package org.kuali.student.lum.course.service.utils;
   
   import java.util.ArrayList;
   import java.util.List;
   import java.util.Stack;
   
   import org.kuali.student.common.dictionary.dto.FieldDefinition;
   import org.kuali.student.common.dictionary.dto.ObjectStructureDefinition;
   import org.kuali.student.common.util.MessageUtils;
  import org.kuali.student.common.validation.dto.ValidationResultInfo;
  import org.kuali.student.common.validator.DefaultValidatorImpl;
  import org.kuali.student.core.atp.dto.AtpInfo;
  import org.kuali.student.core.atp.service.AtpService;
  import org.kuali.student.lum.course.dto.CourseInfo;
  
  public class ActiveDatesValidator extends DefaultValidatorImpl {
  	private AtpService atpService;
  
  	@Override
  	public List<ValidationResultInfo> validateObject(Object data,
  			ObjectStructureDefinition objStructure) {
  		// Custom validators are required to only override the other
  		// validateObject method
  		return null;
  	}
  
  	@Override
  	public List<ValidationResultInfo> validateObject(FieldDefinition field,
  			Object o, ObjectStructureDefinition objStructure,
  			Stack<String> elementStack) {
  		//Get ATPs and compare dates.  If the end is <= the start, throw a validation error.
  		List<ValidationResultInfo> results = new ArrayList<ValidationResultInfo>();
  		if (o instanceof CourseInfo) {
  			CourseInfo course = (CourseInfo) o;
  			if (course.getEndTerm() != null && course.getStartTerm() != null) {
  				try {
  					AtpInfo startAtp = atpService.getAtp(course.getStartTerm());
  					AtpInfo endAtp = atpService.getAtp(course.getEndTerm());
  					if (startAtp.getStartDate()
  							.compareTo(endAtp.getStartDate()) > 0) {
  						ValidationResultInfo vr = new ValidationResultInfo();
  						vr.setElement(field.getName());
  						vr.setError("validation.endDateAfterStartDate");
  						results.add(vr);
  					}
  				} catch (Exception e) {
  					throw new RuntimeException("Error validating.", e);
  				}
  
  			}
  		}
  		return results;
  	}
  
  	public void setAtpService(AtpService atpService) {
  		this.atpService = atpService;
  	}
  
  }