<?php

/**
 * @file
 * Default file for XML sitemap node.
 */

/**
 * Implements hook_entity_info_alter().
 */
function xmlsitemap_node_entity_info_alter(array &$entity_info) {
  $entity_info['node']['label'] = t('Content');
  $entity_info['node']['bundle label'] = t('Content type');
  $entity_info['node']['xmlsitemap'] = array(
    'process callback' => 'xmlsitemap_node_xmlsitemap_process_node_links',
  );
}

/**
 * Implements hook_cron().
 *
 * Process old nodes not found in the {xmlsitemap} table.
 */
function xmlsitemap_node_cron() {
  $limit = xmlsitemap_var('batch_limit');

  // Process nodes that have been queued in hook_node_update().
  $queue = DrupalQueue::get('xmlsitemap_node');
  while ($limit > 0 && $item = $queue->claimItem()) {
    $limit--;
    try {
      $node = node_load($item->data);
      // The node could have been deleted in the meantime, skip XML sitemap
      // updates in this case.
      if ($node) {
        $link = xmlsitemap_node_create_link($node);
        xmlsitemap_link_save($link, array($link['type'] => $node));
      }
      $queue->deleteItem($item);
    }
    catch (Exception $e) {
      // In case of exception log it and leave the item in the queue
      // to be processed again later.
      watchdog_exception('xmlsitemap_node', $e);
    }
  }

  // Add nodes that are missing from the {xmlsitemap} table.
  // This catches nodes that were created prior to this module being enabled.
  xmlsitemap_node_xmlsitemap_index_links($limit);
}

/**
 * Implements hook_xmlsitemap_index_links().
 */
function xmlsitemap_node_xmlsitemap_index_links($limit) {
  if ($types = xmlsitemap_get_link_type_enabled_bundles('node')) {
    $nids = db_query_range("SELECT n.nid FROM {node} n LEFT JOIN {xmlsitemap} x ON x.type = 'node' AND n.nid = x.id WHERE x.id IS NULL AND n.type IN (:types) ORDER BY n.nid DESC", 0, $limit, array(':types' => $types))->fetchCol();
    xmlsitemap_node_xmlsitemap_process_node_links($nids);
  }
}

/**
 * Process node sitemap links.
 *
 * @param array $nids
 *   An array of node IDs.
 */
function xmlsitemap_node_xmlsitemap_process_node_links(array $nids) {
  // Load no more than 15 nodes at a time.
  if (count($nids) >= 1) {
    $nids_chunks = array_chunk($nids, 15);
    foreach ($nids_chunks as $chunk) {
      $nodes = node_load_multiple($chunk);
      foreach ($nodes as $node) {
        $link = xmlsitemap_node_create_link($node);
        xmlsitemap_link_save($link, array($link['type'] => $node));
      }
      // Flush each entity from the load cache after processing, to avoid
      // exceeding PHP memory limits if $nids is large.
      entity_get_controller('node')->resetCache($chunk);
    }
  }
}

/**
 * Implements hook_node_insert().
 */
function xmlsitemap_node_node_insert(stdClass $node) {
  xmlsitemap_node_node_update($node);
}

/**
 * Implements hook_node_update().
 */
function xmlsitemap_node_node_update(stdClass $node) {
  // Save a sitemap link with revoked access until the node permissions are
  // checked in the cron.
  $link = xmlsitemap_node_create_link($node);
  xmlsitemap_link_presave($link, array($link['type'] => $node));
  // Node access can not be accurately determined in hook_node_update() because
  // node grants have not yet been written to the table, so we defer checking
  // node access permissions and process the sitemap link during cron.
  $queue = DrupalQueue::get('xmlsitemap_node');
  $queue->createItem($node->nid);
}

/**
 * Implements hook_node_delete().
 */
function xmlsitemap_node_node_delete(stdClass $node) {
  xmlsitemap_link_delete('node', $node->nid);
}

/**
 * Implements hook_comment_update().
 */
function xmlsitemap_node_comment_update(stdClass $comment) {
  if ($node = entity_load_unchanged('node', $comment->nid)) {
    xmlsitemap_node_node_update($node);
  }
}

/**
 * Implements hook_comment_publish().
 */
function xmlsitemap_node_comment_publish(stdClass $comment) {
  xmlsitemap_node_comment_update($comment);
}

/**
 * Implements hook_comment_unpublish().
 */
function xmlsitemap_node_comment_unpublish(stdClass $comment) {
  xmlsitemap_node_comment_update($comment);
}

