<?php
if (!isset($config)) require_once($_SERVER['DOCUMENT_ROOT'].'/maintenance/config.db.php');

if (!defined('_DB_HOST') && isset($config['db_host'])) define('_DB_HOST',$config['db_host']);
if (!defined('_DB_NAME') && isset($config['db_user'])) define('_DB_NAME',$config['db_user']);
if (!defined('_DB_USER') && isset($config['db_user'])) define('_DB_USER',$config['db_user']);
if (!defined('_DB_PASS') && isset($config['db_pass'])) define('_DB_PASS',$config['db_pass']);

class MySqlHelper {
	public static $msh;
	public static $writelog;
  
	
	private $host;
	private $name;
	private $user;
	private $pass;
	
	private $connection;
	
	private $queryString;
	private $queryResult;
	
	public function __construct() {
		$this->connection=false;
		$this->host='';
		$this->user='';
		$this->pass='';
		$this->name='';
    $this->writelog=FALSE;
	}
	
	/**
	 * Return the instance
	 * 
	 * @return MySqlHelper
	 */
	public static function getInstance() {
		if(!empty(self::$msh)) return self::$msh;
		self::$msh=new MySqlHelper();
		self::$msh->init();
		return self::$msh;
	}
  
  public static function escapeString($str="")
  {
    $ret=mysqli_real_escape_string($this->connection,$str);
    return($ret);
  }
	
	public function init($host=_DB_HOST, $name=_DB_NAME, $user=_DB_USER, $pass=_DB_PASS) {
		$this->host=$host;
		$this->name=$name;
		$this->user=$user;
		$this->pass=$pass;
	}
	
	private function connect() {
		if($this->connection) return;
		
		$this->connection=mysqli_connect($this->host, $this->user, $this->pass);

		if(false===$this->connection) throw new Exception('Can\'t connect to db');
		
		mysqli_select_db($this->connection,$this->name);
		mysqli_query($this->connection, 'SET CHARACTER SET UTF8');
		mysqli_query($this->connection, 'SET NAMES \'UTF8\' ');
		mysqli_set_charset($this->connection, 'utf8');
		
		if(mysqli_error($this->connection)) throw new Exception(mysqli_error($this->connection));
	}
	
	public function query($query) {
		$this->connect();
		$this->queryString=$query;
    
		if ($this->is_write_type($query) === TRUE)
		{
      $boolWrite=TRUE;
      $arrSkip=array('h_aktivalas_infok','h_history','u_history','u_userstatus_history','userstats2013','cl_hlusers.switch','cl_hlusers.writelog');
      foreach ($arrSkip as $tabla) { if (strpos($query,$tabla)) {$boolWrite=FALSE;break;} } 

      if ($boolWrite==TRUE)    
      {
        mysqli_query($this->connection, "INSERT INTO `cl_hlusers`.`writelog` (`user`,`datum`,`ip`,`url`,`func`,`sql`) VALUES (
          '".(isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : 'www.archlinexp.com' )."',
          '".date("Y-m-d H:i:s",time())."',
          '".(isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '127.0.0.1')."',
          '".(isset($_SERVER['SERVER_NAME']) ? addslashes($_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI']) : '')."',
          '".addslashes("function: ".__FUNCTION__." method: ".__METHOD__)."','".addslashes($query)."');");
      } 
    }     
    
		$this->queryResult=mysqli_query($this->connection, $query);
		if(mysqli_error($this->connection)) throw new Exception(mysqli_error($this->connection).' Query: '.$this->queryString);
	}
	
	public function fetchNext() {
		$back=array();
		if($row=mysqli_fetch_assoc($this->queryResult)) {
			foreach($row as $key => $value) {
				$row[$key]=stripslashes($value);
			}
			$back=$row;
			return $back;
		}
		
		return false;
	}
	
	public function fetchAssoc() {
		$back=array();
		while($row=mysqli_fetch_assoc($this->queryResult)) {
			foreach($row as $key => $value) {
				$row[$key]=stripslashes($value);
			}
			$back[]=$row;
		}
		
		return $back;
	}
	
	public function getInsertedId() {
		return mysqli_insert_id($this->connection);	
	}
	
	public function select($table, $where=false, $offset=false, $limit=false, $order=false) {
		$whereStr='';
		$limitStr='';
		$orderStr='';
		
