/*  -*- mode: C++; c-file-style: "gnu" -*-

  Copyright (c) 2004 Ingo Kloecker <kloecker@kde.org>

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

  This program 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 Qt library by Trolltech AS, Norway (or with modified versions
  of Qt that use the same license as Qt), 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
  Qt.  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 MAILCOMMON_RULEWIDGETHANDLERMANAGER_H
#define MAILCOMMON_RULEWIDGETHANDLERMANAGER_H

#include "searchpattern.h"

#include <QByteArray>
#include <QVector>

class QObject;
class QByteArray;
class QString;
class QStackedWidget;

namespace MailCommon {

class RuleWidgetHandler;

/**
 * @short Singleton to manage the list of RuleWidgetHandlers
 */
class RuleWidgetHandlerManager
{
  static RuleWidgetHandlerManager * self;

  RuleWidgetHandlerManager();

  public:
    ~RuleWidgetHandlerManager();

    static RuleWidgetHandlerManager *instance()
    {
      if ( !self ) {
        self = new RuleWidgetHandlerManager();
      }
      return self;
    }

    void registerHandler( const RuleWidgetHandler *handler );
    void unregisterHandler( const RuleWidgetHandler *handler );

    void createWidgets( QStackedWidget *functionStack,
                        QStackedWidget *valueStack,
                        const QObject *receiver ) const;

    MailCommon::SearchRule::Function function( const QByteArray & field,
                                     const QStackedWidget *functionStack ) const;

    QString value( const QByteArray &field,
                   const QStackedWidget *functionStack,
                   const QStackedWidget *valueStack ) const;

    QString prettyValue( const QByteArray & field,
                         const QStackedWidget *functionStack,
                         const QStackedWidget *valueStack ) const;

    bool handlesField( const QByteArray & field,
                       const QStackedWidget *functionStack,
                       const QStackedWidget *valueStack ) const;

    void reset( QStackedWidget *functionStack,
                QStackedWidget *valueStack ) const;

    void setRule( QStackedWidget *functionStack,
                  QStackedWidget *valueStack,
                  const MailCommon::SearchRule::Ptr rule ) const;

    void update( const QByteArray & field,
                 QStackedWidget *functionStack,
                 QStackedWidget *valueStack ) const;

  private:
    typedef QVector<const RuleWidgetHandler*>::const_iterator const_iterator;
    typedef QVector<const RuleWidgetHandler*>::iterator iterator;

    QVector<const RuleWidgetHandler*> mHandlers;
};

} // namespace MailCommon

#endif
