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<?php

namespace Drupal\image\Plugin\ImageEffect;

use Drupal\Component\Utility\Color;
use Drupal\Component\Utility\Rectangle;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Image\ImageInterface;
use Drupal\image\ConfigurableImageEffectBase;

/**
 * Rotates an image resource.
 *
 * @ImageEffect(
 *   id = "image_rotate",
 *   label = @Translation("Rotate"),
 *   description = @Translation("Rotating an image may cause the dimensions of an image to increase to fit the diagonal.")
 * )
 */
class RotateImageEffect extends ConfigurableImageEffectBase {

  /**
   * {@inheritdoc}
   */
  public function applyEffect(ImageInterface $image) {
    if (!empty($this->configuration['random'])) {
      $degrees = abs((float) $this->configuration['degrees']);
      $this->configuration['degrees'] = rand(-$degrees, $degrees);
    }

    if (!$image->rotate($this->configuration['degrees'], $this->configuration['bgcolor'])) {
      $this->logger->error('Image rotate failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', ['%toolkit' => $image->getToolkitId(), '%path' => $image->getSource(), '%mimetype' => $image->getMimeType(), '%dimensions' => $image->getWidth() . 'x' . $image->getHeight()]);
      return FALSE;
    }
    return TRUE;
  }

  /**
   * {@inheritdoc}
   */
  public function transformDimensions(array &$dimensions, $uri) {
    // If the rotate is not random and current dimensions are set,
    // then the new dimensions can be determined.
    if (!$this->configuration['random'] && $dimensions['width'] && $dimensions['height']) {
      $rect = new Rectangle($dimensions['width'], $dimensions['height']);
      $rect = $rect->rotate($this->configuration['degrees']);
      $dimensions['width'] = $rect->getBoundingWidth();
      $dimensions['height'] = $rect->getBoundingHeight();
    }
    else {
      $dimensions['width'] = $dimensions['height'] = NULL;
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getSummary() {
    $summary = [
      '#theme' => 'image_rotate_summary',
      '#data' => $this->configuration,
    ];
    $summary += parent::getSummary();

    return $summary;
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'degrees' => 0,
      'bgcolor' => NULL,
      'random' => FALSE,
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form['degrees'] = [
      '#type' => 'number',
      '#default_value' => $this->configuration['degrees'],
      '#title' => t('Rotation angle'),
      '#description' => t('The number of degrees the image should be rotated. Positive numbers are clockwise, negative are counter-clockwise.'),
      '#field_suffix' => '°',
      '#required' => TRUE,
    ];
    $form['bgcolor'] = [
      '#type' => 'textfield',
      '#default_value' => $this->configuration['bgcolor'],
      '#title' => t('Background color'),
      '#description' => t('The background color to use for exposed areas of the image. Use web-style hex colors (#FFFFFF for white, #000000 for black). Leave blank for transparency on image types that support it.'),
      '#size' => 7,
      '#maxlength' => 7,
    ];
    $form['random'] = [
      '#type' => 'checkbox',
      '#default_value' => $this->configuration['random'],
      '#title' => t('Randomize'),
      '#description' => t('Randomize the rotation angle for each image. The angle specified above is used as a maximum.'),
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
    if (!$form_state->isValueEmpty('bgcolor') && !Color::validateHex($form_state->getValue('bgcolor'))) {
      $form_state->setErrorByName('bgcolor', $this->t('Background color must be a hexadecimal color value.'));
    }
  }

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    parent::submitConfigurationForm($form, $form_state);

    $this->configuration['degrees'] = $form_state->getValue('degrees');
    $this->configuration['bgcolor'] = $form_state->getValue('bgcolor');
    $this->configuration['random'] = $form_state->getValue('random');
  }

}