class TestToolkit

class TestToolkit extends ImageToolkitBase {
    
    /**
     * The state service.
     *
     * @var \Drupal\Core\State\StateInterface
     */
    protected $state;
    
    /**
     * Image type represented by a PHP IMAGETYPE_* constant (e.g. IMAGETYPE_JPEG).
     *
     * @var int
     */
    protected $type;
    
    /**
     * The width of the image.
     *
     * @var int
     */
    protected $width;
    
    /**
     * The height of the image.
     *
     * @var int
     */
    protected $height;
    
    /**
     * Constructs a TestToolkit object.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param array $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\ImageToolkit\ImageToolkitOperationManagerInterface $operation_manager
     *   The toolkit operation manager.
     * @param \Psr\Log\LoggerInterface $logger
     *   A logger instance.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The config factory.
     * @param \Drupal\Core\State\StateInterface $state
     *   The state key value store.
     */
    public function __construct(array $configuration, $plugin_id, array $plugin_definition, ImageToolkitOperationManagerInterface $operation_manager, LoggerInterface $logger, ConfigFactoryInterface $config_factory, StateInterface $state) {
        parent::__construct($configuration, $plugin_id, $plugin_definition, $operation_manager, $logger, $config_factory);
        $this->state = $state;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('image.toolkit.operation.manager'), $container->get('logger.channel.image'), $container->get('config.factory'), $container->get('state'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
        $this->logCall('settings', func_get_args());
        $form['test_parameter'] = [
            '#type' => 'number',
            '#title' => $this->t('Test toolkit parameter'),
            '#description' => $this->t('A toolkit parameter for testing purposes.'),
            '#min' => 0,
            '#max' => 100,
            '#default_value' => $this->configFactory
                ->getEditable('system.image.test_toolkit')
                ->get('test_parameter', FALSE),
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
        if ($form_state->getValue([
            'test',
            'test_parameter',
        ]) == 0) {
            $form_state->setErrorByName('test][test_parameter', $this->t('Test parameter should be different from 0.'));
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
        $this->configFactory
            ->getEditable('system.image.test_toolkit')
            ->set('test_parameter', $form_state->getValue([
            'test',
            'test_parameter',
        ]))
            ->save();
    }
    
    /**
     * {@inheritdoc}
     */
    public function isValid() {
        return isset($this->type);
    }
    
    /**
     * {@inheritdoc}
     */
    public function parseFile() {
        $this->logCall('parseFile', func_get_args());
        $data = @getimagesize($this->getSource());
        if ($data && in_array($data[2], static::supportedTypes())) {
            $this->setType($data[2]);
            $this->width = $data[0];
            $this->height = $data[1];
            return TRUE;
        }
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function save($destination) {
        $this->logCall('save', func_get_args());
        // Return false so that image_save() doesn't try to chmod the destination
        // file that we didn't bother to create.
        return FALSE;
    }
    
    /**
     * Stores the values passed to a toolkit call.
     *
     * @param string $op
     *   One of the toolkit methods 'parseFile', 'save', 'settings', or 'apply'.
     * @param array $args
     *   Values passed to hook.
     *
     * @see \Drupal\Tests\system\Functional\Image\ToolkitTestBase::imageTestReset()
     * @see \Drupal\Tests\system\Functional\Image\ToolkitTestBase::imageTestGetAllCalls()
     */
    protected function logCall($op, $args) {
        $results = $this->state
            ->get('image_test.results', []);
        $results[$op][] = $args;
        // A call to apply is also logged under its operation name whereby the
        // array of arguments are logged as separate arguments, this because at the
        // ImageInterface level we still have methods named after the operations.
        if ($op === 'apply') {
            $operation = array_shift($args);
            $results[$operation][] = array_values(reset($args));
        }
        $this->state
            ->set('image_test.results', $results);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getWidth() {
        return $this->width;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getHeight() {
        return $this->height;
    }
    
    /**
     * Returns the type of the image.
     *
     * @return int
     *   The image type represented by a PHP IMAGETYPE_* constant (e.g.
     *   IMAGETYPE_JPEG).
     */
    public function getType() {
        return $this->type;
    }
    
    /**
     * Sets the PHP type of the image.
     *
     * @param int $type
     *   The image type represented by a PHP IMAGETYPE_* constant (e.g.
     *   IMAGETYPE_JPEG).
     *
     * @return $this
     */
    public function setType($type) {
        if (in_array($type, static::supportedTypes())) {
            $this->type = $type;
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getMimeType() {
        return $this->getType() ? image_type_to_mime_type($this->getType()) : '';
    }
    
    /**
     * {@inheritdoc}
     */
    public static function isAvailable() {
        return TRUE;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSupportedExtensions() {
        $extensions = [];
        foreach (static::supportedTypes() as $image_type) {
            $extensions[] = mb_strtolower(image_type_to_extension($image_type, FALSE));
        }
        return $extensions;
    }
    
    /**
     * Returns a list of image types supported by the toolkit.
     *
     * @return array
     *   An array of available image types. An image type is represented by a PHP
     *   IMAGETYPE_* constant (e.g. IMAGETYPE_JPEG, IMAGETYPE_PNG, etc.).
     */
    protected static function supportedTypes() {
        return [
            IMAGETYPE_PNG,
            IMAGETYPE_JPEG,
            IMAGETYPE_GIF,
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function apply($operation, array $arguments = []) {
        $this->logCall('apply', func_get_args());
        return TRUE;
    }

}