<?php

/**
 * Contao Open Source CMS
 * Copyright (C) 2005-2011 Leo Feyer
 *
 * Formerly known as TYPOlight Open Source CMS.
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program. If not, please visit the Free
 * Software Foundation website at <http://www.gnu.org/licenses/>.
 *
 * PHP version 5
 * @copyright  cgo IT, 2013
 * @author     Carsten Götzinger (info@cgo-it.de)
 * @package    rateit
 * @license    GNU/LGPL
 * @filesource
 */

namespace cgoIT\rateit;

class rateitBackendModule extends \BackendModule
{
	protected $strTemplate;
	protected $actions = array();

	protected $rateit;

	protected $tl_root;
	protected $tl_files;
	protected $languages;

	private $compiler;
	private $action = '';
	private $parameter = '';

	private $arrExportHeader;
	private $arrExportHeaderDetails;

	/**
	 * Anzahl der Herzen/Sterne
	 * @var int
	 */
	protected $intStars = 5;

	protected $label;
	protected $labels;

	/**
	 * Initialize the controller
	 */
	public function __construct($objElement=array()) {
		parent::__construct($objElement);

		$this->label = $GLOBALS['TL_CONFIG']['rating_type'] == 'hearts' ? $GLOBALS['TL_LANG']['rateit']['heart'] : $GLOBALS['TL_LANG']['rateit']['star'];
		$this->labels = $GLOBALS['TL_CONFIG']['rating_type'] == 'hearts' ? $GLOBALS['TL_LANG']['rateit']['hearts'] : $GLOBALS['TL_LANG']['rateit']['stars'];

		$this->actions = array(
				//	  act[0]			strTemplate					compiler
				array('',				'rateitbe_ratinglist',		'listRatings' ),
				array('reset_ratings',	'',							'resetRatings' ),
				array('view',			'rateitbe_ratingview',		'viewRating' ),
				array('export',			'',							'exportRatings' ),
				array('exportDetails',	'',							'exportRatingDetails' ),
		);

		$this->loadLanguageFile('rateit_backend');
		$this->arrExportHeader = &$GLOBALS['TL_LANG']['tl_rateit']['xls_headers'];
		$this->arrExportHeaderDetails = &$GLOBALS['TL_LANG']['tl_rateit']['xls_headers_detail'];
	}

	/**
	 * Generate module:
	 * - Display a wildcard in the back end
	 * - Select the template and compiler in the front end
	 * @return string
	 */
	public function generate()
	{
		$this->rateit = new \stdClass();
		$rateit = &$this->rateit;
		$rateit->username	= $this->BackendUser->username;
		$rateit->isadmin	= $this->BackendUser->isAdmin;

		$this->strTemplate  = $this->actions[0][1];
		$this->compiler	    = $this->actions[0][2];

		$act = \Input::get('act');
		if (!$act) $act = \Input::post('act');
		foreach ($this->actions as $action) {
			if ($act == $action[0]) {
				$this->parameter   = $act;
				$this->action      = $action[0];
				$this->strTemplate = $action[1];
				$this->compiler    = $action[2];
				break;
			}
		}

		$stars = intval($GLOBALS['TL_CONFIG']['rating_count']);
		if ($stars > 0) {
			$this->intStars = $stars;
		}

		return str_replace(array('{{', '}}'), array('[{]', '[}]'), parent::generate());
	} // generate

	/**
	 * Compile module: common initializations and forwarding to distinct function compiler
	 */
	protected function compile()
	{
		// hide module?
		$compiler = $this->compiler;
		if ($compiler=='hide') return;

		// load other helpers
		$this->tl_root = str_replace("\\",'/',TL_ROOT).'/';
		$this->tl_files = str_replace("\\",'/',$GLOBALS['TL_CONFIG']['uploadPath']).'/';
		$this->Template->rateit = $this->rateit;

		// complete rateit initialization
		$rateit             = &$this->rateit;
		$rateit->f_link	    = $this->createUrl(array($this->action => $this->parameter));
		$rateit->f_action	= $this->compiler;
		$rateit->f_mode	    = $this->action;
		$rateit->theme		= new RateItBackend();
		$rateit->backLink	= $this->getReferer(true);
		$rateit->homeLink	= $this->createUrl();

