// Copyright © 2010-2012 b0ris
//.
// 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.


#ifndef DOWNLOAD_CLIENT_H
#define DOWNLOAD_CLIENT_H

#include <string>
#include <vector>
#include <QObject>
#include "SslClient.h"

using std::map;
using std::pair;
using std::string;
using std::vector;

class QFile;

class DownloadClient: public SslClient 
{
Q_OBJECT
	
public:
	/**
	 * @brief	Initialize new DownloadClient instance
	 */
	DownloadClient();
	
	/**
	 * @brief 	Initialize new DownloadClient instance
	 * @param	addr	server address or hostname to connect to
	 */
	DownloadClient(QString addr);
	
	/**
	 * @brief	Download file from server
	 * @param	file	file path on client machine
	 */
	void Download(const string &file);
	
	/**
	 * @brief	Download file from server
	 * @param	file	pair of file name and it's md5 hash value
	 */
	void Download(const pair<string, string> &file);
	
	/**
	 * @brief	Download list of files
	 * @param	files	associative array of file names and it's md5 hashes
	 * @note	this is designated method among all of three
	 */
	void Download(const vector<pair<string, string> > &files);

signals:
	/**
	 * @brief	This signal is emitted when all files have been downloaded
	 */
	void downloadFinished();

private slots:
    void FileDataRecieved(SslClient::RequestType &type, QByteArray &confdata);

private:
    /**
     * @brief   maximum number of retries when downloading files
     */
    static const int MAX_DOWNLOAD_ATTEMPTS = 3;

	/**
	 * @brief	indicates that program is downloading file(s) right now
	 */
	bool isDownloading;
	
	/**
	 * @brief	name of file that is being downloaded
	 */
	QFile *current;
	
	/**
	 * @brief	index of file that is being downloaded
	 */
	int currentId;
	
    /**
     * @brief   number of failed download attempt per single file
     */
    map<string, int> status;

	/**
	 * @brief	List of file to
	 */
	vector<pair<string, string> > files;
	
	/**
	 * @brief	start file-by-file downloading process
	 */
	void DoDownload();
};

#endif