/*
gameinfo.c - gameinfo.txt / liblist.gam parsing for filesystem
Copyright (C) 2003-2006 Mathieu Olivier
Copyright (C) 2000-2007 DarkPlaces contributors
Copyright (C) 2007 Uncle Mike
Copyright (C) 2015-2023 Xash3D FWGS contributors

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 3 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.
*/

#include "build.h"
#include <time.h>
#include <stdio.h>
#include "defaults.h"
#include "crtlib.h"
#include "filesystem.h"
#include "filesystem_internal.h"
#include "xash3d_mathlib.h"
#include "common/com_strings.h"
#include "common/protocol.h"
#include "library_suffix.h"

#define SAVE_AGED_COUNT 2 // the default count of quick and auto saves

/*
================
FS_WriteGameInfo

assume GameInfo is valid
================
*/
static qboolean FS_WriteGameInfo( const char *filepath, const gameinfo_t *GameInfo )
{
	file_t *f = FS_Open( filepath, "w", false ); // we in binary-mode
	int write_ambients = false;

	if( !f )
		return false;

	FS_Printf( f, "// generated by " XASH_ENGINE_NAME " " XASH_VERSION "-%s (%s-%s)\n\n\n", g_buildcommit, Q_buildos(), Q_buildarch() );

	if( !COM_StringEmpty( GameInfo->basedir ))
		FS_Printf( f, "basedir\t\t\"%s\"\n", GameInfo->basedir );

	// DEPRECATED: gamedir key isn't supported by FWGS fork
	// but write it anyway to keep compability with original Xash3D
	if( !COM_StringEmpty( GameInfo->gamefolder ))
		FS_Printf( f, "gamedir\t\t\"%s\"\n", GameInfo->gamefolder );

	if( !COM_StringEmpty( GameInfo->falldir ))
		FS_Printf( f, "fallback_dir\t\"%s\"\n", GameInfo->falldir );

	if( !COM_StringEmpty( GameInfo->title ))
		FS_Printf( f, "title\t\t\"%s\"\n", GameInfo->title );

	if( !COM_StringEmpty( GameInfo->startmap ))
		FS_Printf( f, "startmap\t\t\"%s\"\n", GameInfo->startmap );

	if( !COM_StringEmpty( GameInfo->trainmap ))
		FS_Printf( f, "trainmap\t\t\"%s\"\n", GameInfo->trainmap );

	if( GameInfo->version != 0.0f )
		FS_Printf( f, "version\t\t%g\n", GameInfo->version );

	if( GameInfo->size != 0 )
		FS_Printf( f, "size\t\t%zu\n", GameInfo->size );

	if( !COM_StringEmpty( GameInfo->game_url ))
		FS_Printf( f, "url_info\t\t\"%s\"\n", GameInfo->game_url );

	if( !COM_StringEmpty( GameInfo->update_url ))
		FS_Printf( f, "url_update\t\t\"%s\"\n", GameInfo->update_url );

	if( !COM_StringEmpty( GameInfo->type ))
		FS_Printf( f, "type\t\t\"%s\"\n", GameInfo->type );

	if( !COM_StringEmpty( GameInfo->date ))
		FS_Printf( f, "date\t\t\"%s\"\n", GameInfo->date );

	if( !COM_StringEmpty( GameInfo->dll_path ))
		FS_Printf( f, "dllpath\t\t\"%s\"\n", GameInfo->dll_path );

	if( !COM_StringEmpty( GameInfo->game_dll ))
		FS_Printf( f, "gamedll\t\t\"%s\"\n", GameInfo->game_dll );

	if( !COM_StringEmpty( GameInfo->game_dll_linux ))
		FS_Printf( f, "gamedll_linux\t\t\"%s\"\n", GameInfo->game_dll_linux );

	if( !COM_StringEmpty( GameInfo->game_dll_osx ))
		FS_Printf( f, "gamedll_osx\t\t\"%s\"\n", GameInfo->game_dll_osx );