		// execute compiler
		$this->$compiler($this->parameter);
	} // compile

	/**
	 * List the ratings
	 */
	protected function listRatings()
	{
		$rateit = &$this->Template->rateit;
		$rateit->f_page = 0;

		// returning from submit?
		if ($this->filterPost('rateit_action') == $rateit->f_action) {
			// get url parameters
			$rateit->f_typ 		= trim(\Input::post('rateit_typ'));
			$rateit->f_active	= trim(\Input::post('rateit_active'));
			$rateit->f_order	= trim(\Input::post('rateit_order'));
			$rateit->f_page	    = trim(\Input::post('rateit_page'));
			$rateit->f_find	    = trim(\Input::post('rateit_find'));
			$this->Session->set(
					'rateit_settings',
					array(
							'rateit_typ'	  => $rateit->f_typ,
							'rateit_order'	  => $rateit->f_order,
							'rateit_page'	  => $rateit->f_page,
							'rateit_find'	  => $rateit->f_find
					)
			);
		} else {
			$stg = $this->Session->get('rateit_settings');
			if (is_array($stg)) {
				$rateit->f_typ	 	= trim($stg['rateit_typ']);
				$rateit->f_active	= trim($stg['rateit_active']);
				$rateit->f_order	= trim($stg['rateit_order']);
				$rateit->f_page	    = trim($stg['rateit_page']);
				$rateit->f_find	    = trim($stg['rateit_find']);
			} // if
		} // if

		if ($rateit->f_order=='') $rateit->f_order = 'rating';
		//if (!isset($rateit->f_active)) $rateit->f_active = '-1';

		if (isset($GLOBALS['TL_CONFIG']['rating_listsize']))
			$perpage = (int)trim($GLOBALS['TL_CONFIG']['rating_listsize']);
		if (!isset($perpage) || $perpage < 0) $perpage = 10;

		if ($rateit->f_page>=0 && $perpage>0) {
			$options['first'] = $rateit->f_page * $perpage;
			$options['limit'] = $perpage;
		} // if
		if ($rateit->f_typ	 	!= '') $options['typ']			= $rateit->f_typ;
		if ($rateit->f_active 	!= '') $options['active']		= $rateit->f_active == '0' ? '' : $rateit->f_active;
		if ($rateit->f_find	    != '') $options['find']			= $rateit->f_find;

		switch ($rateit->f_order) {
			case 'title'	 : $options['order'] = 'title'; break;
			case 'typ'		 : $options['order'] = 'typ'; break;
			case 'createdat' : $options['order'] = 'createdat'; break;
			default			 : $options['order'] = 'rating desc';
		} // switch

		$rateit->exportLink = $this->createUrl(array('act' => 'export'));

		// query extensions
		$rateit->ratingitems = $this->getRatingItems($options);
		if ($rateit->f_page>=0 && $perpage>0 && count($rateit->ratingitems)==0) {
			$rateit->f_page = 0;
			$options['first'] = 0;
			$rateit->ratingitems = $this->getRatingItems($options);
		} // if

		// add view links
		foreach ($rateit->ratingitems as &$ext) {
			$ext->viewLink = $this->createUrl(array('act' => 'view', 'rkey' => $ext->rkey, 'typ' => $ext->typ));
			$totrecs = $ext->totcount;
		} // foreach

		// create pages list
		$rateit->pages = array();
		if ($perpage > 0) {
			$first = 1;
			while ($totrecs > 0) {
				$cnt = $totrecs > $perpage ? $perpage : $totrecs;
				$rateit->pages[] = $first . ' - ' . ($first+$cnt-1);
				$first += $cnt;
				$totrecs -= $cnt;
			} // while
		} // if
	} // listRatings

	/**
	 * Export all ratings as MS-Excel-File
	 */
	protected function exportRatings()
	{
		$this->import('String');
		$rateit = &$this->Template->rateit;

