<?php

/**
 * @file
 * Profile module file.
 */

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\node\Entity\Node;

/**
 * Implements hook_form_FORM_ID_alter().
 */
function uw_ct_profile_form_node_uw_ct_profile_form_alter(&$form, FormStateInterface $form_state, $form_id): void {
  $form['field_uw_ct_profile_contact']['widget'][0]['target_id']['#ajax'] = [
    'callback' => '_uw_ct_profile_node_form_callback',
    'event' => 'change',
    'wrapper' => $form['#id'],
  ];

  if ($form['field_uw_ct_profile_contact']['widget'][0]['target_id']) {
    foreach (_uw_ct_profile_alter_fields() as $profile_field => $contact_field) {
      $form[$profile_field]['widget'][0]['value']['#attributes']['readonly'] = 'readonly';
    }
  }
}

/**
 * Implements hook_form_FORM_ID_EDIT_FORM_alter().
 */
function uw_ct_profile_form_node_uw_ct_profile_edit_form_alter(&$form, FormStateInterface $form_state, $form_id): void {
  uw_ct_profile_form_node_uw_ct_profile_form_alter($form, $form_state, $form_id);
}

/**
 * Ajax call back function used in form alter.
 */
function _uw_ct_profile_node_form_callback(array &$form, FormStateInterface $form_state): array {
  $contact_nid = $form_state->getValue('field_uw_ct_profile_contact')[0]['target_id'];

  foreach (_uw_ct_profile_alter_fields() as $profile_field => $contact_field) {
    if ($contact_nid && is_numeric($contact_nid) && $contact = Node::load($contact_nid)) {
      // Copy value from the contact associated with this profile node.
      $form[$profile_field]['widget'][0]['value']['#value'] = $contact->$contact_field->value;
      // Set read only flag. Can't use #disabled (#states) since disabled fields
      // are not sent with submit (omitted). Validation will fail on req fields.
      $form[$profile_field]['widget'][0]['value']['#attributes']['readonly'] = 'readonly';
    }
    else {
      // Clear the read only flag, allow field to be edited.
      unset($form[$profile_field]['widget'][0]['value']['#attributes']['readonly']);
    }
  }

  return $form;
}

/**
 * Fields to sync.
 *
 * @return string[]
 *   Mapping of fields profile => contact.
 */
function _uw_ct_profile_alter_fields(): array {
  return [
    'title' => 'title',
    'field_uw_ct_profile_sort_name' => 'field_uw_ct_contact_sort_name',
    'field_uw_ct_profile_affiliation' => 'field_uw_ct_contact_affiliation',
    'field_uw_ct_profile_title' => 'field_uw_ct_contact_title',
  ];
}

/**
 * Implements hook_entity_presave().
 */
function uw_ct_profile_entity_presave(EntityInterface $entity) {

  // Sync image only for profile entity, only when entity is created, there is
  // contact link provided, and image field is empty.
  if ($entity->bundle() === 'uw_ct_profile' &&
    $entity->isNew() &&
    $entity->field_uw_ct_profile_contact->entity &&
    !$entity->field_uw_ct_profile_image->value
  ) {
    // Get contact entity from Link with contact field.
    $contact = $entity->field_uw_ct_profile_contact->entity;
    // If contact has attached image.
    if ($image = $contact->field_uw_ct_contact_image->entity) {
      // Update image field of profile with values from contact.
      $entity->field_uw_ct_profile_image->target_id = $image->id();
    }
  }
}