package net.minecraft.util;

public class SmoothDouble {
	private double targetValue;
	private double remainingValue;
	private double lastAmount;

	public double getNewDeltaValue(final double targetDelta, final double time) {
		this.targetValue += targetDelta;
		double delta = this.targetValue - this.remainingValue;
		double newLastAmount = Mth.lerp(0.5, this.lastAmount, delta);
		double deltaSign = Math.signum(delta);
		if (deltaSign * delta > deltaSign * this.lastAmount) {
			delta = newLastAmount;
		}

		this.lastAmount = newLastAmount;
		this.remainingValue += delta * time;
		return delta * time;
	}

	public void reset() {
		this.targetValue = 0.0;
		this.remainingValue = 0.0;
		this.lastAmount = 0.0;
	}
}