/**
    * Copyright 2005-2013 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.rice.krad.uif.layout;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.datadictionary.parse.BeanTag;
  import org.kuali.rice.krad.datadictionary.parse.BeanTagAttribute;
  import org.kuali.rice.krad.datadictionary.parse.BeanTags;
  import org.kuali.rice.krad.uif.CssConstants;
  import org.kuali.rice.krad.uif.CssConstants.Padding;
  import org.kuali.rice.krad.uif.UifConstants.Orientation;
  import org.kuali.rice.krad.uif.component.Component;
  import org.kuali.rice.krad.uif.container.Container;
  import org.kuali.rice.krad.uif.view.View;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Layout manager that organizes components in a single row (horizontal) or
   * column (vertical)
   *
   * <p>
   * Although a table based template could be used, setup is done to also support
   * a CSS based template. The items in the <code>Container</code> instance are
   * rendered sequentially wrapping each one with a span element. The padding
   * property can be configured to space the elements as needed. To achieve a
   * vertical orientation, the span style is set to block. Additional styling can
   * be set for the items by using the itemSpanStyle property.
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  @BeanTags({@BeanTag(name = "boxLayout-bean", parent = "Uif-BoxLayoutBase"),
          @BeanTag(name = "horizontalBoxLayout-bean", parent = "Uif-HorizontalBoxLayout"),
          @BeanTag(name = "verticalBoxLayout-bean", parent = "Uif-VerticalBoxLayout")})
  public class BoxLayoutManager extends LayoutManagerBase {
      private static final long serialVersionUID = 4467342272983290044L;
  
      private Orientation orientation;
      private String padding;
  
      private String itemStyle;
      private List<String> itemStyleClasses;
  
      public BoxLayoutManager() {
          super();
  
          itemStyle = "";
          orientation = Orientation.HORIZONTAL;
          itemStyleClasses = new ArrayList<String>();
      }
  
      /**
       * Sets the item span style
       *
       * @see org.kuali.rice.krad.uif.layout.LayoutManagerBase#performFinalize(org.kuali.rice.krad.uif.view.View,
       *      java.lang.Object, org.kuali.rice.krad.uif.container.Container)
       */
      @Override
      public void performFinalize(View view, Object model, Container container) {
          super.performFinalize(view, model, container);
  
          if (StringUtils.isBlank(itemStyle)) {
              itemStyle = "";
          }
  
          if (StringUtils.isNotEmpty(padding)) {
              if (orientation.equals(Orientation.VERTICAL)) {
                  // set item to block which will cause a line break and margin
                  // bottom for padding
                  itemStyle += CssConstants.getCssStyle(Padding.PADDING_BOTTOM, padding);
              } else {
                  // set margin right for padding
                  itemStyle += CssConstants.getCssStyle(Padding.PADDING_RIGHT, padding);
              }
          }
  
          // classes to identify this layout in jQuery and to clear the float correctly in all browsers
          this.addStyleClass("clearfix");
  
          for (Component c : container.getItems()) {
              if (c != null) {
                  // add item styles to the the item
                  List<String> styleClasses = c.getCssClasses();
                  if (orientation.equals(Orientation.HORIZONTAL)) {
                     styleClasses.add("uif-boxLayoutHorizontalItem");
                     styleClasses.addAll(this.getItemStyleClasses());
                 } else {
                     styleClasses.add("uif-boxLayoutVerticalItem");
                     styleClasses.addAll(this.getItemStyleClasses());
                     styleClasses.add("clearfix");
                 }
                 c.setCssClasses(styleClasses);
 
                 if (c.getStyle() != null && !c.getStyle().endsWith(";")) {
                     c.appendToStyle(";" + this.getItemStyle());
                 } else {
                     c.appendToStyle(this.getItemStyle());
                 }
             }
         }
     }
 
     /**
      * Indicates whether the components should be rendered in a horizontal or
      * vertical column
      *
      * @return Orientation orientation configured for layout
      */
     @BeanTagAttribute(name = "orientation", type = BeanTagAttribute.AttributeType.SINGLEBEAN)
     public Orientation getOrientation() {
         return this.orientation;
     }
 
     /**
      * Setter for the orientation for layout
      *
      * @param orientation
      */
     public void setOrientation(Orientation orientation) {
         this.orientation = orientation;
     }
 
     /**
      * Amount of separation between each item
      *
      * <p>
      * For horizontal orientation, this will be the right padding for each item.
      * For vertical, it will be the bottom padding for each item. The value can
      * be a fixed length (like px) or percentage
      * </p>
      *
      * @return String
      */
     @BeanTagAttribute(name = "padding")
     public String getPadding() {
         return this.padding;
     }
 
     /**
      * Setter for the item padding
      *
      * @param padding
      */
     public void setPadding(String padding) {
         this.padding = padding;
     }
 
     /**
      * Used by the render to set the style on the span element that wraps the
      * item. By using a wrapping span the items can be aligned based on the
      * orientation and given the correct padding
      *
      * @return String css style string
      */
     @BeanTagAttribute(name = "itemStyle")
     public String getItemStyle() {
         return this.itemStyle;
     }
 
     /**
      * Setter for the span style
      *
      * @param itemStyle
      */
     public void setItemStyle(String itemStyle) {
         this.itemStyle = itemStyle;
     }
 
     /**
      * List of style classes that should be applied to each span that wraps the item in the layout
      *
      * @return List<String>
      */
     @BeanTagAttribute(name = "itemStyleClasses", type = BeanTagAttribute.AttributeType.LISTVALUE)
     public List<String> getItemStyleClasses() {
         return itemStyleClasses;
     }
 
     /**
      * Setter for the list of style classes that should apply to each item span
      *
      * @param itemStyleClasses
      */
     public void setItemStyleClasses(List<String> itemStyleClasses) {
         this.itemStyleClasses = itemStyleClasses;
     }
 
     /**
      * Builds the HTML class attribute string by combining the item styleClasses list
      * with a space delimiter
      *
      * @return String class attribute string
      */
     public String getItemStyleClassesAsString() {
         if (itemStyleClasses != null) {
             return StringUtils.join(itemStyleClasses, " ");
         }
 
         return "";
     }
 
 }