/**
    * 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.student.contract.model.validation;
  
  import org.kuali.student.contract.model.Constraint;
  import org.kuali.student.contract.model.DictionaryModel;
  import org.kuali.student.contract.model.Field;
  import org.kuali.student.contract.model.XmlType;
  import org.kuali.student.contract.model.util.ModelFinder;
  
  import java.util.Collection;
  
  /**
   * This validates a single field definition
   * @author nwright
   */
  public class FieldValidator implements ModelValidator {
  
      private Field field;
      private DictionaryModel model;
  
      public FieldValidator(Field field, DictionaryModel sheet) {
          this.field = field;
          this.model = sheet;
      }
      private Collection errors;
  
      @Override
      public Collection<String> validate() {
          ConstraintValidator cv =
                  new ConstraintValidator(field.getInlineConstraint());
          errors = cv.validate();
          if (field.getPrimitive().equalsIgnoreCase(XmlType.COMPLEX)) {
              validateComplexConstraint(field.getInlineConstraint());
              for (String id : field.getConstraintIds()) {
                  Constraint cons = findConstraint(id);
                  if (cons != null) {
                      validateComplexConstraint(cons);
                  }
              }
          }
          return errors;
      }
  
      private Constraint findConstraint(String id) {
          Constraint cons = new ModelFinder(model).findConstraint(id);
          if (cons != null) {
              return cons;
          }
          addError("Field constraint id, " + id
                  + " is not defined in the bank of constraints");
          return null;
      }
  
      private void validateComplexConstraint(Constraint cons) {
          if (!cons.getMinLength().equals("")) {
              addError("A minLength is not allowed on a complex field");
          }
          if (!cons.getMaxLength().equals("")) {
              addError("A maxLength is not allowed on a complex field");
          }
          if (!cons.getMinValue().equals("")) {
              addError("A minValue is not allowed on a complex field");
          }
          if (!cons.getMaxValue().equals("")) {
              addError("A maxValue is not allowed on a complex field");
          }
          if (!cons.getValidChars().equals("")) {
              addError("A validChars is not allowed on a complex field");
          }
          if (!cons.getLookup().equals("")) {
              addError("A lookup value is not allowed on a complex field");
          }
      }
  
      private void addError(String msg) {
          String error = "Error in field " + field.getId() + ": " + msg;
          if (!errors.contains(error)) {
              errors.add(error);
          }
      }
  }