		$options['order'] = 'rating desc';

		// query ratings
		$rateit->ratingitems = $this->getRatingItems($options, true);

		$xls = new \xlsexport();
		$strXlsSheet = $GLOBALS['TL_LANG']['tl_rateit']['xls_sheetname_ratings'];
		$xls->addworksheet($strXlsSheet);

		$intRowCounter = -1;
		$intColCounter = 0;

		$intRowCounter++;

		// Header setzen
		foreach(array_values($this->arrExportHeader) as $header) {
			$xls->setcell(array("sheetname" => $strXlsSheet,"row" => $intRowCounter, "col" => $intColCounter, "data" => $header, "fontweight" => XLSFONT_BOLD, "vallign" => XLSXF_VALLIGN_TOP, "fontfamily" => XLSFONT_FAMILY_NORMAL));
			$xls->setcolwidth($strXlsSheet, $intColCounter, 0x1aff);
			$intColCounter++;
		}

		$intRowCounter++;

		// Werte setzen
		foreach($rateit->ratingitems as $item) {
			$arrItem = (array)$item;
				
			$intColCounter = 0;
			foreach(array_keys($this->arrExportHeader) as $key) {
				$strVal = $arrItem[$key];
				$strVal = $this->String->decodeEntities($strVal);
				$strVal = preg_replace(array('/<br.*\/*>/si'), array("\n"), $strVal);
				$strVal = $this->convertEncoding($strVal, $GLOBALS['TL_CONFIG']['characterSet'], 'CP1252');

				$cellType = CELL_STRING;
				switch ($key) {
					case 'typ' :
						$strVal = $GLOBALS['TL_LANG']['tl_rateit_type_options'][$strVal];
						break;
					case 'createdat' :
						$strVal = $strVal ? date($GLOBALS['TL_CONFIG']['datimFormat'], $strVal) : '';
						break;
					case 'active' :
						$strVal = $strVal == '1' ? 'Ja' : 'Nein';
						break;
					case 'rating' :
						if (!isset($strVal) || empty($strVal)) {
							$strVal = '0';
						}
						$cellType = CELL_FLOAT;
						break;
					case 'stars' :
					case 'percent' :
					case 'totalRatings' :
					case 'rkey' :
						$cellType = CELL_FLOAT;
						break;
				}
				$xls->setcell(array("sheetname" => $strXlsSheet,"row" => $intRowCounter, "col" => $intColCounter, "data" => $strVal, "type" => $cellType, "vallign" => XLSXF_VALLIGN_TOP, "fontfamily" => XLSFONT_FAMILY_NORMAL));
				$intColCounter++;
			}
				
			$intRowCounter++;
		}

		$xls->sendfile("export_rateit_" . date("Ymd_His") . ".xls");
		exit;
	} // exportRatings

	/**
	 * Detailed view of one rating.
	 * @param string
	 */
	protected function viewRating()
	{
		$rateit = &$this->Template->rateit;

		$rateit->f_page = 0;

		// returning from submit?
		if ($this->filterPost('rateit_action') == $rateit->f_action) {
			// get url parameters
			$rateit->f_page	    = trim(\Input::post('rateit_details_page'));
			$this->Session->set(
					'rateit_settings',
					array(
							'rateit_details_page'	  => $rateit->f_page
					)
			);
		} else {
			$stg = $this->Session->get('rateit_settings');
			if (is_array($stg)) {
				$rateit->f_page	    = trim($stg['rateit_details_page']);
			} // if
		} // if

		$rkey = \Input::get('rkey');
		if (strstr($rkey, '|')) {
			$arrRkey = explode('|', $rkey);
			foreach ($arrRkey as $key) {
				if (!is_numeric($key)) {
					$this->redirect($rateit->homeLink);
					exit;
				}
				$id = $rkey;
			}
		} else {
			if (is_numeric($rkey)) {
				$id = $rkey;
			} else {
				$this->redirect($rateit->homeLink);
				exit;
			}
		}

		$typ = \Input::get('typ');

