// 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 UPDATED_CONFIG_H
#define UPDATED_CONFIG_H

#include <QObject>
#include "Config.h"
#include "SslClient.h"

class QTimer;


/**
 * @brief	singleton class that can update it's configuration<br/>
 * 			-#	ServerEntry is read from servers list
 * 			-#	Trying to connect every Config::ServerEntry::retryTimeout
 * 			-#	When total time for all retries exceeds Config::ServerEntry::timeout go to the next ServerEntry
 */
class UpdatedConfig: public QObject, public Config
{
	Q_OBJECT

public:
	/**
	 * @brief	Retrieve application-wide instance of Config class
	 * @return	Pointer to singleton instance of Config class
	 */
	static UpdatedConfig *CurrentConfig();
	
	/**
	 * @brief	Get valid server address to communicate with
	 * @return	address of server to communicate with ot empty string
	 */
	string GetServerAddr();

signals:
	/**
	 * @brief	Signal is emitted when client configuration is updated
	 */
	void updated();

private slots:
	void update();
	void connectionError();
	void gotServerReply(SslClient::RequestType &type, QByteArray &confdata);

private:
	static const int UPDATED_STATE_FULL = 0x7E;
	
	/**
	 * @brief	Pointer to the singleton Config instance 
	 */
	static UpdatedConfig *self;
	
	/**
	 * @brief	SslClient instance that connects to server and retrieves config
	 */
	SslClient *client;
	
	/**
	 * @brief	timer that is responsible on config updates and reconnection retries
	 */
	QTimer *configUpdateTimer;
	
	/**
	 * @brief	bool value that is true if config is actual and was updated recently<br/>
	 * 			and false if it isn't actual and has to be updated
	 */
	bool configValid;

	/**
	 * @brief	Count time between subsequent request retries
	 */
	unsigned time;
	
	/**
	 * @brief	index of Config::servers that is currently being tried to connect or being worked with
	 */
	unsigned activeSrvIndex;
	
	/**
	 * @brief	value indicating whether last connetion attempt failed or not
	 */
	bool retryFailed;
	
	/**
	 * @brief	value indicating which config parts are already updated<br/>
	 * 			to check if some part is updated just apply & to this<br/>
	 *			value and any of SslClient::RequestType values
	 */
	unsigned char updateStatus;
	
	/**
	 * @brief	creates an instance and tries to connect to servers from config.cfg<br/>
	 *			one by one until working server is found or no other ServerEntry records left
	 */
	UpdatedConfig();
};

#endif