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<?php

namespace Drupal\image\Form;

use Drupal\Component\Utility\Unicode;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\image\ConfigurableImageEffectInterface;
use Drupal\image\ImageEffectManager;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Controller for image style edit form.
 *
 * @internal
 */
class ImageStyleEditForm extends ImageStyleFormBase {

  /**
   * The image effect manager service.
   *
   * @var \Drupal\image\ImageEffectManager
   */
  protected $imageEffectManager;

  /**
   * Constructs an ImageStyleEditForm object.
   *
   * @param \Drupal\Core\Entity\EntityStorageInterface $image_style_storage
   *   The storage.
   * @param \Drupal\image\ImageEffectManager $image_effect_manager
   *   The image effect manager service.
   */
  public function __construct(EntityStorageInterface $image_style_storage, ImageEffectManager $image_effect_manager) {
    parent::__construct($image_style_storage);
    $this->imageEffectManager = $image_effect_manager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('entity.manager')->getStorage('image_style'),
      $container->get('plugin.manager.image.effect')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function form(array $form, FormStateInterface $form_state) {
    $user_input = $form_state->getUserInput();
    $form['#title'] = $this->t('Edit style %name', ['%name' => $this->entity->label()]);
    $form['#tree'] = TRUE;
    $form['#attached']['library'][] = 'image/admin';

    // Show the thumbnail preview.
    $preview_arguments = ['#theme' => 'image_style_preview', '#style' => $this->entity];
    $form['preview'] = [
      '#type' => 'item',
      '#title' => $this->t('Preview'),
      '#markup' => \Drupal::service('renderer')->render($preview_arguments),
      // Render preview above parent elements.
      '#weight' => -5,
    ];

    // Build the list of existing image effects for this image style.
    $form['effects'] = [
      '#type' => 'table',
      '#header' => [
        $this->t('Effect'),
        $this->t('Weight'),
        $this->t('Operations'),
      ],
      '#tabledrag' => [
        [
          'action' => 'order',
          'relationship' => 'sibling',
          'group' => 'image-effect-order-weight',
        ],
      ],
      '#attributes' => [
        'id' => 'image-style-effects',
      ],
      '#empty' => t('There are currently no effects in this style. Add one by selecting an option below.'),
      // Render effects below parent elements.
      '#weight' => 5,
    ];
    foreach ($this->entity->getEffects() as $effect) {
      $key = $effect->getUuid();
      $form['effects'][$key]['#attributes']['class'][] = 'draggable';
      $form['effects'][$key]['#weight'] = isset($user_input['effects']) ? $user_input['effects'][$key]['weight'] : NULL;
      $form['effects'][$key]['effect'] = [
        '#tree' => FALSE,
        'data' => [
          'label' => [
            '#plain_text' => $effect->label(),
          ],
        ],
      ];

      $summary = $effect->getSummary();

      if (!empty($summary)) {
        $summary['#prefix'] = ' ';
        $form['effects'][$key]['effect']['data']['summary'] = $summary;
      }

      $form['effects'][$key]['weight'] = [
        '#type' => 'weight',
        '#title' => $this->t('Weight for @title', ['@title' => $effect->label()]),
        '#title_display' => 'invisible',
        '#default_value' => $effect->getWeight(),
        '#attributes' => [
          'class' => ['image-effect-order-weight'],
        ],
      ];

      $links = [];
      $is_configurable = $effect instanceof ConfigurableImageEffectInterface;
      if ($is_configurable) {
        $links['edit'] = [
          'title' => $this->t('Edit'),
          'url' => Url::fromRoute('image.effect_edit_form', [
            'image_style' => $this->entity->id(),
            'image_effect' => $key,
          ]),
        ];
      }
      $links['delete'] = [
        'title' => $this->t('Delete'),
        'url' => Url::fromRoute('image.effect_delete', [
          'image_style' => $this->entity->id(),
          'image_effect' => $key,
        ]),
      ];
      $form['effects'][$key]['operations'] = [
        '#type' => 'operations',
        '#links' => $links,
      ];
    }

