<?php

/**
 * @file
 * Allows the creaation of custom blocks through the user interface.
 */

use Drupal\custom_block\Plugin\Core\Entity\CustomBlockType;
use Drupal\custom_block\Plugin\Core\Entity\CustomBlock;
use Drupal\custom_block\Plugin\block\block\CustomBlockBlock;
use Drupal\block\Plugin\Core\Entity\Block;

/**
 * Implements hook_menu_local_tasks().
 */
function custom_block_menu_local_tasks(&$data, $router_item, $root_path) {
  // Add the "Add custom block" action link to the theme-specific block library
  // listing page.
  // @todo This should just be $root_path == 'admin/structure/block/list/%/add'
  //   but block_menu() registers static router paths instead of dynamic ones.
  if (preg_match('@^admin/structure/block/list/(.*)/add$@', $root_path)) {
    $item = menu_get_item('block/add');
    if ($item['access']) {
      $data['actions']['block/add'] = array(
        '#theme' => 'menu_local_action',
        '#link' => $item,
      );
    }
  }
}

/**
 * Implements hook_menu().
 */
function custom_block_menu() {
  $items['admin/structure/custom-blocks'] = array(
    'title' => 'Custom block types',
    'description' => 'Manage custom block types.',
    'page callback' => 'custom_block_type_list',
    'access arguments' => array('administer blocks'),
    'file' => 'custom_block.admin.inc',
  );
  $items['admin/structure/custom-blocks/add'] = array(
    'title' => 'Add custom block type',
    'page callback' => 'custom_block_type_add',
    'access arguments' => array('administer blocks'),
    'type' => MENU_LOCAL_ACTION,
    'weight' => 1,
    'file' => 'custom_block.admin.inc',
  );
  $items['admin/structure/custom-blocks/manage/%custom_block_type'] = array(
    'title' => 'Edit custom block type',
    'title callback' => 'entity_page_label',
    'title arguments' => array(4),
    'page callback' => 'custom_block_type_edit',
    'page arguments' => array(4),
    'access arguments' => array('administer blocks'),
    'file' => 'custom_block.admin.inc',
  );
  $items['admin/structure/custom-blocks/manage/%custom_block_type/edit'] = array(
    'title' => 'Edit',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
  );
  $items['admin/structure/custom-blocks/manage/%custom_block_type/delete'] = array(
    'title' => 'Delete',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('custom_block_type_delete_form', 4),
    'access arguments' => array('administer blocks'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 10,
    'file' => 'custom_block.admin.inc',
  );

  $items['block/add'] = array(
    'title' => 'Add custom block',
    'route_name' => 'custom_block_add_page',
  );
  $items['block/add/%custom_block_type'] = array(
    'title callback' => 'entity_page_label',
    'title arguments' => array(2),
    'page callback' => 'custom_block_add',
    'page arguments' => array(2),
    'access arguments' => array('administer blocks'),
    'description' => 'Add custom block',
    'file' => 'custom_block.pages.inc',
  );
  // There has to be a base-item in order for contextual links to work.
  $items['block/%custom_block'] = array(
    'title' => 'Edit',
    'page callback' => 'custom_block_edit',
    'page arguments' => array(1),
    'access callback' => 'entity_page_access',
    'access arguments' => array(1, 'update'),
    'file' => 'custom_block.pages.inc',
  );
  $items['block/%custom_block/edit'] = array(
    'title' => 'Edit',
    'weight' => 0,
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
  );
  $items['block/%custom_block/delete'] = array(
    'title' => 'Delete',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('custom_block_delete_form', 1),
    'access callback' => 'entity_page_access',
    'access arguments' => array(1, 'delete'),
    'weight' => 1,
    'type' => MENU_LOCAL_TASK,
    'context' => MENU_CONTEXT_INLINE,
    'file' => 'custom_block.pages.inc',
  );
  return $items;
}

/**
 * Implements hook_theme().
 */
function custom_block_theme($existing, $type, $theme, $path) {
  return array(
    'custom_block_block' => array(
      'variables' => array('body' => NULL, 'format' => NULL),
    ),
    'custom_block_add_list' => array(
      'variables' => array('content' => NULL),
      'file' => 'custom_block.pages.inc',
    ),
  );
}

