//
   //  ========================================================================
   //  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;
  
  import java.io.IOException;
  import java.net.CookieStore;
  import java.net.SocketAddress;
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Locale;
  import java.util.Set;
  import java.util.concurrent.Executor;
  import java.util.concurrent.Future;
  
  import org.eclipse.jetty.io.ByteBufferPool;
  import org.eclipse.jetty.io.MappedByteBufferPool;
  import org.eclipse.jetty.io.SelectorManager;
  import org.eclipse.jetty.util.HttpCookieStore;
  import org.eclipse.jetty.util.StringUtil;
  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.util.ssl.SslContextFactory;
  import org.eclipse.jetty.util.thread.QueuedThreadPool;
  import org.eclipse.jetty.util.thread.ScheduledExecutorScheduler;
  import org.eclipse.jetty.util.thread.Scheduler;
  import org.eclipse.jetty.util.thread.ShutdownThread;
  import org.eclipse.jetty.websocket.api.Session;
  import org.eclipse.jetty.websocket.api.WebSocketPolicy;
  import org.eclipse.jetty.websocket.api.extensions.Extension;
  import org.eclipse.jetty.websocket.api.extensions.ExtensionConfig;
  import org.eclipse.jetty.websocket.api.extensions.ExtensionFactory;
  import org.eclipse.jetty.websocket.client.io.ConnectPromise;
  import org.eclipse.jetty.websocket.client.io.ConnectionManager;
  import org.eclipse.jetty.websocket.client.io.UpgradeListener;
  import org.eclipse.jetty.websocket.client.masks.Masker;
  import org.eclipse.jetty.websocket.client.masks.RandomMasker;
  import org.eclipse.jetty.websocket.common.SessionFactory;
  import org.eclipse.jetty.websocket.common.SessionListener;
  import org.eclipse.jetty.websocket.common.WebSocketSession;
  import org.eclipse.jetty.websocket.common.WebSocketSessionFactory;
  import org.eclipse.jetty.websocket.common.events.EventDriver;
  import org.eclipse.jetty.websocket.common.events.EventDriverFactory;
  import org.eclipse.jetty.websocket.common.extensions.WebSocketExtensionFactory;
  
  /**
   * WebSocketClient provides a means of establishing connections to remote websocket endpoints.
   */
  public class WebSocketClient extends ContainerLifeCycle implements SessionListener
  {
      private static final Logger LOG = Log.getLogger(WebSocketClient.class);
  
      private final WebSocketPolicy policy;
      private final SslContextFactory sslContextFactory;
      private final WebSocketExtensionFactory extensionRegistry;
      private boolean daemon = false;
      private EventDriverFactory eventDriverFactory;
      private SessionFactory sessionFactory;
      private ByteBufferPool bufferPool;
      private Executor executor;
      private Scheduler scheduler;
      private CookieStore cookieStore;
      private ConnectionManager connectionManager;
      private Masker masker;
      private SocketAddress bindAddress;
      private long connectTimeout = SelectorManager.DEFAULT_CONNECT_TIMEOUT;
  
      public WebSocketClient()
      {
          this(null,null);
      }
  
      public WebSocketClient(Executor executor)
      {
          this(null,executor);
      }
      
      public WebSocketClient(ByteBufferPool bufferPool)
      {
          this(null,null,bufferPool);
      }
 
     public WebSocketClient(SslContextFactory sslContextFactory)
     {
         this(sslContextFactory,null);
     }
 
     public WebSocketClient(SslContextFactory sslContextFactory, Executor executor)
     {
         this(sslContextFactory,executor,new MappedByteBufferPool());
     }
     
     public WebSocketClient(SslContextFactory sslContextFactory, Executor executor, ByteBufferPool bufferPool)
     {
         this.executor = executor;
         this.sslContextFactory = sslContextFactory;
         this.policy = WebSocketPolicy.newClientPolicy();
         this.bufferPool = bufferPool;
         this.extensionRegistry = new WebSocketExtensionFactory(policy,bufferPool);
         
         // Bug #431459 - unregistering compression extensions till they are more stable
         this.extensionRegistry.unregister("deflate-frame");
         this.extensionRegistry.unregister("permessage-deflate");
         this.extensionRegistry.unregister("x-webkit-deflate-frame");
         
         this.masker = new RandomMasker();
         this.eventDriverFactory = new EventDriverFactory(policy);
         this.sessionFactory = new WebSocketSessionFactory(this);
         
         addBean(this.executor);
         addBean(this.sslContextFactory);
         addBean(this.bufferPool);
     }
 
     public Future<Session> connect(Object websocket, URI toUri) throws IOException
     {
         ClientUpgradeRequest request = new ClientUpgradeRequest(toUri);
         request.setRequestURI(toUri);
         request.setCookiesFrom(this.cookieStore);
 
         return connect(websocket,toUri,request);
     }
 
     public Future<Session> connect(Object websocket, URI toUri, ClientUpgradeRequest request) throws IOException
     {
         return connect(websocket,toUri,request,null);
     }
 
     public Future<Session> connect(Object websocket, URI toUri, ClientUpgradeRequest request, UpgradeListener upgradeListener) throws IOException
     {
         if (!isStarted())
         {
             throw new IllegalStateException(WebSocketClient.class.getSimpleName() + "@" + this.hashCode() + " is not started");
         }
 
