/**
    * This file Copyright (c) 2011 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.templating.elements;
  
  import info.magnolia.cms.beans.config.ServerConfiguration;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.context.WebContext;
  import info.magnolia.jcr.inheritance.InheritanceNodeWrapper;
  import info.magnolia.registry.RegistrationException;
  import info.magnolia.rendering.context.RenderingContext;
  import info.magnolia.rendering.engine.AppendableOnlyOutputProvider;
  import info.magnolia.rendering.engine.RenderException;
  import info.magnolia.rendering.engine.RenderingEngine;
  import info.magnolia.rendering.template.TemplateDefinition;
  import info.magnolia.rendering.template.assignment.TemplateDefinitionAssignment;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  
  import org.apache.commons.lang.StringUtils;
  
  /**
   * Renders a piece of content.
   *
   * @version $Id$
   */
  public class ComponentElement extends AbstractContentTemplatingElement {
  
      private Map<String, Object> contextAttributes = new HashMap<String, Object>();
      private final RenderingEngine renderingEngine;
      private Node content;
      private TemplateDefinitionAssignment templateDefinitionAssignment;
  
      private String dialog;
  
      @Inject
      public ComponentElement(ServerConfiguration server, RenderingContext renderingContext, RenderingEngine renderingEngine, TemplateDefinitionAssignment templateDefinitionAssignment ) {
          super(server, renderingContext);
          this.renderingEngine = renderingEngine;
          this.templateDefinitionAssignment = templateDefinitionAssignment;
      }
  
      @Override
      public void begin(Appendable out) throws IOException, RenderException {
  
          TemplateDefinition componentDefinition = null;
          content = getPassedContent();
  
          if(content == null) {
              throw new RenderException("The 'content' or 'workspace' and 'path' attribute have to be set to rendre a component.");
          }
  
          if(isAdmin()){
              MarkupHelper helper = new MarkupHelper(out);
  
              helper.openComment("cms:component");
  
  
              helper.attribute("content", getNodePath(content));
  
              if(content instanceof InheritanceNodeWrapper) {
                  if (((InheritanceNodeWrapper) content).isInherited()) {
                      helper.attribute("inherited", "true");
                  }
             }
 
             try {
                 componentDefinition = templateDefinitionAssignment.getAssignedTemplateDefinition(content);
             } catch (RegistrationException e) {
                 throw new RenderException("No template definition found for the current content", e);
             }
             if(StringUtils.isEmpty(dialog)) {
                 dialog = resolveDialog(componentDefinition);
             }
             helper.attribute("dialog", dialog);
             helper.append(" -->\n");
         }
 
         // TODO not sure how to pass editable
 
         WebContext webContext = MgnlContext.getWebContext();
         webContext.push(webContext.getRequest(), webContext.getResponse());
         setAttributesInWebContext(contextAttributes, WebContext.LOCAL_SCOPE);
 
 
         try {
             if(componentDefinition != null) {
                 renderingEngine.render(content, componentDefinition, new HashMap<String, Object>(), new AppendableOnlyOutputProvider(out));
             } else {
                 renderingEngine.render(content, new AppendableOnlyOutputProvider(out));
             }
         } finally {
             webContext.pop();
             webContext.setPageContext(null);
             restoreAttributesInWebContext(contextAttributes, WebContext.LOCAL_SCOPE);
         }
     }
 
     @Override
     public void end(Appendable out) throws IOException, RenderException {
         if(isAdmin()){
             new MarkupHelper(out).closeComment("cms:component");
         }
     }
 
     public Map<String, Object> getContextAttributes() {
         return contextAttributes;
     }
 
     public void setContextAttributes(Map<String, Object> contextAttributes) {
         this.contextAttributes = contextAttributes;
     }
 
     private String resolveDialog(TemplateDefinition component) {
         if (StringUtils.isNotEmpty(this.dialog)) {
             return this.dialog;
         }
         String dialog = component.getDialog();
         if (StringUtils.isNotEmpty(dialog)) {
             return dialog;
         }
         return null;
     }
 
     public void setDialog(String dialog) {
         this.dialog = dialog;
     }
 }