<?php

namespace Drupal\og_sydneymetrod9\Form;

use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\HtmlCommand;
use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Form controller for Interactive Map Item edit forms.
 *
 * @ingroup og_sydneymetrod9
 */
class InteractiveMapItemEntityForm extends ContentEntityForm {

  /**
   * The current user account.
   *
   * @var \Drupal\Core\Session\AccountProxyInterface
   */
  protected $account;

  /**
   * The Interactive Map storage.
   *
   * @var \Drupal\Core\Entity\EntityStorageInterface
   */
  protected EntityStorageInterface $interactiveMapEntityStorage;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    // Instantiates this form class.
    $instance = parent::create($container);
    $instance->account = $container->get('current_user');
    $instance->interactiveMapEntityStorage = $container->get('entity_type.manager')->getStorage('interactive_map');
    return $instance;
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form = parent::buildForm($form, $form_state);

    if (!$this->entity->isNew()) {
      $form['new_revision'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Create new revision'),
        '#default_value' => FALSE,
        '#weight' => 10,
      ];
    }

    $form['map']['widget']['#ajax'] = [
      'event' => 'change',
      'callback' => '::getItemCategoryCallback',
      'wrapper' => 'item-category-field-wrapper',
    ];

//    $form_state->setCached(FALSE);
    $user_input = $form_state->getUserInput();
    $map_id = NULL;
    $item_category_options['_none'] = t('- None -');

    // If map is selected
    if (isset($user_input['_triggering_element_name'])) {
      if ($user_input['_triggering_element_name'] === 'map') {
        $field_map_id = $form_state->getValue('map');
        if (isset($field_map_id[0]['target_id'])) {
          $map_id = $field_map_id[0]['target_id'];
        }
      }
    }
    elseif (!empty($form['map']['widget']['#default_value'][0])) {
      // When map already there, meaning in edit mode
      $map_id = $form['map']['widget']['#default_value'][0];
    }
    elseif ($form_state->hasValue('map')) {
      $field_map_id = $form_state->getValue('map');
      if (isset($field_map_id[0]['target_id'])) {
        $map_id = $field_map_id[0]['target_id'];
      }
    }

    if ($map_id) {
      $map_vocab_id = $this->getMapVocabulary($map_id);
      $terms = $this->getTermData($map_vocab_id);
      $item_category_options = $item_category_options + $terms;
    }

    $form['item_category']['widget']['#prefix'] = '<div id="item-category-field-wrapper">';
    $form['item_category']['widget']['#suffix'] = '</div>';
    $form['item_category']['#attributes']['id'] = 'edit-item-category-abc';
    $form['item_category']['widget']['#attributes']['id'] = 'edit-item-category';
    $form['item_category']['widget']['#options'] = $item_category_options;
    $form['item_category']['widget']['#default_value'] = !empty($form_state->getValue('item_category')) ? $form_state->getValue('item_category') : '';

    return $form;
  }

  protected function getMapVocabulary(int $map_id): string {
    if (!is_int($map_id)) {
      return '';
    }

    $map = $this->interactiveMapEntityStorage->load($map_id);
    $map_vocab_id = NULL;
    if (!$map->get('field_map_vocabulary')->isEmpty()) {
      $field_map_vocabulary = $map->get('field_map_vocabulary')->getValue();
      if (isset($field_map_vocabulary[0]['target_id'])) {
        $map_vocab_id = $field_map_vocabulary[0]['target_id'];
      }
    }
    return $map_vocab_id;
  }

  protected function getTermData($vocabulary): array {
    $terms = NULL;
    try {
      // get terms of the vocabulary
      $terms = \Drupal::entityTypeManager()
        ->getStorage('taxonomy_term')
        ->loadTree($vocabulary);

    } catch (\Exception $e) {
      // log exception
      \Drupal::logger('og_sydneymetrod9')
        ->warning(t('Exception when getting list of terms in vocabulary @vocabulary. Message: @message', [
          '@vocabulary' => $vocabulary,
          '@message' => $e->getMessage(),
        ]));
    }

    $terms_array = [];
    foreach ($terms as $term) {
      $terms_array[$term->tid] = $term->name;
    }
    return $terms_array;
  }

  /**
   * Callback function to fetch list of terms based on Map's vocabulary.
   *
   * @param array $form
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *
   * @return mixed
   */
  public static function getItemCategoryCallback(array $form, FormStateInterface $form_state) {
    return $form['item_category'];
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    $entity = $this->entity;

    // Save as a new revision if requested to do so.
    if (!$form_state->isValueEmpty('new_revision') && $form_state->getValue('new_revision') != FALSE) {
      $entity->setNewRevision();

      // If a new revision is created, save the current user as revision author.
      $entity->setRevisionCreationTime($this->time->getRequestTime());
      $entity->setRevisionUserId($this->account->id());
    }
    else {
      $entity->setNewRevision(FALSE);
    }

    $status = parent::save($form, $form_state);

    switch ($status) {
      case SAVED_NEW:
        $this->messenger()->addMessage($this->t('Created the %label Interactive Map Item.', [
          '%label' => $entity->label(),
        ]));
        break;

      default:
        $this->messenger()->addMessage($this->t('Saved the %label Interactive Map Item.', [
          '%label' => $entity->label(),
        ]));
    }
    $form_state->setRedirect('entity.interactive_map_item.canonical', ['interactive_map_item' => $entity->id()]);
  }

}