<?php

use Drupal\Component\Render\MarkupInterface;
use Drupal\Component\Render\MarkupTrait;
use Drupal\Core\Render\Markup;
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_theme().
 */
function custom_forms_default_fields_theme() {
  return [
    'custom_forms_image_upload' => [
      'base hook' => 'file_managed_file'
    ],
    'form_element__amount_value' => [
      'base hook' => 'form_element'
    ],
    'form_element__plain_text' => [
      'base hook' => 'form_element'
    ],
    'form_element__text_format' => [
      'base hook' => 'form_element'
    ],
    'form_element__number' => [
      'base hook' => 'form_element'
    ],
    'form_element__email' => [
      'base hook' => 'form_element'
    ],
  ];
}

/**
 * Implements hook_help().
 */
function custom_forms_default_fields_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.custom_forms_default_fields':
      return 'Adds some default fields which will then be available to be added to custom forms.';
  }
}

/**
 * Implements hook_locale_translation_projects_alter().
 */
function custom_forms_default_fields_locale_translation_projects_alter(&$projects) {
  $module_handler = \Drupal::service('module_handler');
  $path = $module_handler->getModule('custom_forms_default_fields')->getPath();
  $projects['custom_forms_default_fields']['info']['interface translation server pattern'] = $path.'/translations/%language.po';
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function custom_forms_default_fields_form_custom_forms_settings_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  // We add an option for choosing which image styles should be available for the image upload field.
  $form['image_upload'] = [
    '#type' => 'details',
    '#open' => FALSE,
    '#title' => t('Image upload settings'),
  ];

  $config = \Drupal::config('custom_forms_default_fields.settings');
  $image_upload_config = $config->get('image_upload');

  $image_style_entities = \Drupal::entityTypeManager()->getStorage('image_style')->loadMultiple();
  $image_styles = [];
  foreach ($image_style_entities as $image_style) {
    $image_styles[$image_style->id()] = $image_style->label();
  }

  $form['image_upload']['image_upload_enabled_styles'] = [
    '#type' => 'checkboxes',
    '#title' => t('Enabled image styles'),
    '#options' => $image_styles
  ];

  if (!empty($image_upload_config['enabled_styles'])) {
    $form['image_upload']['image_upload_enabled_styles']['#default_value'] = $image_upload_config['enabled_styles'];
  }

  // Add custom submit handler so we can save our settings.
  $form['#submit'][] = '__default_fields_settings_submission_handler';
}

/**
 * Implements hook_preprocess_HOOK().
 */
function custom_forms_default_fields_preprocess_custom_forms_image_upload(&$variables) {
  $element = $variables['element'];

  $variables['attributes']['class'][] = 'image-upload';
  $variables['attributes']['class'][] = 'js-image-upload';

  $enable_preview = TRUE;
  // check if we are using a private filepath.
  if (strpos($element['#upload_location'], 'private://') === 0) {
    // Private file storage does not support image styles.
    $enable_preview = FALSE;
  }

  if (!empty($element['fids']['#value'])) {
    /** @var \Drupal\file\Entity\File $file */
    $file = reset($element['#files']);
    if ($enable_preview && !empty($element['#preview_image_style'])) {
      // Hide the filename if it's defined.
      if (isset($element['file_' . $file->id()]['filename'])) {
        $variables['element']['file_' . $file->id()]['filename']['#attributes']['class'][] = 'visually-hidden';
      }
      // Show the preview of the uploaded image.
      $variables['element']['file_' . $file->id()]['thumbnail'] = array(
        '#theme' => 'image_style',
        '#style_name' => $element['#preview_image_style'],
        '#uri' => $file->getFileUri()
      );
    } else {
      // If preview is not enabled, just show the filename.
      $variables['element']['file_' . $file->id()]['filename'] = [
        '#type' => 'html_tag',
        '#tag' => 'span',
        '#attributes' => [
          'class' => [
            'file-name',
          ],
        ],
        '#value' => $file->getFilename(),
        '#weight' => -10,
      ];
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function custom_forms_default_fields_form_custom_form_fields_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
  $form['#attached']['library'][] = 'custom_forms_default_fields/admin-field-styling';
}

function __default_fields_settings_submission_handler(array $form, \Drupal\Core\Form\FormStateInterface $form_state) {
  /** @var \Drupal\Core\Config\Config $config */
  $config = \Drupal::service('config.factory')->getEditable('custom_forms_default_fields.settings');
  $values = $form_state->cleanValues()->getValues();

  if (!empty($values['image_upload_enabled_styles'])) {
    $image_upload_config = [
      'enabled_styles' => $values['image_upload_enabled_styles'],
    ];
    $config->set('image_upload', $image_upload_config);
    $config->save();
  }
}