using System.Linq;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/*
*需要解决的问题：渲染的点过多时App会卡死
*解决方案：因为点集合的最终形态是球体，所以可按角度划分区间来控制点的密度
*/
public class PointCorrector {
    Ellipse ellipse;
    o0MagneticCalibraterEllipsoidFitting MagCalibrater;
    public static PointCorrector ins;

    public PointCorrector(
        Ellipse ellipse, 
        o0MagneticCalibraterEllipsoidFitting MagCalibrater
        ) {
        this.ellipse = ellipse;
        this.MagCalibrater = MagCalibrater;
    }

    const int correctNeedPointCount = 3600; //需要收集多少点才开始进行剔除
    int angleDivisionValue = 1; //多少角度分割为1个区间
    const int angleDivisionValueMax = 6; //最大多少角度分割为1个区间
    const float angleDivisionValueUpThreshold = 0.9f; //一轮点的剔除后，剩余的点超过百分之几时就加大角度分隔值

    public void Update(Vector3 centerPoint) {
        List<Vector3> li = this.ellipse.arrayList;
        if (li.Count > correctNeedPointCount) {
            HashSet<string> angleSet = new HashSet<string>();    
            li.RemoveAll(p => {
                Vector3 angle = Quaternion.LookRotation(p - centerPoint, Vector3.up).eulerAngles;
                string key = Mathf.FloorToInt(angle.x / angleDivisionValue) + "_" + Mathf.FloorToInt(angle.y / angleDivisionValue);
                if (angleSet.Contains(key)) {
                    return true;
                } else {
                    angleSet.Add(key);
                    return false;
                }
            });
            Debug.LogWarning("剔除完成：剩余点数：" + li.Count);
            if (li.Count > correctNeedPointCount * angleDivisionValueUpThreshold) {
                angleDivisionValue = System.Math.Min(angleDivisionValue + 1, angleDivisionValueMax);
                Debug.LogWarning("切割值尝试提升，当前值为" + angleDivisionValue);
            }
            MagCalibrater.records = li.ToList<Vector3>();
        }
    }
}