		// compose base options
		$options = array(
				'rkey' 	=> $rkey,
				'typ' 	=> $typ
		);

		$this->rateit->f_link = $this->createUrl(array('act' => 'view', 'rkey' => $rkey, 'typ' => $typ));

		if (isset($GLOBALS['TL_CONFIG']['rating_listsize']))
			$perpage = (int)trim($GLOBALS['TL_CONFIG']['rating_listsize']);
		if (!isset($perpage) || $perpage < 0) $perpage = 10;

		if ($rateit->f_page>=0 && $perpage>0) {
			$options['first'] = $rateit->f_page * $perpage;
			$options['limit'] = $perpage;
		} // if

		$rateit->ratingitems = $this->getRatingItems($options, true);
		if (count($rateit->ratingitems)<1) $this->redirect($rateit->homeLink);
		$ext = &$rateit->ratingitems[0];

		$ext->ratings = $this->getRatings($ext, $options);
		if ($rateit->f_page>=0 && $perpage>0 && count($ext->ratings)==0) {
			$rateit->f_page = 0;
			$options['first'] = 0;
			$rateit->ratings = $this->getRatings($ext, $options);
		} // if

		if (count($ext->ratings) > 0) {
			$totrecs = $ext->ratings[0]->totcount;
		} else {
			$totrecs = 0;
		}

		// create pages list
		$rateit->pages = array();
		if ($perpage > 0) {
			$first = 1;
			while ($totrecs > 0) {
				$cnt = $totrecs > $perpage ? $perpage : $totrecs;
				$rateit->pages[] = $first . ' - ' . ($first+$cnt-1);
				$first += $cnt;
				$totrecs -= $cnt;
			} // while
		} // if

		$rateit->exportLink = $this->createUrl(array('act' => 'exportDetails', 'rkey' => $rkey, 'typ' => $typ));

		$ext->statistics = $this->getRatingStatistics($ext->item_id);
		$ext->ratingsChartData = $this->getRatingsChartData($ext->statistics);
		$ext->monthsChartData = $this->getMonthsChartData($ext->item_id);
	} // viewRating

	protected function resetRatings()
	{
		$rateit = &$this->Template->rateit;

		// nothing checked?
		$ids0 = \Input::post('selectedids');
		if (!is_array($ids0)) {
			$this->redirect($rep->homeLink); return;
		}

		foreach ($ids0 as $id) {
			list($rkey, $typ) = explode('__', $id);
			$pid = $this->Database->prepare('SELECT id FROM tl_rateit_items WHERE rkey=? and typ=?')
						  ->execute($rkey, $typ)
						  ->fetchRow();
			$this->Database->prepare('DELETE FROM tl_rateit_ratings WHERE pid=?')
			     ->execute($pid[0]);
		}

		$this->redirect($rateit->homeLink);

	} // resetRatings

	/**
	 * Export the details of one rating as MS-Excel-File
	 */
	protected function exportRatingDetails()
	{
		$rkey = \Input::get('rkey');
		if (!is_numeric($rkey))
			$this->redirect($rateit->backLink);
		$typ = \Input::get('typ');

		$this->rateit->backLink = $this->createUrl(array('act' => 'view', 'rkey' => $rkey, 'typ' => $typ));

		// compose base options
		$options = array(
				'rkey' 	=> $rkey,
				'typ' 	=> $typ
		);

		$this->import('String');
		$rateit = &$this->Template->rateit;

		// query ratings
		$rateit->ratingitems = $this->getRatingItems($options);
		if (count($rateit->ratingitems)<1) $this->redirect($rateit->backLink);
		$ext = &$rateit->ratingitems[0];
		$ext->ratings = $this->getRatings($ext);
		$ext->statistics = $this->getRatingStatistics($ext->item_id);

		$xls = new \xlsexport();
		$strXlsSheet = $GLOBALS['TL_LANG']['tl_rateit']['xls_sheetname_rating'];
		$xls->addworksheet($strXlsSheet);

		$intRowCounter = -1;
		$intColCounter = 0;

		$intRowCounter++;

