package net.sourceforge.fenixedu.util;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.FieldPosition;
import java.text.NumberFormat;

/**
 * @author Nuno Nunes (nmsn@rnl.ist.utl.pt)
 * @author Joana Mota (jccm@rnl.ist.utl.pt)
 */
public class NumberUtils extends FenixUtil {

    /**
     * 
     * @param numberToFormat
     * @param decimalPlacement
     * @return the number with the desired decimal placements
     */
    public static Double formatNumber(Double numberToFormat, int decimalPlacement) {

	if (decimalPlacement == 0) {
	    return Double.valueOf(Math.round(numberToFormat.floatValue()));
	}

	NumberFormat numberFormat = NumberFormat.getInstance();
	StringBuffer stringBuffer = new StringBuffer();
	FieldPosition fieldPosition = new FieldPosition(0);

	numberFormat.setGroupingUsed(false);
	numberFormat.setMaximumFractionDigits(decimalPlacement);

	numberFormat.format(numberToFormat, stringBuffer, fieldPosition);

	int commaPosition = stringBuffer.indexOf(",");

	if (commaPosition != -1) {
	    stringBuffer = stringBuffer.replace(commaPosition, commaPosition + 1, ".");
	}

	numberToFormat = Double.valueOf(stringBuffer.toString());
	return numberToFormat;
    }

    public static Double formatDoubleWithoutRound(Double number, int numberOfDecimalPlaces) {
	DecimalFormat decimalFormat = new DecimalFormat("0.00000");
	DecimalFormatSymbols decimalFormatSymbols = new DecimalFormatSymbols();
	decimalFormatSymbols.setDecimalSeparator('.');
	decimalFormat.setDecimalFormatSymbols(decimalFormatSymbols);
	int position = decimalFormat.format(number).lastIndexOf(".");
	return Double.valueOf(decimalFormat.format(number).substring(0, position + numberOfDecimalPlaces + 1));
    }
}