/* -*- c++ -*-
 * Copyright (c) 2000, 2001 Alex Zepeda <zipzippy@sonic.net>
 * Copyright (c) 2001 Michael H�ckel <Michael@Haeckel.Net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#ifndef _SMTP_H
#define _SMTP_H

#include <kio/tcpslavebase.h>

#include "capabilities.h"

#include <tqstring.h>
#include <tqptrqueue.h>

class KURL;
class TQCString;
template <typename T> class TQMemArray;
#ifdef USE_QT3
typedef TQMemArray<char> TQByteArray;
#endif // USE_QT3

namespace KioSMTP {
  class Response;
  class TransactionState;
  class Command;
}

class SMTPProtocol : public KIO::TCPSlaveBase {
  friend class KioSMTP::Command;
public:
  SMTPProtocol(const TQCString & pool, const TQCString & app, bool useSSL);
  virtual ~ SMTPProtocol();

  virtual void setHost(const TQString & host, int port,
                       const TQString & user, const TQString & pass);

  virtual void special(const TQByteArray & aData);
  virtual void put(const KURL & url, int permissions, bool overwrite,
                   bool resume);
  virtual void stat(const KURL & url);
  virtual void openConnection();
  virtual void closeConnection();

protected:

  bool smtp_open(const TQString& fakeHostname = TQString::null);

  /** Closes the connection. If @p nice is true (default), then QUIT
      is sent and it's reponse waited for. */
  void smtp_close( bool nice=true );

  /** Execute command @p cmd */
  bool execute( KioSMTP::Command * cmd, KioSMTP::TransactionState * ts=0 );
  /** Execute a command of type @p type */
  bool execute( int type, KioSMTP::TransactionState * ts=0 );
  /** Execute the queued commands. If something goes horribly wrong
      (sending command oline fails, getting response fails or some
      command raises the failedFatally() flag in @p ts, shuts down the
      connection with <code>smtp_close( false )</code>. If The
      transaction fails gracefully (<code>ts->failed()</code> is
      true), issues a RSET command.

      @return true if transaction succeeded, false otherwise.
  **/
  bool executeQueuedCommands( KioSMTP::TransactionState * ts );

  /** Parse a single response from the server. Single- vs. multiline
      responses are correctly detected.

      @param ok if not 0, returns whether response parsing was
                successful. Don't confuse this with negative responses
                (e.g. 5xx), which you can check for using
                @ref Response::isNegative()
      @return the @ref Response object representing the server response.
  **/
  KioSMTP::Response getResponse( bool * ok );

  bool authenticate();
  void parseFeatures( const KioSMTP::Response & ehloResponse );

  bool sendCommandLine( const TQCString & cmd );
  TQCString collectPipelineCommands( KioSMTP::TransactionState * ts );
  bool batchProcessResponses( KioSMTP::TransactionState * ts );

  /** This is a pure convenience wrapper around
      @ref KioSMTP::Capabilities::have() */
  bool haveCapability( const char * cap ) const {
    return mCapabilities.have( cap );
  }

  /** @return true is pipelining is available and allowed by metadata */
  bool canPipelineCommands() const {
    return haveCapability("PIPELINING") && metaData("pipelining") != "off" ;
  }

  /** Wrapper around getsockopt(..., SO_SNDBUF,...) */
  unsigned int sendBufferSize() const;

  /** This is a pure convenience wrapper around
      @ref KioSMTP::Capabilities::createSpecialResponse */
  TQString createSpecialResponse() const {
    return mCapabilities.createSpecialResponse( usingTLS() || haveCapability( "STARTTLS" ) );
  }

  void queueCommand( KioSMTP::Command * command ) {
    mPendingCommandQueue.enqueue( command );
  }
  void queueCommand( int type );

  unsigned short m_iOldPort;
  bool m_opened;
  TQString m_sServer, m_sOldServer;
  TQString m_sUser, m_sOldUser;
  TQString m_sPass, m_sOldPass;
  TQString m_hostname;

  KioSMTP::Capabilities mCapabilities;

  typedef TQPtrQueue<KioSMTP::Command> CommandQueue;
  CommandQueue mPendingCommandQueue;
  CommandQueue mSentCommandQueue;
};

#endif // _SMTP_H