package com.quadrangle;

/**
 * A class for representing a rectangle. 
 * 
 * @author Quadrangle and Co.
 */
public class Rectangle
{
	private int width;
	private int height;

	/**
	 * Initializes this rectangle with the given width and height. 
	 * 
	 * @param width the width of this rectangle.
	 * @pre. width >= 0
	 * @param height the height of this rectangle.
	 * @pre. height >= 0
	 */
	public Rectangle(int width, int height)
	{
		this.width = width;
		this.height = height;
	}

	/**
	 * Returns the width of this rectangle. 
	 * 
	 * @return the width the width of this rectangle. 
	 */
	public int getWidth()
	{
		return this.width;
	}

	/**
	 * Sets the width of this rectangle to the given width. 
	 * 
	 * @param width the width of this rectangle.
	 * @pre. width >= 0
	 */
	public void setWidth(int width)
	{
		this.width = width;
	}
	
	/**
	 * Returns the height of this rectangle. 
	 * 
	 * @return the height of this rectangle. 
	 */
	public int getHeight()
	{
		return this.height;
	}

	/**
	 * Sets the height of this rectangle to the given height. 
	 * 
	 * @param height the height of this rectangle.
	 * @pre. height >= 0
	 */
	public void setHeight(int height)
	{
		this.height = height;
	}
	
	/**
	 * Returns the area of this rectangle. 
	 * 
	 * @return the area of this rectangle. 
	 */
	public int getArea()
	{
		return this.width * this.height;
	}

	/**
	 * Returns a string representation of this rectangle. 
	 * For example, the string representation of 
	 * new Rectangle(1, 2) is 
	 * "Rectangle of width 1 and height 2". 
	 * 
	 * @return a string representation of this rectangle.
	 */
	public String toString()
	{
		return String.format("Rectangle of width %d and height %d",
				this.width, this.height);
	}

	/**
	 * Scales this rectangle with the given factor. 
	 * 
	 * @param factor the scaling factor.
	 * @pre. factor >= 0
	 */
	public void scale(int factor)
	{
		this.width = this.width * factor;
		this.height = this.height * factor;
	}

	/**
	 * Returns the hash code of this rectangle.
	 * 
	 * @return the hash code of this rectangle.
	 */
	public int hashCode()
	{
		return this.getWidth() * this.getHeight();
	}

	/**
	 * Tests if this rectangle is the same as the given object. 
	 * Two rectangles are considered the same if they have the 
	 * same width and height.
	 * 
	 *  @param object an object.
	 *  @return true if this rectangle is the same as the given 
	 *  object, false otherwise.
	 */
	public boolean equals(Object object)
	{
		boolean equal;
		if (object != null && this.getClass() == object.getClass())
		{
			Rectangle other = (Rectangle) object;
			equal = this.getWidth() == other.getWidth() && this.getHeight() == other.getHeight();
		}
		else
		{
			equal = false;
		}
		return equal;
	}
}