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<?php

namespace Drupal\layout_builder\Plugin\Layout;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Layout\LayoutDefault;
use Drupal\Core\Plugin\PluginFormInterface;

/**
 * Base class of layouts with configurable widths.
 *
 * @internal
 *   Plugin classes are internal.
 */
abstract class MultiWidthLayoutBase extends LayoutDefault implements PluginFormInterface {

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    $width_classes = array_keys($this->getWidthOptions());
    return [
      'column_widths' => array_shift($width_classes),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form['column_widths'] = [
      '#type' => 'select',
      '#title' => $this->t('Column widths'),
      '#default_value' => $this->configuration['column_widths'],
      '#options' => $this->getWidthOptions(),
      '#description' => $this->t('Choose the column widths for this layout.'),
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
  }

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    $this->configuration['column_widths'] = $form_state->getValue('column_widths');
  }

  /**
   * {@inheritdoc}
   */
  public function build(array $regions) {
    $build = parent::build($regions);
    $build['#attributes']['class'] = [
      'layout',
      $this->getPluginDefinition()->getTemplate(),
      $this->getPluginDefinition()->getTemplate() . '--' . $this->configuration['column_widths'],
    ];
    return $build;
  }

  /**
   * Gets the width options for the configuration form.
   *
   * The first option will be used as the default 'column_widths' configuration
   * value.
   *
   * @return string[]
   *   The width options array where the keys are strings that will be added to
   *   the CSS classes and the values are the human readable labels.
   */
  abstract protected function getWidthOptions();

}