<?php
/* Copyright (C) 2015 Daniel Preussker <f0o@devilcode.org>
 * 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.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. */

/**
 * Device-Grouping
 * @author Daniel Preussker <f0o@devilcode.org>
 * @copyright 2015 f0o, LibreNMS
 * @license GPL
 * @package LibreNMS
 * @subpackage Devices
 */

/**
 * Generate SQL from Group-Pattern
 * @param string $pattern Pattern to generate SQL for
 * @param string $search What to searchid for
 * @return string
 */
function GenGroupSQL($pattern,$search='') {
	$tmp = explode(" ",$pattern);
	$tables = array();
	foreach( $tmp as $opt ) {
		if( strstr($opt,'%') && strstr($opt,'.') ) {
			$tmpp = explode(".",$opt,2);
			$tmpp[0] = str_replace("%","",$tmpp[0]);
			$tables[] = mres(str_replace("(","",$tmpp[0]));
			$pattern = str_replace($opt,$tmpp[0].'.'.$tmpp[1],$pattern);
		}
	}
	$tables = array_keys(array_flip($tables));
	$x = sizeof($tables);
	$i = 0;
	$join = "";
	while( $i < $x ) {
		if( isset($tables[$i+1]) ) {
			$join .= $tables[$i].".device_id = ".$tables[$i+1].".device_id && ";
		}
		$i++;
	}
	if( !empty($search) ) {
		$search .= " &&";
	}
	$sql = "SELECT DISTINCT(".str_replace("(","",$tables[0]).".device_id) FROM ".implode(",",$tables)." WHERE ".$search." (".str_replace(array("%","@","!~","~"),array("","%","NOT LIKE","LIKE"),$pattern).")";
	return $sql;
}

/**
 * Get all devices of Group
 * @param int $group_id Group-ID
 * @return string
 */
function GetDevicesFromGroup($group_id) {
	$pattern = dbFetchCell("SELECT pattern FROM device_groups WHERE id = ?",array($group_id));
	if( !empty($pattern) ) {
		return dbFetchRows(GenGroupSQL($pattern));
	}
	return false;
}

/**
 * Get all Device-Groups
 * @return array
 */
function GetDeviceGroups() {
	return dbFetchRows("SELECT * FROM device_groups");
}

/**
 * Get all groups of Device
 * @param int $device Device-ID
 * @return array
 */
function GetGroupsFromDevice($device) {
	$ret = array();
	foreach( GetDeviceGroups() as $group ) {
		if( dbFetchCell(GenGroupSQL($group['pattern'],'device_id=?').' LIMIT 1',array($device)) == $device ){
			$ret[] = $group['id'];
		}
	}
	return $ret;
}
?>