<?php

/**
 * @file
 * Contains bootstrap_layouts.module.
 */

use Drupal\bootstrap_layouts\BootstrapLayout;
use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\NestedArray;
use Drupal\Core\Render\Element;
use Drupal\Core\Template\Attribute;
use Drupal\layout_plugin\Layout;

/**
 * Implements hook_theme_registry_alter().
 */
function bootstrap_layouts_theme_registry_alter(&$theme_registry) {
  // Find all Bootstrap Layouts.
  $layouts = Layout::layoutPluginManager()->getDefinitions();
  $layout_theme_hooks = [];
  foreach ($layouts as $info) {
    if ($info['class'] === '\Drupal\bootstrap_layouts\Plugin\Layout\BootstrapLayoutsBase') {
      $layout_theme_hooks[] = $info['theme'];
    }
  }

  // Add a special internal preprocess function.
  foreach ($theme_registry as $theme_hook => $info) {
    if (in_array($theme_hook, $layout_theme_hooks) || (!empty($info['base hook']) && in_array($info['base hook'], $layout_theme_hooks))) {
      $theme_registry[$theme_hook]['preprocess functions'][] = '_bootstrap_layouts_preprocess_layout';
    }
  }
}

/**
 * Parses an attribute string saved in the UI.
 *
 * @param string $string
 *   The attribute string to parse.
 * @param array $tokens
 *   An associative array of token data to use.
 *
 * @return array
 *   A parsed attributes array.
 */
function _bootstrap_layouts_parse_attributes($string = NULL, array $tokens = []) {
  static $token;
  if (!isset($token)) {
    /** @var \Drupal\Core\Utility\Token $token */
    $token = \Drupal::service('token');
  }
  $attributes = [];
  if (!empty($string)) {
    $parts = explode(',', $string);
    foreach ($parts as $attribute) {
      if (strpos($attribute, '|') !== FALSE) {
        list($key, $value) = explode('|', $token->replace($attribute, $tokens, ['clear' => TRUE]));
        $attributes[$key] = $value;
      }
    }
  }
  return $attributes;
}

/**
 * Internal preprocess callback.
 *
 * This is used to determine standardize variables to use in Bootstrap Layouts
 * templates based on whatever implementation is used (i.e. Display Suite or
 * Panels, etc.).
 *
 * @param array $variables
 *   Variables array, passed by reference.
 */
function _bootstrap_layouts_preprocess_layout(array &$variables) {
  // Utilize the BootstrapLayout utility class to normalize DX readability here.
  $layout = new BootstrapLayout($variables['layout']['id'], [], $variables['settings']);


  // Determine the entity, entity type and bundle.
  /** @var \Drupal\Core\Entity\EntityInterface $entity */
  $entity = isset($variables['content']['#entity']) ? $variables['content']['#entity'] : FALSE;
  $entity_type = isset($variables['content']['#entity_type']) ? $variables['content']['#entity_type'] : FALSE;
  $bundle = isset($variables['content']['#bundle']) ? $variables['content']['#bundle'] : FALSE;
  $view_mode = isset($variables['content']['#view_mode']) ? $variables['content']['#view_mode'] : FALSE;

  $tokens = [];
  if ($entity_type && $entity) {
    $tokens[$entity_type] = $entity;

    // Copy entity to top level to improve theme experience.
    $variables[$entity_type] = $entity;
  }

  // Add a layout wrapper and its attributes.
  $variables['wrapper'] = $layout->getSetting('layout.wrapper', 'div');
  $layout_attributes = isset($variables['attributes']) ? $variables['attributes'] : [];
  $layout_attributes = NestedArray::mergeDeep(_bootstrap_layouts_parse_attributes($layout->getSetting('layout.attributes'), $tokens), $layout_attributes);

  $attributes = new Attribute($layout_attributes);
  $attributes->addClass(array_keys($layout->getSetting('layout.classes', [])));
  if ($layout->getSetting('layout.add_layout_class')) {
    $attributes->addClass(Html::cleanCssIdentifier($layout->getId()));
  }

  // Unfortunately since Display Suite doesn't abstract this bit of code, it
  // must be duplicated in this module to support it from the UI.
  if ($entity_type && isset($variables['content']['#ds_configuration'])) {
    // Add theming-classes to template.
    $entity_classes = !empty($variables['content']['#ds_configuration']['layout']['entity_classes']) ? $variables['content']['#ds_configuration']['layout']['entity_classes'] : 'old_view_mode';
    if ($entity_classes !== 'no_classes') {
      if ($entity_classes === 'all_classes') {
        $entity_type_class = Html::cleanCssIdentifier($entity_type);
        $entity_classes = [$entity_type_class];
        if ($bundle) {
          $entity_classes[] = "$entity_type_class--type-" . Html::cleanCssIdentifier($bundle);
        }
        if ($view_mode) {
          $entity_classes[] = "$entity_type_class--view-mode-" . Html::cleanCssIdentifier($view_mode);
        }
        $attributes->addClass($entity_classes);
      }
      // Add (old style, non cleaned) view-mode-{name} to classes.
      elseif ($entity_classes === 'old_view_mode' && $view_mode && !$attributes->hasClass("view-mode-$view_mode")) {
        $attributes->addClass("view-mode-$view_mode");
      }
    }

    // Let other modules know we have rendered.
    $variables['rendered_by_ds'] = TRUE;

    // Let other modules alter the ds array before rendering.
    $context = [
      'entity' => $entity,
      'entity_type' => $entity_type,
      'bundle' => $bundle,
      'view_mode' => $view_mode,
    ];
    \Drupal::moduleHandler()->alter('ds_pre_render', $variables['content'], $context, $variables);
  }

  // Set the attributes variable.
  $variables['attributes'] = $attributes;

  // Create region variables based on the layout settings.
  foreach ($layout->getSetting('regions') as $region => $region_settings) {
    $region_attributes = new Attribute(_bootstrap_layouts_parse_attributes($region_settings['attributes'], $tokens));
    $region_attributes->addClass(array_keys($region_settings['classes']));
    if (!empty($region_settings['add_region_classes'])) {
      $region_attributes->addClass(['bs-region', Html::cleanCssIdentifier("bs-region--$region")]);
    }
    unset($region_settings['classes']);
    $region_settings['attributes'] = $region_attributes;
    $region_settings['content'] = isset($variables['content'][$region]) && !Element::isEmpty($variables['content'][$region]) ? $variables['content'][$region] : NULL;
    $variables[$region] = $region_settings;
  }
}