<?php

/**
 * @file
 * Local Fonts module file.
 */

use Drupal\Core\Entity\EntityInterface;
use Drupal\local_fonts\Entity\LocalFontConfigEntity;

/**
 * Implements hook_fontyourface_api().
 */
function local_fonts_fontyourface_api() {
  return [
    'version' => '3',
    'name' => 'Custom Fonts',
  ];
}

/**
 * Implements hook_page_attachments().
 */
function local_fonts_page_attachments(&$page) {
  $enabled_fonts = &drupal_static('fontyourface_fonts', []);
  foreach ($enabled_fonts as $font) {
    if ($font->pid->value == 'local_fonts') {
      $metadata = $font->getMetadata();
      $font_id = $metadata['id'];
      $directory = file_build_uri('fontyourface/local_fonts/' . $font_id);
      $page['#attached']['html_head'][] = [
        [
          '#type' => 'html_tag',
          '#tag' => 'link',
          '#attributes' => [
            'rel' => 'stylesheet',
            'href' => file_create_url($directory . '/font.css'),
            'media' => 'all',
          ],
        ], 'local-fonts-' . $font_id,
      ];
    }
  }
}

/**
 * Implements hook_entity_presave().
 */
function local_fonts_entity_presave(EntityInterface $entity) {
  if ($entity instanceof LocalFontConfigEntity) {
    // Save and generate necessary font files.
    local_fonts_save_and_generate_css($entity);

    // Save Font in FYF DB storage.
    $font_data = new \stdClass();
    $font_data->name = $entity->label();
    $font_data->url = 'local_fonts://' . $entity->id();
    $font_data->provider = 'local_fonts';
    $font_data->css_family = $entity->font_family;
    $font_data->css_weight = $entity->font_weight;
    $font_data->css_style = $entity->font_style;
    $font_data->classification = array_filter($entity->font_classification);
    $font_data->language = [
      'English',
    ];
    $font_data->metadata = [
      'id' => $entity->id(),
    ];
    fontyourface_save_font($font_data);
  }
}

/**
 * Implements hook_entity_delete().
 */
function local_fonts_entity_delete(EntityInterface $entity) {
  if ($entity instanceof LocalFontConfigEntity) {
    $font_id = 'local_fonts://' . $entity->id();
    $fids = \Drupal::entityQuery('font')
      ->condition('url', $font_id)
      ->range(0, 50)
      ->execute();
    if (!empty($fids)) {
      $storage_handler = \Drupal::entityManager()->getStorage('font');
      $fonts = $storage_handler->loadMultiple(array_keys($fids));
      $storage_handler->delete($fonts);
    }
  }
}

/**
 * Saves and generates font file based on font config entity data.
 *
 * @param Drupal\local_fonts\Entity\LocalFontConfigEntity $font_entity
 *   Custom config font entity.
 *
 * @return bool
 *   TRUE if files save successfully. Throw any errors otherwise.
 */
function local_fonts_save_and_generate_css(LocalFontConfigEntity $font_entity) {
  $directory = file_build_uri('fontyourface/local_fonts/' . $font_entity->id());
  $css_file = $directory . '/font.css';
  $font_file = $directory . '/font.woff';
  file_prepare_directory($directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);

  $css_file_data = "@font-face {\n";
  $css_file_data .= "font-family: '" . $font_entity->font_family . "';\n";
  $css_file_data .= "font-weight: " . $font_entity->font_weight . ";\n";
  $css_file_data .= "font-style: " . $font_entity->font_style . ";\n";
  $css_file_data .= "src: url('font.woff') format('woff');\n";
  $css_file_data .= "}\n";

  file_unmanaged_save_data(base64_decode($font_entity->getFontWoffData()), $font_file, FILE_EXISTS_REPLACE);
  file_unmanaged_save_data($css_file_data, $css_file, FILE_EXISTS_REPLACE);

  return TRUE;
}