using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

//多准心渲染姿态角-测试用
public class MultipleCrossHair : MonoBehaviour
{
    public static MultipleCrossHair ins;
    List<RectTransform> crossHairList = new List<RectTransform>();

    void Start()
    {
        ins = this;
        BowCamera.ins.onAfterLateUpdate += MyUpdate;

        crossHairList.Add(CreateNewCrossHair(Color.green));
        crossHairList.Add(CreateNewCrossHair(Color.yellow));
    }

    readonly Vector3 centerPoint = new Vector3(0.5f, 0.5f, 0);

    void MyUpdate()
    {

    }

    public void UpdateCrossHairByRotation2(int crossHairIndex, Quaternion rotation)
    {
        RectTransform rectTF = crossHairList[crossHairIndex];
        UpdateCrossHairByRotation(rectTF, rotation);
    }

    void UpdateCrossHairByRotation(RectTransform rectTF, Quaternion rotation)
    {
        //把z轴旋转弄成0
        rotation = Quaternion.LookRotation(rotation * Vector3.forward);

        //比率转化，边界限制
        Vector3 theAngles = rotation.eulerAngles;
        float bowRotateConvertRate = UserSettings.ins.bowRotateConvert.GetRate();
        theAngles.x = Mathf.Clamp((theAngles.x > 180 ? theAngles.x - 360 : theAngles.x) * bowRotateConvertRate,
            -80, 80);
        theAngles.y = Mathf.Clamp((theAngles.y > 180 ? theAngles.y - 360 : theAngles.y) * bowRotateConvertRate,
            -80, 80);

        //rotation参数看作本地四元组，还得根据游戏场景转成世界四元组
        Transform TF = BowCamera.ins.transform;
        Vector3 forward = GameMgr.ins.transform.rotation * (Quaternion.Euler(theAngles) * Vector3.forward);

        Ray ray = new Ray(TF.position, forward);
        RaycastHit hitInfo;
        Vector3 targetPosition;
        if (Physics.Raycast(ray, out hitInfo, 100))
        {
            targetPosition = hitInfo.point;
        }
        else
        {
            targetPosition = TF.position + forward * 100f;
        }
        RectTransform parentRTF = CrossHair.ins.transform.parent.GetComponent<RectTransform>();
        Vector3 v3 = Camera.main.WorldToViewportPoint(targetPosition) - centerPoint;
        v3.x *= parentRTF.rect.width;
        v3.y *= parentRTF.rect.height;
        v3.z = 0;
        rectTF.localPosition = v3;
    }

    //创建一个新的准心
    RectTransform CreateNewCrossHair(Color color)
    {
        Transform parentTF = CrossHair.ins.transform.parent;
        RectTransform RTF = new GameObject().AddComponent<RectTransform>();
        RTF.SetParent(parentTF);
        RTF.localRotation = Quaternion.identity;
        RTF.localPosition = Vector3.zero;
        RTF.localScale = new Vector3(1, 1, 1);
        RTF.gameObject.AddComponent<CanvasRenderer>().cullTransparentMesh = false;
        Image imgComp = RTF.gameObject.AddComponent<Image>();
        imgComp.sprite = CrossHair.ins.GetComponent<Image>().sprite;
        imgComp.SetNativeSize();
        Material mat = new Material(Shader.Find("Custom/Outlight"));
        mat.SetColor("_LightColor", color);
        mat.SetInt("_Size", 30);
        imgComp.material = mat;
        return RTF;
    }
}