	if( !COM_StringEmpty( GameInfo->iconpath ))
		FS_Printf( f, "icon\t\t\"%s\"\n", GameInfo->iconpath );

	switch( GameInfo->gamemode )
	{
	case 1: FS_Print( f, "gamemode\t\t\"singleplayer_only\"\n" ); break;
	case 2: FS_Print( f, "gamemode\t\t\"multiplayer_only\"\n" ); break;
	}

	if( !COM_StringEmpty( GameInfo->sp_entity ))
		FS_Printf( f, "sp_entity\t\t\"%s\"\n", GameInfo->sp_entity );
	if( !COM_StringEmpty( GameInfo->mp_entity ))
		FS_Printf( f, "mp_entity\t\t\"%s\"\n", GameInfo->mp_entity );
	if( !COM_StringEmpty( GameInfo->mp_filter ))
		FS_Printf( f, "mp_filter\t\t\"%s\"\n", GameInfo->mp_filter );

	if( GameInfo->secure )
		FS_Printf( f, "secure\t\t\"%i\"\n", GameInfo->secure );

	if( GameInfo->nomodels )
		FS_Printf( f, "nomodels\t\t\"%i\"\n", GameInfo->nomodels );

	if( GameInfo->max_edicts > 0 )
		FS_Printf( f, "max_edicts\t%i\n", GameInfo->max_edicts );
	if( GameInfo->max_tents > 0 )
		FS_Printf( f, "max_tempents\t%i\n", GameInfo->max_tents );
	if( GameInfo->max_beams > 0 )
		FS_Printf( f, "max_beams\t\t%i\n", GameInfo->max_beams );
	if( GameInfo->max_particles > 0 )
		FS_Printf( f, "max_particles\t%i\n", GameInfo->max_particles );

	for( int i = 0; i < NUM_AMBIENTS; i++ )
	{
		if( *GameInfo->ambientsound[i] )
		{
			if( !write_ambients )
			{
				FS_Print( f, "\n" );
				write_ambients = true;
			}
			FS_Printf( f, "ambient%i\t\t%s\n", i, GameInfo->ambientsound[i] );
		}
	}

	if( GameInfo->noskills )
		FS_Printf( f, "noskills\t\t\"%i\"\n", GameInfo->noskills );

	if( GameInfo->quicksave_aged_count != SAVE_AGED_COUNT )
		FS_Printf( f, "quicksave_aged_count\t\t%d\n", GameInfo->quicksave_aged_count );

	if( GameInfo->autosave_aged_count != SAVE_AGED_COUNT )
		FS_Printf( f, "autosave_aged_count\t\t%d\n", GameInfo->autosave_aged_count );

	// HL25 compatibility
	if( GameInfo->animated_title )
		FS_Printf( f, "animated_title\t\t%i\n", GameInfo->animated_title );

	if( GameInfo->hd_background )
		FS_Printf( f, "hd_background\t\t%i\n", GameInfo->hd_background );

	// always expose our extensions :)
	FS_Printf( f, "internal_vgui_support\t\t%i\n", GameInfo->internal_vgui_support );
	FS_Printf( f, "render_picbutton_text\t\t%i\n", GameInfo->render_picbutton_text );

	if( !COM_StringEmpty( GameInfo->demomap ))
		FS_Printf( f, "demomap\t\t\"%s\"\n", GameInfo->demomap );

	FS_Close( f );	// all done

	return true;
}

void FS_MakeGameInfo( void )
{
	if( FS_WriteGameInfo( "gameinfo.txt", FI.GameInfo ))
		Con_Printf( "Successfully generated %s/gameinfo.txt\n", FI.GameInfo->gamefolder );
	else
		Con_Printf( S_ERROR "Can't open %s/gameinfo.txt for write\n", FI.GameInfo->gamefolder );
}

static void FS_InitGameInfo( gameinfo_t *GameInfo, const char *gamedir, qboolean quake, time_t mtime )
{
	memset( GameInfo, 0, sizeof( *GameInfo ));