         // Validate websocket URI
         if (!toUri.isAbsolute())
         {
             throw new IllegalArgumentException("WebSocket URI must be absolute");
         }
 
         if (StringUtil.isBlank(toUri.getScheme()))
         {
             throw new IllegalArgumentException("WebSocket URI must include a scheme");
         }
 
         String scheme = toUri.getScheme().toLowerCase(Locale.ENGLISH);
         if (("ws".equals(scheme) == false) && ("wss".equals(scheme) == false))
         {
             throw new IllegalArgumentException("WebSocket URI scheme only supports [ws] and [wss], not [" + scheme + "]");
         }
 
         request.setRequestURI(toUri);
         request.setCookiesFrom(this.cookieStore);
 
         // Validate Requested Extensions
         for (ExtensionConfig reqExt : request.getExtensions())
         {
             if (!extensionRegistry.isAvailable(reqExt.getName()))
             {
                 throw new IllegalArgumentException("Requested extension [" + reqExt.getName() + "] is not installed");
             }
         }
 
         // Validate websocket URI
         LOG.debug("connect websocket {} to {}",websocket,toUri);
 
         // Grab Connection Manager
         initialiseClient();
         ConnectionManager manager = getConnectionManager();
 
         // Setup Driver for user provided websocket
         EventDriver driver = null;
         if (websocket instanceof EventDriver)
         {
             // Use the EventDriver as-is
             driver = (EventDriver)websocket;
         }
         else
         {
             // Wrap websocket with appropriate EventDriver
             driver = eventDriverFactory.wrap(websocket);
         }
 
         if (driver == null)
         {
             throw new IllegalStateException("Unable to identify as websocket object: " + websocket.getClass().getName());
         }
 
         // Create the appropriate (physical vs virtual) connection task
         ConnectPromise promise = manager.connect(this,driver,request);
 
         if (upgradeListener != null)
         {
             promise.setUpgradeListener(upgradeListener);
         }
 
         LOG.debug("Connect Promise: {}",promise);
 
         // Execute the connection on the executor thread
         executor.execute(promise);
 
         // Return the future
         return promise;
     }
 
     @Override
     protected void doStart() throws Exception
     {
         LOG.debug("Starting {}",this);
 
         if (sslContextFactory != null)
         {
             addBean(sslContextFactory);
         }
 
         String name = WebSocketClient.class.getSimpleName() + "@" + hashCode();
 
         if (bufferPool == null)
         {
             bufferPool = new MappedByteBufferPool();
         }
         addBean(bufferPool);
 
         if (scheduler == null)
         {
             scheduler = new ScheduledExecutorScheduler(name + "-scheduler",daemon);
         }
         addBean(scheduler);
 
         if (cookieStore == null)
         {
             cookieStore = new HttpCookieStore.Empty();
         }
 
         super.doStart();
 
         LOG.debug("Started {}",this);
     }
 
     @Override
     protected void doStop() throws Exception
     {
         LOG.debug("Stopping {}",this);
 
         if (cookieStore != null)
         {
             cookieStore.removeAll();
             cookieStore = null;
         }
 
         super.doStop();
         LOG.debug("Stopped {}",this);
     }
 
     /**
      * Return the number of milliseconds for a timeout of an attempted write operation.
      * 
      * @return number of milliseconds for timeout of an attempted write operation
      */
     public long getAsyncWriteTimeout()
     {
         return this.policy.getAsyncWriteTimeout();
     }
 
     public SocketAddress getBindAddress()
     {
         return bindAddress;
     }
 
     public ByteBufferPool getBufferPool()
     {
         return bufferPool;
     }
 
     public ConnectionManager getConnectionManager()
     {
         return connectionManager;
     }
 
     public long getConnectTimeout()
     {
         return connectTimeout;
     }
 
     public CookieStore getCookieStore()
     {
         return cookieStore;
     }
     
     public EventDriverFactory getEventDriverFactory()
     {
         return eventDriverFactory;
     }
 
     public Executor getExecutor()
     {
         return executor;
     }
 
     public ExtensionFactory getExtensionFactory()
     {
         return extensionRegistry;
     }
 
     public Masker getMasker()
     {
         return masker;
     }
 
     /**
      * Get the maximum size for buffering of a binary message.
      * 
      * @return the maximum size of a binary message buffer.
      */
     public int getMaxBinaryMessageBufferSize()
     {
         return this.policy.getMaxBinaryMessageBufferSize();
     }
 
     /**
      * Get the maximum size for a binary message.
      * 
      * @return the maximum size of a binary message.
      */
     public long getMaxBinaryMessageSize()
     {
         return this.policy.getMaxBinaryMessageSize();
     }
 
     /**
      * Get the max idle timeout for new connections.
      * 
      * @return the max idle timeout in milliseconds for new connections.
      */
     public long getMaxIdleTimeout()
     {
         return this.policy.getIdleTimeout();
     }
 
