<?php

/**
 * @file
 * Admin page callbacks for the block module.
 */

use Drupal\block\Plugin\Core\Entity\Block;
use Drupal\Core\Template\Attribute;

/**
 * Page callback: Attaches CSS for the block region demo.
 *
 * @see block_menu()
 */
function block_admin_demo($theme = NULL) {
  drupal_add_css(drupal_get_path('module', 'block') . '/block.admin.css');
  return '';
}

/**
 * Page callback: Shows the block administration page.
 *
 * @param string $theme
 *   The theme to display the administration page for.
 *
 * @return array
 *   A render array for a page containing a list of blocks.
 *
 * @see block_menu()
 */
function block_admin_display($theme) {
  return Drupal::entityManager()
    ->getListController('block')
    ->render($theme);
}

/**
 * Page callback: Build the block instance add form.
 *
 * @param string $plugin_id
 *   The plugin ID for the block instance.
 * @param string $theme
 *   The name of the theme for the block instance.
 *
 * @return array
 *   The block instance edit form.
 */
function block_admin_add($plugin_id, $theme) {
  $entity = entity_create('block', array(
    'plugin' => $plugin_id,
    'theme' => $theme,
  ));
  return entity_get_form($entity);
}

/**
 * Page callback: Build the block instance edit form.
 *
 * @param \Drupal\block\Plugin\Core\Entity\Block $entity
 *   The block instance.
 *
 * @return array
 *   The block instance edit form.
 */
function block_admin_edit(Block $entity) {
  // Get the theme for the page title.
  $admin_theme = config('system.theme')->get('admin');
  $themes = list_themes();
  $theme_key = $entity->get('theme');
  $theme = $themes[$theme_key];
  // Use meaningful titles for the main site and administrative themes.
  $theme_title = $theme->info['name'];
  if ($theme_key == config('system.theme')->get('default')) {
    $theme_title = t('!theme (default theme)', array('!theme' => $theme_title));
  }
  elseif ($admin_theme && $theme_key == $admin_theme) {
    $theme_title = t('!theme (administration theme)', array('!theme' => $theme_title));
  }

  // Get the block label for the page title.
  drupal_set_title(t("Configure %label block in %theme", array('%label' => $entity->label(), '%theme' => $theme_title)), PASS_THROUGH);

  return entity_get_form($entity);
}

/**
 * Prepares variables for block admin display form templates.
 *
 * Default template: block-admin-display-form.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - form: A render element representing the form.
 */
function template_preprocess_block_admin_display_form(&$variables) {
  $variables['block_regions'] = $variables['form']['block_regions']['#value'];
  if (isset($variables['block_regions'][BLOCK_REGION_NONE])) {
    $variables['block_regions'][BLOCK_REGION_NONE] = t('Disabled');
  }

  foreach ($variables['block_regions'] as $key => $value) {
    // Initialize an empty array for the region.
    $variables['block_listing'][$key] = array();
  }

  $default_attributes = new Attribute(array('class' => array('draggable')));
  $row = 0;

  // Initialize disabled blocks array.
  $variables['block_listing'][BLOCK_REGION_NONE] = array();

  // Add each block in the form to the appropriate place in the block listing.
  foreach (element_children($variables['form']['blocks']) as $i) {
    $block = &$variables['form']['blocks'][$i];

    // Fetch the region for the current block.
    $region = (isset($block['region']['#default_value']) ? $block['region']['#default_value'] : BLOCK_REGION_NONE);

    // Set special classes needed for table drag and drop.
    $block['region']['#attributes']['class'] = array('block-region-select', 'block-region-' . $region);
    $block['weight']['#attributes']['class'] = array('block-weight', 'block-weight-' . $region);

    $variables['block_listing'][$region][$i] = new stdClass();
    $variables['block_listing'][$region][$i]->attributes = clone $default_attributes;
    $variables['block_listing'][$region][$i]->attributes['class'][] = $row % 2 == 0 ? 'odd' : 'even';
    $row++;
    if(!empty($block['#attributes']['class'])) {
      $variables['block_listing'][$region][$i]->attributes['class'][] = implode(' ', $block['#attributes']['class']);
    }

    $variables['block_listing'][$region][$i]->row_class = !empty($block['#attributes']['class']) ? implode(' ', $block['#attributes']['class']) : '';
    $variables['block_listing'][$region][$i]->block_modified = !empty($block['#attributes']['class']) && in_array('block-modified', $block['#attributes']['class']);
    $variables['block_listing'][$region][$i]->block_title = $block['info'];
    $variables['block_listing'][$region][$i]->region_select = array(
      'region' => array(
        'data' => $block['region'],
        '#weight' => 1,
      ),
      'theme' => array(
        'data' => $block['theme'],
        '#weight' => 2,
      ),
    );
    $variables['block_listing'][$region][$i]->weight_select = $block['weight'];
    $variables['block_listing'][$region][$i]->operations = $block['operations'];
    $variables['block_listing'][$region][$i]->printed = FALSE;
  }
}