	// filesystem info
	GameInfo->mtime = mtime;
	Q_strncpy( GameInfo->gamefolder, gamedir, sizeof( GameInfo->gamefolder ));
	Q_strncpy( GameInfo->sp_entity, "info_player_start", sizeof( GameInfo->sp_entity ));
	Q_strncpy( GameInfo->mp_entity, "info_player_deathmatch", sizeof( GameInfo->mp_entity ));
	Q_strncpy( GameInfo->iconpath, "game.ico", sizeof( GameInfo->iconpath ));

	if( quake )
	{
		Q_strncpy( GameInfo->basedir, "id1", sizeof( GameInfo->basedir ));
		Q_strncpy( GameInfo->falldir, "qwrap", sizeof( GameInfo->falldir ));
		Q_strncpy( GameInfo->title, gamedir, sizeof( GameInfo->title ));
		Q_strncpy( GameInfo->startmap, "start", sizeof( GameInfo->startmap ));
		Q_strncpy( GameInfo->dll_path, "bin", sizeof( GameInfo->dll_path ));
		Q_strncpy( GameInfo->game_dll, "bin/progs.dll", sizeof( GameInfo->game_dll ));
		Q_strncpy( GameInfo->game_dll_linux, "bin/progs.so", sizeof( GameInfo->game_dll_linux ));
		Q_strncpy( GameInfo->game_dll_osx, "bin/progs.dylib", sizeof( GameInfo->game_dll_osx ));
	}
	else
	{
		Q_strncpy( GameInfo->basedir, fs_basedir, sizeof( GameInfo->basedir ));
		Q_strncpy( GameInfo->title, gamedir, sizeof( GameInfo->title ));
		Q_strncpy( GameInfo->startmap, "c0a0", sizeof( GameInfo->startmap ));
		Q_strncpy( GameInfo->dll_path, "cl_dlls", sizeof( GameInfo->dll_path ));
		Q_strncpy( GameInfo->game_dll, "dlls/hl.dll", sizeof( GameInfo->game_dll ));
		Q_strncpy( GameInfo->game_dll_linux, "dlls/hl.so", sizeof( GameInfo->game_dll_linux ));
		Q_strncpy( GameInfo->game_dll_osx, "dlls/hl.dylib", sizeof( GameInfo->game_dll_osx ));
	}

	GameInfo->max_edicts     = DEFAULT_MAX_EDICTS; // default value if not specified
	GameInfo->max_tents      = 500;
	GameInfo->max_beams      = 128;
	GameInfo->max_particles  = 4096;
	GameInfo->version        = 1.0f;

	GameInfo->quicksave_aged_count = SAVE_AGED_COUNT;
	GameInfo->autosave_aged_count  = SAVE_AGED_COUNT;
}

static void FS_ParseGenericGameInfo( gameinfo_t *GameInfo, const char *buf, const qboolean isGameInfo )
{
	char *pfile = (char*) buf;
	qboolean found_linux = false, found_osx = false;
	string token;

