/* 
GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org

This file is part of GeoGebra.

This program is free software; you can redistribute it and/or modify it 
under the terms of the GNU General Public License as published by 
the Free Software Foundation.

 */

package org.geogebra.common.kernel.advanced;

import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.algos.AlgoElement;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoNumeric;
import org.geogebra.common.kernel.geos.GeoText;

public class AlgoOrdinal extends AlgoElement {

	protected GeoNumeric n; // input
	protected GeoText text; // output

	public AlgoOrdinal(Construction cons, String label, GeoNumeric list) {
		super(cons);
		this.n = list;

		text = new GeoText(cons);
		text.setIsTextCommand(true); // stop editing as text
		setInputOutput(); // for AlgoElement

		// compute angle
		compute();

		text.setLabel(label);
	}

	@Override
	public Commands getClassName() {
		return Commands.Ordinal;
	}

	// for AlgoElement
	@Override
	protected void setInputOutput() {
		input = new GeoElement[1];
		input[0] = n;

		super.setOutputLength(1);
		super.setOutput(0, text);
		setDependencies(); // done by AlgoElement
	}

	public GeoText getResult() {
		return text;
	}

	@Override
	public void compute() {

		if (!n.isDefined()) {
			text.setTextString("");
			text.setUndefined();
			return;
		}

		double num = n.getDouble();

		if (num < 0 || Double.isNaN(num) || Double.isInfinite(num)) {
			text.setTextString("");
			text.setUndefined();
			return;
		}

		text.setTextString(getLoc().getOrdinalNumber((int) num));

	}

}