/*
    Action Scheduler

    This file is part of KMail, the KDE mail client.
    Copyright (c) Don Sanders <sanders@kde.org>

    KMail is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License, version 2, as
    published by the Free Software Foundation.

    KMail is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    In addition, as a special exception, the copyright holders give
    permission to link the code of this program with any edition of
    the TQt library by Trolltech AS, Norway (or with modified versions
    of TQt that use the same license as TQt), and distribute linked
    combinations including the two.  You must obey the GNU General
    Public License in all respects for all of the code used other than
    TQt.  If you modify this file, you may extend this exception to
    your version of the file, but you are not obligated to do so.  If
    you do not wish to do so, delete this exception statement from
    your version.
*/

#ifndef actionscheduler_h
#define actionscheduler_h

#include "kmfilteraction.h" // for KMFilterAction::ReturnCode
#include "kmfilter.h"
#include "kmfiltermgr.h" // KMFilterMgr::FilterSet
#include "kmcommands.h"

#include <tqobject.h>
#include <tqguardedptr.h>
#include <tqtimer.h>

class KMHeaders;

namespace KMail {

/* A class for asynchronous filtering of messages */
class ActionScheduler : public TQObject
{
  Q_OBJECT
  

public:
  enum ReturnCode { ResultOk, ResultError, ResultCriticalError };

  ActionScheduler(KMFilterMgr::FilterSet set,
		  TQValueList<KMFilter*> filters,
                  KMHeaders *headers = 0,
		  KMFolder *srcFolder = 0);
  ~ActionScheduler();

  /** The action scheduler will be deleted after the finish signal is emitted
      if this property is set to true */
  void setAutoDestruct( bool );

  /** Apply all filters even if they don't match */
  void setAlwaysMatch( bool );

  /** Set a default folder to move messages into */
  void setDefaultDestinationFolder( KMFolder* );

  /** Set a folder to monitor for new messages to filter */
  void setSourceFolder( KMFolder* );

  /** Set a list of filters to work with
   The current list will not be updated until the queue
   of messages left to process is empty */
  void setFilterList( TQValueList<KMFilter*> filters );

  /** Set the id of the account associated with this scheduler */
  void setAccountId( uint id  ) { mAccountId = id; mAccount = true; }

  /** Clear the id of the account associated with this scheduler */
  void clearAccountId() { mAccountId = 0; mAccount = false; }

  /** Queue a message for filtering */
  void execFilters(const TQValueList<TQ_UINT32> serNums);
  void execFilters(const TQPtrList<KMMsgBase> msgList);
  void execFilters(KMMsgBase* msgBase);
  void execFilters(TQ_UINT32 serNum);

  static TQString debug();
  static bool isEnabled();

  /** Allow or deny manipulations on the message to be filtered.
      This is needed when using pipe-through filters, because the
      changes made by the filter have to be written back.
      The old value before applying the new value is returned. */
  bool ignoreChanges( bool ignore );

signals:
  /** Emitted when filtering is completed */
  void result(ReturnCode);
  void filtered(TQ_UINT32);

public slots:
  /** Called back by asynchronous actions when they have completed */
  void actionMessage(KMFilterAction::ReturnCode = KMFilterAction::GoOn);

  /** Called back by asynchronous copy actions when they have completed */
  void copyMessageFinished( KMCommand *command );

private slots:
  KMMsgBase* messageBase(TQ_UINT32 serNum);
  KMMessage* message(TQ_UINT32 serNum);
  void finish();

  void folderClosedOrExpunged();

  int tempOpenFolder(KMFolder* aFolder);
  void tempCloseFolders();

  //Fetching slots
  void fetchMessage();
  void messageFetched( KMMessage *msg );
  void msgAdded( KMFolder*, TQ_UINT32 );
  void enqueue(TQ_UINT32 serNum);

  //Filtering slots
  void processMessage();
  void messageRetrieved(KMMessage*);
  void filterMessage();
  void moveMessage();
  void moveMessageFinished( KMCommand *command );
  void timeOut();
  void fetchTimeOut();

private:
  static TQValueList<ActionScheduler*> *schedulerList; // for debugging
  static KMFolderMgr *tempFolderMgr;
  static int refCount, count;
  static bool sEnabled, sEnabledChecked;
  TQValueListIterator<TQ_UINT32> mMessageIt;
  TQValueListIterator<KMFilter> mFilterIt;
  TQValueList<TQ_UINT32> mSerNums, mFetchSerNums;
  TQValueList<TQGuardedPtr<KMFolder> > mOpenFolders;
  TQValueList<KMFilter> mFilters, mQueuedFilters;
  KMFilterAction* mFilterAction;
  KMFilterMgr::FilterSet mSet;
  KMHeaders *mHeaders;
  TQGuardedPtr<KMFolder> mSrcFolder, mDestFolder;
  bool mExecuting, mExecutingLock, mFetchExecuting;
  bool mUnget, mFetchUnget;
  bool mIgnore;
  bool mFiltersAreQueued;
  bool mAutoDestruct;
  bool mAlwaysMatch;
  bool mAccount;
  uint mAccountId;
  TQ_UINT32 mOriginalSerNum;
  bool mDeleteSrcFolder;
  ReturnCode mResult;
  TQTimer *finishTimer, *fetchMessageTimer, *tempCloseFoldersTimer;
  TQTimer *processMessageTimer, *filterMessageTimer;
  TQTimer *timeOutTimer, *fetchTimeOutTimer;
  TQTime timeOutTime, fetchTimeOutTime;
  KMCommand *lastCommand;
  FolderJob *lastJob;
};

}

#endif /*actionscheduler_h*/
