//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.websocket.common;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.TreeMap;
  
  import org.eclipse.jetty.websocket.api.UpgradeRequest;
  import org.eclipse.jetty.websocket.api.UpgradeResponse;
  import org.eclipse.jetty.websocket.api.WebSocketConstants;
  import org.eclipse.jetty.websocket.api.extensions.ExtensionConfig;
  import org.eclipse.jetty.websocket.api.util.QuoteUtil;
  
  public class UpgradeResponseAdapter implements UpgradeResponse
  {
      public static final String SEC_WEBSOCKET_PROTOCOL = WebSocketConstants.SEC_WEBSOCKET_PROTOCOL;
      private int statusCode;
      private String statusReason;
      private Map<String, List<String>> headers = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
      private List<ExtensionConfig> extensions = new ArrayList<>();
      private boolean success = false;
  
      @Override
      public void addHeader(String name, String value)
      {
          String key = name;
          List<String> values = headers.get(key);
          if (values == null)
          {
              values = new ArrayList<>();
          }
          values.add(value);
          headers.put(key,values);
      }
  
      /**
       * Get the accepted WebSocket protocol.
       * 
       * @return the accepted WebSocket protocol.
       */
      @Override
      public String getAcceptedSubProtocol()
      {
          return getHeader(SEC_WEBSOCKET_PROTOCOL);
      }
  
      /**
       * Get the list of extensions that should be used for the websocket.
       * 
       * @return the list of negotiated extensions to use.
       */
      @Override
      public List<ExtensionConfig> getExtensions()
      {
          return extensions;
      }
  
      @Override
      public String getHeader(String name)
      {
          List<String> values = getHeaders(name);
          // no value list
          if (values == null)
          {
              return null;
          }
          int size = values.size();
          // empty value list
          if (size <= 0)
          {
              return null;
          }
          // simple return
          if (size == 1)
          {
              return values.get(0);
          }
          // join it with commas
          boolean needsDelim = false;
         StringBuilder ret = new StringBuilder();
         for (String value : values)
         {
             if (needsDelim)
             {
                 ret.append(", ");
             }
             QuoteUtil.quoteIfNeeded(ret,value,QuoteUtil.ABNF_REQUIRED_QUOTING);
             needsDelim = true;
         }
         return ret.toString();
     }
 
     @Override
     public Set<String> getHeaderNames()
     {
         return headers.keySet();
     }
 
     @Override
     public Map<String, List<String>> getHeaders()
     {
         return headers;
     }
 
     @Override
     public List<String> getHeaders(String name)
     {
         return headers.get(name);
     }
 
     @Override
     public int getStatusCode()
     {
         return statusCode;
     }
 
     @Override
     public String getStatusReason()
     {
         return statusReason;
     }
 
     @Override
     public boolean isSuccess()
     {
         return success;
     }
 
     /**
      * Issue a forbidden upgrade response.
      * <p>
      * This means that the websocket endpoint was valid, but the conditions to use a WebSocket resulted in a forbidden
      * access.
      * <p>
      * Use this when the origin or authentication is invalid.
      * 
      * @param message
      *            the short 1 line detail message about the forbidden response
      * @throws IOException
      *             if unable to send the forbidden
      */
     @Override
     public void sendForbidden(String message) throws IOException
     {
         throw new UnsupportedOperationException("Not supported");
     }
 
     /**
      * Set the accepted WebSocket Protocol.
      * 
      * @param protocol
      *            the protocol to list as accepted
      */
     @Override
     public void setAcceptedSubProtocol(String protocol)
     {
         setHeader(SEC_WEBSOCKET_PROTOCOL,protocol);
     }
 
     /**
      * Set the list of extensions that are approved for use with this websocket.
      * <p>
      * Notes:
      * <ul>
      * <li>Per the spec you cannot add extensions that have not been seen in the {@link UpgradeRequest}, just remove entries you don't want to use</li>
      * <li>If this is unused, or a null is passed, then the list negotiation will follow default behavior and use the complete list of extensions that are
      * available in this WebSocket server implementation.</li>
      * </ul>
      * 
      * @param extensions
      *            the list of extensions to use.
      */
     @Override
     public void setExtensions(List<ExtensionConfig> extensions)
     {
         this.extensions.clear();
         if (extensions != null)
         {
             this.extensions.addAll(extensions);
         }
     }
 
     @Override
     public void setHeader(String name, String value)
     {
         List<String> values = new ArrayList<>();
         values.add(value);
         headers.put(name,values);
     }
 
     @Override
     public void setStatusCode(int statusCode)
     {
         this.statusCode = statusCode;
     }
 
     @Override
     public void setStatusReason(String statusReason)
     {
         this.statusReason = statusReason;
     }
 
     @Override
     public void setSuccess(boolean success)
     {
         this.success = success;
     }
 }