/**
    * 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.component.Component;
  import org.kuali.rice.krad.uif.container.Container;
  import org.kuali.rice.krad.uif.container.Group;
  import org.kuali.rice.krad.uif.view.View;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Layout manager that organizes its components in a table based grid
   *
   * <p>
   * Items are laid out from left to right (with each item taking up one column)
   * until the configured number of columns is reached. If the item count is
   * greater than the number of columns, a new row will be created to render the
   * remaining items (and so on until all items are placed). Labels for the fields
   * can be pulled out (default) and rendered as a separate column. The manager
   * also supports the column span and row span options for the field items. If
   * not specified the default is 1.
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  @BeanTags({@BeanTag(name = "gridLayout-bean", parent = "Uif-GridLayoutBase"),
          @BeanTag(name = "twoColumnGridLayout-bean", parent = "Uif-TwoColumnGridLayout"),
          @BeanTag(name = "fourColumnGridLayout-bean", parent = "Uif-FourColumnGridLayout"),
          @BeanTag(name = "sixColumnGridLayout-bean", parent = "Uif-SixColumnGridLayout")})
  public class GridLayoutManager extends LayoutManagerBase {
      private static final long serialVersionUID = 1890011900375071128L;
  
      private int numberOfColumns;
  
      private boolean suppressLineWrapping;
      private boolean applyAlternatingRowStyles;
      private boolean applyDefaultCellWidths;
      private boolean renderFirstRowHeader;
      private boolean renderAlternatingHeaderColumns;
      private boolean renderRowFirstCellHeader;
  
      private List<String> rowCssClasses;
  
      public GridLayoutManager() {
          super();
  
          rowCssClasses = new ArrayList<String>();
      }
  
      /**
       * The following finalization is performed:
       *
       * <ul>
       * <li>If suppressLineWrapping is true, sets the number of columns to the
       * container's items list size</li>
       * <li>Adjust the cell attributes for the container items</li>
       * </ul>
       *
       * @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 (suppressLineWrapping) {
              numberOfColumns = container.getItems().size();
          }
  
          for (Component component : container.getItems()) {
              if (this instanceof TableLayoutManager) {
                  component.addCellCssClass("uif-gridLayoutCell");
              }
              setCellAttributes(component);
          }
      }
  
      /**
       * Moves the width, align, and valign settings of the component to the corresponding cell properties (if not
      * already configured)
      * 
      * @param component instance to adjust settings for
      */
     protected void setCellAttributes(Component component) {
         if (StringUtils.isNotBlank(component.getWidth()) && StringUtils.isBlank(component.getCellWidth())) {
             component.setCellWidth(component.getWidth());
             component.setWidth("");
         }
 
         if (StringUtils.isNotBlank(component.getAlign()) && !StringUtils.contains(component.getCellStyle(),
                 CssConstants.TEXT_ALIGN)) {
             if (component.getCellStyle() == null) {
                 component.setCellStyle("");
             }
 
             component.setCellStyle(component.getCellStyle() + CssConstants.TEXT_ALIGN + component.getAlign() + ";");
             component.setAlign("");
         }
 
         if (StringUtils.isNotBlank(component.getValign()) && !StringUtils.contains(component.getCellStyle(),
                 CssConstants.VERTICAL_ALIGN)) {
             if (component.getCellStyle() == null) {
                 component.setCellStyle("");
             }
 
             component.setCellStyle(
                     component.getCellStyle() + CssConstants.VERTICAL_ALIGN + component.getValign() + ";");
             component.setValign("");
         }
     }
 
     /**
      * @see LayoutManagerBase#getSupportedContainer()
      */
     @Override
     public Class<? extends Container> getSupportedContainer() {
         return Group.class;
     }
 
     /**
      * Indicates the number of columns that should make up one row of data
      *
      * <p>
      * If the item count is greater than the number of columns, a new row will
      * be created to render the remaining items (and so on until all items are
      * placed).
      * </p>
      *
      * <p>
      * Note this does not include any generated columns by the layout manager,
      * so the final column count could be greater (if label fields are
      * separate).
      * </p>
      *
      * @return int
      */
     @BeanTagAttribute(name = "numberOfColumns")
     public int getNumberOfColumns() {
         return this.numberOfColumns;
     }
 
     /**
      * Setter for the number of columns (each row)
      *
      * @param numberOfColumns
      */
     public void setNumberOfColumns(int numberOfColumns) {
         this.numberOfColumns = numberOfColumns;
     }
 
     /**
      * Indicates whether the number of columns for the table data should match
      * the number of fields given in the container's items list (so that each
      * field takes up one column without wrapping), this overrides the configured
      * numberOfColumns
      *
      * <p>
      * If set to true during the initialize phase the number of columns will be
      * set to the size of the container's field list, if false the configured
      * number of columns is used
      * </p>
      *
      * @return true if the column count should match the container's
      *         field count, false to use the configured number of columns
      */
     @BeanTagAttribute(name = "suppressLineWrapping")
     public boolean isSuppressLineWrapping() {
         return this.suppressLineWrapping;
     }
 