     /**
      * Get the maximum size for buffering of a text message.
      * 
      * @return the maximum size of a text message buffer.
      */
     public int getMaxTextMessageBufferSize()
     {
         return this.policy.getMaxTextMessageBufferSize();
     }
 
     /**
      * Get the maximum size for a text message.
      * 
      * @return the maximum size of a text message.
      */
     public long getMaxTextMessageSize()
     {
         return this.policy.getMaxTextMessageSize();
     }
 
     public Set<WebSocketSession> getOpenSessions()
     {
         return new HashSet<>(getBeans(WebSocketSession.class));
     }
 
     public WebSocketPolicy getPolicy()
     {
         return this.policy;
     }
 
     public Scheduler getScheduler()
     {
         return scheduler;
     }
 
     public SessionFactory getSessionFactory()
     {
         return sessionFactory;
     }
 
     /**
      * @return the {@link SslContextFactory} that manages TLS encryption
      * @see #WebSocketClient(SslContextFactory)
      */
     public SslContextFactory getSslContextFactory()
     {
         return sslContextFactory;
     }
 
     public List<Extension> initExtensions(List<ExtensionConfig> requested)
     {
         List<Extension> extensions = new ArrayList<Extension>();
 
         for (ExtensionConfig cfg : requested)
         {
             Extension extension = extensionRegistry.newInstance(cfg);
 
             if (extension == null)
             {
                 continue;
             }
 
             LOG.debug("added {}",extension);
             extensions.add(extension);
         }
         LOG.debug("extensions={}",extensions);
         return extensions;
     }
 
     private synchronized void initialiseClient() throws IOException
     {
         ShutdownThread.register(this);
 
         if (executor == null)
         {
             QueuedThreadPool threadPool = new QueuedThreadPool();
             String name = WebSocketClient.class.getSimpleName() + "@" + hashCode();
             threadPool.setName(name);
             threadPool.setDaemon(daemon);
             executor = threadPool;
             addBean(executor,true);
         }
         else
         {
             addBean(executor,false);
         }
 
         if (connectionManager != null)
         {
             return;
         }
         try
         {
             connectionManager = newConnectionManager();
             addBean(connectionManager);
             connectionManager.start();
         }
         catch (IOException e)
         {
             throw e;
         }
         catch (Exception e)
         {
             throw new IOException(e);
         }
     }
 
     /**
      * Factory method for new ConnectionManager (used by other projects like cometd)
      * 
      * @return the ConnectionManager instance to use
      */
     protected ConnectionManager newConnectionManager()
     {
         return new ConnectionManager(this);
     }
 
     @Override
     public void onSessionClosed(WebSocketSession session)
     {
         LOG.debug("Session Closed: {}",session);
         removeBean(session);
     }
 
     @Override
     public void onSessionOpened(WebSocketSession session)
     {
         LOG.debug("Session Opened: {}",session);
     }
 
     public void setAsyncWriteTimeout(long ms)
     {
         this.policy.setAsyncWriteTimeout(ms);
     }
 
     public void setBindAdddress(SocketAddress bindAddress)
     {
         this.bindAddress = bindAddress;
     }
 
     public void setBufferPool(ByteBufferPool bufferPool)
     {
         this.bufferPool = bufferPool;
     }
 
     /**
      * Set the timeout for connecting to the remote server.
      * 
      * @param ms
      *            the timeout in milliseconds
      */
     public void setConnectTimeout(long ms)
     {
         if (ms < 0)
         {
             throw new IllegalStateException("Connect Timeout cannot be negative");
         }
         this.connectTimeout = ms;
     }
 
     public void setCookieStore(CookieStore cookieStore)
     {
         this.cookieStore = cookieStore;
     }
     
     public void setDaemon(boolean daemon)
     {
         this.daemon = daemon;
     }
 
     public void setEventDriverFactory(EventDriverFactory factory)
     {
         this.eventDriverFactory = factory;
     }
 
     public void setExecutor(Executor executor)
     {
         updateBean(this.executor,executor);
         this.executor = executor;
     }
 
     public void setMasker(Masker masker)
     {
         this.masker = masker;
     }
 
     public void setMaxBinaryMessageBufferSize(int max)
     {
         this.policy.setMaxBinaryMessageBufferSize(max);
     }
     
     /**
      * Set the max idle timeout for new connections.
      * <p>
      * Existing connections will not have their max idle timeout adjusted.
      * 
      * @param ms
      *            the timeout in milliseconds
      */
     public void setMaxIdleTimeout(long ms)
     {
         this.policy.setIdleTimeout(ms);
     }
 
     public void setMaxTextMessageBufferSize(int max)
     {
         this.policy.setMaxTextMessageBufferSize(max);
     }
 
     public void setSessionFactory(SessionFactory sessionFactory)
     {
         this.sessionFactory = sessionFactory;
     }
 
     @Override
     public void dump(Appendable out, String indent) throws IOException
     {
         dumpThis(out);
         dump(out, indent, getOpenSessions());
     }
 }