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/*
    Copyright (c) 2011 Grégory Oestreicher <greg@kamago.net>

    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., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#ifndef AKONADI_FREEBUSYPROVIDERBASE_H
#define AKONADI_FREEBUSYPROVIDERBASE_H

#include "akonadi-calendar_export.h"

#include <QtCore/QString>

class KDateTime;

namespace Akonadi
{

class FreeBusyProviderBasePrivate;

/**
 * @short Base class for resources providing free-busy information
 *
 * This class must be inherited by resources that are able to provide
 * free-busy information for a given contact on request. A resource
 * will thus inherit from ResourceBase and FreeBusyProvider.
 *
 * Resources that provide FB info must declare it by adding
 * 'FreeBusyProvider' in the X-Akonadi-Capabilities field of their
 * .desktop file:
 \code
 X-Akonadi-Capabilities=Resource,FreeBusyProvider
 \endcode
 *
 * Resource inheriting from this class must implement lastCacheUpdate(),
 * canHandleFreeBusy() and retrieveFreeBusy().
 *
 * @since 4.7
 */

class AKONADI_CALENDAR_EXPORT FreeBusyProviderBase
{
public:
    /**
      * Creates a new FreeBusyProvider
      */
    FreeBusyProviderBase();

    /**
      * Destroys a FreeBusyProvider
      */
    virtual ~FreeBusyProviderBase();

    /**
      * Returns the last time the free-busy information was
      * fetched from the server. This can be used for example
      * to issue a warning to the user that this information
      * may not be accurate and must be refreshed; pretty useful
      * when the resource was offline for too long.
      *
      * @return The date and time the cache was last updated.
      */
    virtual KDateTime lastCacheUpdate() const = 0;

    /**
      * This method is called to find out is the resource
      * handle free-busy information for the contact with
      * email address @p email.
      *
      * The caller will not wait for the result. Once the
      * decision is known, the resource must call
      * handlesFreeBusy().
      *
      * @param email The email address of the contact we want
      *              the free-busy info. This is a simple email
      *              address, in the form foo@bar.com (no display
      *              name or quoting).
      * @see handlesFreeBusy()
      *
      */
    virtual void canHandleFreeBusy(const QString &email) const = 0;

    /**
      * Derivate classes must call this method once they know
      * if they handle free-busy information for the contact
      * with email address @p email.
      *
      * @param email The email address of the contact we give the
      *              response for. This is a simple email
      *              address, in the form foo@bar.com (no display
      *              name or quoting).
      * @param handles Whether this resource handles free-busy (true)
      *              or not (false).
      */
    void handlesFreeBusy(const QString &email, bool handles) const;

    /**
      * This method is called when the resource must do the real
      * work and fetch the free-busy information for the contact
      * with email address @p email.
      *
      * As with canHandleFreeBusy() the caller will not wait for
      * the result and the resource must call freeBusyRetrieved()
      * once done.
      *
      * @param email The email address of the contact we want
      *              the free-busy info. This is a simple email
      *              address, in the form foo@bar.com (no display
      *              name or quoting).
      * @param start The start of the period the free-busy request covers
      * @param end The end of the free-busy period
      * @see freeBusyRetrieved()
      */
    virtual void retrieveFreeBusy(const QString &email, const KDateTime &start, const KDateTime &end) = 0;

    /**
      * Derivate classes must call this method to notify the requestor
      * that the result is here.
      *
      * The @p freeBusy is expected to be an iTIP request containing
      * the free-busy data. The simplest way to generate this is
      * to use KCalCore::ICalFormat::createScheduleMessage()
      * with the method KCalCore::iTIPRequest.
      *
      * @param email The email address of the contact we give the
      *              response for. This is a simple email
      *              address, in the form foo@bar.com (no display
      *              name or quoting).
      * @param freeBusy The free-busy data.
      * @param success Whether the retrieval was successful or not.
      * @param errorText An optional error message that can be displayed back
      *                  to the user.
      */
    void freeBusyRetrieved(const QString &email, const QString &freeBusy, bool success, const QString &errorText = QString());

private:
    //@cond PRIVATE
    FreeBusyProviderBasePrivate *const d;
    //@endcond
};

}

#endif // AKONADI_FREEBUSYPROVIDERBASE_H