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 *    this work for additional information regarding copyright ownership.
 *    The ASF licenses this file to You under the Apache License, Version 2.0
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 *
 *        http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.poi.ss.formula.functions;

import org.apache.poi.ss.formula.eval.*;

Compute the interest portion of a payment.
Author:
Mike Argyriou micharg@gmail.com/**
  * Compute the interest portion of a payment.
  * 
  * @author Mike Argyriou micharg@gmail.com
  */
public class PPMT extends NumericFunction {

	@Override
	public double eval(ValueEval[] args, int srcCellRow, int srcCellCol) throws EvaluationException {

		if(args.length < 4)
        		throw new EvaluationException(ErrorEval.VALUE_INVALID);

		double result;

		ValueEval v1 = OperandResolver.getSingleValue(args[0], srcCellRow, srcCellCol);
                ValueEval v2 = OperandResolver.getSingleValue(args[1], srcCellRow, srcCellCol);
                ValueEval v3 = OperandResolver.getSingleValue(args[2], srcCellRow, srcCellCol);
                ValueEval v4 = OperandResolver.getSingleValue(args[3], srcCellRow, srcCellCol);

		double interestRate = OperandResolver.coerceValueToDouble(v1);
                int period = OperandResolver.coerceValueToInt(v2);
                int numberPayments = OperandResolver.coerceValueToInt(v3);
                double PV = OperandResolver.coerceValueToDouble(v4);

		result = Finance.ppmt(interestRate, period, numberPayments, PV) ;

		checkValue(result);
		
		return result;
	}

	

}