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Filename : gkrating.php
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<?php
defined ('_JEXEC') or die ('Restricted access');

class PlgContentGKRating extends JPlugin {

	/**
	 * Load the language file on instantiation
	 */
	protected $autoloadLanguage = true;
	protected $config = '';

	public function __construct(&$subject, $config){
		$this->config = json_decode($config['params']);
        parent::__construct($subject, $config);
    }

	/**
	 * Adds additional fields to article editing form
	 *
	 * @return  boolean
	 */
	public function onContentPrepareForm($form, $data){

		if (!($form instanceof JForm)){
			$this->_subject->setError('JERROR_NOT_A_FORM');
			return false;
		}

		if($form->getName() == 'com_content.article'){
			JForm::addFormPath(__DIR__ . '/forms');
			$form->loadFile('rating', false);
			$doc = JFactory::getDocument();
			$doc->addScript(JURI::root() . 'media/jui/js/jquery.ui.core.min.js');
			$doc->addScript(JURI::root() . 'media/jui/js/jquery.ui.sortable.min.js');
			$doc->addScript(JURI::root() . 'plugins/content/gkrating/assets/gkrating.js');
			$doc->addStyleSheet(JURI::root() . 'plugins/content/gkrating/assets/gkrating.css');
			return true;
		} else {
			return true;
		}
	}

	public function onContentPrepare($context, &$article, &$params, $page = 0){
		// border cases 
		$canProceed = $context == 'com_content.article';
		if (!$canProceed){ return; }
	 	if(strpos($article->text,'{rating}') === false){ return; }
		$attribs = json_decode($article->attribs);
		$showOverall = isset($attribs->show_overall) ? $attribs->show_overall : false;
		$ratings = isset($attribs->rates) ? json_decode($attribs->rates) : false;
		$doc = JFactory::getDocument();

		if(isset($this->config->default_css) && $this->config->default_css === '1'){
			$doc->addStyleSheet(JURI::root() . '/plugins/content/gkrating/assets/style.css');
		}
		if(isset($this->config->progressbar_js) && $this->config->progressbar_js === '1'){
			JHtml::_('jquery.framework'); // required by default jQuery is loading later
			$doc->addScript(JURI::root() . 'plugins/content/gkrating/assets/progressbar.min.js');
			$doc->addScript(JURI::root() . 'plugins/content/gkrating/assets/script.js');
		}

		// variables init
		$output = '';
		$rating_sum = 0;

		// no content - nothing to render
		if(!$ratings){ return; }

		// prepare output HTML
		$output .= '<span data-pb="enter" class="gk-review clearfix">';
		if($showOverall){
			foreach ($ratings as $key => $rate) {
				$rating_sum += floatval($rate->val);
			}
			$rating_sum = round($rating_sum/count($ratings), 1);
			$output .= '<span class="gk-review-sum">';
			$output .= '<span class="gk-review-sum-value" data-final="'.($rating_sum/10).'"><span>'.$rating_sum.'</span></span>';
			$output .= '<span class="gk-review-sum-label">' . JText::_('PLG_CONTENT_GKRATING_OVERALL') . '</span>';
			$output .= '</span>'; // .gk-review-sum
		}
		$output .= '<span class="gk-review-partials">';

		// Partial results
		$width = 'style="width:'.floatval(100/count($ratings)).'%'.'"';
		foreach ($ratings as $key => $rate) {
			$rate_value = floatval($rate->val);
			$output .= '<span class="gk-review-partial" '.$width.'>';
			$output .= '<span class="gk-review-partial-value" data-final="'.($rate_value/10).'"><span>'.$rate_value.'</span></span>';
			$output .= '<span class="gk-review-partial-label">' .  $rate->label. '</span>';
			$output .= '</span>'; // .gk-review-partial
		}
		$output .= '</span>'; // .gk-review-partials
		$output .= '</span>'; // .gk-review
		$article->text = str_replace('{rating}', $output, $article->text);
		
	}
}