/**
 * Simulates a gaming wheel.
 * @author Jeff Raab
 */
public class GamingWheel {

    /** Prizes on this wheel. */
    protected Prize[] prizes = null;
    
    /** 
     * Constructs a wheel with the given prize values. 
     * @param values prize values for the wheel
     */
    public GamingWheel(int[] values) {
        if (values == null) {
            throw new RuntimeException("Array is null");
        }
        
        if (values.length < 2) {
            throw new RuntimeException("Not enough values");
        }
        
        prizes = new Prize[values.length];

        for (int i = 0; i < prizes.length; i++) {
            prizes[i] = new Prize(values[i]);
        }
    }
    
    /**
     * Spins this the given number of clicks.
     * @param num number of clicks to spin this
     */
    public void spin(int num) {
        for (int i = 0; i < num; i++) {
            rotateRight();
        }
    }
    
    /** Rotates the prizes in the array one index to the right. */
    private void rotateRight() {
        Prize temp = prizes[prizes.length - 1];
        
        for (int i = prizes.length - 1; i > 0; i--) {
            prizes[i] = prizes[i - 1];
        }
        
        prizes[0] = temp;
    }
    
    /** Returns the currently selected prize. */
    public Prize currentPrize() {
        return prizes[0];
    }
    
    /** Returns the number of prizes on this. */
    public int prizeCount() {
        return prizes.length;
    }
}