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(double xOffset, double yOffset) {
		if (this.accumulatedScrollX != 0.0 && Math.signum(xOffset) != Math.signum(this.accumulatedScrollX)) {
			this.accumulatedScrollX = 0.0;
		}

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

		this.accumulatedScrollX += xOffset;
		this.accumulatedScrollY += yOffset;
		int i = (int)this.accumulatedScrollX;
		int j = (int)this.accumulatedScrollY;
		if (i == 0 && j == 0) {
			return new Vector2i(0, 0);
		} else {
			this.accumulatedScrollX -= i;
			this.accumulatedScrollY -= j;
			return new Vector2i(i, j);
		}
	}

	public static int getNextScrollWheelSelection(double yOffset, int selected, int selectionSize) {
		int i = (int)Math.signum(yOffset);
		selected -= i;
		selected = Math.max(-1, selected);

		while (selected < 0) {
			selected += selectionSize;
		}

		while (selected >= selectionSize) {
			selected -= selectionSize;
		}

		return selected;
	}
}