/*
 * (c) Copyright Christian P. Fries, Germany. All rights reserved. Contact: email@christianfries.com.
 *
 * Created on 14.06.2015
 */

package net.finmath.montecarlo.interestrate.products.indices;

import java.util.Calendar;
import java.util.Set;

import net.finmath.exception.CalculationException;
import net.finmath.montecarlo.interestrate.LIBORModelMonteCarloSimulationInterface;
import net.finmath.stochastic.RandomVariableInterface;

/**
 * @author Christian Fries
 */
public class DateIndex extends AbstractIndex {

	private static final long serialVersionUID = 7457336500162149869L;

	public enum DateIndexType {
		DAY,
		MONTH,
		YEAR,
		NUMBER_OF_DAYS_IN_MONTH
	}

	private DateIndexType dateIndexType;
	
	/**
	 * @param name
	 * @param currency
	 */
	public DateIndex(String name, String currency, DateIndexType dateIndexType) {
		super(name, currency);
		this.dateIndexType = dateIndexType;
	}

	/**
	 * @param name
	 */
	public DateIndex(String name, DateIndexType dateIndexType) {
		super(name);
		this.dateIndexType = dateIndexType;
	}

	@Override
	public RandomVariableInterface getValue(double fixingTime, LIBORModelMonteCarloSimulationInterface model) throws CalculationException {
		Calendar referenceDate = (Calendar)model.getModel().getForwardRateCurve().getReferenceDate().clone();
		referenceDate.add(Calendar.DAY_OF_YEAR, (int)Math.round(fixingTime*365));
		referenceDate.set(Calendar.HOUR, 0);
		referenceDate.set(Calendar.MINUTE, 0);
		referenceDate.set(Calendar.SECOND, 0);
		referenceDate.set(Calendar.MILLISECOND, 0);
		
		double value = 0;
		switch(dateIndexType) {
		case DAY:
			value = referenceDate.get(Calendar.DAY_OF_MONTH);
			break;
		case MONTH:
			value = referenceDate.get(Calendar.MONTH);
			break;
		case YEAR:
			value = referenceDate.get(Calendar.YEAR);
			break;
		case NUMBER_OF_DAYS_IN_MONTH:
			value = referenceDate.getActualMaximum(Calendar.DAY_OF_MONTH);
			break;
		}

		return model.getRandomVariableForConstant(value);
	}

	@Override
	public Set queryUnderlyings() {
		return null;
	}

}