/**
 * Returns HTML for a custom block.
 *
 * @ingroup themeable
 */
function theme_custom_block_block($variables) {
  $body = $variables['body'];
  $format = $variables['format'];

  return check_markup($body, $format);
}

/**
 * Loads a custom block type.
 *
 * @param int $id
 *   The ID of the custom block type to load.
 *
 * @return Drupal\custom_block\Plugin\Core\Entity\CustomBlockType|false
 *   A CustomBlockType object or FALSE if the requested $id does not exist.
 */
function custom_block_type_load($id) {
  return entity_load('custom_block_type', $id);
}

/**
 * Loads a custom block.
 *
 * @param int $id
 *   The id of the custom block.
 *
 * @return Drupal\custom_block\Plugin\Core\Entity\CustomBlock|false
 *   A CustomBlock object or FALSE if the requested $id does not exist.
 */
function custom_block_load($id) {
  return entity_load('custom_block', $id);
}

/**
 * Implements hook_entity_info_alter().
 */
function custom_block_entity_info_alter(&$types) {
  // Add a translation handler for fields if the language module is enabled.
  if (module_exists('language')) {
    $types['custom_block']['translation']['custom_block'] = TRUE;
  }
}

/**
 * Implements hook_entity_bundle_info().
 */
function custom_block_entity_bundle_info() {
  $bundles = array();
  foreach (config_get_storage_names_with_prefix('custom_block.type.') as $config_name) {
    $config = config($config_name);
    $bundles['custom_block'][$config->get('id')]['label'] = $config->get('label');
  }
  return $bundles;
}

/**
 * Implements hook_entity_view_mode_info().
 */
function custom_block_entity_view_mode_info() {
  $view_modes['custom_block']['full'] = array(
    'label' => t('Full'),
  );
  return $view_modes;
}

/**
 * Adds the default body field to a custom block type.
 *
 * @param string $block_type_id
 *   Id of the block type.
 * @param string $label
 *   (optional) The label for the body instance. Defaults to 'Block body'
 *
 * @return array()
 *   Body field instance.
 */
function custom_block_add_body_field($block_type_id, $label = 'Block body') {
  // Add or remove the body field, as needed.
  $field = field_info_field('block_body');
  $instance = field_info_instance('custom_block', 'block_body', $block_type_id);
  if (empty($field)) {
    $field = array(
      'field_name' => 'block_body',
      'type' => 'text_with_summary',
      'entity_types' => array('custom_block'),
    );
    $field = field_create_field($field);
  }
  if (empty($instance)) {
    $instance = array(
      'field_name' => 'block_body',
      'entity_type' => 'custom_block',
      'bundle' => $block_type_id,
      'label' => $label,
      'widget' => array('type' => 'text_textarea_with_summary'),
      'settings' => array('display_summary' => FALSE),
    );
    $instance = field_create_instance($instance);

    // Assign display settings for 'default' view mode.
    entity_get_display('custom_block', $block_type_id, 'default')
      ->setComponent('block_body', array(
        'label' => 'hidden',
        'type' => 'text_default',
      ))
      ->save();
  }

  return $instance;
}

/**
 * Implements hook_form_FORM_ID_alter() for block_plugin_ui().
 */
function custom_block_form_block_plugin_ui_alter(&$form, $form_state) {
  foreach ($form['left']['plugin_library']['#rows'] as $plugin_id => &$row) {
    // @todo Clean up when http://drupal.org/node/1874498 lands.
    if (strpos($plugin_id, ':') === FALSE) {
      continue;
    }
    list($base, $derivative) = explode(':', $plugin_id);
    if ($base !== 'custom_block') {
      continue;
    }
    $custom_block = entity_load_by_uuid('custom_block', $derivative);
    $row['1']['data']['#links']['edit'] = array(
      'title' => t('Edit'),
      'href' => 'block/' . $custom_block->id() . '/edit'
    );
  }
}

/**
 * Implements hook_admin_paths().
 */
function custom_block_admin_paths() {
  $paths = array(
    'block/add' => TRUE,
    'block/add/*' => TRUE,
    'block/*/edit' => TRUE,
    'block/*/delete' => TRUE,
    'admin/structure/custom-blocks/*' => TRUE,
  );
  return $paths;
}