/**
    * Copyright 2004-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.hr.time.workschedule.service;
  
  import java.sql.Date;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.joda.time.DateTime;
  import org.joda.time.Interval;
  import org.kuali.hr.time.util.TKUtils;
  import org.kuali.hr.time.util.TkConstants;
  import org.kuali.hr.time.workschedule.WorkSchedule;
  import org.kuali.hr.time.workschedule.WorkScheduleEntry;
  import org.kuali.hr.time.workschedule.dao.WorkScheduleDao;
  
  public class WorkScheduleServiceImpl implements WorkScheduleService {
  
  	private WorkScheduleDao workScheduleDao = null;
  
      @Override
      public WorkSchedule getWorkSchedule(Long workSchedule, Date asOfDate) {
          return workScheduleDao.getWorkSchedule(workSchedule, asOfDate);
      }
  
      public List<WorkScheduleEntry> getWorkSchedEntries(WorkSchedule workSchedule, java.util.Date beginDateTime, java.util.Date endDateTime){
  		List<WorkScheduleEntry> lstWorkScheduleEntries = new ArrayList<WorkScheduleEntry>();
  		//increment to the appropriate range based on the beginDate and endDate
  		//cycle through and return an appropriate list of workschedule entries based on
  		//the beginDateTime, endDatetime based in
  		DateTime workScheduleEffectiveDate = new DateTime(workSchedule.getEffectiveDate());
  		DateTime endWorkScheduleEffectiveDate = workScheduleEffectiveDate.plusDays(TkConstants.LENGTH_OF_WORK_SCHEDULE);
  
  		Interval payPeriodInterval = new Interval(beginDateTime.getTime(), endDateTime.getTime());
  		//create interval for work schedule effdt + TkConstants.LENGTH_OF_WORK_SCHEDULE days
  		Interval workScheduleInterval = new Interval(workScheduleEffectiveDate,endWorkScheduleEffectiveDate);
  		//if before pay period interval then return an empty list back
  		if(payPeriodInterval.isBefore(workScheduleInterval)){
  			return lstWorkScheduleEntries;
  		}
  
  		//determine the starting index of work schedule entries for the pay period
  		int indexOfWorkSchedule = 0;
  		Interval workSchedGap = payPeriodInterval.gap(workScheduleInterval);
  		if(workSchedGap!= null){
  			int days = TKUtils.convertMillisToWholeDays(workSchedGap.getEndMillis()-workSchedGap.getStartMillis());
  			if(days < TkConstants.LENGTH_OF_WORK_SCHEDULE){
  				indexOfWorkSchedule = days;
  			}
  			//determine offset
  			indexOfWorkSchedule = days % TkConstants.LENGTH_OF_WORK_SCHEDULE;
  		} else{
  			Interval workSchedOverlap = payPeriodInterval.overlap(workScheduleInterval);
  			if(workSchedOverlap != null){
  				int days = TKUtils.convertMillisToWholeDays(workSchedOverlap.toDurationMillis());
  
  				indexOfWorkSchedule = TkConstants.LENGTH_OF_WORK_SCHEDULE - days;
  			}
  		}
  
  		int numberOfDaysInPayPeriod = TKUtils.convertMillisToWholeDays(payPeriodInterval.toDurationMillis());
  		for(int i = 0 ;i<numberOfDaysInPayPeriod;i++){
  			indexOfWorkSchedule += i;
  			if(indexOfWorkSchedule >= TkConstants.LENGTH_OF_WORK_SCHEDULE){
  				indexOfWorkSchedule = 0;
  			}
  			//this assumes sorted by index of day
  			lstWorkScheduleEntries.add(workSchedule.getWorkScheduleEntries().get(indexOfWorkSchedule));
  		}
  		return lstWorkScheduleEntries;
  	}
  
  
  	@Override
  	public void saveOrUpdate(WorkSchedule workSchedule) {
  		workScheduleDao.saveOrUpdate(workSchedule);
  	}
  
  	@Override
  	public void saveOrUpdate(List<WorkSchedule> workSchedules) {
  		workScheduleDao.saveOrUpdate(workSchedules);
  	}
  
  	public void setWorkScheduleDao(WorkScheduleDao workScheduleDao) {
  		this.workScheduleDao = workScheduleDao;
  	}
 
 }