/*
	grive: an GPL program to sync a local directory with Google Drive
	Copyright (C) 2012  Wan Wai Ho

	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 version 2
	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 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#pragma once

#include "Agent.hh"

#include <memory>
#include <string>

// dependent libraries
#include <curl/curl.h>

namespace gr {

class DataStream ;

namespace http {

/*!	\brief	agent to provide HTTP access
	
	This class provides functions to send HTTP request in many methods (e.g. get, post and put).
	Normally the HTTP response is returned in a Receivable.
*/
class CurlAgent : public Agent
{
public :
	CurlAgent() ;
	~CurlAgent() ;

	ResponseLog* GetLog() const ;
	void SetLog( ResponseLog *log ) ;
	void SetProgressBar( ProgressBar *progressbar ) ;

	long Request(
		const std::string&	method,
		const std::string&	url,
		SeekStream			*in,
		DataStream			*dest,
		const Header&		hdr,
		const long			downloadFileBytes = 0 ) ;

	std::string LastError() const ;
	std::string LastErrorHeaders() const ;
	
	std::string RedirLocation() const ;
	
	std::string Escape( const std::string& str ) ;
	std::string Unescape( const std::string& str ) ;

	static int progress_callback( void *ptr, curl_off_t TotalDownloadSize, curl_off_t finishedDownloadSize, curl_off_t TotalToUpload, curl_off_t NowUploaded );

private :
	static std::size_t HeaderCallback( void *ptr, size_t size, size_t nmemb, CurlAgent *pthis ) ;
	static std::size_t Receive( void* ptr, size_t size, size_t nmemb, CurlAgent *pthis ) ;

	long ExecCurl(
		const std::string&	url,
		DataStream			*dest,
		const Header&		hdr ) ;

	void Init() ;

private :
	struct Impl ;
	std::unique_ptr<Impl> m_pimpl ;
	std::unique_ptr<ResponseLog> m_log ;
	std::unique_ptr<ProgressBar> m_pb ;

	long totalDownloadSize;
	long downloadedBytes;
} ;

} } // end of namespace