorld _owner, float width, float height) {
		this(_owner, 0, 0, width, height);
	}
	
	public MovingEntity(CRGameWorld _owner, float x, float y, float width, float height) {
		super(_owner, x, y, width, height);
	}

	protected boolean moveByX(float bx) {
		if (bx == 0) return false;
		
		boolean collided = false;
		
		bounds.x += bx;
		
		for (CRGameEntity ent : world.entities) {
			if (ent == this) continue;
			
			if (ent.bounds.overlaps(bounds)) {
				if (bx < 0) { // LEFT
					float correction = (ent.bounds.x + ent.bounds.width) - bounds.x;
					
					bounds.x += correction;
					bx += correction;
					
					collided = true;
				} else { // RIGHT
					float correction = ent.bounds.x - (bounds.x + bounds.width);
					
					bounds.x += correction;
					bx += correction;
					
					collided = true;
				}
			}
		}
		
		return collided;
	}
	
	protected boolean moveByY(float by) {
		if (by == 0) return false;
		
		boolean collided = false;
		
		bounds.y += by;
		
		for (CRGameEntity ent : world.entities) {
			if (ent == this) continue;
			
			if (ent.bounds.overlaps(bounds)) {
				if (by < 0) { // DOWN
					float correction = (ent.bounds.y + ent.bounds.height) - bounds.y;
					
					bounds.y += correction;
					by += correction;
					
					collided = true;
				} else { // UP
					float correction = ent.bounds.y - (bounds.y + bounds.height);
					
					bounds.y += correction;
					by += correction;
					
					collided = true;
				}
			}
		}
		
		return collided;
	}
	
	private void updateTouchCollisions() {
		face_TOP_isTouching = false;
		face_LEFT_isTouching = false;
		face_BOTTOM_isTouching = false;
		face_RIGHT_isTouching = false;
		
		for (CRGameEntity ent : world.entities) {
			if (ent == this) continue;
			
			if (Math.abs((ent.bounds.y + ent.bounds.height) - bounds.y) < F_EPSILON && ent.bounds.x < (bounds.x + bounds.width) && (ent.bounds.x + ent.bounds.width) > bounds.x) {
				face_BOTTOM_isTouching = true;
			}
			
			if (Math.abs((bounds.y + bounds.height) - ent.bounds.y) < F_EPSILON && ent.bounds.x < (bounds.x + bounds.width) && (ent.bounds.x + ent.bounds.width) > bounds.x) {
				face_TOP_isTouching = true;
			}
		}
		
	}
	
	public Vector2 getVelocity() {
		return velocity;
	}
	
	@Override
	public void update(float delta) {
		if (velocity.x != 0) {
			if (moveByX(velocity.x * delta)) {
				velocity.x = 0;
			}
		}
		
		if (velocity.y != 0) {
			if (moveByY(velocity.y * delta)) {
				velocity.y = 0;
			}
		}
		
		updateTouchCollisions();
	}

	public boolean isTouching_TOP() {
		return face_TOP_isTouching;
	}

	public boolean isTouching_LEFT() {
		return face_LEFT_isTouching;
	}

	public boolean isTouching_BOTTOM() {
		return face_BOTTOM_isTouching;
	}

	public boolean isTouching_RIGHT() {
		return face_RIGHT_isTouching;
	}
}