";
$stats_path = @$_SERVER['DOCUMENT_ROOT']."/statsdata/";
$sess_file = $stats_path."session.log";
$close_session = "5"; //how long user session lives
$rand_page_code = rand(0,100000);

function get_user_id($ip)
{
    $user_id = "";
    if (file_exists($GLOBALS["sess_file"]))
    {
        $t_rec = file($GLOBALS["sess_file"]);
        $pattern="";
        foreach($t_rec as $key=>$val)
        {
            $pattern="/([^ ]*?) ([^ ]*?) ([^ ]*?) \'(.*?)\' \'(.*?)\' \'(.*?)\' \'(.*?)\' \'(.*?)\' \'(.*?)\'/is";
            if ((preg_match_all($pattern,$val,$matches)>0) && ($matches[3][0]==$ip))
            {
                $user_id=$matches[2][0];
                break;
            }
        }
    }
    $user_id = ($user_id!="")? $user_id: generate_user_id();
    store_action($user_id);
    return $user_id;
}

function generate_user_id()
{
    //key should depends on project, date
    //and unic and randomly
    $code = $GLOBALS["project_code"].date("dmYHis");
    $str_help = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz';
    for ($i = 0; $i < 128; $i++)
        $code .= $str_help[rand(0,strlen($str_help)-1)];
    return $code;
}

function store_action($user_id)
{
    //save user data into file
    $f = fopen($GLOBALS["sess_file"],"a+");
    //rewind($f);
    fwrite($f,time()." ".$user_id." ".$_SERVER["REMOTE_ADDR"]." '".@$_SERVER["HTTP_USER_AGENT"]."' '".(isset($_SERVER["HTTP_REFERER"]) ? $_SERVER["HTTP_REFERER"] : '')."' '".(isset($GLOBALS["stats_action"]) ? $GLOBALS["stats_action"] : '')."' '".(isset($GLOBALS["stats_param1"]) ? $GLOBALS["stats_param1"] : '')."' '".(isset($GLOBALS["stats_param2"]) ? $GLOBALS["stats_param2"] : '')."' '".(isset($GLOBALS["stats_param3"]) ? $GLOBALS["stats_param3"] : '')."' '".(isset($GLOBALS["rand_page_code"]) ? $GLOBALS["rand_page_code"] : '')."'\r\n");
    fclose($f);
}

function clear_closed_session()
{
    //seek file session which are older then 30 minutes
    //write them into file corresponds day
    //remove them from file
    $close_from = time()-$GLOBALS["close_session"]*60;
    echo "truncating records from ".$close_from."<br>";
    $f = fopen($GLOBALS["sess_file"],"r+");
    $res = "";
    $open_files = array();
    while ($s=fgets($f))
    {
        $dt = explode(" ",$s);
        if ($dt[0]<$close_from)
        {
            if (!isset($open_files[date("d_m_Y",$dt[0])]))
                $open_files[date("d_m_Y",$dt[0])]=fopen($GLOBALS["stats_path"].date("d_m_Y",$dt[0]).".txt","a+");
            fwrite($open_files[date("d_m_Y",$dt[0])],$s);
        }
        else
            $res.=$s;
    }
    foreach($open_files as $key=>$val)
        fclose($val);
    if ($res!=="")
    {
        fclose($f);
        $f=fopen($GLOBALS["sess_file"],"w+");
        fwrite($f,$res);
//        ftruncate($f,$last);
//        echo "ftruncate".$last."<br>";
    }
    fclose($f);
}

function get_statistyc($time_start)
{
    if ($time_start==-1)
        $time_start = time()-60*60*24*31;
    
    $t = $time_start;
    $cur_time = time();
    while ($t<$cur_time)
    {
        $fname = $GLOBALS["stats_path"].date("d_m_Y",$t).".txt";
        if (file_exists($fname))
        {
            echo file_get_contents($fname);
        }
        $t+=60*60*24;
    }
}
//additional info, using javascript
if (isset($_GET["act"])&&($_GET["act"]=="make_cron_section"))
    clear_closed_session();
elseif (isset($_GET["act"])&&($_GET["act"]=="get_statistyc")&&($_GET["project_code"]==$project_code))
    get_statistyc($_GET["time_start"]);
else
{
if (!isset($nojs) || ($nojs!=1))
{
?>
<script>
    var id_user="<? echo get_user_id($_SERVER["REMOTE_ADDR"]); ?>";
    var project_code="<? echo $project_code; ?>";
    var rand_page_code="<? echo $rand_page_code; ?>";
    document.cookie="id_user="+id_user+"; path=/; expires=<? echo date("D, d-m-Y H:i:s"); ?>";
</script>
<?
if (isset($GLOBALS["videostats"])&&($GLOBALS["videostats"]==1)) {
?>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script src="http://stats.vecem.com/js/counter.js"></script>
<?
}
}
else 
  get_user_id($_SERVER["REMOTE_ADDR"]);
}
?>