using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

namespace Rokid.UXR.Interaction {	
	public class ButtonState : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerEnterHandler, IPointerExitHandler
	{
	    [SerializeField]
	    private Sprite pressed;
	    [SerializeField]
	    private Sprite highlight;
	    [SerializeField]
	    private Sprite normal;
	    [SerializeField]
	    private Image targetGraphic;
	    [SerializeField]
	    private Image hotArea;
	    [SerializeField]
	    private bool hovering;
	    [SerializeField]
	    private bool pointerDown;
	
	    /// <summary>
	    /// 默认 graphicScale
	    /// </summary>
	    private Vector3 oriGraphicScale;
	
	    private Vector3 oriHotAreaScale;
	
	    /// <summary>
	    /// hover状态 graphicScale
	    /// </summary>
	    public float hoverScale = 1.0f;
	
	    /// <summary>
	    /// hover状态 hotArea
	    /// </summary>
	    public float hotAreaHoverScale = 1.0f;
	
	    public float downScale = 1.0f;
	
	    public void OnPointerDown(PointerEventData eventData)
	    {
	        pointerDown = true;
	    }
	
	    public void OnPointerUp(PointerEventData eventData)
	    {
	        pointerDown = false;
	    }
	
	    public void OnPointerEnter(PointerEventData eventData)
	    {
	        hovering = true;
	    }
	
	    public void OnPointerExit(PointerEventData eventData)
	    {
	        hovering = false;
	        pointerDown = false;
	    }
	
	    private void Start()
	    {
	        oriGraphicScale = targetGraphic.transform.localScale;
	        if (hotArea != null)
	            oriHotAreaScale = hotArea.transform.localScale;
	    }
	
	    private void OnEnable()
	    {
	        OnPointerExit(null);
	    }
	
	    private void OnDisable()
	    {
	        OnPointerExit(null);
	    }
	
	    private void Update()
	    {
	        if (hovering && !pointerDown)
	        {
	            targetGraphic.sprite = highlight;
	            targetGraphic.transform.localScale = oriGraphicScale * hoverScale;
	            if (hotArea != null)
	                hotArea.transform.localScale = oriHotAreaScale * hotAreaHoverScale;
	        }
	        else if (pointerDown)
	        {
	            targetGraphic.sprite = pressed;
	            targetGraphic.transform.localScale = oriGraphicScale * downScale;
	            if (hotArea != null)
	                hotArea.transform.localScale = oriHotAreaScale * hotAreaHoverScale;
	        }
	        else
	        {
	            targetGraphic.sprite = normal;
	            targetGraphic.transform.localScale = oriGraphicScale;
	            if (hotArea != null)
	                hotArea.transform.localScale = oriHotAreaScale;
	        }
	    }
	}
}