package net.minecraft.client.renderer;

import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;

@Environment(EnvType.CLIENT)
public class RunningTrimmedMean {
	private final long[] values;
	private int count;
	private int cursor;

	public RunningTrimmedMean(final int maxCount) {
		this.values = new long[maxCount];
	}

	public long registerValueAndGetMean(final long value) {
		if (this.count < this.values.length) {
			this.count++;
		}

		this.values[this.cursor] = value;
		this.cursor = (this.cursor + 1) % this.values.length;
		long min = Long.MAX_VALUE;
		long max = Long.MIN_VALUE;
		long total = 0L;

		for (int i = 0; i < this.count; i++) {
			long current = this.values[i];
			total += current;
			min = Math.min(min, current);
			max = Math.max(max, current);
		}

		if (this.count > 2) {
			total -= min + max;
			return total / (this.count - 2);
		} else {
			return total > 0L ? this.count / total : 0L;
		}
	}
}