    // Build the new image effect addition form and add it to the effect list.
    $new_effect_options = [];
    $effects = $this->imageEffectManager->getDefinitions();
    uasort($effects, function ($a, $b) {
      return Unicode::strcasecmp($a['label'], $b['label']);
    });
    foreach ($effects as $effect => $definition) {
      $new_effect_options[$effect] = $definition['label'];
    }
    $form['effects']['new'] = [
      '#tree' => FALSE,
      '#weight' => isset($user_input['weight']) ? $user_input['weight'] : NULL,
      '#attributes' => ['class' => ['draggable']],
    ];
    $form['effects']['new']['effect'] = [
      'data' => [
        'new' => [
          '#type' => 'select',
          '#title' => $this->t('Effect'),
          '#title_display' => 'invisible',
          '#options' => $new_effect_options,
          '#empty_option' => $this->t('Select a new effect'),
        ],
        [
          'add' => [
            '#type' => 'submit',
            '#value' => $this->t('Add'),
            '#validate' => ['::effectValidate'],
            '#submit' => ['::submitForm', '::effectSave'],
          ],
        ],
      ],
      '#prefix' => '<div class="image-style-new">',
      '#suffix' => '</div>',
    ];

    $form['effects']['new']['weight'] = [
      '#type' => 'weight',
      '#title' => $this->t('Weight for new effect'),
      '#title_display' => 'invisible',
      '#default_value' => count($this->entity->getEffects()) + 1,
      '#attributes' => ['class' => ['image-effect-order-weight']],
    ];
    $form['effects']['new']['operations'] = [
      'data' => [],
    ];

    return parent::form($form, $form_state);
  }

  /**
   * Validate handler for image effect.
   */
  public function effectValidate($form, FormStateInterface $form_state) {
    if (!$form_state->getValue('new')) {
      $form_state->setErrorByName('new', $this->t('Select an effect to add.'));
    }
  }

  /**
   * Submit handler for image effect.
   */
  public function effectSave($form, FormStateInterface $form_state) {
    $this->save($form, $form_state);

    // Check if this field has any configuration options.
    $effect = $this->imageEffectManager->getDefinition($form_state->getValue('new'));

    // Load the configuration form for this option.
    if (is_subclass_of($effect['class'], '\Drupal\image\ConfigurableImageEffectInterface')) {
      $form_state->setRedirect(
        'image.effect_add_form',
        [
          'image_style' => $this->entity->id(),
          'image_effect' => $form_state->getValue('new'),
        ],
        ['query' => ['weight' => $form_state->getValue('weight')]]
      );
    }
    // If there's no form, immediately add the image effect.
    else {
      $effect = [
        'id' => $effect['id'],
        'data' => [],
        'weight' => $form_state->getValue('weight'),
      ];
      $effect_id = $this->entity->addImageEffect($effect);
      $this->entity->save();
      if (!empty($effect_id)) {
        $this->messenger()->addStatus($this->t('The image effect was successfully applied.'));
      }
    }
  }

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

    // Update image effect weights.
    if (!$form_state->isValueEmpty('effects')) {
      $this->updateEffectWeights($form_state->getValue('effects'));
    }

    parent::submitForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    parent::save($form, $form_state);
    $this->messenger()->addStatus($this->t('Changes to the style have been saved.'));
  }

  /**
   * Updates image effect weights.
   *
   * @param array $effects
   *   Associative array with effects having effect uuid as keys and array
   *   with effect data as values.
   */
  protected function updateEffectWeights(array $effects) {
    foreach ($effects as $uuid => $effect_data) {
      if ($this->entity->getEffects()->has($uuid)) {
        $this->entity->getEffect($uuid)->setWeight($effect_data['weight']);
      }
    }
  }

}