	while(( pfile = COM_ParseFile( pfile, token, sizeof( token ))) != NULL )
	{
		// different names in liblist/gameinfo
		if( !Q_stricmp( token, isGameInfo ? "title" : "game" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->title, sizeof( GameInfo->title ));
		}
		// valid for both
		else if( !Q_stricmp( token, "fallback_dir" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->falldir, sizeof( GameInfo->falldir ));
		}
		// valid for both
		else if( !Q_stricmp( token, "startmap" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->startmap, sizeof( GameInfo->startmap ));
			COM_StripExtension( GameInfo->startmap ); // HQ2:Amen has extension .bsp
		}
		// only trainmap is valid for gameinfo
		else if( !Q_stricmp( token, "trainmap" ) ||
			(!isGameInfo && !Q_stricmp( token, "trainingmap" )))
		{
			pfile = COM_ParseFile( pfile, GameInfo->trainmap, sizeof( GameInfo->trainmap ));
			COM_StripExtension( GameInfo->trainmap ); // HQ2:Amen has extension .bsp
		}
		// valid for both
		else if( !Q_stricmp( token, "url_info" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_url, sizeof( GameInfo->game_url ));
		}
		// different names
		else if( !Q_stricmp( token, isGameInfo ? "url_update" : "url_dl" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->update_url, sizeof( GameInfo->update_url ));
		}
		// valid for both
		else if( !Q_stricmp( token, "gamedll" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_dll, sizeof( GameInfo->game_dll ));
			COM_FixSlashes( GameInfo->game_dll );
		}
		// valid for both
		else if( !Q_stricmp( token, "gamedll_linux" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_dll_linux, sizeof( GameInfo->game_dll_linux ));
			found_linux = true;
		}
		// valid for both
		else if( !Q_stricmp( token, "gamedll_osx" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->game_dll_osx, sizeof( GameInfo->game_dll_osx ));
			found_osx = true;
		}
		// valid for both
		else if( !Q_stricmp( token, "icon" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->iconpath, sizeof( GameInfo->iconpath ));
			COM_FixSlashes( GameInfo->iconpath );
			COM_DefaultExtension( GameInfo->iconpath, ".ico", sizeof( GameInfo->iconpath ));
		}
		else if( !Q_stricmp( token, "type" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));

