package net.minecraft.client;

import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import org.joml.Vector2i;

@Environment(EnvType.CLIENT)
public class ScrollWheelHandler {
	private double accumulatedScrollX;
	private double accumulatedScrollY;

	public Vector2i onMouseScroll(final double scaledXScrollOffset, final double scaledYScrollOffset) {
		if (this.accumulatedScrollX != 0.0 && Math.signum(scaledXScrollOffset) != Math.signum(this.accumulatedScrollX)) {
			this.accumulatedScrollX = 0.0;
		}

		if (this.accumulatedScrollY != 0.0 && Math.signum(scaledYScrollOffset) != Math.signum(this.accumulatedScrollY)) {
			this.accumulatedScrollY = 0.0;
		}

		this.accumulatedScrollX += scaledXScrollOffset;
		this.accumulatedScrollY += scaledYScrollOffset;
		int wheelX = (int)this.accumulatedScrollX;
		int wheelY = (int)this.accumulatedScrollY;
		if (wheelX == 0 && wheelY == 0) {
			return new Vector2i(0, 0);
		} else {
			this.accumulatedScrollX -= wheelX;
			this.accumulatedScrollY -= wheelY;
			return new Vector2i(wheelX, wheelY);
		}
	}

	public static int getNextScrollWheelSelection(final double wheel, int currentSelected, final int limit) {
		int step = (int)Math.signum(wheel);
		currentSelected -= step;
		currentSelected = Math.max(-1, currentSelected);

		while (currentSelected < 0) {
			currentSelected += limit;
		}

		while (currentSelected >= limit) {
			currentSelected -= limit;
		}

		return currentSelected;
	}
}