     /**
      * Setter for the suppressLineWrapping indicator
      *
      * @param suppressLineWrapping
      */
     public void setSuppressLineWrapping(boolean suppressLineWrapping) {
         this.suppressLineWrapping = suppressLineWrapping;
     }
 
     /**
      * Indicates whether alternating row styles should be applied
      *
      * <p>
      * Indicator to layout manager templates to apply alternating row styles.
      * See the configured template for the actual style classes used
      * </p>
      *
      * @return true if alternating styles should be applied, false if
      *         all rows should have the same style
      */
     @BeanTagAttribute(name = "applyAlternatingRowStyles")
     public boolean isApplyAlternatingRowStyles() {
         return this.applyAlternatingRowStyles;
     }
 
     /**
      * Setter for the alternating row styles indicator
      *
      * @param applyAlternatingRowStyles
      */
     public void setApplyAlternatingRowStyles(boolean applyAlternatingRowStyles) {
         this.applyAlternatingRowStyles = applyAlternatingRowStyles;
     }
 
     /**
      * Indicates whether the manager should default the cell widths
      *
      * <p>
      * If true, the manager will set the cell width by equally dividing by the
      * number of columns
      * </p>
      *
      * @return true if default cell widths should be applied, false if
      *         no defaults should be applied
      */
     @BeanTagAttribute(name = "applyDefaultCellWidths")
     public boolean isApplyDefaultCellWidths() {
         return this.applyDefaultCellWidths;
     }
 
     /**
      * Setter for the default cell width indicator
      *
      * @param applyDefaultCellWidths
      */
     public void setApplyDefaultCellWidths(boolean applyDefaultCellWidths) {
         this.applyDefaultCellWidths = applyDefaultCellWidths;
     }
 
     /**
      * Indicates whether the first cell of each row should be rendered as a header cell (th)
      *
      * <p>
      * When this flag is turned on, the first cell for each row will be rendered as a header cell. If
      * {@link #isRenderAlternatingHeaderColumns()} is false, the remaining cells for the row will be rendered
      * as data cells, else they will alternate between cell headers
      * </p>
      *
      * @return true if first cell of each row should be rendered as a header cell
      */
     @BeanTagAttribute(name = "renderRowFirstCellHeader")
     public boolean isRenderRowFirstCellHeader() {
         return renderRowFirstCellHeader;
     }
 
     /**
      * Setter for render first row column as header indicator
      *
      * @param renderRowFirstCellHeader
      */
     public void setRenderRowFirstCellHeader(boolean renderRowFirstCellHeader) {
         this.renderRowFirstCellHeader = renderRowFirstCellHeader;
     }
 
     /**
      * Indicates whether the first row of items rendered should all be rendered as table header (th) cells
      *
      * <p>
      * Generally when using a grid layout all the cells will be tds or alternating th/td (with the label in the
      * th cell). However in some cases it might be desired to display the labels in one row as table header cells (th)
      * followed by a row with the corresponding fields in td cells. When this is enabled this type of layout is
      * possible
      * </p>
      *
      * @return true if first row should be rendered as header cells
      */
     @BeanTagAttribute(name = "renderFirstRowHeader")
     public boolean isRenderFirstRowHeader() {
         return renderFirstRowHeader;
     }
 
     /**
      * Setter for the first row as header indicator
      *
      * @param renderFirstRowHeader
      */
     public void setRenderFirstRowHeader(boolean renderFirstRowHeader) {
         this.renderFirstRowHeader = renderFirstRowHeader;
     }
 
     /**
      * Indicates whether header columns (th for tables) should be rendered for
      * every other item (alternating)
      *
      * <p>
      * If true the first cell of each row will be rendered as an header, with
      * every other cell in the row as a header
      * </p>
      *
      * @return true if alternating headers should be rendered, false if not
      */
     @BeanTagAttribute(name = "renderAlternatingHeaderColumns")
     public boolean isRenderAlternatingHeaderColumns() {
         return this.renderAlternatingHeaderColumns;
     }
 
     /**
      * Setter for the render alternating header columns indicator
      *
      * @param renderAlternatingHeaderColumns
      */
     public void setRenderAlternatingHeaderColumns(boolean renderAlternatingHeaderColumns) {
         this.renderAlternatingHeaderColumns = renderAlternatingHeaderColumns;
     }
 
     /**
      * The list of styles for each row
      *
      * <p>
      * Each entry in the list gives the style for the row with the same index. This style will be added the the <tr>
      * tag
      * when the table rows are rendered in the grid.tag. This is used to store the styles for newly added lines and
      * other special cases like the add item row.
      * </p>
      *
      * @return list of styles for the rows
      */
     @BeanTagAttribute(name = "rowCssClasses", type = BeanTagAttribute.AttributeType.LISTVALUE)
     public List<String> getRowCssClasses() {
         return rowCssClasses;
     }
 
     /**
      * Setter for the list that stores the css style names of each row
      *
      * @param rowCssClasses
      */
     public void setRowCssClasses(List<String> rowCssClasses) {
         this.rowCssClasses = rowCssClasses;
     }
 }