using System;

namespace AForge.Math;

[Serializable]
public class ContinuousHistogram
{
	private int[] values;

	private Range range;

	private float mean;

	private float stdDev;

	private float median;

	private float min;

	private float max;

	private int total;

	public int[] Values => values;

	public Range Range => range;

	public float Mean => mean;

	public float StdDev => stdDev;

	public float Median => median;

	public float Min => min;

	public float Max => max;

	public ContinuousHistogram(int[] values, Range range)
	{
		this.values = values;
		this.range = range;
		Update();
	}

	public Range GetRange(float percent)
	{
		int num = (int)((float)total * (percent + (1f - percent) / 2f));
		int num2 = values.Length;
		int num3 = num2 - 1;
		int i = 0;
		int num4 = total;
		for (; i < num2; i++)
		{
			num4 -= values[i];
			if (num4 < num)
			{
				break;
			}
		}
		int num5 = num3;
		num4 = total;
		while (num5 >= 0)
		{
			num4 -= values[num5];
			if (num4 < num)
			{
				break;
			}
			num5--;
		}
		return new Range((float)i / (float)num3 * range.Length + range.Min, (float)num5 / (float)num3 * range.Length + range.Min);
	}

	public void Update()
	{
		int num = values.Length;
		int num2 = num - 1;
		float length = range.Length;
		float num3 = range.Min;
		max = 0f;
		min = num;
		mean = 0f;
		stdDev = 0f;
		total = 0;
		double num4 = 0.0;
		int num5;
		for (int i = 0; i < num; i++)
		{
			num5 = values[i];
			if (num5 != 0)
			{
				if ((float)i > max)
				{
					max = i;
				}
				if ((float)i < min)
				{
					min = i;
				}
			}
			total += num5;
			num4 += ((double)i / (double)num2 * (double)length + (double)num3) * (double)num5;
		}
		if (total != 0)
		{
			mean = (float)(num4 / (double)total);
		}
		min = min / (float)num2 * length + num3;
		max = max / (float)num2 * length + num3;
		num4 = 0.0;
		for (int i = 0; i < num; i++)
		{
			num5 = values[i];
			double num6 = (double)i / (double)num2 * (double)length + (double)num3 - (double)mean;
			num4 += num6 * num6 * (double)num5;
		}
		if (total != 0)
		{
			stdDev = (float)System.Math.Sqrt(num4 / (double)total);
		}
		int num7 = total / 2;
		int j = 0;
		num5 = 0;
		for (; j < num; j++)
		{
			num5 += values[j];
			if (num5 >= num7)
			{
				break;
			}
		}
		median = (float)j / (float)num2 * length + num3;
	}
}