		// Header setzen
		foreach(array_values($this->arrExportHeaderDetails) as $header) {
			$xls->setcell(array("sheetname" => $strXlsSheet,"row" => $intRowCounter, "col" => $intColCounter, "data" => $header, "fontweight" => XLSFONT_BOLD, "vallign" => XLSXF_VALLIGN_TOP, "fontfamily" => XLSFONT_FAMILY_NORMAL));
			$xls->setcolwidth($strXlsSheet, $intColCounter, 0x1aff);
			$intColCounter++;
		}

		$intRowCounter++;

		// Werte setzen
		foreach($ext->ratings as $item) {
			$arrItem = (array)$item;
				
			$intColCounter = 0;
			foreach(array_keys($this->arrExportHeaderDetails) as $key) {
				$strVal = $arrItem[$key];
				$strVal = $this->String->decodeEntities($strVal);
				$strVal = preg_replace(array('/<br.*\/*>/si'), array("\n"), $strVal);
				$strVal = $this->convertEncoding($strVal, $GLOBALS['TL_CONFIG']['characterSet'], 'CP1252');

				$cellType = CELL_STRING;
				switch ($key) {
					case 'createdat' :
						$strVal = $strVal ? date($GLOBALS['TL_CONFIG']['datimFormat'], $strVal) : '';
						break;
					case 'rating' :
						if (!isset($strVal) || empty($strVal)) {
							$strVal = '0';
						}
						$cellType = CELL_FLOAT;
						break;
					case 'stars' :
					case 'percent' :
					case 'totalRatings' :
					case 'rkey' :
						$cellType = CELL_FLOAT;
						break;
				}
				$xls->setcell(array("sheetname" => $strXlsSheet,"row" => $intRowCounter, "col" => $intColCounter, "data" => $strVal, "type" => $cellType, "vallign" => XLSXF_VALLIGN_TOP, "fontfamily" => XLSFONT_FAMILY_NORMAL));
				$intColCounter++;
			}
				
			$intRowCounter++;
		}

		$xls->sendfile("export_rateit_" . date("Ymd_His") . ".xls");
		exit;
	} // exportRatingDetails

	/**
	 * Create url for hyperlink to the current page.
	 * @param array $aParams Assiciative array with key/value pairs as parameters.
	 * @return string The create link.
	 */
	protected function createUrl($aParams = null)
	{
		return $this->createPageUrl(\Input::get('do'), $aParams);
	} // createUrl

	/**
	 * Create url for hyperlink to an arbitrary page.
	 * @param string $aPage The page ID.
	 * @param array $aParams Assiciative array with key/value pairs as parameters.
	 * @return string The create link.
	 */
	protected function createPageUrl($aPage, $aParams = null)
	{
		$url = \Environment::get('script') . '?do='.$aPage;
		if (is_array($aParams)) {
			foreach ($aParams as $key => $val)
				if ($val!='')
				$url .= '&amp;'.$key .'='.$val;
		}
		return $url;
	} // createPageUrl

	/**
	 * Get post parameter and filter value.
	 * @param string $aKey The post key. When filtering html, remove all attribs and
	 * keep the plain tags.
	 * @param string $aMode '': no filtering
	 *						'nohtml': strip all html
	 *						'text': Keep tags p br ul li em
	 * @return string The filtered input.
	 */
	protected function filterPost($aKey, $aMode = '')
	{
		$v = trim(\Input::postRaw($aKey));
		if ($v == '' || $aMode=='') return $v;
		switch ($aMode) {
			case 'nohtml':
				$v = strip_tags($v);
				break;
			case 'text':
				$v = strip_tags($v, rateit_TEXTTAGS);
				break;
		} // switch
		$v = preg_replace('/<(\w+) .*>/U', '<$1>', $v);
		return $v;
	} // filterPost

	protected function getRatingItems($aOptions, $noLimit=false) {
		$sql = "SELECT i.id as item_id,
				i.rkey AS rkey,
				i.title as title,
				i.typ as typ,
				i.createdat as createdat,
				i.active as active,
				IFNULL(AVG(r.rating),0) AS rating,
				COUNT( r.rating ) AS totalRatings
				FROM tl_rateit_items i
				LEFT OUTER JOIN tl_rateit_ratings r
				ON (i.id = r.pid)
				%w
				GROUP BY rkey, title, item_id, typ, createdat, active
				%o
				%l";

