// Direction.java
//
//
// Copyright 2004, Ethan Bolker and Bogdan Calota

package edu.umb.cs.eb.folding;

/**
 * Model a direction on a grid.
 */

public class Direction
{
    // for the hexagonal grid
    public static final Direction E  =  new Direction(" E", 1);
    public static final Direction SE =  new Direction("SE", 2);
    public static final Direction SW =  new Direction("SW", 3);
    public static final Direction  W =  new Direction(" W", -1);
    public static final Direction NW =  new Direction("NW", -2);
    public static final Direction NE =  new Direction("NE", -3);
    public static final Direction none =  new Direction("none", 0);

    // two extra directions for the square grid
    public static final Direction  N =  new Direction(" N", 8);
    public static final Direction  S =  new Direction(" S", -8);

    // two more for the cubic grid - up and down
    public static final Direction  U =  new Direction(" U", 10);
    public static final Direction  D =  new Direction(" D", -10);

    // for the rhombic dodecahedral grid ...
    public static final Direction NU =  new Direction("NU", -22);
    public static final Direction ND =  new Direction("ND", -24);
    public static final Direction SU =  new Direction("SU", -26);
    public static final Direction SD =  new Direction("SD", -28);

    public static final Direction EU =  new Direction("EU", -30);
    public static final Direction ED =  new Direction("ED", -32);
    public static final Direction WU =  new Direction("WU", -34);
    public static final Direction WD =  new Direction("WD", -36);

    private int index;
    private String name;

    private Direction( String name, int index )
    {
	this.name = name;
	this.index = index;
    }

    public String toString( )
    {
	return name;
    }
    
    public static Direction getDirection( String s ) 
    {
	s = s.trim();
	if (s.equals("E")) return E;
	if (s.equals("NE")) return NE;
	if (s.equals("NW")) return NW;
	if (s.equals("W")) return W;
	if (s.equals("SW")) return SW;
	if (s.equals("SE")) return SE;
	if (s.equals("N")) return N;
	if (s.equals("S")) return S;
	if (s.equals("U")) return U;
	if (s.equals("D")) return D;
	return Direction.none;
    }
    
    public static void main( String[] args ) 
    {
	System.out.println( Direction.getDirection(args[0]));
    }
}