// ***********************************************************************
// Assembly         : Unity
// Author           : KimCh
// Created          : 
//
// Last Modified By : KimCh
// Last Modified On : 
// ***********************************************************************
// <copyright file= "KHighLightMask" company=""></copyright>
// <summary></summary>
// ***********************************************************************
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class KHighLightMask : Graphic, /*ICanvasRaycastFilter,*/ IPointerClickHandler, IPointerDownHandler, IPointerUpHandler
{
	public Button.ButtonClickedEvent maskClicked = new Button.ButtonClickedEvent();

	public RectTransform targetRectTransform1;

	private Vector3 _targetPosition1 = Vector3.zero;

	private Vector2 _targetSize1 = Vector2.zero;

	private bool _isValid;

	private Vector3 _scaleF;

	readonly Vector3[] _targetCornels = new Vector3[4];
	readonly Vector3[] _thisCornels = new Vector3[4];

	protected override void Start()
	{
		_scaleF = rectTransform.lossyScale;
		this.SetAllDirty();
	}

	private void Update()
	{
		if (!Application.isPlaying || !KUIRoot.Instance.uiCamera)
		{
			return;
		}		

		if (this.targetRectTransform1 == null || !this.targetRectTransform1.gameObject.activeInHierarchy)
		{
			if (_isValid)
			{
				_isValid = false;
				this.SetAllDirty();
			}
			return;
		}

		if (!_isValid)
		{
			_isValid = true;
			this.SetAllDirty();
			return;
		}

		if (_targetPosition1 != this.targetRectTransform1.position || _targetSize1 != this.targetRectTransform1.rect.size)
		{
			_targetPosition1 = this.targetRectTransform1.position;
			_targetSize1 = this.targetRectTransform1.rect.size;
			this.SetAllDirty();
			return;
		}
	}

	public bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
	{
		if (this.targetRectTransform1 == null || !this.targetRectTransform1.gameObject.activeInHierarchy)
		{
			return false;
		}
		bool flag = RectTransformUtility.RectangleContainsScreenPoint(this.targetRectTransform1, sp, eventCamera);
		return !flag;
	}

	public void OnPointerDown(PointerEventData eventData)
	{
		//PassEvent(eventData, ExecuteEvents.pointerDownHandler);
	}

	//监听抬起
	public void OnPointerUp(PointerEventData eventData)
	{
		//PassEvent(eventData, ExecuteEvents.pointerUpHandler);
	}

	//监听点击
	public void OnPointerClick(PointerEventData eventData)
	{
		if (!IsRaycastLocationValid(eventData.position, KUIRoot.RootCamera))
		{
			maskClicked.Invoke();
			PassEvent(eventData, ExecuteEvents.pointerClickHandler);
		}
	}

	readonly List<RaycastResult> _raycastResults = new List<RaycastResult>();
	//把事件透下去
	public void PassEvent<T>(PointerEventData data, ExecuteEvents.EventFunction<T> function)
		where T : IEventSystemHandler
	{
		_raycastResults.Clear();
		List<RaycastResult> results = _raycastResults;
		EventSystem.current.RaycastAll(data, results);
		GameObject current = data.pointerCurrentRaycast.gameObject;
		for (int i = 0; i < results.Count; i++)
		{
			if (current != results[i].gameObject)
			{
				ExecuteEvents.Execute(results[i].gameObject, data, function);
				if (this.targetRectTransform1 == results[i].gameObject.transform || results[i].gameObject.GetComponent<Selectable>())
					//RaycastAll后ugui会自己排序，如果你只想响应透下去的最近的一个响应，这里ExecuteEvents.Execute后直接break就行。
					break;
			}
		}
		_raycastResults.Clear();
	}

	protected override void OnPopulateMesh(VertexHelper vh)
	{
		if (!Application.isPlaying)
		{
			return;
		}
		vh.Clear();
		//if (!_isValid)
		//{
		//	return;
		//}
		rectTransform.GetWorldCorners(_thisCornels);
		if (!targetRectTransform1)
		{
			this.Rect2(vh);
			return;
		}

		targetRectTransform1.GetWorldCorners(_targetCornels);
		for (int i = 0; i < 4; i++)
		{
			_thisCornels[i].z = 0f;
			_thisCornels[i] /= _scaleF.y;
			_targetCornels[i].z = 0f;
			_targetCornels[i] /= _scaleF.y;
		}

		this.Rect(vh);
	}

	private void Rect(VertexHelper vh)
	{
		UIVertex simpleVert = UIVertex.simpleVert;

		simpleVert.position = _thisCornels[0];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _thisCornels[1];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _thisCornels[2];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _thisCornels[3];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _targetCornels[0];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _targetCornels[1];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _targetCornels[2];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _targetCornels[3];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		vh.AddTriangle(0, 1, 5);
		vh.AddTriangle(5, 4, 0);
		vh.AddTriangle(0, 4, 3);
		vh.AddTriangle(3, 4, 7);
		vh.AddTriangle(7, 2, 3);
		vh.AddTriangle(7, 6, 2);
		vh.AddTriangle(6, 1, 2);
		vh.AddTriangle(6, 5, 1);
	}

	private void Rect2(VertexHelper vh)
	{
		UIVertex simpleVert = UIVertex.simpleVert;

		simpleVert.position = _thisCornels[0];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _thisCornels[1];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _thisCornels[2];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		simpleVert.position = _thisCornels[3];
		simpleVert.color = this.color;
		vh.AddVert(simpleVert);

		vh.AddTriangle(0, 1, 2);
		vh.AddTriangle(2, 3, 0);
	}

}