<?php

/**
 * @file
 * General functions and hook implementations for Hierarchy Manager module.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function hierarchy_manager_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the hierarchy_manager module.
    case 'help.page.hierarchy_manager':
      $output = '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Hierarchy Manager module provides a flexible solution for managing hierarchies of menu links and taxonomy terms. Unlike the default Drupal draggable table, this module supports massive hierarchies and offers a plugin architecture for customization.') . '</p>';
      $output .= '<p>' . t('Out of the box, the module comes with two plugins: a taxonomy hierarchy management plugin and a menu hierarchy plugin. The front-end JavaScript libraries are also pluginable, with an out-of-the-box display plugin using jsTree to render the hierarchy tree with a filter. The hierarchy tree is draggable, allowing you to easily update the hierarchy by dragging a node in the tree.') . '</p>';
    return $output;
  }
}

/**
 * Implements hook_library_info_alter().
 */
function hierarchy_manager_library_info_alter(array &$libraries, $module) {
  if ('hierarchy_manager' == $module) {
    // Use CDN instead of all local missing libraries.
    // jsTree min js.
    $cdn_library = _hierarchy_manager_use_cdn($libraries, 'libraries.jquery.jstree', 'js');
    if ($cdn_library) {
      $libraries['libraries.jquery.jstree']['js'] = $cdn_library;
    }
    // jsTree default theme.
    $cdn_library = _hierarchy_manager_use_cdn($libraries, 'libraries.jquery.jstree.default', 'css');
    if ($cdn_library) {
      $libraries['libraries.jquery.jstree.default']['css']['component'] = $cdn_library;
    }
    // jsTree dark theme.
    $cdn_library = _hierarchy_manager_use_cdn($libraries, 'libraries.jquery.jstree.default-dark', 'css');
    if ($cdn_library) {
      $libraries['libraries.jquery.jstree.default-dark']['css']['component'] = $cdn_library;
    }
    // jsoneditor min js.
    $cdn_library = _hierarchy_manager_use_cdn($libraries, 'libraries.jsoneditor', 'js');
    if ($cdn_library) {
      $libraries['libraries.jsoneditor']['js'] = $cdn_library;
    }
    // jsoneditor default theme.
    $cdn_library = _hierarchy_manager_use_cdn($libraries, 'libraries.jsoneditor.default-theme', 'css');
    if ($cdn_library) {
      $libraries['libraries.jsoneditor.default-theme']['css']['component'] = $cdn_library;
    }
  }
}

/**
 * Implement hook_entity_type_alter().
 * 
 * @param array $entity_types
 *   Entity type information array.
 */
function hierarchy_manager_entity_type_alter(array &$entity_types) {
  // Override the menu edit form.
  $entity_types['menu']
  ->setFormClass('edit', 'Drupal\hierarchy_manager\Form\HmMenuForm');
}

/**
 * Replace local library with CDN.
 *
 * @param array $libraries
 *   The libraries array.
 * @param string $library_name
 *   The library name.
 * @param string $type
 *   The library type.
 * @param bool $replace_local
 *   Force to replace local libraries with CDN.
 *
 * @return array
 *   The new library array (CDN)
 */
function _hierarchy_manager_use_cdn(array $libraries, $library_name, $type, $replace_local = FALSE) {
  if (isset($libraries[$library_name])) {
    if (isset($libraries[$library_name][$type]) && isset($libraries[$library_name]['cdn'])) {
      $library_array = [];
      $updated = FALSE;
      // CSS library has a sub-array called component.
      if ($type === 'css') {
        if (isset($libraries[$library_name][$type]['component'])) {
          $local_library = $libraries[$library_name][$type]['component'];
        }
        else {
          return FALSE;
        }
      }
      else {
        // Local js library.
        $local_library = $libraries[$library_name][$type];
      }
      foreach ($local_library as $key => $value) {
        if (!file_exists(DRUPAL_ROOT . $key) || $replace_local) {
          // The js file doesn't exist.
          // Replace it with remote cdn.
          $library_array[$libraries[$library_name]['cdn'] . basename($key)] = $value;
          $updated = TRUE;
        }
        else {
          $library_array[$key] = $value;
        }
      }
    }
  }

  return empty($updated) ? FALSE : $library_array;
}