/**
    * This file Copyright (c) 2008-2010 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.module.rssaggregator;
  
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.NodeData;
  import info.magnolia.cms.gui.control.Button;
  import info.magnolia.cms.gui.control.ControlImpl;
  import info.magnolia.cms.gui.dialog.DialogBox;
  import info.magnolia.freemarker.FreemarkerUtil;
  
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.io.Writer;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import javax.jcr.PathNotFoundException;
  import javax.jcr.RepositoryException;
  
  import org.apache.commons.lang.BooleanUtils;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Common class for creating combined multi controls.
   * @author had
   *
   */
  public abstract class MultiControl extends DialogBox implements MultiValueControl {
      private static final Logger log = LoggerFactory.getLogger(MultiControl.class);
  
      /**
       * Create the object to initialize the table.
       */
      public String getJSON() {
          final List<String> values = this.getValues();
  
          if (values.size() == 0) {
              return getEmpty();
          }
  
          // enclose each value with {}
          final List<String> objects = new ArrayList<String>();
          for (Iterator<String> iter = values.iterator(); iter.hasNext();) {
              final String value = iter.next();
              log.debug("value:" + value);
              objects.add("{" + value + "}");
          }
          return "[" + StringUtils.join(objects.iterator(), ",") + "]";
      }
  
      protected abstract String getEmpty();
  
      protected List<String> readValues() {
          List<String> values = new ArrayList<String>();
          if (this.getStorageNode() != null) {
              try {
                  Content data = this.getStorageNode().getContent(getName());
                  Iterator<Content> iter = data.getChildren().iterator();
                  while (iter.hasNext()) {
                      Content value = iter.next();
                      Iterator<NodeData> dataVals = value.getNodeDataCollection().iterator();
                      StringBuffer buf = new StringBuffer();
                      while (dataVals.hasNext()) {
                          NodeData partial = dataVals.next();
                         if (buf.length() > 0) {
                             buf.append(",");
                         }
                             buf.append(partial.getName()).append(":'").append(partial.getString()).append("'");
                     }
                     values.add(buf.toString());
                 }
             } catch (PathNotFoundException e) {
                 // not yet existing: OK
             }
             catch (RepositoryException re) {
                 log.error("can't set values", re);
             }
         }
         return values;
     }
 
     public void drawHtml(Writer w) throws IOException {
         PrintWriter out = (PrintWriter) w;
         this.drawHtmlPre(out);
         out.write(FreemarkerUtil.process(MultiControl.class, this));
         this.drawHtmlPost(out);
 
     }
 
     public String getSaveInfo() {
         Boolean renderSaveInfo = BooleanUtils.toBooleanObject(this.getConfigValue("saveInfo"));
         if (BooleanUtils.toBooleanDefaultIfNull(renderSaveInfo, true)) {
             ControlImpl dummy = new ControlImpl(this.getName(), (String) null);
             //dummy.setValueType(ControlImpl.VALUETYPE_MULTIPLE);
             return dummy.getHtmlSaveInfo();
         }
         // don' create the save info
         return "";
     }
 
     /**
      * The button to add a new row.
      */
     public String getAddButton() {
         Button add = new Button();
         add.setLabel(getMessage("buttons.add"));
         add.setOnclick(this.getName() + "DynamicTable.addNew();");
         add.setSmall(true);
         return add.getHtml();
     }
 
     /**
      * Button for deleting a row.
      */
     public String getDeleteButton() {
         Button delete = new Button();
         delete.setLabel(this.getMessage("buttons.delete"));
         delete.setOnclick(this.getName() + "DynamicTable.del('${index}');" + this.getName() + "DynamicTable.persist();");
         delete.setSmall(true);
         return delete.getHtml();
     }
 
     /**
      * If the values are saved using the valueType multiple, we can not use the same name for the hidden field we use
      * for persisting the data.
      * @return the name of the hidden field
      */
     public String getHiddenFieldName() {
         return this.getName();
     }
 
     /**
      * JS function used to create an object out of the input fields.
      */
     public String getGetObjectFunction() {
         return "function(prefix, index){" +
         " var obj = new Object();" +
         " obj.link = document.getElementById(prefix + '_link').value;" +
         " obj.title = document.getElementById(prefix + '_title').value; " +
         " return obj;" +
         "}";
     }
 
     /**
      * JS function used to create a new empty object.
      */
     public String getNewObjectFunction() {
         return "function(){" +
         " var obj = new Object();" +
         " obj.link = ''; " +
         " obj.title = ''; " +
         " return obj;" +
         "}";
     }
 }