			if( isGameInfo )
			{
				Q_strncpy( GameInfo->type, token, sizeof( GameInfo->type ));
			}
			else
			{
				if( !Q_stricmp( token, "singleplayer_only" ))
				{
					// TODO: Remove this ugly hack too.
					// This was made because Half-Life has multiplayer,
					// but for some reason it's marked as singleplayer_only.
					// Old WON version is fine.
					if( !Q_stricmp( GameInfo->gamefolder, "valve") )
						GameInfo->gamemode = GAME_NORMAL;
					else
						GameInfo->gamemode = GAME_SINGLEPLAYER_ONLY;
					Q_strncpy( GameInfo->type, "Single", sizeof( GameInfo->type ));
				}
				else if( !Q_stricmp( token, "multiplayer_only" ))
				{
					GameInfo->gamemode = GAME_MULTIPLAYER_ONLY;
					Q_strncpy( GameInfo->type, "Multiplayer", sizeof( GameInfo->type ));
				}
				else
				{
					// pass type without changes
					if( !isGameInfo )
						GameInfo->gamemode = GAME_NORMAL;
					Q_strncpy( GameInfo->type, token, sizeof( GameInfo->type ));
				}
			}
		}
		// valid for both
		else if( !Q_stricmp( token, "version" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));
			GameInfo->version = Q_atof( token );
		}
		// valid for both
		else if( !Q_stricmp( token, "size" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));
			GameInfo->size = Q_atoi( token );
		}
		else if( !Q_stricmp( token, isGameInfo ? "mp_entity" : "mpentity" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->mp_entity, sizeof( GameInfo->mp_entity ));
		}
		else if( !Q_stricmp( token, isGameInfo ? "mp_filter" : "mpfilter" ))
		{
			pfile = COM_ParseFile( pfile, GameInfo->mp_filter, sizeof( GameInfo->mp_filter ));
		}
		// valid for both
		else if( !Q_stricmp( token, "secure" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));
			GameInfo->secure = Q_atoi( token ) ? true : false;
		}
		// valid for both
		else if( !Q_stricmp( token, "nomodels" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));
			GameInfo->nomodels = Q_atoi( token ) ? true : false;
		}
		else if( !Q_stricmp( token, isGameInfo ? "max_edicts" : "edicts" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));
			GameInfo->max_edicts = bound( MIN_EDICTS, Q_atoi( token ), MAX_EDICTS );
		}
		// valid for both
		else if( !Q_stricmp( token, "hd_background" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));
			GameInfo->hd_background = Q_atoi( token ) ? true : false;
		}
		else if( !Q_stricmp( token, "animated_title" ))
		{
			pfile = COM_ParseFile( pfile, token, sizeof( token ));
			GameInfo->animated_title = Q_atoi( token ) ? true : false;
		}
		// only for gameinfo
		else if( isGameInfo )
		{
			if( !Q_stricmp( token, "basedir" ))
			{
				string fs_path;
				pfile = COM_ParseFile( pfile, fs_path, sizeof( fs_path ));
				if( Q_stricmp( fs_path, GameInfo->basedir ) || Q_stricmp( fs_path, GameInfo->gamefolder ))
					Q_strncpy( GameInfo->basedir, fs_path, sizeof( GameInfo->basedir ));
			}
			else if( !Q_stricmp( token, "sp_entity" ))
			{
				pfile = COM_ParseFile( pfile, GameInfo->sp_entity, sizeof( GameInfo->sp_entity ));
			}
			else if( isGameInfo && !Q_stricmp( token, "dllpath" ))
			{
				pfile = COM_ParseFile( pfile, GameInfo->dll_path, sizeof( GameInfo->dll_path ));
			}
			else if( isGameInfo && !Q_stricmp( token, "date" ))
			{
				pfile = COM_ParseFile( pfile, GameInfo->date, sizeof( GameInfo->date ));
			}
			else if( !Q_stricmp( token, "max_tempents" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->max_tents = bound( 300, Q_atoi( token ), 2048 );
			}
			else if( !Q_stricmp( token, "max_beams" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->max_beams = bound( 64, Q_atoi( token ), 512 );
			}
			else if( !Q_stricmp( token, "max_particles" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->max_particles = bound( 1024, Q_atoi( token ), 131072 );
			}
			else if( !Q_stricmp( token, "gamemode" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				// TODO: Remove this ugly hack too.
				// This was made because Half-Life has multiplayer,
				// but for some reason it's marked as singleplayer_only.
				// Old WON version is fine.
				if( !Q_stricmp( token, "singleplayer_only" ) && Q_stricmp( GameInfo->gamefolder, "valve") )
					GameInfo->gamemode = GAME_SINGLEPLAYER_ONLY;
				else if( !Q_stricmp( token, "multiplayer_only" ))
					GameInfo->gamemode = GAME_MULTIPLAYER_ONLY;
			}
			else if( !Q_strnicmp( token, "ambient", 7 ))
			{
				int ambientNum = Q_atoi( token + 7 );

				if( ambientNum < 0 || ambientNum >= NUM_AMBIENTS )
					ambientNum = 0;
				pfile = COM_ParseFile( pfile, GameInfo->ambientsound[ambientNum],
					sizeof( GameInfo->ambientsound[ambientNum] ));
			}
			else if( !Q_stricmp( token, "noskills" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->noskills = Q_atoi( token ) ? true : false;
			}
			else if( !Q_stricmp( token, "render_picbutton_text" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->render_picbutton_text = Q_atoi( token ) ? true : false;
			}
			else if( !Q_stricmp( token, "internal_vgui_support" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->internal_vgui_support = Q_atoi( token ) ? true : false;
			}
			else if( !Q_stricmp( token, "quicksave_aged_count" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->quicksave_aged_count = bound( 2, Q_atoi( token ), 99 );
			}
			else if( !Q_stricmp( token, "autosave_aged_count" ))
			{
				pfile = COM_ParseFile( pfile, token, sizeof( token ));
				GameInfo->autosave_aged_count = bound( 2, Q_atoi( token ), 99 );
			}
			else if( !Q_stricmp( token, "demomap" ))
			{
				pfile = COM_ParseFile( pfile, GameInfo->demomap, sizeof( GameInfo->demomap ));
			}
		}
	}

