/**
 * The keyboard class allows storage of and access to facts about
 * a particular keyboard.
 *
 */
public class Keyboard
{
    int noofKeys, currentKey;
    char zeroLetter;
    int zeroOctave; //Where did we start out?

    public static void main(String args[])
    {
	//Unit test:
	Keyboard k = new Keyboard('C', 4);
	// System.out.println(k.getDistanceTo('C', 2) );
	// System.out.println(k.getDistanceTo('A', 4) );
	// System.out.println(k.getDistanceTo('G', 3) );
    }

    public Keyboard(char topLetter, int topOctave)
    {
	noofKeys = 1; //Where we start out.
	currentKey = 0; // as it turns out, the keyboard starts at key 0 and
	// goes down from there...  This is a bizarre design decision, but
	// it works.

	this.zeroLetter = topLetter;
	this.zeroOctave = topOctave;
    }



    public int getNoofKeys()
    {
	return noofKeys;
    }

    public void moved(int noofSteps)
    {
	currentKey += noofSteps;
	//KEYS RUN FROM -(N-1) TO 0
	if (currentKey < (1 - noofKeys)) noofKeys = (1 - currentKey) ;
    }  				     
    

    public int getCurrentKey()
    {
	return currentKey;
    }


    public void setCurrentKey(int ck)
    {
	currentKey = ck;
    }

    public int getKeyNum(char letter, int octave)
    {
	int smalldist = letter - zeroLetter;

	int bigdist = (octave - zeroOctave)*7;
    
	return bigdist + smalldist;
    }
    
    public int getDistanceTo(char letter, int octave) 
    {
	int keynum = getKeyNum(letter, octave);
	
	return (keynum - currentKey);
    }

    /**
     * 
     * Oops, we're back at the edge of the keyboard.
     *
     *
     */
    public void atEdge(boolean forward)
    {
	if (forward)
	    currentKey = 0;
	else
	    {
		currentKey = -1 * (noofKeys - 1);
	    }
    }
}