		$cntSql = "SELECT COUNT(*) FROM tl_rateit_items i %s";

		$where = '';
		$firstWhere = true;
		$limit = '';
		$order = '';

		foreach ($aOptions as $k=>$v) {
			if ($k == 'find') {
				if (!$firstWhere) {
					$where .= " AND";
				}
				$where .= " title like '%$v%'";
				$firstWhere = false;
			}
			else if ($k != 'order' && $k != 'limit' && $k != 'first') {
				if (!$firstWhere) {
					$where .= " AND";
				}
				$where .= " $k='$v'";
				$firstWhere = false;
			} else {
				if ($k == 'limit' && !$noLimit) {
					$cntRows = $v;
				} else if ($k == 'first' && !$noLimit) {
					$first = $v;
				}
			}
		}

		if (isset($cntRows) && isset($first)) {
			$limit = "LIMIT $first, $cntRows";
		}

		if (strlen($where) > 0) {
			$where = "WHERE ".$where;
		}

		if (isset($aOptions['order']) && !empty($aOptions['order']))
			$order = "ORDER BY ".$aOptions['order'];

		$sql = str_replace('%o', $order, $sql);
		$sql = str_replace('%w', $where, $sql);
		$sql = str_replace('%l', $limit, $sql);

		$cntSql = str_replace('%s', $where, $cntSql);

		$count = $this->Database->query($cntSql)->fetchRow();

		$arrRatingItems = $this->Database->query($sql)->fetchAllAssoc();
		$arrReturn = array();
		foreach ($arrRatingItems as $rating) {
			if ($rating['active'] != '1') $rating['active'] = '0';
			$rating['percent'] = $rating['rating'];
			$rating['rating'] = $this->percentToStars($rating['percent']);
			$rating['stars'] = $this->intStars;
			$rating['totcount'] = $count[0];
			$arrReturn[] = (object) $rating;
		}
		return $arrReturn;
	} // getRatingItems

	protected function getRatings($ext, $options = array()) {
		// Gesamtanzahl (für Paging wichtig) ermitteln
		$cntSql = "SELECT COUNT(*) FROM tl_rateit_ratings r WHERE r.pid=$ext->item_id";
		$count = $this->Database->prepare($cntSql)
		->execute()
		->fetchRow();

		foreach ($options as $k=>$v) {
			if ($k == 'limit') {
				$cntRows = $v;
			} else if ($k == 'first') {
				$first = $v;
			}
		}

		if (isset($cntRows) && isset($first)) {
			$limit = "LIMIT $first, $cntRows";
		}

		$sql = "SELECT id AS rating_id, ip_address AS ip, memberid, rating, createdat
		FROM tl_rateit_ratings r
		WHERE r.pid=$ext->item_id
		ORDER BY createdat DESC
		%l";
		$sql = str_replace('%l', $limit, $sql);

		$arrRatings = $this->Database->prepare($sql)
		->execute()
		->fetchAllAssoc();
		$arrReturn = array();
		foreach ($arrRatings as $rating) {
			$rating['percent'] = $rating['rating'];
			$rating['rating'] = $this->percentToStars($rating['percent']);
			$rating['stars'] = $this->intStars;
			$rating['totcount'] = $count[0];
			if ($rating['memberid'] != null) {
				$member = $this->Database->prepare("SELECT firstname, lastname FROM tl_member WHERE id=?")
				                         ->limit(1)
				                         ->execute($rating['memberid'])
				                         ->fetchAssoc();
				$rating['member'] = $member['firstname']." ".$member['lastname'];
			}
			$arrReturn[] = (object) $rating;
		}
		return $arrReturn;
	} // getRatings

	protected function getRatingStatistics($item_id) {
		$sql = "SELECT rating, count(*) as count
		FROM tl_rateit_ratings r
		WHERE r.pid=$item_id
		GROUP BY rating
		ORDER BY rating";

