/**********************************************
    * Copyright (C) 2010 Lukas Laag
    * This file is part of lib-gwt-svg.
    * 
    * libgwtsvg 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.
    * 
   * libgwtsvg 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 Lesser General Public License for more details.
   * 
   * You should have received a copy of the GNU Lesser General Public License
   * along with libgwtsvg.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.dev.svg.impl.gen;
  
  import org.vectomatic.dom.svg.ui.SVGResource;
  import org.vectomatic.dom.svg.utils.OMSVGParser;
  import org.vectomatic.dom.svg.utils.SVGConstants;
  import org.w3c.dom.Element;
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  
  import com.google.gwt.core.ext.UnableToCompleteException;
  import com.google.gwt.core.ext.typeinfo.JClassType;
  import com.google.gwt.uibinder.elementparsers.ElementParser;
  import com.google.gwt.uibinder.elementparsers.SvgInterpreter;
  import com.google.gwt.uibinder.rebind.UiBinderWriter;
  import com.google.gwt.uibinder.rebind.XMLElement;
  
  public class SVGImageParser implements ElementParser {
  	private static final String ATTR_RESOURCE = "resource";
  	private static final String ATTR_VALIDATED = "validated";
  	public SVGImageParser() {
  	}
  
  	@Override
  	public void parse(XMLElement elem, String fieldName, JClassType type,
  			UiBinderWriter writer) throws UnableToCompleteException {
  		if (elem.hasAttribute(ATTR_RESOURCE) && elem.hasChildNodes()) {
  			writer.die("In %s, attribute \"%s\" and inline svg are mutually exclusive", elem, ATTR_RESOURCE);
  		}
  		if (!(elem.hasAttribute(ATTR_RESOURCE) || elem.hasChildNodes())) {
  			writer.die("In %s, attribute \"%s\" or inline svg must be present", elem, ATTR_RESOURCE);
  		}
  		if (elem.hasAttribute(ATTR_RESOURCE)) {
  		    JClassType svgResourceType = writer.getOracle().findType(SVGResource.class.getCanonicalName());
  			String resource = elem.consumeAttribute(ATTR_RESOURCE, svgResourceType); 
  			writer.addStatement("%s.setResource(%s);", fieldName, resource);		
  		} else {
  			boolean validated = true;
  			if (elem.hasAttribute(ATTR_VALIDATED)) {
  				String value = elem.consumeBooleanAttribute(ATTR_VALIDATED);
  				validated = Boolean.valueOf(value);
  			}
  			Element container = elem.getElement();
  			NodeList childNodes = container.getChildNodes();
  			Element root = null;
  			for (int i = 0, length = childNodes.getLength(); i < length; i++) {
  				Node node = childNodes.item(i);
  				if (node.getNodeType() == Node.ELEMENT_NODE) {
  					if (root == null 
  					&& SVGConstants.SVG_NAMESPACE_URI.equals(node.getNamespaceURI()) 
  					&& SVGConstants.SVG_SVG_TAG.equals(node.getLocalName())) {
  						root = (Element)node;
  					} else {
  						writer.die("In %s, attribute \"%s\" or inline svg must be present", elem, ATTR_RESOURCE);
  					}
  				}
  			}
  			if (root == null) {
  				writer.die("In %s, attribute \"%s\" or inline svg must be present", elem, ATTR_RESOURCE);
  			}
  		    writer.beginAttachedSection(fieldName + ".getElement()");
  	        SvgInterpreter interpreter = SvgInterpreter.newInterpreterForUiObject(writer, fieldName, root);
  	        String rawSvg = elem.consumeInnerHtml(interpreter);
  	        if (validated) {
  	        	SVGValidator.validate(rawSvg, elem.getLocation().getSystemId(), null, writer);
  	        }
  	        String omSvgParser = OMSVGParser.class.getName();
  			writer.addStatement("%s.setSvgElement(%s.parse(\"%s\"));", fieldName, omSvgParser, rawSvg);
  			writer.endAttachedSection();
  		}
  	}
  
  }