// ***********************************************************************
// Assembly         : Game
// Author           : Kimch
// Created          : 2021-05-02
// Description      :
// Last Modified By : 
// Last Modified On : 
// ***********************************************************************
// <copyright file= "KGuideMask" company="Kunpo"></copyright>
// <summary></summary>
// ***********************************************************************
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// 
/// </summary>
public class KGuideMask : MaskableGraphic, ICanvasRaycastFilter
{
	private RectTransform _target;
	private RectTransform _targetArea;
	private Vector2 _targetMin;
	private Vector2 _targetMax;

	public bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
	{
		return !RectTransformUtility.RectangleContainsScreenPoint(_targetArea, screenPoint, eventCamera);
	}

	public void Init()
	{
		_targetArea = gameObject.transform.Find("TargetArea") as RectTransform;
		gameObject.SetActive(false);
	}

	public void Play(RectTransform target)
	{
		gameObject.SetActive(true);

		var screenPoint = RectTransformUtility.WorldToScreenPoint(KUIRoot.RootCamera, target.position);

		Vector2 localPoint;
		if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPoint, KUIRoot.RootCamera, out localPoint))
		{
			gameObject.SetActive(false);
			return;
		}

		_targetArea.anchorMax = target.anchorMax;
		_targetArea.anchorMin = target.anchorMin;
		_targetArea.anchoredPosition = target.anchoredPosition;
		_targetArea.anchoredPosition3D = target.anchoredPosition3D;
		_targetArea.offsetMax = target.offsetMax;
		_targetArea.offsetMin = target.offsetMin;
		_targetArea.pivot = target.pivot;
		_targetArea.sizeDelta = target.sizeDelta;
		_targetArea.localPosition = localPoint;

		_targetArea.ForceUpdateRectTransforms();
		_target = _targetArea;
		_target.ForceUpdateRectTransforms();
		LateUpdate();
	}

	private void RefreshView()
	{
		Vector2 newMin;
		Vector2 newMax;
		if (_target && _target.gameObject.activeSelf)
		{
			var bounds = RectTransformUtility.CalculateRelativeRectTransformBounds(transform, _target);
			newMin = bounds.min;
			newMax = bounds.max;
		}
		else
		{
			newMin = Vector2.zero;
			newMax = Vector2.zero;
		}

		if (_targetMin != newMin || _targetMax != newMax)
		{
			_targetMin = newMin;
			_targetMax = newMax;
			SetAllDirty();
		}
	}

	protected override void OnPopulateMesh(VertexHelper toFill)
	{
		toFill.Clear();

		var maskRect = rectTransform.rect;

		var maskRectLeftTop = new Vector2(-maskRect.width / 2, maskRect.height / 2);
		var maskRectLeftBottom = new Vector2(-maskRect.width / 2, -maskRect.height / 2);
		var maskRectRightTop = new Vector2(maskRect.width / 2, maskRect.height / 2);
		var maskRectRightBottom = new Vector2(maskRect.width / 2, -maskRect.height / 2);

		var targetRectLeftTop = new Vector2(_targetMin.x, _targetMax.y);
		var targetRectLeftBottom = _targetMin;
		var targetRectRightTop = _targetMax;
		var targetRectRightBottom = new Vector2(_targetMax.x, _targetMin.y);

		var vertex = UIVertex.simpleVert;
		toFill.AddVert(maskRectLeftBottom, color, Vector2.zero);
		toFill.AddVert(targetRectLeftBottom, color, Vector2.zero);
		toFill.AddVert(targetRectRightBottom, color, Vector2.zero);
		toFill.AddVert(maskRectRightBottom, color, Vector2.zero);
		toFill.AddVert(targetRectRightTop, color, Vector2.zero);
		toFill.AddVert(maskRectRightTop, color, Vector2.zero);
		toFill.AddVert(targetRectLeftTop, color, Vector2.zero);
		toFill.AddVert(maskRectLeftTop, color, Vector2.zero);

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

	void LateUpdate()
	{
		RefreshView();
	}
}