		$arrRatingStatistics = $this->Database->prepare($sql)
		->execute()
		->fetchAllAssoc();
		$arrReturn = array();
		foreach ($arrRatingStatistics as $rating) {
			$rating['percent'] = $rating['rating'];
			$rating['rating'] = $this->percentToStars($rating['percent']);
			$arrReturn[$rating['percent']] = (object) $rating;
		}
		return $arrReturn;
	} // getRatings

	protected function getRatingsChartData($statistics) {
		$arr = array();
		$arr['cols'] = array();
		$arr['rows'] = array();

		// Spalten anlegen
		$arr['cols'][] = array('id'=>'rating', 'label'=>$GLOBALS['TL_LANG']['tl_rateit']['rating_chart_legend'][2], 'type'=>'string');
		$arr['cols'][] = array('id'=>'count', 'label'=>$GLOBALS['TL_LANG']['tl_rateit']['rating_chart_legend'][3], 'type'=>'number');

		// Zeilen anlegen
		foreach($statistics as $obj) {
			$arr['rows'][] = array('c'=>array(array('v'=>$obj->rating.' '.($obj->rating == 1 ? $this->label : $this->labels)), array('v'=>(int)$obj->count, 'f'=>$obj->count.' '.$GLOBALS['TL_LANG']['tl_rateit']['vote'][$obj->count == 1 ? 0 : 1])));
		}
		return json_encode($arr);
	}

	protected function getMonthsChartData($item_id) {

		$sql = "SELECT count(*) AS anzahl, avg(rating) AS bewertung, month(date(FROM_UNIXTIME(createdat))) AS monat, year(date(FROM_UNIXTIME(createdat))) AS jahr
		FROM tl_rateit_ratings r
		WHERE r.pid=$item_id
		GROUP BY monat, jahr
		ORDER BY jahr DESC , monat DESC
		LIMIT 0 , 12";

		$arrResult = $this->Database->prepare($sql)
		->execute()
		->fetchAllAssoc();

		$arrResult = array_reverse($arrResult);

		$this->loadLanguageFile('default');

		$arr = array();
		$arr['cols'] = array();
		$arr['rows'] = array();

		// Spalten anlegen
		$arr['cols'][] = array('id'=>'month', 'label'=>$GLOBALS['TL_LANG']['tl_rateit']['month_chart_legend'][3], 'type'=>'string');
		$arr['cols'][] = array('id'=>'count', 'label'=>$GLOBALS['TL_LANG']['tl_rateit']['month_chart_legend'][4], 'type'=>'number');
		$arr['cols'][] = array('id'=>'avg', 'label'=>$GLOBALS['TL_LANG']['tl_rateit']['month_chart_legend'][2], 'type'=>'number');

		// Zeilen anlegen
		foreach($arrResult as $result) {
			$month = $GLOBALS['TL_LANG']['MONTHS'][$result['monat']-1].' '.$result['jahr'];
			$avgValue = round((float)(($result['bewertung']*$this->intStars)/100), 1);
			$arr['rows'][] = array('c'=>array(array('v'=>$month),
					array('v'=>(int)$result['anzahl']),
					array('v'=>$avgValue)));
		}
		return json_encode($arr);
	}

	protected function percentToStars($percent) {
		$modifier = 100 / $this->intStars;
		return round($percent / $modifier, 1);
	}

	/**
	 * Convert encoding
	 * @return String
	 * @param $strString String to convert
	 * @param $from charset to convert from
	 * @param $to charset to convert to
	 */
	public function convertEncoding($strString, $from, $to) {
		if (USE_MBSTRING) {
			@mb_substitute_character('none');
			return @mb_convert_encoding($strString, $to, $from);
		}
		elseif (function_exists('iconv')) {
			if (strlen($iconv = @iconv($from, $to . '//IGNORE', $strString))) {
				return $iconv;
			}
			else {
				return @iconv($from, $to, $strString);
			}
		}
		return $strString;
	}
} // class rateitBackendModule