<?php
/**
 * Statistics Plugin
 *
 * @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author  Andreas Gohr <andi@splitbrain.org>
 */

class helper_plugin_statistics extends Dokuwiki_Plugin {

    private $dblink = null;
    public  $prefix;
    private $oQuery  = null;
    private $oLogger = null;
    private $oGraph  = null;

    /**
     * Return an instance of the query class
     *
     * @return object
     */
    public function Query(){
        $this->prefix = $this->getConf('db_prefix');
        if(is_null($this->oQuery)){
            require dirname(__FILE__).'/inc/StatisticsQuery.class.php';
            $this->oQuery = new StatisticsQuery($this);
        }
        return $this->oQuery;
    }

    /**
     * Return an instance of the logger class
     *
     * @return object
     */
    public function Logger(){
        $this->prefix = $this->getConf('db_prefix');
        if(is_null($this->oLogger)){
            require dirname(__FILE__).'/inc/StatisticsLogger.class.php';
            $this->oLogger = new StatisticsLogger($this);
        }
        return $this->oLogger;
    }

    /**
     * Return an instance of the Graph class
     *
     * @return object
     */
    public function Graph(){
        $this->prefix = $this->getConf('db_prefix');
        if(is_null($this->oGraph)){
            require dirname(__FILE__).'/inc/StatisticsGraph.class.php';
            $this->oGraph = new StatisticsGraph($this);
        }
        return $this->oGraph;
    }

    /**
     * Return a link to the DB, opening the connection if needed
     */
    protected function dbLink(){
        // connect to DB if needed
        if(!$this->dblink){
            $this->dblink = mysql_connect($this->getConf('db_server'),
                                          $this->getConf('db_user'),
                                          $this->getConf('db_password'));
            if(!$this->dblink){
                msg('DB Error: connection failed',-1);
                return null;
            }
            // set utf-8
            if(!mysql_db_query($this->getConf('db_database'),'set names utf8',$this->dblink)){
                msg('DB Error: could not set UTF-8 ('.mysql_error($this->dblink).')',-1);
                return null;
            }
        }
        return $this->dblink;
    }

    /**
     * Simple function to run a DB query
     */
    public function runSQL($sql_string) {
        $link = $this->dbLink();

        $result = mysql_db_query($this->conf['db_database'],$sql_string,$link);
        if(!$result){
            dbglog('DB Error: '.mysql_error($link).' '.hsc($sql_string),-1);
            msg('DB Error: '.mysql_error($link).' '.hsc($sql_string),-1);
            return null;
        }

        $resultarray = array();

        //mysql_db_query returns 1 on a insert statement -> no need to ask for results
        if ($result != 1) {
            for($i=0; $i< mysql_num_rows($result); $i++) {
                $temparray = mysql_fetch_assoc($result);
                $resultarray[]=$temparray;
            }
            mysql_free_result($result);
        }

        if (mysql_insert_id($link)) {
            $resultarray = mysql_insert_id($link); //give back ID on insert
        }

        return $resultarray;
    }


    /**
     * Just send a 1x1 pixel blank gif to the browser
     *
     * @called from log.php
     *
     * @author Andreas Gohr <andi@splitbrain.org>
     * @author Harry Fuecks <fuecks@gmail.com>
     */
    function sendGIF($transparent = true){
        if($transparent){
            $img = base64_decode('R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAEALAAAAAABAAEAAAIBTAA7');
        }else{
            $img = base64_decode('R0lGODdhAQABAIAAAP///////ywAAAAAAQABAAACAkQBADs=');
        }
        header('Content-Type: image/gif');
        header('Content-Length: '.strlen($img));
        header('Connection: Close');
        print $img;
        flush();
        // Browser should drop connection after this
        // Thinks it's got the whole image
    }
}