/**
    * This file Copyright (c) 2018 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.poc;
  
  import info.magnolia.ui.dev.NoScssCacheVaadinServlet;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.ServletContext;
  import javax.servlet.ServletRegistration;
  import javax.servlet.annotation.WebServlet;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.annotations.Theme;
  import com.vaadin.annotations.VaadinServletConfiguration;
  import com.vaadin.server.ExternalResource;
  import com.vaadin.server.VaadinRequest;
  import com.vaadin.server.VaadinServlet;
  import com.vaadin.ui.Link;
  import com.vaadin.ui.UI;
  import com.vaadin.ui.VerticalLayout;
  
  @Theme("valo")
  public class TestSandboxUI extends UI {
      private static final Logger log = LoggerFactory.getLogger(TestSandboxUI.class);
      private static final String DISPLAY_NAME = "Test Sandbox";
  
      @WebServlet(value = { "/*" }, asyncSupported = true, displayName = DISPLAY_NAME)
      @VaadinServletConfiguration(productionMode = false, ui = TestSandboxUI.class)
      public static class Servlet extends NoScssCacheVaadinServlet {
      }
  
      @Override
      protected void init(VaadinRequest request) {
          setSizeFull();
          VerticalLayout root = new VerticalLayout();
          root.setSpacing(false);
          setContent(root);
  
          getVaadinServlets().entrySet().stream()
                  .filter(entry -> !DISPLAY_NAME.equals(entry.getKey()))
                  .sorted((e1, e2) -> e1.getKey().compareToIgnoreCase(e2.getKey()))
                  .forEach(entry -> {
                      root.addComponent(new Link(entry.getKey(), new ExternalResource(entry.getValue())));
                  });
      }
  
      /**
       * @return a map whose keys are the servlets' display-names (or simple class name as fallback),
       * and whose values are their first servlet mapping (minus eventual trailing wildcard).
       */
      private Map<String, String> getVaadinServlets() {
          Map<String, String> vaadinServlets = new HashMap<>();
          ServletContext servletContext = VaadinServlet.getCurrent().getServletContext();
  
          for (ServletRegistration registration : servletContext.getServletRegistrations().values()) {
              try {
                  Class<?> servletClass = Class.forName(registration.getClassName());
                  if (VaadinServlet.class.isAssignableFrom(servletClass)) {
                      WebServlet annotation = servletClass.getAnnotation(WebServlet.class);
                      String displayName = annotation.displayName();
  
                      if (displayName.isEmpty()) {
                          Class<?> declaringClass = servletClass.getDeclaringClass();
                          if (declaringClass != null && UI.class.isAssignableFrom(declaringClass)) {
                             Class<? extends UI> uiClass = (Class<? extends UI>) declaringClass;
                             displayName = uiClass.getSimpleName();
                         }
                     }
 
                     String mapping = registration.getMappings().iterator().next();
                     int wildcardIndex = mapping.indexOf("/*");
                     if (wildcardIndex > 0) {
                         mapping = mapping.substring(0, wildcardIndex);
                     }
                     String url = servletContext.getContextPath() + mapping;
                     vaadinServlets.put(displayName, url);
                 }
             } catch (ClassNotFoundException e) {
                 log.error("Couldn't get registered servlet class: {}", registration.getClassName(), e);
             }
         }
 
         return vaadinServlets;
     }
 }