/*
    * 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.jcs3.jcache.extras.web;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.PrintWriter;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  import java.util.TreeMap;
  import java.util.concurrent.CopyOnWriteArraySet;
  import javax.servlet.ServletOutputStream;
  import javax.servlet.http.Cookie;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpServletResponseWrapper;
  
  public class InMemoryResponse extends HttpServletResponseWrapper implements Serializable
  {
      private final OutputStream buffer;
  
      private final Collection<Cookie> cookies = new CopyOnWriteArraySet<>();
      private final Map<String, List<Serializable>> headers = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
      private int status = SC_OK;
      private String contentType;
      private PrintWriter writer;
      private int contentLength;
  
      public InMemoryResponse(final HttpServletResponse response, final OutputStream baos)
      {
          super(response);
          this.buffer = baos;
      }
  
      private List<Serializable> ensureHeaderExists(final String s)
      {
          return headers.computeIfAbsent(s, k -> new LinkedList<>());
      }
  
      @Override
      public void addCookie(final Cookie cookie)
      {
          super.addCookie(cookie);
          cookies.add(cookie);
      }
  
      @Override
      public void addDateHeader(final String s, final long l)
      {
          super.addDateHeader(s, l);
          ensureHeaderExists(s).add(l);
      }
  
      @Override
      public void addHeader(final String s, final String s2)
      {
          super.addHeader(s, s2);
          ensureHeaderExists(s).add(s2);
      }
  
      @Override
      public void addIntHeader(final String s, final int i)
      {
          super.addIntHeader(s, i);
          ensureHeaderExists(s).add(i);
      }
  
      @Override
      public boolean containsHeader(final String s)
      {
          return headers.containsKey(s);
      }
  
      @Override
      public String getHeader(final String s)
      {
          final List<Serializable> serializables = headers.get(s);
          if (serializables.isEmpty())
          {
             return null;
         }
         return serializables.iterator().next().toString();
     }
 
     @Override
     public Collection<String> getHeaderNames()
     {
         return headers.keySet();
     }
 
     @Override
     public Collection<String> getHeaders(final String s)
     {
         final List<Serializable> serializables = headers.get(s);
         final Collection<String> strings = new ArrayList<>(serializables.size());
         for (final Serializable ser : serializables)
         {
             strings.add(ser.toString());
         }
         return strings;
     }
 
     @Override
     public int getStatus()
     {
         return status;
     }
 
     @Override
     public void sendError(final int i) throws IOException
     {
         status = i;
         super.sendError(i);
     }
 
     @Override
     public void sendError(final int i, final String s) throws IOException
     {
         status = i;
         super.sendError(i, s);
     }
 
     @Override
     public void sendRedirect(final String s) throws IOException
     {
         status = SC_MOVED_TEMPORARILY;
         super.sendRedirect(s);
     }
 
     @Override
     public void setDateHeader(final String s, final long l)
     {
         super.setDateHeader(s, l);
         final List<Serializable> serializables = ensureHeaderExists(s);
         serializables.clear();
         serializables.add(l);
     }
 
     @Override
     public void setHeader(final String s, final String s2)
     {
         super.setHeader(s, s2);
         final List<Serializable> serializables = ensureHeaderExists(s);
         serializables.clear();
         serializables.add(s2);
     }
 
     @Override
     public void setIntHeader(final String s, final int i)
     {
         super.setIntHeader(s, i);
         final List<Serializable> serializables = ensureHeaderExists(s);
         serializables.clear();
         serializables.add(i);
     }
 
     @Override
     public void setStatus(final int i)
     {
         status = i;
         super.setStatus(i);
     }
 
     @Override
     public void setStatus(final int i, final String s)
     {
         status = i;
         super.setStatus(i, s);
     }
 
     @Override
     public String getContentType()
     {
         return contentType;
     }
 
     @Override
     public ServletOutputStream getOutputStream() throws IOException
     {
         return new ServletOutputStream()
         {
             @Override
             public void write(final int b) throws IOException
             {
                 buffer.write(b);
             }
         };
     }
 
     @Override
     public PrintWriter getWriter() throws IOException
     {
         if (writer == null) {
             writer = new PrintWriter(new OutputStreamWriter(buffer, getCharacterEncoding()), true);
         }
         return writer;
     }
 
     @Override
     public void reset()
     {
         super.reset();
         status = SC_OK;
         headers.clear();
         cookies.clear();
         contentType = null;
         contentLength = 0;
     }
 
     @Override
     public void setContentLength(final int i)
     {
         super.setContentLength(i);
         contentLength = i;
     }
 
     @Override
     public void setContentType(final String s)
     {
         contentType = s;
         super.setContentType(s);
     }
 
     @Override
     public void flushBuffer() throws IOException
     {
         if (writer != null)
         {
             writer.flush();
         }
         else
         {
             buffer.flush();
         }
     }
 
     public int getContentLength()
     {
         return contentLength;
     }
 
     public Collection<Cookie> getCookies()
     {
         return cookies;
     }
 
     public Map<String, List<Serializable>> getHeaders()
     {
         return headers;
     }
 }