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package jscl.math.operator.number;

import jscl.math.Generic;
import jscl.math.JsclInteger;
import jscl.math.NotIntegerException;
import jscl.math.Variable;
import jscl.math.operator.Operator;
import jscl.mathml.MathML;

import javax.annotation.Nonnull;

public class EulerPhi extends Operator {

	public static final String NAME = "eulerphi";

	public EulerPhi(Generic integer) {
		super(NAME, new Generic[]{integer});
	}

	private EulerPhi(Generic parameters[]) {
		super(NAME, parameters);
	}

	@Override
	public int getMinParameters() {
		return 1;
	}

	public Generic selfExpand() {
		try {
			JsclInteger en = parameters[0].integerValue();
			return en.phi();
		} catch (NotIntegerException e) {
		}
		return expressionValue();
	}

	protected void nameToMathML(MathML element) {
		MathML e1 = element.element("mi");
		e1.appendChild(element.text("\u03C6"));
		element.appendChild(e1);
	}

	@Nonnull
	public Variable newInstance() {
		return new EulerPhi((Generic) null);
	}

	@Nonnull
	@Override
	public Operator newInstance(@Nonnull Generic[] parameters) {
		return new EulerPhi(parameters);
	}
}