/*
 *	Copyright © 2012,2013 Naim A.
 *
 *	This file is part of UDPT.
 *
 *		UDPT 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 3 of the License, or
 *		(at your option) any later version.
 *
 *		UDPT 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 UDPT.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <iostream>

#include "logging.h"
#include "multiplatform.h"
#include "udpTracker.hpp"
#include "settings.hpp"
#include "http/httpserver.hpp"
#include "http/webapp.hpp"
#include <cstdlib>	// atoi
#include <csignal>	// signal
#include <cstring>	// strlen

using namespace std;
using namespace UDPT;
using namespace UDPT::Server;

Logger *logger;
static struct {
	Settings *settings;
	UDPTracker *usi;
	WebApp *wa;
	HTTPServer *httpserver;
} Instance;

static void _print_usage ()
{
	cout << "Usage: udpt [<configuration file>]" << endl;
}

static void _doAPIStart (Settings *settings, WebApp **wa, HTTPServer **srv, DatabaseDriver *drvr)
{
	if (settings == NULL)
		return;
	Settings::SettingClass *sc = settings->getClass("apiserver");
	if (sc == NULL)
		return;		// no settings set!

	if (!sc->getBool("enable", false))
	{
		cerr << "API Server not enabled." << endl;
		return;
	}

	try {
		*srv = Instance.httpserver = new HTTPServer (settings);
		*wa = Instance.wa = new WebApp (*srv, drvr, settings);
		(*wa)->deploy();
	} catch (ServerException &e)
	{
		cerr << "ServerException #" << e.getErrorCode() << ": " << e.getErrorMsg() << endl;
	}
}

/**
 * Sets current working directory to executables directory.
 */
static void _setCWD (char *argv0)
{
#ifdef WIN32
		wchar_t strFileName [MAX_PATH];
		DWORD r, i;
		r = GetModuleFileNameW(NULL, strFileName, MAX_PATH);
		for (i = r;i >= 0;i--)
		{
			if (strFileName[i] == '\\')
			{
				strFileName[i] = '\0';
				break;
			}
		}
		SetCurrentDirectoryW(strFileName);

#elif defined(linux)
		int len, i;
		char *strFN;
		if (argv0 != NULL)
		{
			len = strlen (argv0);
			strFN = new char [len + 1];

			for (i = len;i >= 0;i--)
			{
				if (strFN[i] == '/')
				{
					strFN = '\0';
					break;
				}
			}
			chdir (strFN);
			delete [] strFN;
		}
#endif

}

/**
 * Releases resources before exit.
 */
static void _doCleanup ()
{
	delete Instance.wa;
	delete Instance.httpserver;
	delete Instance.usi;
	delete Instance.settings;
	delete logger;

	memset (&Instance, 0, sizeof(Instance));
	logger = NULL;
}

static void _signal_handler (int sig)
{
	stringstream ss;
	ss << "Signal " << sig << " raised. Terminating...";
	logger->log(Logger::LL_INFO, ss.str());
	_doCleanup();
}

int main(int argc, char *argv[])
{
	Settings *settings;
	UDPTracker *usi;
	string config_file;
	int r;

#ifdef WIN32
	WSADATA wsadata;
	WSAStartup(MAKEWORD(2, 2), &wsadata);
#endif

	cout << "UDP Tracker (UDPT) " << VERSION << endl;
	cout << "Copyright 2012,2013 Naim Abda <naim94a@gmail.com>\n\tReleased under the GPLv3 License." << endl;
	cout << "Build Date: " << __DATE__ << endl << endl;

	config_file = "udpt.conf";
	memset(&Instance, 0, sizeof(Instance));

#ifdef SIGBREAK
	signal(SIGBREAK, &_signal_handler);
#endif
#ifdef SIGTERM
	signal(SIGTERM, &_signal_handler);
#endif
#ifdef SIGABRT
	signal(SIGABRT, &_signal_handler);
#endif
#ifdef SIGINT
	signal(SIGINT, &_signal_handler);
#endif

	if (argc <= 1)
	{
		// set current directory when no filename is present.
		_setCWD(argv[0]);

		_print_usage ();
	}
	else if (argc >= 2)
	{
		config_file = argv[1];	// reported in issue #5.
	}

	settings = Instance.settings = new Settings (config_file);

	if (!settings->load())
	{
		const char strDATABASE[] = "database";
		const char strTRACKER[] = "tracker";
		const char strAPISRV [] = "apiserver";
		// set default settings:

		settings->set (strDATABASE, "driver", "sqlite3");
		settings->set (strDATABASE, "file", "tracker.db");

		settings->set (strTRACKER, "is_dynamic", "0");
		settings->set (strTRACKER, "port", "6969");		// UDP PORT
		settings->set (strTRACKER, "threads", "5");
		settings->set (strTRACKER, "allow_remotes", "1");
		settings->set (strTRACKER, "allow_iana_ips", "1");
		settings->set (strTRACKER, "announce_interval", "1800");
		settings->set (strTRACKER, "cleanup_interval", "120");

		settings->set (strAPISRV, "enable", "1");
		settings->set (strAPISRV, "threads", "1");
		settings->set (strAPISRV, "port", "6969");	// TCP PORT

		settings->save();
		cerr << "Failed to read from '" << config_file.c_str() << "'. Using default settings." << endl;
	}

	logger = new Logger (settings);
	usi = Instance.usi = new UDPTracker (settings);

	HTTPServer *apiSrv = NULL;
	WebApp *wa = NULL;

	r = usi->start();
	if (r != UDPTracker::START_OK)
	{
		cerr << "Error While trying to start server." << endl;
		switch (r)
		{
		case UDPTracker::START_ESOCKET_FAILED:
			cerr << "Failed to create socket." << endl;
			break;
		case UDPTracker::START_EBIND_FAILED:
			cerr << "Failed to bind socket." << endl;
			break;
		default:
			cerr << "Unknown Error" << endl;
			break;
		}
		goto cleanup;
	}

	_doAPIStart(settings, &wa, &apiSrv, usi->conn);

	cout << "Hit Control-C to exit." << endl;

	usi->wait();

cleanup:
	cout << endl << "Goodbye." << endl;

#ifdef WIN32
	WSACleanup();
#endif

	return 0;
}