<?php

/**
 * @file
 * Contains materio_flag.module.
 */

/**
 * Implements hook_module_implements_alter().
 *
 * flag_lists creates one Flag *config* entity per user list (1700+ on this
 * site). Several flag.module hooks call FlagService::getAllFlags() and loop over
 * every flag for each entity view and each entity form, running an isFlagged()
 * query and an access check per flag. This makes node view and, above all, node
 * edit (flag_form_alter) time out.
 *
 * All these flags are configured with show_in_links / show_as_field /
 * show_on_form / show_contextual_link = FALSE and are only consumed through
 * materio_flag (controllers/routes) and the decoupled Vue app, so flag's native
 * entity integration produces nothing visible here. We therefore remove these
 * expensive implementations instead of patching flag.module.
 */
function materio_flag_module_implements_alter(&$implementations, $hook) {
  $hooks_to_remove = [
    // flag_form_alter(): loops all flags on every content entity form
    // (node edit) -> main cause of the 504 gateway timeout.
    'form_alter',
    // flag_entity_view(): builds a flag field render per flag on entity view.
    'entity_view',
    // flag_entity_build_defaults_alter(): sets max-age=0 per contextual flag.
    'entity_build_defaults_alter',
    // flag_entity_view_alter(): adds flag metadata to contextual links.
    'entity_view_alter',
    // flag_entity_extra_field_info(): declares a pseudo-field per flag.
    'entity_extra_field_info',
    // flag_entity_operation(): adds flag operation links per flag.
    'entity_operation',
  ];

  if (in_array($hook, $hooks_to_remove, TRUE) && isset($implementations['flag'])) {
    unset($implementations['flag']);
  }
}