/*
 * This file is a part of Winix
 * and is distributed under the 2-Clause BSD licence.
 * Author: Tomasz Sowa <t.sowa@ttmath.org>
 */

/* 
 * Copyright (c) 2010-2014, Tomasz Sowa
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 */
 
#ifndef headerfile_winix_core_app
#define headerfile_winix_core_app

#include <iostream>
#include <ctime>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <fcgiapp.h>

#include "config.h"
#include "system.h"
#include "mounts.h"
#include "request.h"
#include "synchro.h"
#include "sessionmanager.h"
#include "db/db.h"
#include "functions/functions.h"
#include "templates/templates.h"
#include "compress.h"
#include "postparser.h"
#include "cookieparser.h"
#include "postmultiparser.h"
#include "acceptencodingparser.h"



namespace Winix
{




class App
{
public:

	App();

	bool InitFCGI();
	bool DropPrivileges();
	bool Init();
	void Start();
	void Close();
	void LogUserGroups();
	bool Demonize();
	void SetStopSignal();
	bool WasStopSignal();
	bool Lock();
	void Unlock();
	void StartThreads();
	void WaitForThreads();

	// configuration read from a config file
	Config config;

	// pointers to the current request and a session
	Cur cur;

	// temporary one request object
	// current request
	Request req;

	// users sessions
	SessionManager session_manager;

	// database
	Db db;
	DbConn db_conn;



	/*
		model
	*/

	// ...
	System system;

	// functions (ls, cat, emacs, ...)
	Functions functions;

	// false at the beginning
	// !! IMPROVE ME moze to do loggera dac?
	bool stdout_is_closed;


	/*
		view
	*/

	Templates templates;


private:

	enum Header
	{
		h_200,
		h_404,
		h_403
	};

	PostParser post_parser;
	PostMultiParser post_multi_parser;
	CookieParser cookie_parser;
	AcceptEncodingParser accept_encoding_parser;
	Compress compress;
	FCGX_Request fcgi_request;
	int fcgi_socket;
	Synchro synchro;
	pthread_t signal_thread;
	std::string socket_to_send_on_exit;
	std::string send_data_buf;
	PT::SpaceToJSON json_generic_serializer;
	TextStream<std::wstring> json_out_stream;
	std::string aheader_name, aheader_value;
	std::wstring html_filtered;
	std::string output_8bit;
	BinaryPage compressed_output;
	std::wstring cookie_id_string;

	bool InitFCGI(char * sock, char * sock_user, char * sock_group);
	bool InitFCGIChmodChownSocket(char * sock, char * sock_user, char * sock_group);
	bool DropPrivileges(char * user, char * group);
	bool DropPrivileges(const char * user, uid_t uid, gid_t gid, bool additional_groups);
	bool CheckAccessFromPlugins();
	void ProcessRequestThrow();
	void ProcessRequest();
	void BaseUrlRedirect(int code, bool add_subdomain);
	bool BaseUrlRedirect();
	void CheckIfNeedSSLredirect();
	void SetLocale();
	void CheckPostRedirect();
	void MakePage();
	void Make();
	void SaveSessionsIfNeeded(); // !! IMPROVE ME wywalic do menagera sesji??
	void LogAccess();
	void SendData(const BinaryPage & page, FCGX_Stream * out);
	void CreateJSONAnswer();

	void ReadRequest();
	void SendTextAnswer();
	void SendBinaryAnswer();
	void SendAnswer();

	void LogEnvironmentVariables();

	void SetEnv(const char * name, std::wstring & env);
	void ReadEnvVariables();
	void ReadEnvRemoteIP();
	void ReadPostVars();

	void CheckIE();
	void CheckKonqueror();
	void CheckRequestMethod();
	void CheckSSL();
	void SetSubdomain();


	Header GetHTTPStatusCode();
	void PrepareSessionCookie();
	void FilterContent();
	void SendHeaders();
	void SendCookies();
	bool AddHeader(const wchar_t * name, const wchar_t * value);
	bool AddHeader(const std::wstring & name, const std::wstring & value);
	bool AddHeader(const wchar_t * name, const PT::WTextStream & value);
	bool AddHeader(const std::wstring & name, const PT::WTextStream & value);
	bool PrepareHeadersStaticCreateResource(PT::WTextStream & out_path);
	void PrepareHeadersStatic();
	void PrepareHeaderContentType();
	void PrepareHeadersForbidden();
	void PrepareHeadersRedirect();
	void PrepareHeadersSendFile();
	void PrepareHeadersCompression(int compress_encoding);
	void PrepareHeadersNormal(Header header, size_t output_size);
	void PrepareHeaders(bool compressing, int compress_encoding, Header header, size_t output_size);
	int  SelectDeflateVersion();
	void SelectCompression(size_t source_len, bool & compression_allowed, int & compression_encoding);
	bool CanSendContent();
	void ClearAfterRequest();

	void LogUser(const char * msg, uid_t id);
	void LogGroup(const char * msg, gid_t id, bool put_logend = true);
	void LogUsers();
	void LogEffectiveGroups(std::vector<gid_t> & tab);
	void LogGroups();

	static void * SpecialThreadForSignals(void*);
	void SendEmptyFastCGIPacket();

	void CreateStaticTree();

	// !! IMPROVE ME
	// !! move to the session manager?
	time_t last_sessions_save;
};


} // namespace Winix


#endif