/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.commons.jcs.jcache.extras.web;
  
  import static org.junit.Assert.assertEquals;
  
  import java.io.File;
  import java.io.IOException;
  import java.net.URL;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.catalina.Context;
  import org.apache.catalina.LifecycleException;
  import org.apache.catalina.LifecycleState;
  import org.apache.catalina.core.StandardContext;
  import org.apache.catalina.deploy.FilterDef;
  import org.apache.catalina.deploy.FilterMap;
  import org.apache.catalina.startup.Tomcat;
  import org.apache.commons.io.IOUtils;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  public class JCacheFilterTest
  {
      private static File docBase;
  
      @BeforeClass
      public static void createEmptyDir() {
          docBase = new File("target/missing/");
          docBase.mkdirs();
          docBase.deleteOnExit();
      }
  
      @Test
      public void testFilterNoOutput() throws Exception
      {
          Empty.COUNTER.set(0);
          final Tomcat tomcat = new Tomcat();
          tomcat.setHostname("localhost");
          tomcat.setPort(0);
          try {
              tomcat.getEngine();
              tomcat.start();
              final Context ctx = tomcat.addWebapp("/sample", docBase.getAbsolutePath());
              Tomcat.addServlet(ctx, "empty", Empty.class.getName());
              ctx.addServletMapping("/", "empty");
              addJcsFilter(ctx);
              StandardContext.class.cast(ctx).filterStart();
  
              final URL url = new URL("http://localhost:" + tomcat.getConnector().getLocalPort() + "/sample/");
  
              assertEquals("", IOUtils.toString(url.openStream()));
              assertEquals(1, Empty.COUNTER.get());
  
              assertEquals("", IOUtils.toString(url.openStream()));
              assertEquals(1, Empty.COUNTER.get());
          } finally {
              stop(tomcat);
          }
      }
  
      @Test
      public void testFilter() throws Exception
      {
          Hello.COUNTER.set(0);
          final Tomcat tomcat = new Tomcat();
          tomcat.setPort(0);
          try {
              tomcat.getEngine();
              tomcat.start();
              final Context ctx = tomcat.addContext("/sample", docBase.getAbsolutePath());
              Tomcat.addServlet(ctx, "hello", Hello.class.getName());
              ctx.addServletMapping("/", "hello");
              addJcsFilter(ctx);
              StandardContext.class.cast(ctx).filterStart();
  
              final URL url = new URL("http://localhost:" + tomcat.getConnector().getLocalPort() + "/sample/");
              assertEquals("hello", IOUtils.toString(url.openStream()));
             assertEquals(1, Hello.COUNTER.get());
 
             assertEquals("hello", IOUtils.toString(url.openStream()));
             assertEquals(1, Hello.COUNTER.get());
         } finally {
             stop(tomcat);
         }
     }
 
     private void stop(final Tomcat tomcat) throws LifecycleException {
         if (LifecycleState.STARTED.equals(tomcat.getServer().getState())) {
             tomcat.stop();
             tomcat.destroy();
         }
     }
 
     private void addJcsFilter(final Context ctx) {
         final FilterDef filterDef = new FilterDef();
         filterDef.setFilterName("jcs");
         filterDef.setFilterClass(JCacheFilter.class.getName());
         ctx.addFilterDef(filterDef);
 
         final FilterMap filterMap = new FilterMap();
         filterMap.setFilterName(filterDef.getFilterName());
         filterMap.addURLPattern("/*");
         ctx.addFilterMap(filterMap);
     }
 
     public static class Hello extends HttpServlet {
         public static final AtomicInteger COUNTER = new AtomicInteger();
 
         @Override
         protected void service(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
             resp.getWriter().write("hello");
             COUNTER.incrementAndGet();
         }
     }
 
     public static class Empty extends HttpServlet {
         public static final AtomicInteger COUNTER = new AtomicInteger();
 
         @Override
         protected void service(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
             resp.getWriter().write("");
             COUNTER.incrementAndGet();
         }
     }
 }