/**
    * Copyright 2004-2012 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.dept.lunch.service;
  
  import org.apache.log4j.Logger;
  import org.kuali.hr.time.dept.lunch.DeptLunchRule;
  import org.kuali.hr.time.dept.lunch.dao.DepartmentLunchRuleDao;
  import org.kuali.hr.time.service.base.TkServiceLocator;
  import org.kuali.hr.time.timeblock.TimeBlock;
  import org.kuali.hr.time.timeblock.TimeHourDetail;
  import org.kuali.hr.time.util.TKUtils;
  import org.kuali.hr.time.util.TkConstants;
  import org.kuali.hr.time.workflow.TimesheetDocumentHeader;
  
  import java.math.BigDecimal;
  import java.sql.Date;
  import java.util.List;
  
  public class DepartmentLunchRuleServiceImpl implements DepartmentLunchRuleService {
  	public DepartmentLunchRuleDao deptLunchRuleDao;
  	private static final Logger LOG = Logger.getLogger(DepartmentLunchRuleServiceImpl.class);
  
  	@Override
  	public DeptLunchRule getDepartmentLunchRule(String dept, Long workArea,
  			String principalId, Long jobNumber, Date asOfDate) {
  		DeptLunchRule deptLunchRule = deptLunchRuleDao.getDepartmentLunchRule(dept, workArea, principalId, jobNumber, asOfDate);
  		if(deptLunchRule!=null){
  			return deptLunchRule;
  		}
  		deptLunchRule = deptLunchRuleDao.getDepartmentLunchRule(dept, workArea, principalId, -1L, asOfDate);
  		if(deptLunchRule!=null){
  			return deptLunchRule;
  		}
  		deptLunchRule = deptLunchRuleDao.getDepartmentLunchRule(dept, workArea, "%", -1L, asOfDate);
  
  		if(deptLunchRule!=null){
  			return deptLunchRule;
  		}
  		deptLunchRule = deptLunchRuleDao.getDepartmentLunchRule(dept, -1L, "%", -1L, asOfDate);
  
  		if(deptLunchRule!=null){
  			return deptLunchRule;
  		}
  		deptLunchRule = deptLunchRuleDao.getDepartmentLunchRule(dept, -1L, principalId, -1L, asOfDate);
  		return deptLunchRule;
  	}
  
  	/**
  	 * If the hours is greater or equal than the shift hours, deduct the hour from the deduction_mins field
  	 */
  	@Override
  	public void applyDepartmentLunchRule(List<TimeBlock> timeblocks) {
  		for(TimeBlock timeBlock : timeblocks) {
              if (timeBlock.isLunchDeleted()) {
                  continue;
              }
  			TimesheetDocumentHeader doc = TkServiceLocator.getTimesheetDocumentHeaderService().getDocumentHeader(timeBlock.getDocumentId());
  			String dept = TkServiceLocator.getJobService().getJob(doc.getPrincipalId(), timeBlock.getJobNumber(), new java.sql.Date(timeBlock.getBeginTimestamp().getTime())).getDept();
  			DeptLunchRule deptLunchRule = TkServiceLocator.getDepartmentLunchRuleService().getDepartmentLunchRule(dept, timeBlock.getWorkArea(), doc.getPrincipalId(), timeBlock.getJobNumber(), new java.sql.Date(timeBlock.getBeginTimestamp().getTime()));
  			if(timeBlock.getClockLogCreated() && deptLunchRule!= null && deptLunchRule.getDeductionMins() != null && timeBlock.getHours().compareTo(deptLunchRule.getShiftHours()) >= 0) {
                  applyLunchRuleToDetails(timeBlock, deptLunchRule);
  			}
  		}
  	}
  
      private void applyLunchRuleToDetails(TimeBlock block, DeptLunchRule rule) {
          List<TimeHourDetail> details = block.getTimeHourDetails();
          // TODO : Assumption here is that there will be one time hour detail -- May not be accurate.
          if (details.size() == 1) {
              TimeHourDetail detail = details.get(0);
  
              BigDecimal lunchHours = TKUtils.convertMinutesToHours(rule.getDeductionMins());
              BigDecimal newHours = detail.getHours().subtract(lunchHours).setScale(TkConstants.BIG_DECIMAL_SCALE, TkConstants.BIG_DECIMAL_SCALE_ROUNDING);
              detail.setHours(newHours);
  
              TimeHourDetail lunchDetail = new TimeHourDetail();
              lunchDetail.setHours(lunchHours.multiply(TkConstants.BIG_DECIMAL_NEGATIVE_ONE));
              lunchDetail.setEarnCode(TkConstants.LUNCH_EARN_CODE);
              lunchDetail.setTkTimeBlockId(block.getTkTimeBlockId());
              
              //Deduct from total for worked hours
              block.setHours(block.getHours().subtract(lunchHours,TkConstants.MATH_CONTEXT));
              
              details.add(lunchDetail);
          } else {
              // TODO : Determine what to do in this case.
             LOG.warn("Hour details size > 1 in Lunch rule application.");
         }
     }
 
 	public DepartmentLunchRuleDao getDeptLunchRuleDao() {
 		return deptLunchRuleDao;
 	}
 
 
 	public void setDeptLunchRuleDao(DepartmentLunchRuleDao deptLunchRuleDao) {
 		this.deptLunchRuleDao = deptLunchRuleDao;
 	}
 
 	@Override
 	public DeptLunchRule getDepartmentLunchRule(String tkDeptLunchRuleId) {
 		return deptLunchRuleDao.getDepartmentLunchRule(tkDeptLunchRuleId);
 	}
 
 }