/*
    * #%L
    * JRst :: Api
    * %%
    * Copyright (C) 2004 - 2010 CodeLutin
    * %%
    * This program is free software: you can redistribute it and/or modify
    * it under the terms of the GNU Lesser General Public License as 
    * published by the Free Software Foundation, either version 3 of the 
   * License, or (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Lesser Public License for more details.
   * 
   * You should have received a copy of the GNU General Lesser Public 
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/lgpl-3.0.html>.
   * #L%
   */
  
  package org.nuiton.jrst.legacy.directive;
  
  import org.nuiton.jrst.JRSTDirective;
  import org.nuiton.jrst.legacy.JRSTLexer;
  import static org.nuiton.jrst.legacy.ReStructuredText.IMAGE;
  import static org.nuiton.jrst.legacy.ReStructuredText.SUBSTITUTION_DEFINITION;
  import org.dom4j.DocumentHelper;
  import org.dom4j.Element;
  import org.dom4j.Node;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * .. image:: picture.jpeg :height: 100 :width: 200 :scale: 50 :alt: alternate
   * text :align: right
   * 
   * Created: 4 nov. 06 12:52:02
   *
   * @author poussin
   * @version $Revision$
   *
   * Last update: $Date$
   * by : $Author$
   */
  public class ImageDirective implements JRSTDirective {
  
      protected static final String SCALE = "scale";
      protected static final String WIDTH = "width";
      protected static final String HEIGHT = "height";
  
      /*
       * (non-Javadoc)
       * 
       * @see org.nuiton.jrst.JRSTDirective#parse(org.dom4j.Element)
       */
      @Override
      public Node parse(Element e) {
          Element result = DocumentHelper.createElement(IMAGE);
  
          if (e.getParent() != null
                  && SUBSTITUTION_DEFINITION.equals(e.getParent().getName())) {
              String ref = e.getParent().attributeValue("name");
              result.addAttribute("alt", ref);
          }
          result.addAttribute("uri", e.attributeValue(JRSTLexer.DIRECTIVE_VALUE));
  
          Pattern arg = Pattern.compile(":([^:]+):\\s*(.*)");
          String[] lines = e.getText().split("\n");
          for (String l : lines) {
              Matcher matcher = arg.matcher(l.trim());
              if (matcher.matches()) {
                  String name = matcher.group(1);
                  String value = matcher.group(2);
                  if (SCALE.equalsIgnoreCase(name)) {
                      if (!result.asXML().matches(".*" + WIDTH + "=\".*\".*")) {
                          result.addAttribute(WIDTH, value + (value.matches(".*%") ? "" : "%"));
                      }
                      if (!result.asXML().matches(".*" + HEIGHT + "=\".*\".*")) {
                          result.addAttribute(HEIGHT, value + (value.matches(".*%") ? "" : "%"));
                      }
                  }
                  result.addAttribute(name, value);
              }
          }
          return result;
      }
  
  }