/**
    * Copyright 2005-2016 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.krad.uif.layout;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.uif.UifConstants;
  import org.kuali.rice.krad.uif.UifPropertyPaths;
  import org.kuali.rice.krad.uif.component.DataBinding;
  import org.kuali.rice.krad.uif.container.CollectionGroup;
  import org.kuali.rice.krad.uif.control.Control;
  import org.kuali.rice.krad.uif.control.ValueConfiguredControl;
  import org.kuali.rice.krad.uif.field.InputField;
  import org.kuali.rice.krad.uif.field.Field;
  import org.kuali.rice.krad.uif.util.ObjectPropertyUtils;
  import org.kuali.rice.krad.uif.widget.Pager;
  import org.kuali.rice.krad.util.KRADUtils;
  
  import java.util.List;
  
  /**
   * Utilities for collection layout managers
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class CollectionLayoutUtils {
  
      public static void prepareSelectFieldForLine(Field selectField, CollectionGroup collectionGroup, String lineBindingPath,
              Object line) {
          // if select property name set use as property name for select field
          String selectPropertyName = collectionGroup.getLineSelectPropertyName();
          if (StringUtils.isNotBlank(selectPropertyName)) {
              // if select property contains form prefix, will bind to form and not each line
              if (selectPropertyName.startsWith(UifConstants.NO_BIND_ADJUST_PREFIX)) {
                  selectPropertyName = StringUtils.removeStart(selectPropertyName, UifConstants.NO_BIND_ADJUST_PREFIX);
                  ((DataBinding) selectField).getBindingInfo().setBindingName(selectPropertyName);
                  ((DataBinding) selectField).getBindingInfo().setBindToForm(true);
  
                  setControlValueToLineIdentifier(selectField, line);
              } else {
                  ((DataBinding) selectField).getBindingInfo().setBindingName(selectPropertyName);
                  ((DataBinding) selectField).getBindingInfo().setBindByNamePrefix(lineBindingPath);
              }
          } else {
              // select property name not given, use UifFormBase#selectedCollectionLines
              String collectionLineKey = KRADUtils.translateToMapSafeKey(
                      collectionGroup.getBindingInfo().getBindingPath());
              String selectBindingPath = UifPropertyPaths.SELECTED_COLLECTION_LINES + "['" + collectionLineKey + "']";
  
              ((DataBinding) selectField).getBindingInfo().setBindingName(selectBindingPath);
              ((DataBinding) selectField).getBindingInfo().setBindToForm(true);
  
              setControlValueToLineIdentifier(selectField, line);
          }
      }
  
      protected static void setControlValueToLineIdentifier(Field selectField, Object line) {
          if (selectField instanceof InputField) {
              Control selectControl = ((InputField) selectField).getControl();
  
              selectControl.addStyleClass("kr-select-line");
  
              if ((selectControl != null) && (selectControl instanceof ValueConfiguredControl)) {
                  String lineIdentifier =
                          KRADServiceLocatorWeb.getDataObjectMetaDataService().getDataObjectIdentifierString(line);
                  ((ValueConfiguredControl) selectControl).setValue(lineIdentifier);
              }
          }
      }
  
      /**
       * Setup a pagerWidget's values for numberOfPages and currentPage, based on the collection size, displayStart,
       * and displayLength
       *
       * @param pagerWidget the Pager to setup
       * @param collectionGroup  the collectionGroup which uses this Pager
       * @param model the current model
       */
      protected static void setupPagerWidget(Pager pagerWidget, CollectionGroup collectionGroup, Object model){
          List<Object> modelCollection = ObjectPropertyUtils.getPropertyValue(model,
                          collectionGroup.getBindingInfo().getBindingPath());
  
          // The size of the collection divided by the pageLength is used to determine the number of pages for
          // the pager component (ceiling is used if there is not a full page left over in the division)
          if (modelCollection != null) {
              double pages = (double) modelCollection.size() / (double) collectionGroup.getDisplayLength();
             pagerWidget.setNumberOfPages((int) Math.ceil(pages));
         } else {
             pagerWidget.setNumberOfPages(1);
         }
 
         // By using displayStart, currentPage can be determined, the displayLength is added here before division,
         // because the pager is 1-based
         int currentPage = (collectionGroup.getDisplayStart() + collectionGroup.getDisplayLength()) / collectionGroup
                 .getDisplayLength();
         pagerWidget.setCurrentPage(currentPage);
 
         if (StringUtils.isBlank(pagerWidget.getLinkScript())){
             pagerWidget.setLinkScript("retrieveCollectionPage(this, '" + collectionGroup.getId() + "');");
         }
     }
 }