<?php

/**
 * @file
 * Install file for PDF module.
 */

/**
 * Implements hook_requirements().
 *
 * Set a status message to indicate if PDF.js library can be located.
 */
function pdf_requirements($phase) {
  $requirements = array();

  switch ($phase) {
    case 'runtime':

      // Check for the PDF.js library.
      $pdfjs_lib = libraries_detect('pdf.js');

      // PDF.js is working correctly.
      if ($pdfjs_lib['installed']) {
        $value = $pdfjs_lib['version'];
        $description = FALSE;
        $severity = REQUIREMENT_OK;
      }
      // PDF.js not found.
      else {
        $value = t('Not installed');
        $description = t('PDF.js cannot be found. Download PDF.js from !pdfjs-site, and extract it into your Drupal libraries directory. The folder in your libraries folder must be named pdf.js. (!more-info)',
          array(
            '!pdfjs-site' => l('http://mozilla.github.io/pdf.js', 'http://mozilla.github.io/pdf.js/getting_started/#download'),
            '!more-info' => l(t('more information'), 'https://www.drupal.org/project/pdf'),
          )
        );
        $severity = REQUIREMENT_ERROR;
      }

      // Declare requirement to Drupal.
      $requirements[] = array(
        'title' => t('PDF.js'),
        'value' => $value,
        'description' => $description,
        'severity' => $severity,
      );
      break;
  }

  return $requirements;
}