package net.minecraft.util;

public class BinaryAnimator {
	private final int animationLength;
	private final BinaryAnimator.EasingFunction easingFunction;
	private int ticks;
	private int ticksOld;

	public BinaryAnimator(int animationLength, BinaryAnimator.EasingFunction easingFunction) {
		this.animationLength = animationLength;
		this.easingFunction = easingFunction;
	}

	public BinaryAnimator(int animationLength) {
		this(animationLength, f -> f);
	}

	public void tick(boolean condition) {
		this.ticksOld = this.ticks;
		if (condition) {
			if (this.ticks < this.animationLength) {
				this.ticks++;
			}
		} else if (this.ticks > 0) {
			this.ticks--;
		}
	}

	public float getFactor(float partialTick) {
		float f = Mth.lerp(partialTick, (float)this.ticksOld, (float)this.ticks) / this.animationLength;
		return this.easingFunction.apply(f);
	}

	public interface EasingFunction {
		float apply(float f);
	}
}