package coffee.liz.ecs.math;

import static java.lang.Math.sqrt;

import lombok.Builder;
import lombok.Data;
import lombok.Getter;
import lombok.RequiredArgsConstructor;

import java.util.function.Function;

/** Integer impl of {@link Vec2}. */
@Getter
@RequiredArgsConstructor
@Builder
@Data
public final class Vec2i implements Vec2<Integer> {
	/** X coordinate. */
	private final Integer x;

	/** Y coordinate. */
	private final Integer y;

	@Override
	public Vec2<Integer> plus(final Vec2<Integer> other) {
		return new Vec2i(x + other.getX(), y + other.getY());
	}

	@Override
	public Vec2<Integer> minus(final Vec2<Integer> other) {
		return new Vec2i(x - other.getX(), y - other.getY());
	}

	@Override
	public Vec2<Integer> scale(final Integer scaleX, final Integer scaleY) {
		return new Vec2i(x * scaleX, y * scaleY);
	}

	@Override
	public Vec2<Float> floatValue() {
		return Vec2f.builder().x(this.x.floatValue()).y(this.y.floatValue()).build();
	}

	@Override
	public Vec2<Integer> transform(final Function<Integer, Integer> xTransform,
			final Function<Integer, Integer> yTransform) {
		return new Vec2i(xTransform.apply(getX()), yTransform.apply(getY()));
	}

	@Override
	public Vec2<Integer> intValue() {
		return this;
	}

	@Override
	public float length() {
		return (float) sqrt(x * x + y * y);
	}

	public static final Vec2<Integer> NORTH = new Vec2i(0, 1);
	public static final Vec2<Integer> SOUTH = new Vec2i(0, -1);
	public static final Vec2<Integer> EAST = new Vec2i(1, 0);
	public static final Vec2<Integer> WEST = new Vec2i(-1, 0);
	public static final Vec2<Integer> ZERO = new Vec2i(0, 0);
}