		if(is_array($where)) $whereStr='WHERE '.$this->whereMakerPriv($where);
		elseif($where) $whereStr='WHERE '.$where;

		if(($offset!==false and $offset!==null)&&($limit!==false and $limit!==null)) {
			$limitStr='LIMIT '.$offset.', '.$limit;
		}

		if(is_array($order)) {
			$orderStr='ORDER BY ';
			foreach($order as $key => $value) {
				$orderStr.=$key.' '.$value.' ';
			}
		}
		elseif($order) $orderStr='ORDER BY '.$order; 
		
		return $this->query('SELECT * FROM '.$table.' '.$whereStr.' '.$orderStr.' '.$limitStr);
	}
	
	public function getProp($table, $func, $field, $where=false) {
		$whereStr='';
		if(is_array($where)) $whereStr='WHERE '.$this->whereMakerPriv($where);
		elseif($where) $whereStr='WHERE '.$where;
		
		$this->query('SELECT '.$func.'('.$field.') as p FROM '.$table.' '.$whereStr);
		
		$arr=$this->fetchAssoc();
		
		return $arr[0]['p'];
	}
	
	public function getCount($table, $field='id', $where=false) {
		return $this->getProp($table, 'COUNT', $field, $where);
	}
	
	public function getSum($table, $field='id', $where=false) {
		return $this->getProp($table, 'SUM', $field, $where);
	}
	
	public function getAvg($table, $field='id', $where=false) {
		return $this->getProp($table, 'AVG', $field, $where);
	}
	
	public function delete($table, $where=false) {
		$whereStr='';
		if(is_array($where)) $whereStr='WHERE '.$this->whereMakerPriv($where);
		elseif($where) $whereStr='WHERE '.$where;
		
		return $this->query('DELETE FROM '.$table.' '.$whereStr);
	}
	
	public function update($table, $infoArr, $where=false) {
		if(!is_array($infoArr)) {
			return false;			
		}
		
		$whereStr='';
		$dataArr=array();
		$data='';
		if(is_array($where)) $whereStr='WHERE '.$this->whereMakerPriv($where);
		elseif($where) $whereStr='WHERE '.$where;
		
		foreach($infoArr as $key => $value) {
			$dataArr[]='`'.$key.'`="'.mysqli_real_escape_string($this->connection,$value).'" ';
		}
		$data=implode(',',$dataArr);
		
		return $this->query('UPDATE '.$table.' SET '.$data.' '.$whereStr);
	}
	
	public function insert($table, $infoArr) {
		$this->connect();
    $columArr=array();
		$valueArr=array();
		$colums='';
		$values='';
		
		foreach($infoArr as $key => $value) {
			$columArr[]='`'.$key.'`';
			$valueArr[]='"'.mysqli_real_escape_string($this->connection, $value).'"';
		}
		
		$colums=implode(',',$columArr);
		$values=implode(',', $valueArr);
		
    return $this->query('INSERT INTO '.$table.' ('.$colums.') VALUES ('.$values.');');
	}
	
	public function affectedRows() {
		return mysqli_affected_rows($this->connection);
	}
	
	public function whereMakerPriv($where) {
		if(!is_array($where)) return 1;
		$this->connect();
		$back='1 ';
		foreach($where as $key=>$value) {
			if(is_array($value)) $back.='AND `'.$key.'`'.$value[0].'"'.$value[1].'" ';
			else $back.='AND `'.$key.'`="'.mysqli_real_escape_string($this->connection,$value).'" ';
		}
		return $back;
	}
	
	public static function whereMaker($where) {
		if(!is_array($where)) return 1;
		$back='1 ';
		foreach($where as $key=>$value) {
			if(is_array($value)) $back.='AND `'.$key.'`'.$value[0].'"'.$value[1].'" ';
			else $back.='AND `'.$key.'`="'.$value.'" ';
		}
		return $back;
	}
  
	public function is_write_type($sql)
	{
		if ( ! preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD DATA|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK)\s+/i', $sql))
		{
			return FALSE;
		}
		return TRUE;
	}
  
  public function getConnection()
  {
    return ($this->connection);
  }
  
  public function setConnect()
  {
		$this->connect();
  }
  
  
}
?>