<?php
# @Author: Bachir Soussi Chiadmi <bach>
# @Date:   13-12-2017
# @Email:  bachir@figureslibres.io
# @Filename: edlp_productions.module
# @Last modified by:   bach
# @Last modified time: 20-12-2017
# @License: GPL-V3

use Drupal\Core\Menu\MenuTreeParameters;
use Drupal\menu_link_content\Entity\MenuLinkContent;


/**
 * Implements hook_theme().
 */
function edlp_productions_theme($existing, $type, $theme, $path) {
  // @see https://www.drupal.org/docs/8/theming/twig/create-custom-twig-templates-from-custom-module
  return array(
    'edlp_productions' => array(
      'file' => 'includes/edlp_productions.inc',
      'variables' => array(
        'nodes_entities' => NULL,
      ),
    ),
  );
}

/**
* hook_entity_extra_field_info()
*
*/
function edlp_productions_entity_extra_field_info(){
  $extra = [];
  $extra['node']['page']['display']['production_parent'] = [
    'label' => t('Production Parent'),
    'description' => 'display production menu parent from current node',
    'weight' => 99,
    'visible' => FALSE,
  ];
  $extra['node']['page']['display']['production_subtree'] = [
    'label' => t('Production Subtree'),
    'description' => 'display production menu subtree from current node',
    'weight' => 99,
    'visible' => FALSE,
  ];
  return $extra;
}


/**
 * Implements hook_ENTITY_TYPE_view().
 * @see https://www.amazeelabs.com/en/render-menu-tree-custom-code-drupal-8
 */
function edlp_productions_node_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode) {
  $parent_display_settings = $display->getComponent('production_parent');
  $subtree_display_settings = $display->getComponent('production_subtree');
  if (!empty($parent_display_settings) || !empty($subtree_display_settings)) {
    $menu_name = 'productions';
    // Find the menu item corresponding to the entity (node).
    $menu_link_service = \Drupal::getContainer()->get('plugin.manager.menu.link');
    $route_params = array('node' => $entity->id());
    $menu_links = $menu_link_service->loadLinksByRoute('entity.node.canonical', $route_params, $menu_name);
    if (!empty($menu_links)) {
      // We found a menu link
      $root_menu_item = reset($menu_links);
      $menu_tree_service = \Drupal::service('menu.link_tree');

      // parent
      if(!empty($parent_display_settings)){
        $parents_ids = $menu_link_service->getParentIds($root_menu_item->getPluginId());
        if(count($parents_ids) > 1){
          // dpm($parents_ids);
          $root_parent_menu_item_id = array_pop($parents_ids);
          $menu_parameters = new \Drupal\Core\Menu\MenuTreeParameters();
          $menu_parameters->setMaxDepth(0);
          $menu_parameters->setRoot($root_parent_menu_item_id);
          // Get the tree.
          $tree = $menu_tree_service->load($menu_name, $menu_parameters);
          // Apply some manipulators (checking the access, sorting).
          $manipulators = [
            ['callable' => 'menu.default_tree_manipulators:checkNodeAccess'],
            ['callable' => 'menu.default_tree_manipulators:checkAccess'],
            ['callable' => 'menu.default_tree_manipulators:generateIndexAndSort'],
          ];
          $tree = $menu_tree_service->transform($tree, $manipulators);
          // And the last step is to actually build the tree.
          $build['production_parent'] = array(
            '#type'=>"container",
            '#attributes'=>array(
              'class'=>'productions-parent'
            ),
            'menu'=>$menu_tree_service->build($tree)
          );
        }
      }

      // subtree
      if(!empty($subtree_display_settings)){
        // so we can continue with generating the tree.
        // First, setup the parameters: we need one level starting with the menu
        // link we found, but excluding it from the tree.
        $menu_parameters = new \Drupal\Core\Menu\MenuTreeParameters();
        $menu_parameters->setMaxDepth(1);
        $menu_parameters->setRoot($root_menu_item->getPluginId());
        $menu_parameters->excludeRoot();
        // Get the tree.
        $tree = $menu_tree_service->load($menu_name, $menu_parameters);
        // Apply some manipulators (checking the access, sorting).
        $manipulators = [
          ['callable' => 'menu.default_tree_manipulators:checkNodeAccess'],
          ['callable' => 'menu.default_tree_manipulators:checkAccess'],
          ['callable' => 'menu.default_tree_manipulators:generateIndexAndSort'],
        ];
        $tree = $menu_tree_service->transform($tree, $manipulators);
        // And the last step is to actually build the tree.
        $build['production_subtree'] = array(
          '#type'=>"container",
          '#attributes'=>array(
            'class'=>'productions-subtree'
          ),
          'menu'=>$menu_tree_service->build($tree)
        );
      }
    }
  }
}