/**
 * Implements hook_comment_delete().
 */
function xmlsitemap_node_comment_delete(stdClass $comment) {
  xmlsitemap_node_comment_update($comment);
}

/**
 * Implements hook_field_extra_fields().
 */
function xmlsitemap_node_field_extra_fields() {
  $extras = array();
  foreach (node_type_get_names() as $type => $name) {
    $extras['node'][$type]['form']['xmlsitemap'] = array(
      'label' => t('XML sitemap'),
      'description' => t('XML sitemap module element'),
      'weight' => 30,
    );
  }
  return $extras;
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * @see node_type_form()
 * @see xmlsitemap_add_link_bundle_settings()
 */
function xmlsitemap_node_form_node_type_form_alter(array &$form, array $form_state) {
  $node_type = isset($form['#node_type']->type) ? $form['#node_type']->type : '';
  module_load_include('inc', 'xmlsitemap', 'xmlsitemap.admin');
  xmlsitemap_add_link_bundle_settings($form, $form_state, 'node', $node_type);
}

/**
 * Implements hook_form_alter().
 *
 * @codingStandardsIgnoreLine
 *
 * Add the XML sitemap individual link options for a node.
 *
 * @see xmlsitemap_add_form_link_options()
 */
function xmlsitemap_node_form_node_form_alter(array &$form, array &$form_state) {
  // Add the link options.
  module_load_include('inc', 'xmlsitemap', 'xmlsitemap.admin');
  xmlsitemap_add_form_link_options($form, 'node', $form['type']['#value'], $form['nid']['#value']);
  $form['xmlsitemap']['#weight'] = 30;
}

/**
 * Fetch all the timestamps for when a node was changed.
 *
 * @param object $node
 *   A node object.
 *
 * @return array
 *   An array of UNIX timestamp integers.
 */
function xmlsitemap_node_get_timestamps(stdClass $node) {
  $timestamps = &drupal_static(__FUNCTION__, array());

  if (!isset($timestamps[$node->nid])) {
    $timestamps[$node->nid] = db_query("SELECT nr.timestamp FROM {node_revision} nr WHERE nr.nid = :nid", array(':nid' => $node->nid))->fetchCol();
    if (module_exists('comment')) {
      $comment_timestamps = db_query("SELECT c.created FROM {comment} c WHERE c.nid = :nid AND c.status = :status", array(':nid' => $node->nid, ':status' => COMMENT_PUBLISHED))->fetchCol();
      $timestamps[$node->nid] = array_merge($timestamps[$node->nid], $comment_timestamps);
    }
  }

  return $timestamps[$node->nid];
}

/**
 * Create a sitemap link from a node.
 *
 * The link will be saved as $node->xmlsitemap.
 *
 * @param object $node
 *   A node object.
 */
function xmlsitemap_node_create_link(stdClass $node) {
  if (!isset($node->xmlsitemap) || !is_array($node->xmlsitemap)) {
    $node->xmlsitemap = array();
    if ($node->nid && $link = xmlsitemap_link_load('node', $node->nid)) {
      $node->xmlsitemap = $link;
    }
  }

  $settings = xmlsitemap_link_bundle_load('node', $node->type);
  $uri = entity_uri('node', $node);

  $node->xmlsitemap += array(
    'type' => 'node',
    'id' => $node->nid,
    'subtype' => $node->type,
    'status' => $settings['status'],
    'status_default' => $settings['status'],
    'status_override' => 0,
    'priority' => $settings['priority'],
    'priority_default' => $settings['priority'],
    'priority_override' => 0,
  );

  // Always recalculate changefreq and changecount.
  $timestamps = xmlsitemap_node_get_timestamps($node);
  $node->xmlsitemap['changefreq'] = $node->nid ? xmlsitemap_calculate_changefreq($timestamps) : 0;
  $node->xmlsitemap['changecount'] = $node->nid ? count($timestamps) - 1 : 0;

  // The following values must always be checked because they are volatile.
  $node->xmlsitemap['loc'] = $uri['path'];
  $node->xmlsitemap['lastmod'] = count($timestamps) ? max($timestamps) : 0;
  $node->xmlsitemap['access'] = $node->nid ? xmlsitemap_node_view_access($node, drupal_anonymous_user()) : 1;
  $node->xmlsitemap['language'] = isset($node->language) ? $node->language : LANGUAGE_NONE;

  return $node->xmlsitemap;
}

/**
 * Determine whether a user may view the specified node.
 *
 * @param object $node
 *   The node object on which the operation is to be performed, or node type
 *   (e.g. 'forum') for "create" operation.
 * @param object $account
 *   Optional, a user object representing the user for whom the operation is to
 *   be performed. Determines access for a user other than the current user.
 *
 * @return bool
 *   TRUE if the operation may be performed, FALSE otherwise.
 *
 *   This is for all intesive purposes a copy of Drupal 7's node_access()
 *   function.
 */
function xmlsitemap_node_view_access($node, $account = NULL) {
  global $user;

