package onetomany.bargainingchipsgame;

/**
 * Stack contains a number of {@link Chip} objects of the same color and price. 
 * A stack=(chip, quantity). 
 * Aggregation of a two stacks of the same colors, creates another stack with the total quantity but its chip in a new price equal to weighted average of the both unit prices.  
 * Aggregation of a stack with the empty stack is itself.  
 * 
 * @author Faria Nassiri-Mofakham
 *
 */
public class Stack 
{
	private Chip chip;
	private int quantity;

	public Stack(Chip c, int q)
	{
		chip = c;
		quantity = q;
	}

	/**
	 * @return the chip
	 */
	public Chip getChip() {
		return chip;
	}

	/**
	 * @return the quantity
	 */
	public int getQuantity() 
	{
		return quantity;
	}

	public double getPrice()
	{
		return chip.getPrice()*quantity;
	}

	public String getColor()
	{
		return chip.getColor();
	}
	
	public boolean hasSameColorAs(Stack s)
	{
		return getColor().equals(s.getColor());
	}
	
	public Stack aggregateWith(Stack s) 
	{
		if (s!=null && chip.hasSameColorAs(s)) {
			String color = getChip().getColor();
			double p = (getChip().getPrice()*quantity+s.getChip().getPrice()*s.getQuantity())/(quantity+s.getQuantity());
			return new Stack(new Chip(color, p), quantity + s.getQuantity());
		} else 
			throw new IllegalStateException("\n\n[Warning] StackClass::aggregateWith(Stack). Different colors! Aggregating "+s+" into "+this+" is not possible.");
	}	

	@Override
	public String toString() 
	{
		return getQuantity()+" x "+getChip();
	}
}