using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Events;

namespace Rokid.UXR.Interaction {	
	
	/// <summary>
	/// 不考虑拖拽阈值的按钮
	/// </summary>
	public class RKButton : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler, IPointerEnterHandler
	{
	    /// <summary>
	    /// 点击事件
	    /// </summary>
	    [SerializeField]
	    public float clickTime = 1f;
	
	    /// <summary>
	    /// 长按时间
	    /// </summary>
	    [SerializeField]
	    public float longPressTime = 2f;
	    [SerializeField, Tooltip("pointerDown->pointerExit过程会触发ButtonClick")]
	    public bool exitTriggerClick = false;
	    private float elapedTime;
	    private bool pointerDown;
	    private bool pointerUp;
	    private bool pointerExit;
	    public UnityEvent<PointerEventData> onPointerClick = new UnityEvent<PointerEventData>();
	    public UnityEvent<PointerEventData> onPointerDown = new UnityEvent<PointerEventData>();
	    public UnityEvent<PointerEventData> onLongClick = new UnityEvent<PointerEventData>();
	    private PointerEventData eventData;
	    private Vector3 pointerDownPos;
	    private Vector3 pointerExitPos;
	    private float result;
	
	
	    public void OnPointerDown(PointerEventData eventData)
	    {
	        this.eventData = eventData;
	        pointerDownPos = new Vector3(eventData.pointerCurrentRaycast.worldPosition.x,
	        eventData.pointerCurrentRaycast.worldPosition.y, eventData.pointerCurrentRaycast.worldPosition.z);
	        RKLog.Info("====RKButton==== pointerDownPos:" + pointerDownPos);
	        pointerDown = true;
	        pointerUp = false;
	        onPointerDown?.Invoke(eventData);
	    }
	
	    public void OnPointerUp(PointerEventData eventData)
	    {
	        pointerUp = true;
	    }
	
	    public void OnPointerEnter(PointerEventData eventData)
	    {
	        pointerExit = false;
	    }
	
	    public void OnPointerExit(PointerEventData eventData)
	    {
	        pointerExitPos = new Vector3(eventData.pointerCurrentRaycast.worldPosition.x,
	        eventData.pointerCurrentRaycast.worldPosition.y, eventData.pointerCurrentRaycast.worldPosition.z);
	        RKLog.Debug("====RKButton==== pointerExitPos:" + pointerExitPos);
	        Vector3 exitForward = pointerExitPos - pointerDownPos;
	        result = Vector3.Dot(exitForward.normalized, transform.forward);
	        pointerExit = true;
	    }
	
	    private void OnDisable()
	    {
	        result = 0;
	        pointerDownPos = Vector3.zero;
	        pointerExitPos = Vector3.zero;
	        elapedTime = 0;
	    }
	
	    private void Update()
	    {
	        if (pointerDown)
	        {
	            elapedTime += Time.deltaTime;
	        }
	        if (pointerDown && pointerUp && pointerExit == false)
	        {
	            pointerDown = false;
	            pointerUp = false;
	            pointerExit = false;
	            if (elapedTime < clickTime)
	            {
	                onPointerClick?.Invoke(eventData);
	            }
	            if (clickTime > longPressTime)
	            {
	                onLongClick?.Invoke(eventData);
	            }
	            eventData = null;
	            elapedTime = 0;
	        }
	        if (pointerExit)
	        {
	            if (exitTriggerClick && pointerDown && elapedTime < clickTime && result != 0)
	            {
	                RKLog.Debug("====RKButton==== dot.result:" + result);
	                onPointerClick?.Invoke(eventData);
	            }
	            if (clickTime > longPressTime)
	            {
	                onLongClick?.Invoke(eventData);
	            }
	            pointerDown = false;
	            pointerUp = false;
	            eventData = null;
	            elapedTime = 0;
	        }
	    }
	}
}