	// demomap only valid for gameinfo.txt but HL1 after 25th anniversary update
	// comes with demo chapter. Set the demomap here.
	if( COM_StringEmpty( GameInfo->demomap ))
	{
		if( !Q_stricmp( GameInfo->title, "Half-Life" )) // original check from GameUI
			Q_strncpy( GameInfo->demomap, "hldemo1", sizeof( GameInfo->demomap ));
	}

	if( !found_linux || !found_osx )
	{
		// just replace extension from dll to so/dylib
		char gamedll[64];
		Q_strncpy( gamedll, GameInfo->game_dll, sizeof( gamedll ));
		COM_StripExtension( gamedll );

		if( !found_linux )
			Q_snprintf( GameInfo->game_dll_linux, sizeof( GameInfo->game_dll_linux ), "%s.so", gamedll );

		if( !found_osx )
			Q_snprintf( GameInfo->game_dll_osx, sizeof( GameInfo->game_dll_osx ), "%s.dylib", gamedll );
	}

	// make sure what gamedir is really exist
	// a1ba: why we are doing this???
	Q_snprintf( token, sizeof( token ), "%s/%s", fs_rootdir, GameInfo->falldir );
	if( !FS_SysFolderExists( token ))
	{
		if( !COM_StringEmpty( fs_rodir ))
		{
			Q_snprintf( token, sizeof( token ), "%s/%s", fs_rodir, GameInfo->falldir );
			if( !FS_SysFolderExists( token ))
				GameInfo->falldir[0] = 0;
		}
		else GameInfo->falldir[0] = 0;
	}
}

/*
================
FS_ParseLiblistGam
================
*/
static qboolean FS_ParseLiblistGam( const char *filename, const char *gamedir, gameinfo_t *GameInfo, time_t mtime )
{
	char *afile = FS_LoadDirectFile( filename, NULL );

	if( !afile )
		return false;

	FS_InitGameInfo( GameInfo, gamedir, false, mtime );
	FS_ParseGenericGameInfo( GameInfo, afile, false );

	Mem_Free( afile );

	return true;
}

/*
================
FS_ConvertGameInfo
================
*/
static qboolean FS_ConvertGameInfo( const char *gamedir, const char *gameinfo_path, const char *liblist_path, gameinfo_t *gi, time_t liblist_mtime )
{
	memset( gi, 0, sizeof( *gi ));

	// liblist.gam to gameinfo.txt conversion is deprecated, only support for RwDir!
	if( FS_ParseLiblistGam( liblist_path, gamedir, gi, liblist_mtime ))
	{
		Con_DPrintf( "Convert %s to %s\n", liblist_path, gameinfo_path );
		return FS_WriteGameInfo( gameinfo_path, gi );
	}

	return false;
}

/*
================
FS_ReadGameInfo
================
*/
static qboolean FS_ReadGameInfo( const char *filename, const char *gamedir, gameinfo_t *GameInfo, time_t mtime )
{
	char *afile = FS_LoadDirectFile( filename, NULL );

	if( !afile )
		return false;

	FS_InitGameInfo( GameInfo, gamedir, false, mtime );
	FS_ParseGenericGameInfo( GameInfo, afile, true );

	Mem_Free( afile );

	return true;
}

/*
================
FS_CheckForQuakeGameDir

Checks if game directory resembles Quake Engine game directory
(some of checks may as well work with Xash gamedirs, it's not a bug)
================
*/
static qboolean FS_CheckForQuakeGameDir( const char *gamedir )
{
	// if directory contain quake.rc or progs.dat it's 100% quake gamedir
	// quake mods probably always archived, so check pak0.pak too
	const char *files[] = { "pak0.pak", "PAK0.PAK", "progs.dat", "quake.rc" };

