package mightypork.utils.math.coord;


/**
 * Implementation of coordinate methods
 * 
 * @author MightyPork
 * @param <V> Return type of methods
 */
abstract class VecMath<V extends Vec> extends AbstractVec {
	
	/**
	 * <p>
	 * Some operation was performed and this result was obtained.
	 * </p>
	 * <p>
	 * It's now up to implementing class what to do - mutable ones can alter
	 * it's data values, immutable can return a new Vec.
	 * </p>
	 * 
	 * @param x
	 * @param y
	 * @param z
	 * @return the result Vec
	 */
	public abstract V result(double x, double y, double z);
	
	
	/**
	 * Set X coordinate (if immutable, in a copy).
	 * 
	 * @param x x coordinate
	 * @return result
	 */
	public V setX(double x)
	{
		return result(x, y(), z());
	}
	
	
	/**
	 * Set Y coordinate (if immutable, in a copy).
	 * 
	 * @param y y coordinate
	 * @return result
	 */
	public V setY(double y)
	{
		return result(x(), y, z());
	}
	
	
	/**
	 * Set Z coordinate (if immutable, in a copy).
	 * 
	 * @param z z coordinate
	 * @return result
	 */
	public V setZ(double z)
	{
		return result(x(), y(), z);
	}
	
	
	/**
	 * Get absolute value (positive)
	 * 
	 * @return result
	 */
	public V abs()
	{
		return result(Math.abs(x()), Math.abs(y()), Math.abs(z()));
	}
	
	
	/**
	 * Add a vector.
	 * 
	 * @param vec offset
	 * @return result
	 */
	public V add(Vec vec)
	{
		return add(vec.x(), vec.y(), vec.z());
	}
	
	
	/**
	 * Add to each component.<br>
	 * Z is unchanged.
	 * 
	 * @param x x offset
	 * @param y y offset
	 * @return result
	 */
	public V add(double x, double y)
	{
		return add(x, y, 0);
	}
	
	
	/**
	 * Add to each component.
	 * 
	 * @param x x offset
	 * @param y y offset
	 * @param z z offset
	 * @return result
	 */
	public V add(double x, double y, double z)
	{
		return result(x() + x, y() + y, z() + z);
	}
	
	
	/**
	 * Get copy divided by two
	 * 
	 * @return result
	 */
	public V half()
	{
		return mul(0.5);
	}
	
	
	/**
	 * Multiply each component.
	 * 
	 * @param d multiplier
	 * @return result
	 */
	public V mul(double d)
	{
		return mul(d, d, d);
	}
	
	
	/**
	 * Multiply each component.
	 * 
	 * @param vec vector of multipliers
	 * @return result
	 */
	public V mul(Vec vec)
	{
		return mul(vec.x(), vec.y(), vec.z());
	}
	
	
	/**
	 * Multiply each component.<br>
	 * Z is unchanged.
	 * 
	 * @param x x multiplier
	 * @param y y multiplier
	 * @return result
	 */
	public V mul(double x, double y)
	{
		return mul(x, y, 1);
	}
	
	
	/**
	 * Multiply each component.
	 * 
	 * @param x x multiplier
	 * @param y y multiplier
	 * @param z z multiplier
	 * @return result
	 */
	public V mul(double x, double y, double z)
	{
		return result(x() * x, y() * y, z() * z);
	}
	
	
	/**
	 * Round coordinates.
	 * 
	 * @return result
	 */
	public V round()
	{
		return result(Math.round(x()), Math.round(y()), Math.round(z()));
	}
	
	
	/**
	 * Round coordinates down.
	 * 
	 * @return result
	 */
	public V floor()
	{
		return result(Math.floor(x()), Math.floor(y()), Math.floor(z()));
	}
	
	
	/**
	 * Round coordinates up.
	 * 
	 * @return result
	 */
	public V ceil()
	{
		return result(Math.ceil(x()), Math.ceil(y()), Math.ceil(z()));
	}
	
	
	/**
	 * Subtract vector.
	 * 
	 * @param vec offset
	 * @return result
	 */
	public V sub(Vec vec)
	{
		return sub(vec.x(), vec.y(), vec.z());
	}
	
	
	/**
	 * Subtract a 2D vector.<br>
	 * Z is unchanged.
	 * 
	 * @param x x offset
	 * @param y y offset
	 * @return result
	 */
	public V sub(double x, double y)
	{
		return sub(x, y, 0);
	}
	
	
	/**
	 * Subtract a 3D vector.
	 * 
	 * @param x x offset
	 * @param y y offset
	 * @param z z offset
	 * @return result
	 */
	public V sub(double x, double y, double z)
	{
		return result(x() - x, y() - y, z() - z);
	}
	
	
	/**
	 * Negate all coordinates (* -1)
	 * 
	 * @return result
	 */
	public V neg()
	{
		return result(-x(), -y(), -z());
	}
	
	
	/**
	 * Scale vector to given size.
	 * 
	 * @param size size we need
	 * @return result
	 */
	public V norm(double size)
	{
		if (isZero()) return result(x(), y(), z()); // can't norm zero vector
			
		final double k = size / size();
		
		return mul(k);
	}
	
	
	@Override
	public int hashCode()
	{
		final int prime = 31;
		int result = 1;
		result = prime * result + Double.valueOf(x()).hashCode();
		result = prime * result + Double.valueOf(y()).hashCode();
		result = prime * result + Double.valueOf(z()).hashCode();
		return result;
	}
	
	
	@Override
	public boolean equals(Object obj)
	{
		if (this == obj) return true;
		if (obj == null) return false;
		if (!(obj instanceof Vec)) return false;
		final Vec other = (Vec) obj;
		
		return x() == other.x() && y() == other.y() && z() == other.z();
	}
	
	
	@Override
	public String toString()
	{
		return String.format("(%.1f %.1f %.1f)", x(), y(), z());
	}
}