/*
* Copyright (c) 2010 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: Utility class for fetching email.
*
*/

#ifndef _QEMAILFETCHER_H
#define _QEMAILFETCHER_H

#ifdef BUILD_DLL
#define DLL_EXPORT Q_DECL_EXPORT
#else
#define DLL_EXPORT Q_DECL_IMPORT
#endif

//TODO: Uncomment when available.
#include <nmapiemailservice.h>
#include <nmapieventnotifier.h>
#include <nmapimailboxlisting.h>
#include <nmapienvelopelisting.h>
#include <nmapimessageenvelope.h>
#include <nmapifolderlisting.h>
#include <QObject>
#include "memailitemobserver.h"

using namespace EmailClientApi;

//How this works:
//1. List all mail boxes.
//2. In each mail box, list the folders
//3. In each folder, list the mails
//4. Process each email
//
//We voluntarily relinquish the processor (we sleep) each time we have completed 
//processing a given folder. This is to avoid 'hogging' the processor.


class DLL_EXPORT QEmailFetcher: public QObject
    {
    Q_OBJECT
public:
    static QEmailFetcher* newInstance(MEmailItemObserver& aObserver);
    ~QEmailFetcher();
    void StartHarvesting();

private:
    QEmailFetcher(MEmailItemObserver& aObserver );
    static void initialize(QEmailFetcher* aThis); //helper (2nd phase constructor).

    //Private?
public slots:
    void emailServiceIntialized( bool );
    void handleMailboxesListed( int );
    void mailFoldersListed( int );
    void processMessages( int );
    //Connect to messageEvent signal
    void handleMessageEvent( MessageEvent aEvent, quint64 mailboxId, quint64 folderId, QList<quint64> messageList );
    
private:
    MEmailItemObserver& iEmailObserver;     //The parent/creator. Not owned.
    NmEventNotifier* iEmailEventNotifier;   //owned; triggers handleMessageEvent.
    NmEmailService* iEmailService;          //owned. 
    NmMailboxListing* iMailBoxListings;     //owned.
    NmFolderListing* iMailFolderList;       //owned.
    NmEnvelopeListing* iEnvelopeListing;    //owned.
    NmMessageEnvelope* iMessageListing;     //owned.
    };

#endif //_QEMAILFETCHER_H