	// search it in the filesystem
	for( int i = 0; i < sizeof( files ) / sizeof( files[0] ); i++ )
	{
		char buf[MAX_SYSPATH];

		if( Q_snprintf( buf, sizeof( buf ), "%s/%s", gamedir, files[i] ) > 0 )
		{
			if( !FS_SysFileExists( buf ))
				continue;

			if( !Q_stricmp( COM_FileExtension( buf ), "pak" ))
			{
				if( FS_CheckForQuakePak( buf, &files[2], sizeof( files ) / sizeof( files[0] ) - 2 ))
					return true;
			}
			else
			{
				return true;
			}
		}
	}

	return false;
}

/*
===============
FS_CheckForXashGameDir

Checks if game directory resembles Xash3D game directory
===============
*/
static qboolean FS_CheckForXashGameDir( const char *gamedir )
{
	// if directory contain gameinfo.txt or liblist.gam it's 100% gamedir
	const char *files[] = { "gameinfo.txt", "liblist.gam" };

	for( int i = 0; i < sizeof( files ) / sizeof( files[0] ); i++ )
	{
		char buf[MAX_SYSPATH];

		if( Q_snprintf( buf, sizeof( buf ), "%s/%s", gamedir, files[i] ) > 0 )
		{
			if( FS_SysFileExists( buf ))
				return true;
		}
	}

	return false;
}

/*
================
FS_ParseGameInfo
================
*/
qboolean FS_ParseGameInfo( const char *gamedir, gameinfo_t *GameInfo, qboolean rodir )
{
	char liblist_path[MAX_SYSPATH];
	char gameinfo_path[MAX_SYSPATH];
	char gamedir_path[MAX_SYSPATH];
	time_t liblist_mtime;
	time_t gameinfo_mtime;

	if( rodir )
		Q_snprintf( gamedir_path, sizeof( gamedir_path ), "%s/%s", fs_rodir, gamedir );
	else
		Q_snprintf( gamedir_path, sizeof( gamedir_path ), "%s", gamedir );

	if( !FS_CheckForXashGameDir( gamedir_path ))
	{
		// check if we need to generate gameinfo for Quake
		if( FS_CheckForQuakeGameDir( gamedir_path ))
		{
			// just generate stub gameinfo in memory
			FS_InitGameInfo( GameInfo, gamedir, true, -1 );
			GameInfo->rodir = rodir;
			return true;
		}

		// don't add empty or addon directories
		return false;
	}

	Q_snprintf( gameinfo_path, sizeof( gameinfo_path ), "%s/gameinfo.txt", gamedir_path );
	Q_snprintf( liblist_path, sizeof( liblist_path ), "%s/liblist.gam", gamedir_path );

	liblist_mtime = FS_SysFileTime( liblist_path );
	gameinfo_mtime = FS_SysFileTime( gameinfo_path );

	// in this function we never write new files for RoDir compatibility
	// since RoDir is only FWGS feature, do gameinfo.txt conversion only
	// for RwDir for those who worked with original Xash3D
	if( !rodir )
	{
		// !!!only if we have both liblist.gam and gameinfo.txt try to convert liblist.gam to gameinfo.txt if it's newer!!!
		if( liblist_mtime >= 0 && gameinfo_mtime >= 0 && liblist_mtime > gameinfo_mtime )
		{
			if( FS_ConvertGameInfo( gamedir, gameinfo_path, liblist_path, GameInfo, liblist_mtime ))
				return true;
		}
	}

	// can we parse gameinfo.txt?
	if( gameinfo_mtime >= 0 )
	{
		if( FS_ReadGameInfo( gameinfo_path, gamedir, GameInfo, gameinfo_mtime ))
		{
			GameInfo->rodir = rodir;
			return true;
		}
	}

	// can we parse liblist.gam?
	if( liblist_mtime >= 0 )
	{
		if( FS_ParseLiblistGam( liblist_path, gamedir, GameInfo, liblist_mtime ))
		{
			GameInfo->rodir = rodir;
			return true;
		}
	}

	return false;
}