<?php

namespace Drupal\DrupalExtension\Listener;

use Behat\Behat\EventDispatcher\Event\ExampleTested;
use Behat\Behat\EventDispatcher\Event\ScenarioLikeTested;
use Behat\Behat\EventDispatcher\Event\ScenarioTested;

use Drupal\DrupalDriverManager;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Drupal driver listener.
 *
 * Determines which Drupal driver to use for a given scenario or outline.
 */
class DriverListener implements EventSubscriberInterface {

  /**
   * Drupal driver manager.
   *
   * @var \Drupal\DrupalDriverManager
   */
  private $drupal;

  /**
   * Test parameters.
   *
   * @var array
   */
  private $parameters;

  public function __construct(DrupalDriverManager $drupal, array $parameters) {
    $this->drupal = $drupal;
    $this->parameters = $parameters;
  }

  /**
   * {@inheritDoc}
   */
  public static function getSubscribedEvents() {
    return array(
      ScenarioTested::BEFORE => array('prepareDefaultDrupalDriver', 11),
      ExampleTested::BEFORE => array('prepareDefaultDrupalDriver', 11),
    );
  }

  /**
   * Configures default Drupal driver to use before each scenario or outline.
   *
   * `@api` tagged scenarios will get the `api_driver` as the default driver.
   *
   * Other scenarios get the `default_driver` as the default driver.
   *
   * @param ScenarioEvent|OutlineEvent $event
   */
  public function prepareDefaultDrupalDriver($event) {
    $feature = $event->getFeature();
    $scenario = $event instanceof ScenarioLikeTested ? $event->getScenario() : $event->getOutline();

    // Get the default driver.
    $driver = $this->parameters['default_driver'];

    foreach (array_merge($feature->getTags(), $scenario->getTags()) as $tag) {
      if (!empty($this->parameters[$tag . '_driver'])) {
        $driver = $this->parameters[$tag . '_driver'];
      }
    }

    // Set the default driver.
    $this->drupal->setDefaultDriverName($driver);

    // Set the environment.
    $environment = $event->getEnvironment();
    $this->drupal->setEnvironment($environment);
  }

}