/**
 * Class that simulates a simple slot machine.
 * 
 * @author Dave Reed 
 * @version 9/21/06
 */
public class SlotMachine
{
    private int numSpins;       // keeps track of the number of spins
    
    /**
     * Constructor for objects of class SlotMachine.
     */
    public SlotMachine()
    {
        this.numSpins = 0;
    }

    /**
     * Simulates a spin of the slot machine.
     * @return a String identifying the three slot images obtained, and whether
     *         they represent a win or loss for the player
     */
    public String spin() {
        String slot1 = this.randomImage();
        String slot2 = this.randomImage();
        String slot3 = this.randomImage();
        this.numSpins = this.numSpins + 1;
        
        if (slot1.equals(slot2) && slot2.equals(slot3)) {
            return slot1 + "-" + slot2 + "-" + slot3 + ": YOU WIN!";
        }
        else {
            return slot1 + "-" + slot2 + "-" + slot3 + ": YOU LOSE!";
        }
    }
    
    /**
     * Private helper method for randomly generating a single slot image.
     * This method is called by the public spin method for getting the 
     * three slot images.
     *   @return the random image (either "cherry", "lemon", or "bar")
     */
    private String randomImage() {
        int randomNum = (int)(3*Math.random() + 1);   // either 1, 2 or 3
        if (randomNum == 1) {
            return "cherry";
        }
        else if (randomNum == 2) {
            return "lemon";
        }
        else {
            return "bar";
        }
    }
}