class MediaDevelGenerate

class MediaDevelGenerate extends DevelGenerateBase implements ContainerFactoryPluginInterface {
    
    /**
     * The media entity storage.
     *
     * @var \Drupal\Core\Entity\ContentEntityStorageInterface
     */
    protected $mediaStorage;
    
    /**
     * The media type entity storage.
     *
     * @var \Drupal\Core\Config\Entity\ConfigEntityStorageInterface
     */
    protected $mediaTypeStorage;
    
    /**
     * The user entity storage.
     *
     * @var \Drupal\user\UserStorageInterface
     */
    protected $userStorage;
    
    /**
     * The language manager service.
     *
     * @var \Drupal\Core\Language\LanguageManagerInterface
     */
    protected $languageManager;
    
    /**
     * The url generator service.
     *
     * @var \Drupal\Core\Routing\UrlGeneratorInterface
     */
    protected $urlGenerator;
    
    /**
     * The date formatter service.
     *
     * @var \Drupal\Core\Datetime\DateFormatterInterface
     */
    protected $dateFormatter;
    
    /**
     * The system time service.
     *
     * @var \Drupal\Component\Datetime\TimeInterface
     */
    protected $time;
    
    /**
     * The Drush batch flag.
     *
     * @var bool
     */
    protected $drushBatch;
    
    /**
     * Constructs a new 'media' plugin instance.
     *
     * @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 definition.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager service.
     * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
     *   The language manager service.
     * @param \Drupal\Core\Routing\UrlGeneratorInterface $url_generator
     *   The url generator service.
     * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
     *   The date formatter service.
     * @param \Drupal\Component\Datetime\TimeInterface $time
     *   The time service.
     *
     * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
     *   Thrown if the storage handler couldn't be loaded.
     * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
     *   Thrown if the entity type doesn't exist.
     */
    public function __construct(array $configuration, $plugin_id, array $plugin_definition, EntityTypeManagerInterface $entity_type_manager, LanguageManagerInterface $language_manager, UrlGeneratorInterface $url_generator, DateFormatterInterface $date_formatter, TimeInterface $time) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->mediaStorage = $entity_type_manager->getStorage('media');
        $this->mediaTypeStorage = $entity_type_manager->getStorage('media_type');
        $this->userStorage = $entity_type_manager->getStorage('user');
        $this->languageManager = $language_manager;
        $this->urlGenerator = $url_generator;
        $this->dateFormatter = $date_formatter;
        $this->time = $time;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity_type.manager'), $container->get('language_manager'), $container->get('url_generator'), $container->get('date.formatter'), $container->get('datetime.time'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function settingsForm(array $form, FormStateInterface $form_state) {
        $types = $this->mediaTypeStorage
            ->loadMultiple();
        if (empty($types)) {
            $create_url = $this->urlGenerator
                ->generateFromRoute('entity.media_type.add_form');
            $this->setMessage($this->t('You do not have any media types that can be generated. <a href=":url">Go create a new media type</a>', [
                ':url' => $create_url,
            ]), MessengerInterface::TYPE_ERROR);
            return [];
        }
        $options = [];
        foreach ($types as $type) {
            $options[$type->id()] = [
                'type' => [
                    '#markup' => $type->label(),
                ],
            ];
        }
        $form['media_types'] = [
            '#type' => 'tableselect',
            '#header' => [
                'type' => $this->t('Media type'),
            ],
            '#options' => $options,
        ];
        $form['kill'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('<strong>Delete all media</strong> in these types before generating new media.'),
            '#default_value' => $this->getSetting('kill'),
        ];
        $form['num'] = [
            '#type' => 'number',
            '#title' => $this->t('How many media items would you like to generate?'),
            '#default_value' => $this->getSetting('num'),
            '#required' => TRUE,
            '#min' => 0,
        ];
        $options = [
            1 => $this->t('Now'),
        ];
        foreach ([
            3600,
            86400,
            604800,
            2592000,
            31536000,
        ] as $interval) {
            $options[$interval] = $this->dateFormatter
                ->formatInterval($interval, 1) . ' ' . $this->t('ago');
        }
        $form['time_range'] = [
            '#type' => 'select',
            '#title' => $this->t('How far back in time should the media be dated?'),
            '#description' => $this->t('Media creation dates will be distributed randomly from the current time, back to the selected time.'),
            '#options' => $options,
            '#default_value' => 604800,
        ];
        $form['name_length'] = [
            '#type' => 'number',
            '#title' => $this->t('Maximum number of words in names'),
            '#default_value' => $this->getSetting('name_length'),
            '#required' => TRUE,
            '#min' => 1,
            '#max' => 255,
        ];
        $options = [];
        // We always need a language.
        $languages = $this->languageManager
            ->getLanguages(LanguageInterface::STATE_ALL);
        foreach ($languages as $langcode => $language) {
            $options[$langcode] = $language->getName();
        }
        $form['add_language'] = [
            '#type' => 'select',
            '#title' => $this->t('Set language on media'),
            '#multiple' => TRUE,
            '#description' => $this->t('Requires locale.module'),
            '#options' => $options,
            '#default_value' => [
                $this->languageManager
                    ->getDefaultLanguage()
                    ->getId(),
            ],
        ];
        $form['#redirect'] = FALSE;
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function settingsFormValidate(array $form, FormStateInterface $form_state) {
        // Remove the media types not selected.
        $media_types = array_filter($form_state->getValue('media_types'));
        if (!$media_types) {
            $form_state->setErrorByName('media_types', $this->t('Please select at least one media type'));
        }
        // Store the normalized value back, in form state.
        $form_state->setValue('media_types', array_combine($media_types, $media_types));
    }
    
