package bjc.dicelang.dice;

import java.util.Arrays;

/*
 * @NOTE
 * 	I'm not a particularly large fan of sticking everything on this class
 * 	and just documenting which fields are tied together in a non-obvious
 * 	way. I think a class hierarchy might be better, but I am unsure of the
 * 	details.
 */
/**
 * Represents either a die or a die list.
 *
 * @author Ben Culkin
 */
public class DieExpression {
	/** Is this expression a list? */
	public final boolean isList;

	/** The scalar value in this expression, if there is one. */
	public Die      scalar;
	/** The list value in this expression, if there is one. */
	public DieList  list;

	/**
	 * Create a scalar die expression.
	 *
	 * @param scal
	 *                The scalar value of this expression.
	 */
	public DieExpression(final Die scal) {
		isList = false;
		scalar = scal;
	}

	/**
	 * Create a list die expression.
	 *
	 * @param lst
	 *                The list value of this expression.
	 */
	public DieExpression(final DieList lst) {
		isList = true;
		list = lst;
	}

	@Override
	public String toString() {
		if (isList) {
			return list.toString();
		}

		return scalar.toString();
	}

	/**
	 * Get the value of this expression as a string.
	 *
	 * @return The value of the expression as a string.
	 */
	public String value() {
		if (isList) {
			return Arrays.toString(list.roll());
		}

		return Long.toString(scalar.roll());
	}
}