/*

* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  This class contains the actual implementation of the engine.

 *

*/

#ifndef CAIAGENDAPLUGINENGINEIMPL_H

#define CAIAGENDAPLUGINENGINEIMPL_H

// INCLUDES

#include "CalEngineCallback.h"

#include "CalenEngine.h"

#include "PropertyObserver.h"

#include <calfilechangenotification.h>

// FORWARD DECLARATIONS

class CEnvironmentChangeNotifier;

class CEventExpirationTimer;

class CCalInstance;

class MPluginDataChangeObserver;

class CCalSession;

// CLASS DECLARATION

NONSHARABLE_CLASS( CAIAgendaPluginEngineImpl ) : public CBase,

                                                 public MCalenEngineListener,

                                                 public MPropertyChangeHandler,

                                                 public MCalFileChangeObserver

{

    // Allow CAIAgendaPluginEngine to access the SafeRefresh()

    friend class CAIAgendaPluginEngine;

 public:

    /**

     * Two-phased constructor.

     * @since Series 60 2.6

     * @param ?arg1 ?description

     **/

    static CAIAgendaPluginEngineImpl* NewL(MPluginDataChangeObserver& aDataChangeObserver, TObserverType aObserverType);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void ConstructL(void);

    /**

     * Destructor.

     * @since Series 60 2.6

     **/

    virtual ~CAIAgendaPluginEngineImpl(void);

 private:

    /**

     * Hide default constructor.

     * @since Series 60 2.6

     **/

    CAIAgendaPluginEngineImpl(MPluginDataChangeObserver& aDataChangeObserver, TObserverType aObserverType);

 public:  // From MCalenEngineListener

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void OpenDatabaseCompleted(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void GetEntriesCompleted(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void DoGetEntriesCompletedL(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void GetTodosCompleted(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void GetFutureEventCompleted(void);

    /**

     * ?member_description.

     * @since S60 3.1

     **/

    void GetCalendarDataCompleted(void);

    /**

     * ?member_description.

     * @since S60 3.0

     **/

    void HandleError(TInt aError);

public:  // From MPropertyChangeHandler

    /**

     * ?member_description.

     * @since Series 60 3.0

     **/

    void HandlePropertyChange(const TUid& /*aCategory*/, const TUint& /*aKey*/, const TInt& /*aValue*/);

 private: //from MCalFileChangeObserver

     /*

      * The callback that will recieve 1 or more file change notifications

      * @param aCalendarInfoChangeEntries Array of CCalFileChangeInfo

      */

    void CalendarInfoChangeNotificationL(RPointerArray<CCalFileChangeInfo>& aCalendarInfoChangeEntries);

 private:  // New functions

    /**

     * ?member_description.

     * @since S60 3.1

     **/

    void DoGetCalendarDataCompletedL(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void OpenDataBase(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void DoOpenDataBaseL(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void GetTodayData(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void DoGetTodayDataL(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void GetFutureData(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void DoGetFutureDataL(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     * @return ?description

     **/

    TBool HasEventsForTodayL(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void NotifyObserverAndCloseDB(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     * @param ?arg1 ?description

     * @return ?description

     **/

    static TInt EnvironmentChangeCallBack(TAny* aPtr);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void CloseCalendarEngine(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void RemoveExpiredEntries(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void DoRemoveExpiredEntriesL(void);

    /**

     * ?member_description.

     * @since Series 60 2.6

     **/

    void SetTimerForNextExpiringEventL(void);

    /** 

     * Find the difference (in minutes) between meeting in aIndex and next meeting (if exist) with different start time.

     * @since S60 3.1

     * @param aIndex  Index of the current meeting.

     * @param aDifference Reference to the result.

     **/

    void DiffToNextEventL(const TInt aIndex, TTimeIntervalMinutes& aDifference);

    /**

     * ?member_description.

     * @since Series 60 2.6

     * @param ?arg1 ?description

     **/

    void StateMachine(void);

 protected: // for CAIAgendaPluginEngine

    /**

     * ?member_description.

     * @since S60 3.0

     **/

    void SafeRefresh(void);

 private:  // From MEventExpirationObserver

    /**

     * Callback for iEventExpirationTimer.

     * @since Series 60 2.6

     **/

    static TInt EventExpiredCallBack(TAny* aPtr);

    /**

     * Callback for iRefreshTimer.

     * @since Series 60 3.0

     **/

    static TInt RefreshTimerCallBack(TAny* aPtr);

 private:  // Data members

    // Calendar agenda engine

    CCalenEngine* iCalendarEngine;

    // ?one_line_short_description_of_data

    RPointerArray<CCalInstance> iInstanceArray;

    // ?one_line_short_description_of_data

    MPluginDataChangeObserver& iDataChangeObserver;

    // ?one_line_short_description_of_data

    TObserverType iObserverType;

    // ?one_line_short_description_of_data

    CEnvironmentChangeNotifier* iEnvironmentChangeNotifier;

    // ?one_line_short_description_of_data

    enum TDBState

    {

        EDBOffline,

        EDBInitializing,

        EDBInitialized,

        EDBOpening,

        EDBOpen,

        EDBReading

    };

    // ?one_line_short_description_of_data

    enum TFetchState

    {

        EFetchNormal,

        EFetchFuture

    };

    // ?one_line_short_description_of_data

    TDBState iDBState;

    // ?one_line_short_description_of_data

    TFetchState iFetchState;

    // ?one_line_short_description_of_data

    TBool iNeedsUpdate;

    // ?one_line_short_description_of_data

    TBool iHadEvents;

    // Timer for event expirations

    CEventExpirationTimer* iExpirationTimer;

    // timer for SafeRefresh

    CEventExpirationTimer* iRefreshTimer;

    // ?one_line_short_description_of_data

    CPropertyObserver* iEventChangeObserver;

    // ?one_line_short_description_of_data

    CPropertyObserver* iTodoChangeObserver;

    // Counter for SafeRefresh calls

    TUint iRefreshCounter;

    // Calendar session for receving notification

    CCalSession* iCalendarSession;

};

#endif  // CAIAGENDAPLUGINENGINEIMPL_H

// End of File