//
   //  ========================================================================
   //  Copyright (c) 1995-2014 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.client.io;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.SocketAddress;
  import java.net.URI;
  import java.nio.channels.SocketChannel;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Locale;
  import java.util.Queue;
  import java.util.concurrent.ConcurrentLinkedQueue;
  
  import org.eclipse.jetty.util.component.ContainerLifeCycle;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  import org.eclipse.jetty.websocket.api.StatusCode;
  import org.eclipse.jetty.websocket.api.WebSocketException;
  import org.eclipse.jetty.websocket.client.ClientUpgradeRequest;
  import org.eclipse.jetty.websocket.client.WebSocketClient;
  import org.eclipse.jetty.websocket.common.WebSocketSession;
  import org.eclipse.jetty.websocket.common.events.EventDriver;
  
  /**
   * Internal Connection/Client Manager used to track active clients, their physical vs virtual connection information, and provide some means to create new
   * physical or virtual connections.
   */
  public class ConnectionManager extends ContainerLifeCycle
  {
      private class PhysicalConnect extends ConnectPromise
      {
          private SocketAddress bindAddress;
  
          public PhysicalConnect(WebSocketClient client, EventDriver driver, ClientUpgradeRequest request)
          {
              super(client,driver,request);
              this.bindAddress = client.getBindAddress();
          }
  
          @Override
          public void run()
          {
              SocketChannel channel = null;
              try
              {
                  channel = SocketChannel.open();
                  if (bindAddress != null)
                  {
                      channel.bind(bindAddress);
                  }
  
                  URI wsUri = getRequest().getRequestURI();
  
                  channel.socket().setTcpNoDelay(true); // disable nagle
                  channel.configureBlocking(false); // async always
  
                  InetSocketAddress address = toSocketAddress(wsUri);
  
                  if (channel.connect(address))
                  {
                      getSelector().accept(channel, this);
                  }
                  else
                  {
                      getSelector().connect(channel, this);
                  }
              }
              catch (Throwable t)
              {
                  // close the socket channel
                  if (channel != null)
                  {
                      try
                      {
                          channel.close();
                      }
                      catch (IOException ignore)
                      {
                          LOG.ignore(ignore);
                      }
                  }
                 
                 // notify the future
                 failed(t);
             }
         }
     }
 
     private class VirtualConnect extends ConnectPromise
     {
         public VirtualConnect(WebSocketClient client, EventDriver driver, ClientUpgradeRequest request)
         {
             super(client,driver,request);
         }
 
         @Override
         public void run()
         {
             failed(new WebSocketException("MUX Not yet supported"));
         }
     }
 
     private static final Logger LOG = Log.getLogger(ConnectionManager.class);
 
     public static InetSocketAddress toSocketAddress(URI uri)
     {
         if (!uri.isAbsolute())
         {
             throw new IllegalArgumentException("Cannot get InetSocketAddress of non-absolute URIs");
         }
 
         int port = uri.getPort();
         String scheme = uri.getScheme().toLowerCase(Locale.ENGLISH);
         if ("ws".equals(scheme))
         {
             if (port == (-1))
             {
                 port = 80;
             }
         }
         else if ("wss".equals(scheme))
         {
             if (port == (-1))
             {
                 port = 443;
             }
         }
         else
         {
             throw new IllegalArgumentException("Only support ws:// and wss:// URIs");
         }
 
         return new InetSocketAddress(uri.getHost(),port);
     }
 
     private final Queue<WebSocketSession> sessions = new ConcurrentLinkedQueue<>();
     private final WebSocketClient client;
     private WebSocketClientSelectorManager selector;
 
     public ConnectionManager(WebSocketClient client)
     {
         this.client = client;
     }
 
     public void addSession(WebSocketSession session)
     {
         sessions.add(session);
     }
 
     private void shutdownAllConnections()
     {
         for (WebSocketSession session : sessions)
         {
             if (session.getConnection() != null)
             {
                 try
                 {
                     session.getConnection().close(
                             StatusCode.SHUTDOWN,
                             "Shutdown");
                 }
                 catch (Throwable t)
                 {
                     LOG.debug("During Shutdown All Connections",t);
                 }
             }
         }
     }
 
     public ConnectPromise connect(WebSocketClient client, EventDriver driver, ClientUpgradeRequest request)
     {
         URI toUri = request.getRequestURI();
         String hostname = toUri.getHost();
 
         if (isVirtualConnectionPossibleTo(hostname))
         {
             return new VirtualConnect(client,driver,request);
         }
 
         return new PhysicalConnect(client,driver,request);
     }
 
     @Override
     protected void doStart() throws Exception
     {
         selector = newWebSocketClientSelectorManager(client);
         selector.setSslContextFactory(client.getSslContextFactory());
         selector.setConnectTimeout(client.getConnectTimeout());
         addBean(selector);
 
         super.doStart();
     }
 
     @Override
     protected void doStop() throws Exception
     {
         shutdownAllConnections();
         sessions.clear();
         super.doStop();
         removeBean(selector);
     }
 
     public WebSocketClientSelectorManager getSelector()
     {
         return selector;
     }
 
     public Collection<WebSocketSession> getSessions()
     {
         return Collections.unmodifiableCollection(sessions);
     }
 
     public boolean isVirtualConnectionPossibleTo(String hostname)
     {
         // TODO Auto-generated method stub
         return false;
     }
 
     /**
      * Factory method for new WebSocketClientSelectorManager (used by other projects like cometd)
      * 
      * @param client
      *            the client used to create the WebSocketClientSelectorManager
      * @return the new WebSocketClientSelectorManager
      */
     protected WebSocketClientSelectorManager newWebSocketClientSelectorManager(WebSocketClient client)
     {
         return new WebSocketClientSelectorManager(client);
     }
 
     public void removeSession(WebSocketSession session)
     {
         sessions.remove(session);
     }
 }