/**
    * This file Copyright (c) 2012-2013 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.cms.i18n.Messages;
  import info.magnolia.cms.i18n.MessagesManager;
  import info.magnolia.cms.security.User;
  import info.magnolia.cms.security.operations.OperationPermissionDefinition;
  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.AreaDefinition;
  import info.magnolia.rendering.template.ComponentAvailability;
  import info.magnolia.rendering.template.TemplateDefinition;
  import info.magnolia.rendering.template.assignment.TemplateDefinitionAssignment;
  import info.magnolia.templating.freemarker.AreaDirective;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Renders a piece of content.
   */
  public class ComponentElement extends AbstractContentTemplatingElement {
  
      private static final Logger log = LoggerFactory.getLogger(ComponentElement.class);
  
      private Map<String, Object> contextAttributes = new HashMap<String, Object>();
      private final RenderingEngine renderingEngine;
      private Node content;
      private final TemplateDefinitionAssignment templateDefinitionAssignment;
      private TemplateDefinition componentDefinition;
  
      private boolean renderEditbar = true;
      private String dialog;
      private Boolean editable;
      private Boolean moveable, writable, deletable;
  
      @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 {
  
          content = getPassedContent();
  
          if(content == null) {
              throw new RenderException("The 'content' or 'workspace' and 'path' attribute have to be set to render a component.");
         }
 
         if(isAdmin() && hasPermission(content)){
 
             try {
                 this.componentDefinition = templateDefinitionAssignment.getAssignedTemplateDefinition(content);
             } catch (RegistrationException e) {
                 throw new RenderException("No template definition found for the current content", e);
             }
 
             final Messages messages = MessagesManager.getMessages(componentDefinition.getI18nBasename());
 
             if (isRenderEditbar()) {
                 MarkupHelper helper = new MarkupHelper(out);
 
                 helper.openComment("cms:component");
 
                 helper.attribute(AreaDirective.CONTENT_ATTRIBUTE, getNodePath(content));
 
                 if(content instanceof InheritanceNodeWrapper) {
                     if (((InheritanceNodeWrapper) content).isInherited()) {
                         helper.attribute("inherited", "true");
                     }
                 }
 
                 this.editable = resolveEditable();
                 if (this.editable != null) {
                     helper.attribute("editable", String.valueOf(this.editable));
                 }
 
                 final AreaDefinition areaDefinition = this.getRenderingContext().getParentAreaDefinition();
                 OperationPermissionDefinition permissions = null;
                 User user = null;
 
                 if (areaDefinition != null) {
                     String name = componentDefinition.getName();
                     ComponentAvailability componentAvailability = areaDefinition.getAvailableComponents().get(name);
                     if (componentAvailability != null && componentAvailability.getPermissions() != null) {
                         permissions = componentAvailability.getPermissions();
                         user = MgnlContext.getUser();
                     }
                 }
 
                 this.moveable = this.resolveMoveable(permissions, user);
                 if (this.moveable != null) {
                     helper.attribute(OperationPermissionDefinition.MOVEABLE, String.valueOf(this.moveable));
                 }
 
                 this.writable = this.resolveWritable(permissions, user);
                 if (this.writable != null) {
                     helper.attribute(OperationPermissionDefinition.WRITABLE, String.valueOf(this.writable));
                 }
 
                 this.deletable = this.resolveDeletable(permissions, user);
                 if (this.deletable != null) {
                     helper.attribute(OperationPermissionDefinition.DELETABLE, String.valueOf(this.deletable));
                 }
 
                 if(StringUtils.isEmpty(dialog)) {
                     dialog = resolveDialog();
                 }
                 helper.attribute("dialog", dialog);
 
                 String label = StringUtils.defaultIfEmpty(componentDefinition.getTitle(),componentDefinition.getName());
                 helper.attribute("label", messages.getWithDefault(label, label));
 
                 if(StringUtils.isNotEmpty(componentDefinition.getDescription())){
                     helper.attribute("description", componentDefinition.getDescription());
                 }
                 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);
         }
     }
 
     private boolean hasPermission(Node node) {
         try {
             return node.getSession().hasPermission(node.getPath(), Session.ACTION_SET_PROPERTY);
         } catch (RepositoryException e) {
             log.error("Could not determine permission for node {}", node);
         }
         return false;
     }
 
     private Boolean resolveEditable() {
         return editable != null ? editable : componentDefinition != null && componentDefinition.getEditable() != null ? componentDefinition.getEditable() : null;
     }
 
     private Boolean resolveMoveable(final OperationPermissionDefinition permissions, User user) {
 
         Boolean moveable = this.moveable != null ? this.moveable : componentDefinition != null && componentDefinition.getMoveable() != null ? componentDefinition.getMoveable() : null;
         if (moveable != null || permissions == null) {
             return moveable;
         }
 
         // try to get the permissions from template availability
         if (!permissions.canMove(user)) {
             return false;
         }
         return true; // true by default
     }
 
     private Boolean resolveWritable(final OperationPermissionDefinition permissions, User user) {
 
         Boolean writable = this.writable != null ? this.writable : componentDefinition != null && componentDefinition.getWritable() != null ? componentDefinition.getWritable() : null;
         if (writable != null || permissions == null) {
             return writable;
         }
         // try to get the permissions from template availability
         if (!permissions.canWrite(user)) {
             return false;
         }
         return true; // true by default
     }
 
     private Boolean resolveDeletable(final OperationPermissionDefinition permissions, User user) {
 
         Boolean deletable = this.deletable != null ? this.deletable : componentDefinition != null && componentDefinition.getDeletable() != null ? componentDefinition.getDeletable() : null;
         if (deletable != null || permissions == null) {
             return deletable;
         }
         // try to get the permissions from template availability
         if (!permissions.canDelete(user)) {
             return false;
         }
         return true; // true by default
     }
 
     @Override
     public void end(Appendable out) throws IOException, RenderException {
         if(isAdmin()){
             if (renderEditbar) {
                 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() {
         if (StringUtils.isNotEmpty(this.dialog)) {
             return this.dialog;
         }
         String dialog = componentDefinition.getDialog();
         if (StringUtils.isNotEmpty(dialog)) {
             return dialog;
         }
         return null;
     }
 
     public void setDialog(String dialog) {
         this.dialog = dialog;
     }
 
     public void setEditable(Boolean editable) {
         this.editable = editable;
     }
 
     public Boolean getEditable() {
         return editable;
     }
 
     public boolean isRenderEditbar() {
         return renderEditbar;
     }
 
     public void setRenderEditbar(boolean renderEditbar) {
         this.renderEditbar = renderEditbar;
     }
 }