package net.minecraft.util;

import net.minecraft.core.Direction;

public class SegmentedAnglePrecision {
	private final int mask;
	private final int precision;
	private final float degreeToAngle;
	private final float angleToDegree;

	public SegmentedAnglePrecision(int precision) {
		if (precision < 2) {
			throw new IllegalArgumentException("Precision cannot be less than 2 bits");
		} else if (precision > 30) {
			throw new IllegalArgumentException("Precision cannot be greater than 30 bits");
		} else {
			int i = 1 << precision;
			this.mask = i - 1;
			this.precision = precision;
			this.degreeToAngle = i / 360.0F;
			this.angleToDegree = 360.0F / i;
		}
	}

	public boolean isSameAxis(int first, int second) {
		int i = this.getMask() >> 1;
		return (first & i) == (second & i);
	}

	public int fromDirection(Direction direction) {
		if (direction.getAxis().isVertical()) {
			return 0;
		} else {
			int i = direction.get2DDataValue();
			return i << this.precision - 2;
		}
	}

	public int fromDegreesWithTurns(float degreesWithTurns) {
		return Math.round(degreesWithTurns * this.degreeToAngle);
	}

	public int fromDegrees(float degrees) {
		return this.normalize(this.fromDegreesWithTurns(degrees));
	}

	public float toDegreesWithTurns(int degrees) {
		return degrees * this.angleToDegree;
	}

	public float toDegrees(int degreesWithTurns) {
		float f = this.toDegreesWithTurns(this.normalize(degreesWithTurns));
		return f >= 180.0F ? f - 360.0F : f;
	}

	public int normalize(int degrees) {
		return degrees & this.mask;
	}

	public int getMask() {
		return this.mask;
	}
}