/home/niklas/workspace/fbgui/src/downloadmanager.h

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/*
 * Copyright (c) 2010,2011 - RZ Uni Freiburg
 * Copyright (c) 2010,2011 - OpenSLX Project
 *
 * This program/file is free software distributed under the GPL version 2.
 * See http://openslx.org/COPYING
 *
 * If you have any feedback please consult http://openslx.org/feedback and
 * send your feedback to feedback@openslx.org
 *
 * General information about OpenSLX can be found under http://openslx.org
 *
 *
 *         Class managing download requests:
 *              - provides queueing functionality
 *              - static info: filename, filesize
 *              - dynamic info: download progress, current speed
 *
 */

#ifndef DOWNLOADMANAGER_H
#define DOWNLOADMANAGER_H

#include "fbgui.h"

extern bool debug;
extern QUrl baseURL;
extern QString binPath;
extern QString downloadPath;
extern int updateInterval;

class DownloadManager: public QObject {
Q_OBJECT

public:
   DownloadManager();
   ~DownloadManager();
   QTime time;

private:
   // checks for valid download directory, ran once in constructor
   void checkDownloadDirectory();
   // private control function for queueing mechanism.
   void processDownloadRequest(const QUrl& url);

   // base objects for downloading
   QNetworkAccessManager* _qnam;
   QQueue<QUrl> _downloadQueue;
   QNetworkReply* _currentDownload;
   QFile _outfile;
   QDir _downloadDir;
   // download progress variables
   int _currentProgress, _lastProgress;
   // download in progress flag
   bool _dip;
   // static counter
   static int _downloaded;

signals:
   // notify sends a message to the javascript interface to be evaluated there
   void notify(const QString& msg);
   // downloadInfo sends static information (name, size) to the interface.
   void downloadInfo(const QString& filename, const double& filesize);
   // updateProgress sends download progress information to the interface.
   void updateProgress(const int& percent, const double& speed, const QString& unit);
   // signal emitted when download queue is empty.
   void downloadQueueEmpty();

public slots:
   // public slots to receive download requests.
   void downloadFile(const QUrl& fileUrl);
   // convenience function
   void downloadFile(const QString& fileUrl);

private slots:
   // private slots to manage the downloading process
   void startNextDownload();
   void processMetaInfo();
   void downloadReady();
   void downloadProgress(qint64 bytesIn, qint64 bytesTotal);
   void downloadFinished();
};

#endif // DOWNLOADMANAGER_H