using UnityEngine;
using System.Collections;

public class SlidingHidder : MonoBehaviour {

	public bool visible = true;
	public bool slideOnX = true;
	public bool toLeft = true;
	public bool slideOnY = false;
	public bool toTop = false;
	public float speed = 1f;
	public bool disableWhenHidden = true;

	private Transform transform;
	private Vector2 hiddenPosition;
	private Vector2 visiblePosition;

	public void setVisible(bool visible)
	{
		this.gameObject.SetActive(true);
		this.visible = visible;
	}

	void Start ()
	{
		transform = this.gameObject.transform;
		Rect obj = this.gameObject.GetComponent<RectTransform>().rect;

		visiblePosition = transform.position;
		hiddenPosition = visiblePosition;

		if (slideOnX) hiddenPosition.x += toLeft ? -obj.width : obj.width;
		if (slideOnY) hiddenPosition.y += toTop ? -obj.height: obj.height;

		transform.position = visible ? visiblePosition : hiddenPosition;
		this.gameObject.SetActive(visible);
	}
	
	void Update ()
	{
		Vector2 position = transform.position;
		Vector2 objective = visible ? visiblePosition : hiddenPosition;

		if (slideOnX && Mathf.Abs(position.x - objective.x) > speed)
			position.x += position.x < objective.x ? speed : -speed;
		else
			position.x = objective.x;

		if (slideOnY && Mathf.Abs(position.y - objective.y) > speed)
			position.y = position.y + (position.y < objective.y ? speed : -speed);
		else
			position.y = objective.y;
		
		transform.position = position;
        this.gameObject.SetActive(!disableWhenHidden
				|| (position.x != hiddenPosition.x || position.y != hiddenPosition.y)
			);
	}

}