/*
 * 
 jFin, open source derivatives trade processing 
 *
 * 
Copyright (C) 2005-2011 Morgan Brown Consultancy Ltd. 
 *
 * 
This file is part of jFin. 
 *
 * 
 jFin 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; either version 2 of the License, or (at your option) any later
 * version. 
 *
 * 
 jFin is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details. 
 *
 * 
 You should have received a copy of the GNU General Public License along
 * with jFin; if not, write to the Free Software Foundation, Inc., 51 Franklin
 * St, Fifth Floor, Boston, MA 02110-1301 USA. 
 */

package com.mbc.jfin.schedule.impl;

import com.mbc.jfin.schedule.Schedule;
import com.mbc.jfin.schedule.ScheduleException;
import com.mbc.jfin.schedule.SchedulePeriod;
import org.joda.time.LocalDate;
import org.joda.time.ReadablePeriod;

import java.util.ArrayList;

/**
 * Created by IntelliJ IDEA.
 * User: dmb
 * Date: 24/04/2011
 * Time: 15:34
 */
public class LongFirstStubScheduleGenerator extends AbstractBaseScheduleGenerator {


    public LongFirstStubScheduleGenerator() {
        super(-1);
    }

    public LongFirstStubScheduleGenerator(int maxPeriods) {
        super(maxPeriods);
    }

    public Schedule generate(LocalDate start, LocalDate end, ReadablePeriod frequency) throws ScheduleException {
        ArrayList schedulePeriods = new ArrayList();

        LocalDate holdDate = end;

        int periodCount = 1;

        while (holdDate.isAfter(start))
        {
            LocalDate nextDate = end.minus(multiplyPeriod(frequency,periodCount));

            LocalDate nextDate2 = end.minus(multiplyPeriod(frequency,periodCount+1));

            if (nextDate2.isBefore(start))
            {
                SchedulePeriod schedulePeriod = new SchedulePeriod(start, holdDate, nextDate, holdDate);

                schedulePeriods.add(0,schedulePeriod);

                holdDate = nextDate2;
            } else {
                SchedulePeriod schedulePeriod = new SchedulePeriod(nextDate, holdDate);

                schedulePeriods.add(0,schedulePeriod);

                holdDate = nextDate;
            }



            periodCount++;
            if(maxPeriods>0 && periodCount>maxPeriods) {
                throw new ScheduleTooLongException(maxPeriods);
            }
        }

        return new Schedule(schedulePeriods);
    }
}