<?php

/**
 * @file
 */

use Drupal\block\Entity\Block;
use Drupal\block\BlockInterface;

/**
 * Checks if a block has overrides.
 *
 * @param \Drupal\block\BlockInterface $block
 *   The block to check for overrides.
 *
 * @return bool
 *   TRUE if the block has overrides otherwise FALSE.
 *
 * @internal
 */
function _settings_tray_has_block_overrides(BlockInterface $block) {
  // @todo Replace the following with $block->hasOverrides() in https://www.drupal.org/project/drupal/issues/2910353
  //   and remove this function.
  return \Drupal::config($block->getEntityType()->getConfigPrefix() . '.' . $block->id())->hasOverrides();
}

/**
 * Implements hook_preprocess_HOOK() for block templates.
 */
function settings_tray_preprocess_block(&$variables): void {
  // Only blocks that have a settings_tray form and have no configuration
  // overrides will have a "Quick Edit" link. We could wait for the contextual
  // links to be initialized on the client side,  and then add the class and
  // data- attribute below there (via JavaScript). But that would mean that it
  // would be impossible to show Settings Tray's clickable regions immediately
  // when the page loads. When latency is high, this will cause flicker.
  // @see \Drupal\settings_tray\Access\BlockPluginHasSettingsTrayFormAccessCheck
  /** @var \Drupal\settings_tray\Access\BlockPluginHasSettingsTrayFormAccessCheck $access_checker */
  $access_checker = \Drupal::service('access_check.settings_tray.block.settings_tray_form');
  /** @var \Drupal\Core\Block\BlockManagerInterface $block_plugin_manager */
  $block_plugin_manager = \Drupal::service('plugin.manager.block');
  /** @var \Drupal\Core\Block\BlockPluginInterface $block_plugin */
  $block_plugin = $block_plugin_manager->createInstance($variables['plugin_id']);
  if (isset($variables['elements']['#contextual_links']['block']['route_parameters']['block'])) {
    $block = Block::load($variables['elements']['#contextual_links']['block']['route_parameters']['block']);
    if ($access_checker->accessBlockPlugin($block_plugin)->isAllowed() && !_settings_tray_has_block_overrides($block)) {
      // Add class and attributes to all blocks to allow JavaScript to target.
      $variables['attributes']['class'][] = 'settings-tray-editable';
      $variables['attributes']['data-drupal-settingstray'] = 'editable';
    }
  }
}