  $op = 'view';
  $rights = &drupal_static(__FUNCTION__, array());

  if (!$node || !in_array($op, array('view', 'update', 'delete', 'create'), TRUE)) {
    // If there was no node to check against, or the $op was not one of the
    // supported ones, we return access denied.
    return FALSE;
  }
  // If no user object is supplied, the access check is for the current user.
  if (empty($account)) {
    $account = $user;
  }

  // $node may be either an object or a node type. Since node types cannot be
  // an integer, use either nid or type as the static cache id.
  // $cid = is_object($node) ? $node->nid : $node;
  // If we've already checked access for this node, user and op, return from
  // cache.
  if (isset($rights[$account->uid][$node->nid])) {
    return $rights[$account->uid][$node->nid];
  }

  if (user_access('bypass node access', $account)) {
    $rights[$account->uid][$node->nid] = TRUE;
    return TRUE;
  }

  if (!user_access('access content', $account)) {
    $rights[$account->uid][$node->nid] = FALSE;
    return FALSE;
  }

  // We grant access to the node if both of the following conditions are met:
  // - No modules say to deny access.
  // - At least one module says to grant access.
  // If no module specified either allow or deny, we fall back to the
  // node_access table.
  $access = module_invoke_all('node_access', $node, $op, $account);
  if (in_array(NODE_ACCESS_DENY, $access, TRUE)) {
    $rights[$account->uid][$node->nid] = FALSE;
    return FALSE;
  }
  elseif (in_array(NODE_ACCESS_ALLOW, $access, TRUE)) {
    $rights[$account->uid][$node->nid] = TRUE;
    return TRUE;
  }

  // Check if authors can view their own unpublished nodes.
  if ($op == 'view' && !$node->status && user_access('view own unpublished content', $account) && $account->uid == $node->uid && $account->uid != 0) {
    $rights[$account->uid][$node->nid] = TRUE;
    return TRUE;
  }

  // If the module did not override the access rights, use those set in the
  // node_access table.
  if ($op != 'create' && $node->nid) {
    if (module_implements('node_grants')) {
      $query = db_select('node_access');
      $query->addExpression('1');
      $query->condition('grant_' . $op, 1, '>=');
      $nids = db_or()->condition('nid', $node->nid);
      if ($node->status) {
        $nids->condition('nid', 0);
      }
      $query->condition($nids);
      $query->range(0, 1);

      // Fetch the node grants and allow other modules to alter them
      // (D7 backport).
      $grants = &drupal_static(__FUNCTION__ . ':grants', array());
      if (!isset($grants[$account->uid][$op])) {
        // Indicate that this is our special function in the grants.
        $account->xmlsitemap_node_access = TRUE;
        $grants[$account->uid][$op] = node_access_grants($op, $account);
        // Remove the special indicator.
        unset($account->xmlsitemap_node_access);
      }

      $grant_condition = db_or();
      foreach ($grants[$account->uid][$op] as $realm => $gids) {
        foreach ($gids as $gid) {
          $grant_condition->condition(db_and()
            ->condition('gid', $gid)
            ->condition('realm', $realm)
          );
        }
      }
      if (count($grant_condition) > 0) {
        $query->condition($grant_condition);
      }

      $result = (bool) $query->execute()->fetchField();
      $rights[$account->uid][$node->nid] = $result;
      return $result;
    }
    elseif (is_object($node) && $op == 'view' && $node->status) {
      // If no modules implement hook_node_grants(), the default behaviour is to
      // allow all users to view published nodes, so reflect that here.
      $rights[$account->uid][$node->nid] = TRUE;
      return TRUE;
    }
  }

  return FALSE;
}

/**
 * Implements hook_features_pipe_COMPONENT_alter().
 *
 * Add variables to exported node types.
 */
function xmlsitemap_node_features_pipe_node_alter(&$pipe, $data, $export) {
  if (!empty($data)) {
    foreach ($data as $node_type) {
      $pipe['variable'][] = "xmlsitemap_settings_node_{$node_type}";
    }
  }
}