/*
 * 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) 2008-2018, 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.
 * 
 */
 
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <fstream>
#include <sys/param.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include "core/app.h"
#include "core/version.h"
#include "utf8/utf8.h"




namespace Winix
{



/*
	application object
*/
App app;




void print_syntax()
{
	std::cout << "Syntax:" << std::endl;	
	std::cout << "  winix config_file" << std::endl;	
}



void CreateNewDescriptor(int des_dst, int flags)
{
int descriptor;

	descriptor = open("/dev/null", flags | O_NOCTTY);

	if( descriptor != -1 )
	{
		dup2(descriptor, des_dst);

		if( descriptor != des_dst )
			close(descriptor);
	}
}



void CloseDescriptors()
{
	close(0);
	close(1);
	close(2);
	app.stdout_is_closed = true;

	CreateNewDescriptor(0, O_RDONLY);
	CreateNewDescriptor(1, O_WRONLY);
	CreateNewDescriptor(2, O_WRONLY);
}


void LogInfo(Log & log, LogManipulators log_level, const char * msg, bool put_version, const char * msg2)
{
	log << log_level;
	log.PrintDate(pt::Date(std::time(0)));
	log << ' ' << msg;

	if( put_version )
	{
		log << ' ' << WINIX_VER_MAJOR
			<< '.' << WINIX_VER_MINOR
			<< '.' << WINIX_VER_REVISION;
	}

	log << ' ' << msg2 << logend;
}


void SavePidFile(Log & log)
{
	if( !app.config.pid_file.empty() )
	{
		std::string file_name;
		pt::wide_to_utf8(app.config.pid_file, file_name);
		std::ofstream file(file_name);

		if( !file )
		{
			log << log1 << "I cannot save the pid to a file: " << app.config.pid_file << logend;
		}
		else
		{
			file << getpid() << "\n";
			file.close();
			log << log3 << "Process pid saved to: " << app.config.pid_file << logend;
		}
	}
}


void RemovePidFile()
{
	if( !app.config.pid_file.empty() )
	{
		std::string file_name;
		pt::wide_to_utf8(app.config.pid_file, file_name);
		unlink(file_name.c_str());
	}
}



} // namespace Winix


int main(int argv, char ** argc)
{
using Winix::app;

	std::srand(std::time(0));

	if( argv != 2 )
	{
		Winix::print_syntax();
		return 1;
	}

	app.system.system_start = time(0);
	
	if( !pt::utf8_to_wide(argc[1], app.config.config_file) )
	{
		std::wcout << "An incorrect UTF-8 path of the config file" << std::endl;
		return 6;
	}

	if( !app.config.ReadConfig(true, false) ) /* errors to stdout, stdout in not closed */
		return 2;

	Winix::Log & log = app.GetMainLog();
	app.InitLoggers();

	if( app.stdout_is_closed || app.config.demonize )
		app.config.log_stdout = false;

	if( !app.config.log_stdout )
		Winix::CloseDescriptors();

	if( app.config.demonize && !app.Demonize() )
		return 4;

	Winix::LogInfo(log, Winix::log3, "booting Winix", true, "");

	if( !app.InitFCGI() )
		return 5;

	if( !app.DropPrivileges() )
		return 3;

	app.LogUserGroups();
	Winix::SavePidFile(log);

	// load plugins before loading sessions - session_manager.LoadSessions()
	// because some of the plugins can init its own sessions dates
	app.InitPlugins();

	// app.Init() starts other threads as well (they will be waiting on the lock)
	if( !app.Init() )
	{
		Winix::RemovePidFile();
		log << Winix::logsave;
		return 1;
	}

	app.StartThreads();
	// now we have more threads, we should use Lock() and Unlock()

	// saving all starting logs
	app.Lock();
	Winix::LogInfo(log, Winix::log1, "Winix", true, "started");
	log << Winix::logsave;
	app.Unlock();

	// main loop
	app.Start();

	app.Close();

	Winix::LogInfo(log, Winix::log1, "Winix", true, "stopped");
	Winix::RemovePidFile();
	log << Winix::logsave;

return 0;
}