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<?php
namespace Grav\Plugin;

use Grav\Common\Grav;
use Grav\Common\Plugin;
use RocketTheme\Toolbox\Event\Event;

/**
 * Class TableImporterPlugin
 * @package Grav\Plugin
 */
class PDFJsPlugin extends Plugin
{

    protected $outerEscape = null;

    /**
     * @return array
     *
     * The getSubscribedEvents() gives the core a list of events
     *     that the plugin wants to listen to. The key of each
     *     array section is the event that the plugin listens to
     *     and the value (in the form of an array) contains the
     *     callable (or function) as well as the priority. The
     *     higher the number the higher the priority.
     */
    public static function getSubscribedEvents()
    {
        return [
            'onPluginsInitialized' => ['onPluginsInitialized', 0]
        ];
    }

    public function onPluginsInitialized()
    {
        if ($this->isAdmin()) {
            return;
        }

        $this->enable([
			'onShortcodeHandlers' => ['onShortcodeHandlers', 0],
			'onTwigTemplatePaths' => ['onTwigTemplatePaths', 0],
			'onTwigSiteVariables' => ['onTwigSiteVariables', 0]
        ]);
    }

    public function onShortcodeHandlers(Event $e)
    {
        $this->grav['shortcode']->registerShortcode('PDFJsShortcode.php', __DIR__);
    }

    public function onTwigTemplatePaths()
    {
        $this->grav['twig']->twig_paths[] = __DIR__ . '/templates';
    }

    public function onTwigSiteVariables()
    {
      $config = Grav::instance()['config'];
      $technique = $config->get('plugins.pdf-js.technique');
      switch ($technique) {
        case 'pdfjs':      
          $this->grav['assets']->add('plugin://pdf-js/web/viewer.min.css');
          $this->grav['assets']->add('plugin://pdf-js/web/pdf.min.js');
          $this->grav['assets']->add('plugin://pdf-js/web/pdf.worker.min.js');
          break;
        case 'pdfobject':
          $this->grav['assets']->add('plugin://pdf-js/assets/pdfobject.js');
          break;
      }
        
    }
}