/**
    * Copyright 2005-2015 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.rice.krms.impl.repository;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.kuali.rice.krad.inquiry.InquirableImpl;
  import org.kuali.rice.krad.uif.component.Component;
  import org.kuali.rice.krad.uif.container.Container;
  import org.kuali.rice.krad.uif.container.Group;
  import org.kuali.rice.krad.uif.element.Message;
  import org.kuali.rice.krad.uif.field.SpaceField;
  import org.kuali.rice.krad.uif.layout.GridLayoutManager;
  import org.kuali.rice.krad.uif.util.ComponentFactory;
  import org.kuali.rice.krad.uif.view.ViewModel;
  import org.kuali.rice.krad.web.form.InquiryForm;
  import org.kuali.rice.krms.api.repository.proposition.PropositionType;
  
  /**
   * This class is responsible for building the recursive components on the Rule Inquiry View.
   */
  public class RuleStudentInquiryViewHelperServiceImpl extends InquirableImpl {
  
      private static int ID = 1;
  
      private static final String PROPOSITION_GROUP_ID = "propositionGroup";
  
      private static final String PROPOSITION_ID = "proposition";
  
      private enum Operator {
          OR("|"), AND("&");
  
          private String code;
  
          Operator(String code) {
              this.code = code;
          }
  
          private static Operator fromCode(String code) {
              if (code == null) {
                  return null;
              }
              for (Operator operator : values()) {
                  if (operator.code.equals(code)) {
                      return operator;
                  }
              }
              throw new IllegalArgumentException("Failed to locate the Operator with the given code: " + code);
          }
      }
  
  
  
      @Override
      public void addCustomContainerComponents(ViewModel model, Container container) {
          if (PROPOSITION_GROUP_ID.equals(container.getId())) {
              RuleBo ruleDataObj = (RuleBo)((InquiryForm)model).getDataObject();
              PropositionBo proposition = ruleDataObj.getProposition();
              if (proposition != null) {
                  if (PropositionType.COMPOUND.getCode().equals(proposition.getPropositionTypeCode())) {
                      List<Component> groups = new ArrayList<Component>();
                      handleCompoundPropositions(groups, proposition);
                      container.setItems(groups);
                  } else {
                      Message simplePropName = ComponentFactory.getMessage();
                      simplePropName.setId(PROPOSITION_ID + "_" + ID++);
                      simplePropName.setMessageText(proposition.getDescription());
                      List<Message> simpleProps = new ArrayList<Message>();
                      simpleProps.add(simplePropName);
                      container.setItems(simpleProps);
                  }
              }
          }
      }
  
      private void handleCompoundPropositions(List<Component> components, PropositionBo proposition) {
          Group compoundGroup = getPropositionGroup();
          compoundGroup.setId(String.valueOf(PROPOSITION_GROUP_ID + "_" + ID++));
          ((GridLayoutManager)compoundGroup.getLayoutManager()).setNumberOfColumns(2);
  
          List<Component> componentItems = new ArrayList<Component>();
  
          //Heading
          Message propositionName = ComponentFactory.getMessage();
          propositionName.setId(PROPOSITION_ID + "_" + ID++);
         propositionName.setMessageText(proposition.getDescription());
 
         componentItems.add(propositionName);
 
         //Space (for layout purposes)
         SpaceField spaceField1 = ComponentFactory.getSpaceField();
         spaceField1.setId("space" + "_" + ID++);
         componentItems.add(spaceField1);
 
         //Space (for layout purposes)
         SpaceField spaceField2 = ComponentFactory.getSpaceField();
         spaceField2.setId("space" + "_" + ID++);
         componentItems.add(spaceField2);
 
         if (proposition.getCompoundComponents() != null) {
             int loopCounter = 0;
             for (PropositionBo nestedProposition : proposition.getCompoundComponents()) {
                 if (loopCounter != 0) {
 
                     //Space (for layout purposes)
                     SpaceField spaceField3 = ComponentFactory.getSpaceField();
                     spaceField3.setId("space" + "_" + ID++);
                     componentItems.add(spaceField3);
 
                     Message operator = ComponentFactory.getMessage();
                     operator.setId(PROPOSITION_ID + "_" + ID++);
                     operator.setMessageText(Operator.fromCode(proposition.getCompoundOpCode()).toString());
                     componentItems.add(operator);
 
                     //Space (for layout purposes)
                     SpaceField spaceField4 = ComponentFactory.getSpaceField();
                     spaceField4.setId("space" + "_" + ID++);
                     componentItems.add(spaceField4);
                 }
                 if (PropositionType.COMPOUND.getCode().equals(nestedProposition.getPropositionTypeCode())) {
                     handleCompoundPropositions(components, nestedProposition);
                 } else {
                     Message simplePropName = ComponentFactory.getMessage();
                     simplePropName.setId(PROPOSITION_ID + "_" + ID++);
                     simplePropName.setMessageText(nestedProposition.getDescription());
 
                     componentItems.add(simplePropName);
                 }
                 loopCounter++;
             }
         }
         compoundGroup.setItems(componentItems);
 
         components.add(compoundGroup);
     }
 
     private static Group getPropositionGroup() {
         Group group = (Group) ComponentFactory.getGroupGridBodyOnly();
         group.getDisclosure().setId(String.valueOf(ID++));
         return group;
     }
 
 }