<?php

/**
 * @file
 * Allows configuring blocks and other configuration from the site front-end.
 */

use Drupal\Core\Asset\AttachedAssetsInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\settings_tray\Block\BlockEntityOffCanvasForm;
use Drupal\settings_tray\Form\SystemBrandingOffCanvasForm;
use Drupal\settings_tray\Form\SystemMenuOffCanvasForm;

/**
 * Implements hook_help().
 */
function settings_tray_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.settings_tray':
      $output = '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Settings Tray module provides an \'edit mode\' in which clicking on a block opens a slide-out tray which allows configuration to be altered without leaving the page.For more information, see the <a href=":settings-tray-documentation">online documentation for the Settings Tray module</a>.', [':settings-tray-documentation' => 'https://www.drupal.org/documentation/modules/settings_tray']) . '</p>';
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Editing blocks on the same page in the slide-out tray') . '</dt>';
      $output .= '</dl>';
      return ['#markup' => $output];
  }
}

/**
 * Implements hook_contextual_links_view_alter().
 *
 * Change Configure Blocks into off_canvas links.
 */
function settings_tray_contextual_links_view_alter(&$element, $items) {
  if (isset($element['#links']['settings-trayblock-configure'])) {
    // Place settings_tray link first.
    $settings_tray_link = $element['#links']['settings-trayblock-configure'];
    unset($element['#links']['settings-trayblock-configure']);
    $element['#links'] = ['settings-trayblock-configure' => $settings_tray_link] + $element['#links'];

    // If this is content block change title to avoid duplicate "Quick Edit".
    if (isset($element['#links']['block-contentblock-edit'])) {
      $element['#links']['settings-trayblock-configure']['title'] = t('Quick edit settings');
    }

    $element['#attached']['library'][] = 'settings_tray/drupal.off_canvas';
  }
}

/**
 * Implements hook_block_view_alter().
 */
function settings_tray_block_view_alter(array &$build) {
  // Force a new 'data-contextual-id' attribute on blocks when this module is
  // enabled so as not to reuse stale data cached client-side.
  // @todo Remove when https://www.drupal.org/node/2773591 is fixed.
  $build['#contextual_links']['settings_tray'] = [
    'route_parameters' => [],
  ];
}

/**
 * Implements hook_element_info_alter().
 */
function settings_tray_element_info_alter(&$type) {
  if (isset($type['page'])) {
    $type['page']['#theme_wrappers']['settings_tray_page_wrapper'] = ['#weight' => -1000];
  }
}

/**
 * Implements hook_theme().
 */
function settings_tray_theme() {
  return [
    'settings_tray_page_wrapper' => [
      'variables' => ['children' => NULL],
    ],
  ];
}

/**
 * Implements hook_entity_type_build().
 */
function settings_tray_entity_type_build(array &$entity_types) {
  /* @var $entity_types \Drupal\Core\Entity\EntityTypeInterface[] */
  $entity_types['block']
    ->setFormClass('off_canvas', BlockEntityOffCanvasForm::class)
    ->setLinkTemplate('off_canvas-form', '/admin/structure/block/manage/{block}/off-canvas');
}

/**
 * Implements hook_preprocess_HOOK() for block templates.
 */
function settings_tray_preprocess_block(&$variables) {
  // Only blocks that have an settings_tray form 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 ($access_checker->accessBlockPlugin($block_plugin)->isAllowed()) {
    // Add class and attributes to all blocks to allow Javascript to target.
    $variables['attributes']['class'][] = 'settings-tray-editable';
    $variables['attributes']['data-drupal-settingstray'] = 'editable';
  }
}

/**
 * Implements hook_toolbar_alter().
 *
 * Alters the 'contextual' toolbar tab if it exists (meaning the user is allowed
 * to use contextual links) and if they can administer blocks.
 *
 * @todo Remove the "administer blocks" requirement in
 *   https://www.drupal.org/node/2822965.
 *
 * @see contextual_toolbar()
 */
function settings_tray_toolbar_alter(&$items) {
  $items['contextual']['#cache']['contexts'][] = 'user.permissions';
  if (isset($items['contextual']['tab']) && \Drupal::currentUser()->hasPermission('administer blocks')) {
    $items['contextual']['#weight'] = -1000;
    $items['contextual']['#attached']['library'][] = 'settings_tray/drupal.settings_tray';
    $items['contextual']['tab']['#attributes']['data-drupal-settingstray'] = 'toggle';

    // Set a class on items to mark whether they should be active in edit mode.
    // @todo Create a dynamic method for modules to set their own items.
    //   https://www.drupal.org/node/2784589.
    $edit_mode_items = ['contextual', 'block_place'];
    foreach ($items as $key => $item) {
      if (!in_array($key, $edit_mode_items) && (!isset($items[$key]['#wrapper_attributes']['class']) || !in_array('hidden', $items[$key]['#wrapper_attributes']['class']))) {
        $items[$key]['#wrapper_attributes']['class'][] = 'edit-mode-inactive';
      }
    }
  }
}

/**
 * Implements hook_block_alter().
 *
 * Ensures every block plugin definition has an 'settings_tray' form specified.
 *
 * @see \Drupal\settings_tray\Access\BlockPluginHasSettingsTrayFormAccessCheck
 */
function settings_tray_block_alter(&$definitions) {
  foreach ($definitions as &$definition) {
    // If a block plugin already defines its own 'settings_tray' form, use that
    // form instead of specifying one here.
    if (isset($definition['forms']['settings_tray'])) {
      continue;
    }

    switch ($definition['id']) {
      // Use specialized forms for certain blocks that do not yet provide the
      // form with their own annotation.
      // @todo Move these into the corresponding block plugin annotations in
      //   https://www.drupal.org/node/2896356.
      case 'system_menu_block':
        $definition['forms']['settings_tray'] = SystemMenuOffCanvasForm::class;
        break;

      case 'system_branding_block':
        $definition['forms']['settings_tray'] = SystemBrandingOffCanvasForm::class;
        break;

      // No off-canvas form for the page title block, despite it having
      // contextual links: it's too confusing that you're editing configuration,
      // not content, so the title itself cannot actually be changed.
      // @todo Move these into the corresponding block plugin annotations in
      //   https://www.drupal.org/node/2896356.
      case 'page_title_block':
        $definition['forms']['settings_tray'] = FALSE;
        break;

      case 'system_main_block':
        $definition['forms']['settings_tray'] = FALSE;
        break;

      case 'help_block':
        $definition['forms']['settings_tray'] = FALSE;
        break;

      // Otherwise, use the block plugin's normal form rather than
      // a custom form for Settings Tray.
      default:
        $definition['forms']['settings_tray'] = $definition['class'];
        break;
    }
  }
}

/**
 * Implements hook_css_alter().
 */
function settings_tray_css_alter(&$css, AttachedAssetsInterface $assets) {
  // @todo Remove once conditional ordering is introduced in
  //   https://www.drupal.org/node/1945262.
  $path = drupal_get_path('module', 'settings_tray') . '/css/settings_tray.theme.css';
  if (isset($css[$path])) {
    // Use 200 to come after CSS_AGGREGATE_THEME.
    $css[$path]['group'] = 200;
  }
}