/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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 2 of the License,
or (at your option) any later version.

Quake III Arena source code 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <pwd.h>

#include "../qcommon/q_shared.h"
#include "../qcommon/qcommon.h"


// Used to determine where to store user-specific files
static char homePath[MAX_OSPATH];


int Sys_Milliseconds()
{
	static int sys_timeBase = 0;

	struct timeval tv;
	gettimeofday( &tv, NULL );

	if (!sys_timeBase) {
		sys_timeBase = tv.tv_sec;
		return tv.tv_usec/1000;
	}

	return ((tv.tv_sec - sys_timeBase)*1000 + tv.tv_usec/1000);
}


void Sys_Mkdir( const char* path )
{
	mkdir( path, 0777 );
}


#define	MAX_FOUND_FILES	0x1000

// bk001129 - new in 1.26
static void Sys_ListFilteredFiles( const char *basedir, const char *subdirs, const char *filter, char **list, int *numfiles ) {
	char		search[MAX_OSPATH], newsubdirs[MAX_OSPATH];
	char		filename[MAX_OSPATH];
	DIR			*fdir;
	struct dirent *d;
	struct stat st;

	if ( *numfiles >= MAX_FOUND_FILES - 1 ) {
		return;
	}

	if (strlen(subdirs)) {
		Com_sprintf( search, sizeof(search), "%s/%s", basedir, subdirs );
	}
	else {
		Com_sprintf( search, sizeof(search), "%s", basedir );
	}

	if ((fdir = opendir(search)) == NULL) {
		return;
	}

	while ((d = readdir(fdir)) != NULL) {
		Com_sprintf(filename, sizeof(filename), "%s/%s", search, d->d_name);
		if (stat(filename, &st) == -1)
			continue;

		if (st.st_mode & S_IFDIR) {
			if (Q_stricmp(d->d_name, ".") && Q_stricmp(d->d_name, "..")) {
				if (strlen(subdirs)) {
					Com_sprintf( newsubdirs, sizeof(newsubdirs), "%s/%s", subdirs, d->d_name);
				}
				else {
					Com_sprintf( newsubdirs, sizeof(newsubdirs), "%s", d->d_name);
				}
				Sys_ListFilteredFiles( basedir, newsubdirs, filter, list, numfiles );
			}
		}
		if ( *numfiles >= MAX_FOUND_FILES - 1 ) {
			break;
		}
		Com_sprintf( filename, sizeof(filename), "%s/%s", subdirs, d->d_name );
		if (!Com_FilterPath( filter, filename ))
			continue;
		list[ *numfiles ] = CopyString( filename );
		(*numfiles)++;
	}

	closedir(fdir);
}

char **Sys_ListFiles( const char *directory, const char *extension, const char *filter, int *numfiles, qboolean wantsubs )
{
	struct dirent *d;
	DIR		*fdir;
	qboolean dironly = wantsubs;
	char		search[MAX_OSPATH];
	int			nfiles;
	char		**listCopy;
	char		*list[MAX_FOUND_FILES];
	int			i;
	struct stat st;

	int			extLen;

	if (filter) {

		nfiles = 0;
		Sys_ListFilteredFiles( directory, "", filter, list, &nfiles );

		list[ nfiles ] = NULL;
		*numfiles = nfiles;

		if (!nfiles)
			return NULL;

		listCopy = (char**)Z_Malloc( ( nfiles + 1 ) * sizeof( *listCopy ) );
		for ( i = 0 ; i < nfiles ; i++ ) {
			listCopy[i] = list[i];
		}
		listCopy[i] = NULL;

		return listCopy;
	}

	if ( !extension)
		extension = "";

	if ( extension[0] == '/' && extension[1] == 0 ) {
		extension = "";
		dironly = qtrue;
	}

	extLen = strlen( extension );

	// search
	nfiles = 0;

	if ((fdir = opendir(directory)) == NULL) {
		*numfiles = 0;
		return NULL;
	}

	while ((d = readdir(fdir)) != NULL) {
		Com_sprintf(search, sizeof(search), "%s/%s", directory, d->d_name);
		if (stat(search, &st) == -1)
			continue;
		if ((dironly && !(st.st_mode & S_IFDIR)) ||
			(!dironly && (st.st_mode & S_IFDIR)))
			continue;

		if (*extension) {
			if ( strlen( d->d_name ) < strlen( extension ) ||
				Q_stricmp(
					d->d_name + strlen( d->d_name ) - strlen( extension ),
					extension ) ) {
				continue; // didn't match
			}
		}

		if ( nfiles == MAX_FOUND_FILES - 1 )
			break;
		list[ nfiles ] = CopyString( d->d_name );
		nfiles++;
	}

	list[ nfiles ] = NULL;

	closedir(fdir);

	// return a copy of the list
	*numfiles = nfiles;

	if ( !nfiles ) {
		return NULL;
	}

	listCopy = (char**)Z_Malloc( ( nfiles + 1 ) * sizeof( *listCopy ) );
	for ( i = 0 ; i < nfiles ; i++ ) {
		listCopy[i] = list[i];
	}
	listCopy[i] = NULL;

	return listCopy;
}

void	Sys_FreeFileList( char **list ) {
	int		i;

	if ( !list ) {
		return;
	}

	for ( i = 0 ; list[i] ; i++ ) {
		Z_Free( list[i] );
	}

	Z_Free( list );
}


const char* Sys_Cwd()
{
	static char cwd[MAX_OSPATH];

	getcwd( cwd, sizeof( cwd ) - 1 );
	cwd[MAX_OSPATH-1] = 0;

	return cwd;
}


const char* Sys_DefaultHomePath()
{
	if (*homePath)
		return homePath;

	const char* p;
	if (p = getenv("HOME")) {
		Q_strncpyz(homePath, p, sizeof(homePath));
#ifdef MACOS_X
		Q_strcat(homePath, sizeof(homePath), "/Library/Application Support/Quake3");
#else
		Q_strcat(homePath, sizeof(homePath), "/.q3a");
#endif
		if (mkdir(homePath, 0777)) {
			if (errno != EEXIST)
				Sys_Error("Unable to create directory \"%s\", error is %s(%d)\n", homePath, strerror(errno), errno);
		}
		return homePath;
	}

	return ""; // assume current dir
}


void Sys_ShowConsole( int visLevel, qboolean quitOnClose )
{
}


const char* Sys_GetCurrentUser()
{
	const struct passwd* p;

	if (!(p = getpwuid(getuid())))
		return "player";

	return p->pw_name;
}