    /**
     * {@inheritdoc}
     */
    protected function generateElements(array $values) {
        if ($this->isBatch($values['num'])) {
            $this->generateBatchMedia($values);
        }
        else {
            $this->generateMedia($values);
        }
    }
    
    /**
     * Method for creating media when number of elements is less than 50.
     *
     * @param array $values
     *   Array of values submitted through a form.
     *
     * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
     *   Thrown if the storage handler couldn't be loaded.
     * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
     *   Thrown if the entity type doesn't exist.
     * @throws \Drupal\Core\Entity\EntityStorageException
     *   Thrown if the bundle does not exist or was needed but not specified.
     */
    protected function generateMedia(array $values) {
        if (!empty($values['kill']) && $values['media_types']) {
            $this->mediaKill($values);
        }
        if (!empty($values['media_types'])) {
            // Generate media items.
            $this->preGenerate($values);
            $start = time();
            for ($i = 1; $i <= $values['num']; $i++) {
                $this->createMediaItem($values);
                if (isset($values['feedback']) && $i % $values['feedback'] == 0) {
                    $now = time();
                    $this->messenger()
                        ->addStatus(dt('Completed !feedback media items (!rate media/min)', [
                        '!feedback' => $values['feedback'],
                        '!rate' => $values['feedback'] * 60 / ($now - $start),
                    ]));
                    $start = $now;
                }
            }
        }
        $this->setMessage($this->formatPlural($values['num'], '1 media item created.', 'Finished creating @count media items.'));
    }
    
    /**
     * Method for creating media when number of elements is greater than 50.
     *
     * @param array $values
     *   The input values from the settings form.
     */
    protected function generateBatchMedia(array $values) {
        $operations = [];
        // Setup the batch operations and save the variables.
        $operations[] = [
            'devel_generate_operation',
            [
                $this,
                'batchPreGenerate',
                $values,
            ],
        ];
        // Add the kill operation.
        if ($values['kill']) {
            $operations[] = [
                'devel_generate_operation',
                [
                    $this,
                    'batchMediaKill',
                    $values,
                ],
            ];
        }
        // Add the operations to create the media.
        for ($num = 0; $num < $values['num']; $num++) {
            $operations[] = [
                'devel_generate_operation',
                [
                    $this,
                    'batchCreateMediaItem',
                    $values,
                ],
            ];
        }
        // Start the batch.
        $batch = [
            'title' => $this->t('Generating media items'),
            'operations' => $operations,
            'finished' => 'devel_generate_batch_finished',
            'file' => drupal_get_path('module', 'devel_generate') . '/devel_generate.batch.inc',
        ];
        batch_set($batch);
        if ($this->drushBatch) {
            drush_backend_batch_process();
        }
    }
    
    /**
     * Provides a batch version of preGenerate().
     *
     * @param array $vars
     *   The input values from the settings form.
     * @param iterable $context
     *   Batch job context.
     *
     * @see self::preGenerate()
     */
    public function batchPreGenerate(array $vars, iterable &$context) {
        $context['results'] = $vars;
        $context['results']['num'] = 0;
        $this->preGenerate($context['results']);
    }
    
    /**
     * Provides a batch version of createMediaItem().
     *
     * @param array $vars
     *   The input values from the settings form.
     * @param iterable $context
     *   Batch job context.
     *
     * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
     *   Thrown if the storage handler couldn't be loaded.
     * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
     *   Thrown if the entity type doesn't exist.
     * @throws \Drupal\Core\Entity\EntityStorageException
     *   Thrown if the bundle does not exist or was needed but not specified.
     *
     * @see self::createMediaItem()
     */
    public function batchCreateMediaItem(array $vars, iterable &$context) {
        if ($this->drushBatch) {
            $this->createMediaItem($vars);
        }
        else {
            $this->createMediaItem($context['results']);
        }
        if (!isset($context['results']['num'])) {
            $context['results']['num'] = 0;
        }
        $context['results']['num']++;
    }
    
