<?php

namespace Drupal\webform\Plugin\WebformElement;

use Drupal\Core\Form\FormStateInterface;
use Drupal\webform\Element\WebformHtmlEditor;
use Drupal\webform\Plugin\WebformElementBase;
use Drupal\webform\WebformSubmissionInterface;

/**
 * Provides a 'color' element.
 *
 * @WebformElement(
 *   id = "color",
 *   api = "https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!Element!Color.php/class/Color",
 *   label = @Translation("Color"),
 *   description = @Translation("Provides a form element for choosing a color."),
 *   category = @Translation("Advanced elements"),
 * )
 */
class Color extends WebformElementBase {

  /**
   * {@inheritdoc}
   */
  protected function defineDefaultProperties() {
    $properties = [
      // Color settings.
      'color_size' => 'medium',
    ] + parent::defineDefaultProperties();
    unset(
      $properties['format_items'],
      $properties['format_items_html'],
      $properties['format_items_text']
    );
    return $properties;
  }

  /* ************************************************************************ */

  /**
   * {@inheritdoc}
   */
  public function prepare(array &$element, WebformSubmissionInterface $webform_submission = NULL) {
    parent::prepare($element, $webform_submission);

    // Set the color swatches size.
    $color_size = $element['#color_size'] ?? 'medium';
    $element['#attributes']['class'][] = 'form-color-' . $color_size;

    // Add helpful attributes to better support older browsers.
    // @see http://www.wufoo.com/html5/types/6-color.html
    $element['#attributes'] += [
      'title' => $this->t('Hexadecimal color'),
      'pattern' => '#[a-f0-9]{6}',
      'placeholder' => '#000000',
    ];

    $element['#attached']['library'][] = 'webform/webform.element.color';
  }

  /**
   * {@inheritdoc}
   */
  protected function formatHtmlItem(array $element, WebformSubmissionInterface $webform_submission, array $options = []) {
    $value = $this->getValue($element, $webform_submission, $options);

    if (empty($value)) {
      return '';
    }

    $format = $this->getItemFormat($element);
    switch ($format) {
      case 'swatch':
        if (!in_array('font', WebformHtmlEditor::getAllowedTags())) {
          return $value;
        }
        else {
          return [
            '#type' => 'inline_template',
            '#template' => '<font color="{{ value }}">█</font> {{ value }}',
            '#context' => ['value' => $value],
          ];
        }

      default:
        return parent::formatHtmlItem($element, $webform_submission, $options);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getItemDefaultFormat() {
    return 'swatch';
  }

  /**
   * {@inheritdoc}
   */
  public function getItemFormats() {
    return parent::getItemFormats() + [
      'swatch' => $this->t('Color swatch'),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function form(array $form, FormStateInterface $form_state) {
    $form = parent::form($form, $form_state);
    $form['color'] = [
      '#type' => 'fieldset',
      '#title' => $this->t('Color settings'),
    ];
    $form['color']['color_size'] = [
      '#type' => 'select',
      '#title' => $this->t('Color swatch size'),
      '#options' => [
        'small' => $this->t('Small (@size)', ['@size' => '16px']),
        'medium' => $this->t('Medium (@size)', ['@size' => '24px']),
        'large' => $this->t('Large (@size)', ['@size' => '32px']),
      ],
      '#required' => TRUE,
    ];
    return $form;
  }

}
