class TipPluginBase

abstract class TipPluginBase extends PluginBase implements TipPluginInterface {
    
    /**
     * The label which is used for render of this tip.
     *
     * @var string
     */
    protected $label;
    
    /**
     * Allows tips to take more priority that others.
     *
     * @var string
     */
    protected $weight;
    
    /**
     * The attributes that will be applied to the markup of this tip.
     *
     * @var array
     *
     * @deprecated in drupal:9.2.0 and is removed from drupal:10.0.0. There is no
     *   direct replacement. Note that this was never actually used.
     *
     * @see https://www.drupal.org/node/3204096
     */
    protected $attributes;
    
    /**
     * {@inheritdoc}
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        if (!$this instanceof TourTipPluginInterface) {
            @trigger_error('Implementing ' . __NAMESPACE__ . '\\TipPluginInterface without also implementing ' . __NAMESPACE__ . '\\TourTipPluginInterface is deprecated in drupal:9.2.0. See https://www.drupal.org/node/3204096', E_USER_DEPRECATED);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function id() {
        return $this->get('id');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLabel() {
        return $this->get('label');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getWeight() {
        return $this->get('weight');
    }
    
    /**
     * {@inheritdoc}
     *
     * @todo remove in https://drupal.org/node/3195193
     */
    public function getAttributes() {
        // This method is deprecated and rewritten to be as backwards compatible as
        // possible with pre-existing uses. Due to the flexibility of tip plugins,
        // this backwards compatibility can't be fully guaranteed. Because of this,
        // we trigger a warning to caution the use of this function. This warning
        // does not stop page execution, but will be logged.
        trigger_error(__NAMESPACE__ . '\\TipPluginInterface::getAttributes is deprecated. Tour tip plugins should implement ' . __NAMESPACE__ . '\\TourTipPluginInterface and Tour configs should use the \'selector\' property instead of \'attributes\' to target an element.', E_USER_WARNING);
        // The _tour_update_joyride() updates the deprecated 'attributes' property
        // to the current 'selector' property. It's possible that additional
        // attributes not supported by Drupal core exist and these need to merged
        // in.
        $attributes = $this->get('attributes') ?: [];
        // Convert the selector property to the expected structure.
        $selector = $this->get('selector');
        $first_char = substr($selector, 0, 1);
        if ($first_char === '#') {
            $attributes['data-id'] = substr($selector, 1);
        }
        elseif ($first_char === '.') {
            $attributes['data-class'] = substr($selector, 1);
        }
        return $attributes;
    }
    
    /**
     * {@inheritdoc}
     */
    public function get($key) {
        if (!empty($this->configuration[$key])) {
            return $this->configuration[$key];
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function set($key, $value) {
        $this->configuration[$key] = $value;
    }
    
    /**
     * This method should not be used. It is deprecated from TipPluginInterface.
     *
     * @return array
     *   An intentionally empty array.
     *
     * @todo remove in https://drupal.org/node/3195193
     */
    public function getOutput() {
        // The getOutput() method was a requirement of TipPluginInterface, but was
        // not part of TipPluginBase prior to it being deprecated. As a result, all
        // tip plugins have their own implementations of getOutput() making it
        // unlikely that this implementation will be called. If it does get called,
        // however, the tour tip will have no content due to this method returning
        // an empty array. To help tour tips from unexpectedly having no content, a
        // warning is triggered. This warning does not stop page
        // execution, but will be logged.
        trigger_error(__NAMESPACE__ . 'TipPluginInterface::getOutput is deprecated. Use getBody() instead. See https://www.drupal.org/node/3204096', E_USER_WARNING);
        // This class must implement TipPluginInterface, but this method is
        // deprecated. An empty array is returned to meet interface requirements.
        return [];
    }
    
    /**
     * Determines the placement of the tip relative to the element.
     *
     * If null, the tip will automatically determine the best position based on
     * the element's position in the viewport.
     *
     * @return string|null
     *   The tip placement relative to the element.
     *
     * @see https://shepherdjs.dev/docs/Step.html
     */
    public function getLocation() : ?string {
        $location = $this->get('position');
        // The location values accepted by PopperJS, the library used for
        // positioning the tip.
        assert(in_array(trim($location ?? ''), [
            'auto',
            'auto-start',
            'auto-end',
            'top',
            'top-start',
            'top-end',
            'bottom',
            'bottom-start',
            'bottom-end',
            'right',
            'right-start',
            'right-end',
            'left',
            'left-start',
            'left-end',
            '',
        ], TRUE), "{$location} is not a valid Tour Tip position value");
        return $location;
    }
    
    /**
     * The selector the tour tip will attach to.
     *
     * This is mapped to the `attachTo.element` property of the Shepherd tooltip
     * options.
     *
     * @return null|string
     *   A selector string, or null for an unattached tip.
     *
     * @see https://shepherdjs.dev/docs/Step.html
     */
    public function getSelector() : ?string {
        return $this->get('selector');
    }

}