    /**
     * Provides a batch version of mediaKill().
     *
     * @param array $vars
     *   The input values from the settings form.
     * @param iterable $context
     *   Batch job context.
     *
     * @see self::mediaKill()
     */
    public function batchMediaKill(array $vars, iterable &$context) {
        if ($this->drushBatch) {
            $this->mediaKill($vars);
        }
        else {
            $this->mediaKill($context['results']);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateDrushParams(array $args, array $options = []) {
        $add_language = $options['languages'];
        if (!empty($add_language)) {
            $add_language = explode(',', str_replace(' ', '', $add_language));
            // Intersect with the enabled languages to make sure the language args
            // passed are actually enabled.
            $values['values']['add_language'] = array_intersect($add_language, array_keys($this->languageManager
                ->getLanguages(LanguageInterface::STATE_ALL)));
        }
        $values['kill'] = $options['kill'];
        $values['feedback'] = $options['feedback'];
        $values['name_length'] = 6;
        $values['num'] = array_shift($args);
        $all_media_types = array_values($this->mediaTypeStorage
            ->getQuery()
            ->execute());
        $requested_media_types = StringUtils::csvToArray($options['media-types'] ?: $all_media_types);
        if (empty($requested_media_types)) {
            throw new \Exception(dt('No media types available'));
        }
        // Check for any missing media type.
        if ($invalid_media_types = array_diff($requested_media_types, $all_media_types)) {
            throw new \Exception("Requested media types don't exists: " . implode(', ', $invalid_media_types));
        }
        $values['media_types'] = array_combine($requested_media_types, $requested_media_types);
        if ($this->isBatch($values['num'])) {
            $this->drushBatch = TRUE;
            $this->preGenerate($values);
        }
        return $values;
    }
    
    /**
     * Deletes all media of given media media types.
     *
     * @param array $values
     *   The input values from the settings form.
     *
     * @throws \Drupal\Core\Entity\EntityStorageException
     *   Thrown if the media type does not exist.
     */
    protected function mediaKill(array $values) {
        $mids = $this->mediaStorage
            ->getQuery()
            ->condition('bundle', $values['media_types'], 'IN')
            ->execute();
        if (!empty($mids)) {
            $media = $this->mediaStorage
                ->loadMultiple($mids);
            $this->mediaStorage
                ->delete($media);
            $this->setMessage($this->t('Deleted %count media items.', [
                '%count' => count($mids),
            ]));
        }
    }
    
    /**
     * Code to be run before generating items.
     *
     * Returns the same array passed in as parameter, but with an array of uids
     * for the key 'users'.
     *
     * @param array $results
     *   The input values from the settings form.
     */
    protected function preGenerate(array &$results) {
        // Get user id.
        $users = array_values($this->userStorage
            ->getQuery()
            ->range(0, 50)
            ->execute());
        $users = array_merge($users, [
            '0',
        ]);
        $results['users'] = $users;
    }
    
    /**
     * Create one media item. Used by both batch and non-batch code branches.
     *
     * @param array $results
     *   The input values from the settings form.
     *
     * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
     *   Thrown if the storage handler couldn't be loaded.
     * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
     *   Thrown if the entity type doesn't exist.
     * @throws \Drupal\Core\Entity\EntityStorageException
     *   Thrown if the bundle does not exist or was needed but not specified.
     */
    protected function createMediaItem(array &$results) {
        if (!isset($results['time_range'])) {
            $results['time_range'] = 0;
        }
        $media_type = array_rand($results['media_types']);
        $uid = $results['users'][array_rand($results['users'])];
        $media = $this->mediaStorage
            ->create([
            'bundle' => $media_type,
            'name' => $this->getRandom()
                ->sentences(mt_rand(1, $results['name_length']), TRUE),
            'uid' => $uid,
            'revision' => mt_rand(0, 1),
            'status' => TRUE,
            'moderation_state' => 'published',
            'created' => $this->time
                ->getRequestTime() - mt_rand(0, $results['time_range']),
            'langcode' => $this->getLangcode($results),
        ]);
        // A flag to let hook implementations know that this is a generated item.
        $media->devel_generate = $results;
        // Populate all fields with sample values.
        $this->populateFields($media);
        $media->save();
    }
    
    /**
     * Determine language based on $results.
     *
     * @param array $results
     *   The input values from the settings form.
     *
     * @return string
     *   The language code.
     */
    protected function getLangcode(array $results) {
        if (isset($results['add_language'])) {
            $langcodes = $results['add_language'];
            $langcode = $langcodes[array_rand($langcodes)];
        }
        else {
            $langcode = $this->languageManager
                ->getDefaultLanguage()
                ->getId();
        }
        return $langcode;
    }
    
    /**
     * Finds out if the media item generation will run in batch process.
     *
     * @param int $media_items_count
     *   Number of media items to be generated.
     *
     * @return bool
     *   If the process should be a batch process.
     */
    protected function isBatch($media_items_count) {
        return $media_items_count >= 50;
    }

}