/*
    This file is part of libkcal.

    Copyright (c) 2001-2003 Cornelius Schumacher <schumacher@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
*/
#ifndef KCAL_SCHEDULER_H
#define KCAL_SCHEDULER_H

#include <qstring.h>
#include <qptrlist.h>

namespace KCal {

class IncidenceBase;
class Event;
class Calendar;
class ICalFormat;
class FreeBusyCache;

/**
  This class provides an encapsulation of a scheduling message. It associates an
  incidence with a method and status information. This class is used by the
  Scheduler class.

  @short A Scheduling message
*/
class ScheduleMessage
{
  public:
    /**
      Message status.
    */
    enum Status { PublishNew, PublishUpdate, Obsolete, RequestNew,
                  RequestUpdate, Unknown };
  
    /**
      Create a scheduling message with method as defined in Scheduler::Method
      and a status.
    */
    ScheduleMessage( IncidenceBase *, int method, Status status );
    ~ScheduleMessage() {};
    
    /**
      Return event associated with this message.
    */
    IncidenceBase *event() { return mIncidence; }
    /**
      Return iTIP method associated with this message.
    */
    int method() { return mMethod; }
    /**
      Return status of this message.
    */
    Status status() { return mStatus; }
    /**
      Return error message if there is any.
    */
    QString error() { return mError; }

    /**
      Return a human-readable name for an iTIP message status.
    */
    static QString statusName( Status status );

  private:
    IncidenceBase *mIncidence;
    int mMethod;
    Status mStatus;
    QString mError;

    class Private;
    Private *d;
};

/**
  This class provides an encapsulation of iTIP transactions. It is an abstract
  base class for inheritance by implementations of the iTIP scheme like iMIP or
  iRIP.
*/
class Scheduler
{
  public:
    /**
      iTIP methods.
    */
    enum Method { Publish,Request,Refresh,Cancel,Add,Reply,Counter,
                  Declinecounter,NoMethod };
  
    /**
      Create scheduler for calendar specified as argument.
    */
    Scheduler( Calendar *calendar );
    virtual ~Scheduler();
    
    /**
      iTIP publish action
    */
    virtual bool publish( IncidenceBase *incidence,
                          const QString &recipients ) = 0;
    /**
      Perform iTIP transaction on incidence. The method is specified as the
      method argument and can be any valid iTIP method.
    */
    virtual bool performTransaction( IncidenceBase *incidence,
                                     Method method ) = 0;
    /**
      Perform iTIP transaction on incidence to specified recipient(s). The 
      method is specified as the method argumanet and can be any valid iTIP 
      method.
    */
    virtual bool performTransaction( IncidenceBase *incidence, Method method,
                                     const QString &recipients ) = 0;
    /**
      Retrieve incoming iTIP transactions.
    */
    virtual QPtrList<ScheduleMessage> retrieveTransactions() = 0;

    /**
      Accept transaction. The incidence argument specifies the iCal compoennt
      on which the transaction acts. The status is the result of processing a
      iTIP message with the current calendar and specifies the action to be
      taken for this incidence. The attendee is the email address of the person
      on who's behalf this transaction is to be performed.
    */
    bool acceptTransaction( IncidenceBase *, Method method,
                            ScheduleMessage::Status status,
                            const QString& attendee = QString::null );

    /**
      Return a machine-readable name for a iTIP method.
    */
    static QString methodName( Method );
    /**
      Return a translated human-readable name for a iTIP method.
    */
    static QString translatedMethodName( Method );

    virtual bool deleteTransaction( IncidenceBase *incidence );
    
    /**
      Returns the directory where the free-busy information is stored.
    */
    virtual QString freeBusyDir() = 0;

    /**
      Set free/busy cache used to store free/busy information.
    */
    void setFreeBusyCache( FreeBusyCache * );
    /**
      Return free/busy cache.
    */
    FreeBusyCache *freeBusyCache() const;

  protected:
    bool acceptPublish( IncidenceBase *, ScheduleMessage::Status status,
                        Method method );
    bool acceptRequest( IncidenceBase *, ScheduleMessage::Status status,
                        const QString & attendee );
    bool acceptAdd( IncidenceBase *, ScheduleMessage::Status status );
    bool acceptCancel( IncidenceBase *, ScheduleMessage::Status status );
    bool acceptDeclineCounter( IncidenceBase *,
                               ScheduleMessage::Status status );
    bool acceptReply( IncidenceBase *, ScheduleMessage::Status status,
                      Method method );
    bool acceptRefresh( IncidenceBase *, ScheduleMessage::Status status );
    bool acceptCounter( IncidenceBase *, ScheduleMessage::Status status );
    bool acceptFreeBusy( IncidenceBase *, Method method );

    Calendar *mCalendar;
    ICalFormat *mFormat;

  private:
    class Private;
    Private *d;
};

}

#endif
