/**

   This file is part of CWRT package **

   Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). **

   This program is free software: you can redistribute it and/or modify

   it under the terms of the GNU (Lesser) General Public License as 

   published by the Free Software Foundation, version 2.1 of the License. 

   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 

   (Lesser) General Public License for more details. You should have 

   received a copy of the GNU (Lesser) General Public License along 

   with this program. If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef SEQUENTIALDOWNLOADMANAGER_H

#define SEQUENTIALDOWNLOADMANAGER_H

#include "dmcommon.h"

#include "dmpimpl.h"

#include "downloadevent.h"

#include <QObject>

#include <QQueue>

// forward declarations

class ClientDownload;

class QNetworkReply; 

class SequentialDownloadManagerPrivate;

// class declaration

class SequentialDownloadManager : public QObject

{

    DM_DECLARE_PRIVATE(SequentialDownloadManager); // private implementation

public:

    SequentialDownloadManager();

    virtual ~SequentialDownloadManager();

    // returns all the current downloads

    QList<Download *>& currentDownloads();

    // finds a download provided id if exists

    Download* findDownload(int dlId);

    // cancels all the downloads and removes from the list

    void removeAll();

    // cancels and removes the download from list

    void removeOne(Download *dl);

    // pauses all the downloads which are in progress

    void pauseAll();

    // resumes all the downloads which are paused

    void resumeAll();

    // Adds to the download list

    void addToSequentialDownload(Download* dl);

private:

    // removes adownload from created download list to download queue for downloading

    void addToDownloadQueue(Download* dl);

    // adds downloads to completed list of downloads

    void addToCompletedList(Download* dl);

    // processes a download when download start fired

    void process(int dlId);

    // event handler

    bool event(QEvent *event);

    // starts the next download in downloadQueue

    void startNext();

    // pauses the download if it is the first one in the queue

    void pauseDownload(int dlId);

    // resumes the download if it is the first one in the queue

    void resumeDownload(int dlId);

    // cancels the download if it is the first one in the queue

    void cancelDownload(int dlId);

    friend class ClientDownload;

};

#endif