/**
    * This file is part of the equanda project.
    *
    * The contents of this file are subject to the Mozilla Public License Version 1.1 (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.mozilla.org/MPL/
    *
    * Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
    * ANY KIND, either express or implied. See the License for the specific language governing rights and
   * limitations under the License.
   *
   * Alternatively, the contents of this file may be used under the terms of
   * either the GNU General Public License Version 2 or later (the "GPL"), or
   * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
   * in which case the provisions of the GPL or the LGPL are applicable instead
   * of those above. If you wish to allow use of your version of this file only
   * under the terms of either the GPL or the LGPL, and not to allow others to
   * use your version of this file under the terms of the MPL, indicate your
   * decision by deleting the provisions above and replace them with the notice
   * and other provisions required by the GPL or the LGPL. If you do not delete
   * the provisions above, a recipient may use your version of this file under
   * the terms of any one of the MPL, the GPL or the LGPL.
   */
  
  package org.equanda.tapestry5.components;
  
  import org.apache.tapestry5.*;
  import org.apache.tapestry5.annotations.*;
  import org.apache.tapestry5.corelib.mixins.DiscardBody;
  import org.apache.tapestry5.dom.Element;
  import org.apache.tapestry5.ioc.annotations.Inject;
  import org.apache.tapestry5.ioc.services.SymbolSource;
  import org.apache.tapestry5.ioc.services.TypeCoercer;
  
  /**
   * Text Truncate Component
   *
   * @author <a href="mailto:vladimir.tkachenko@gmail.com">Vladimir Tkachenko</a>
   */
  @IncludeStylesheet( "classpath:/org/equanda/tapestry5/resources/truncate.css" )
  @IncludeJavaScriptLibrary( { "${tapestry.scriptaculous}/prototype.js",
                               "classpath:/org/equanda/tapestry5/resources/t5equanda.js" } )
  @SupportsInformalParameters
  public class Truncate
      implements ClientElement
  {
      /** The text to be truncated */
      @Parameter( required = true, defaultPrefix = BindingConstants.PROP )
      private String text;
  
      /** The max length of the text */
      @Parameter( defaultPrefix = BindingConstants.LITERAL )
      private Integer length;
  
      /** The suffix */
      @Parameter( defaultPrefix = BindingConstants.LITERAL )
      private String suffix;
  
      /** Injects SymbolSource object */
      @Inject
      private SymbolSource symbolSource;
  
      /** Injects TypeCoercer object */
      @Inject
      private TypeCoercer typeCoercer;
  
      /**
       * Default binding for length parameter
       *
       * @return default length
       */
      public Integer defaultLength()
      {
          return typeCoercer.coerce( symbolSource.valueForSymbol( "equanda.truncate.default.length" ), Integer.class );
      }
  
      /**
       * Default binding for suffix parameter
       *
       * @return default suffix
       */
      public String defaultSuffix()
      {
          return symbolSource.valueForSymbol( "equanda.truncate.default.suffix" );
      }
  
      /** Mixin that discards body rendering */
      @Mixin
      @SuppressWarnings( "unused" )
      private DiscardBody discardBody;
  
      @Environmental
      private RenderSupport renderSupport;
  
      @Inject
      private ComponentResources resources;
  
      private String assignedClientId;
  
     /**
      * Truncates text to specified length
      *
      * @return truncated text
      */
     public String getTruncatedText()
     {
         int len = length;
         return text != null && text.length() > len ? ( text.substring( 0, len - suffix.length() ) + suffix ) : text;
     }
 
     public String getClientId()
     {
         return assignedClientId;
     }
 
     @SetupRender
     void setupRender()
     {
         assignedClientId = renderSupport.allocateClientId( resources.getId() ).toLowerCase();
     }
 
     /**
      * Renders truncated text
      *
      * @param writer MarkupWriter used to render truncated text tag
      */
     @BeginRender
     void doBeginRender( MarkupWriter writer )
     {
         String text = getTruncatedText();
         if ( null == text ) text = "";
         writer.element( resources.getElementName() != null ? resources.getElementName() : "span", "id",
                         assignedClientId ).text( text );
         resources.renderInformalParameters( writer );
         writer.end();
     }
 
     /**
      * Renders full text tag
      *
      * @param writer MarkupWriter used to render full text tag
      */
     @AfterRender
     void doAfterRender( MarkupWriter writer )
     {
         if ( text != null && text.length() > length )
         {
             Element root = writer.getDocument().getRootElement();
             Element body = null;
             if ( root != null )
             {
                 if ( root.getName().equals( "html" ) )
                 {
                     body = root.find( "body" );
                 }
             }
             String[] args = new String[]{ "class", "eqTrunCt", "id", assignedClientId + "_text",
                                           "style", "visibility: hidden; top: -1000px; left: 0;" };
             if ( body != null )
             {
                 Element element = body.element( "div", args );
                 element.text( text );
             }
             else
             {
                 Element element = writer.element( "div", (Object[]) args );
                 element.text( text );
                 writer.end();
             }
             renderSupport.addScript( "eqTruncInit('%s'); ", assignedClientId );
         }
     }
 
 }