<?php

namespace Drupal\content_translation;

use Drupal\Core\Entity\EntityInterface;
use Drupal\workflows\Entity\Workflow;
use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;

/**
 * Provides common functionality for content translation.
 */
class ContentTranslationManager implements ContentTranslationManagerInterface, BundleTranslationSettingsInterface {

  /**
   * The entity type bundle info provider.
   *
   * @var \Drupal\Core\Entity\EntityTypeBundleInfoInterface
   */
  protected $entityTypeBundleInfo;

  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * Constructs a ContentTranslationManageAccessCheck object.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $entity_type_bundle_info
   *   The entity type bundle info provider.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info) {
    $this->entityTypeManager = $entity_type_manager;
    $this->entityTypeBundleInfo = $entity_type_bundle_info;
  }

  /**
   * {@inheritdoc}
   */
  public function getTranslationHandler($entity_type_id) {
    return $this->entityTypeManager->getHandler($entity_type_id, 'translation');
  }

  /**
   * {@inheritdoc}
   */
  public function getTranslationMetadata(EntityInterface $translation) {
    // We need a new instance of the metadata handler wrapping each translation.
    $entity_type = $translation->getEntityType();
    $class = $entity_type->get('content_translation_metadata');
    return new $class($translation, $this->getTranslationHandler($entity_type->id()));
  }

  /**
   * {@inheritdoc}
   */
  public function isSupported($entity_type_id) {
    $entity_type = $this->entityTypeManager->getDefinition($entity_type_id);
    return $entity_type->isTranslatable() && ($entity_type->hasLinkTemplate('drupal:content-translation-overview') || $entity_type->get('content_translation_ui_skip'));
  }

  /**
   * {@inheritdoc}
   */
  public function getSupportedEntityTypes() {
    $supported_types = [];
    foreach ($this->entityTypeManager->getDefinitions() as $entity_type_id => $entity_type) {
      if ($this->isSupported($entity_type_id)) {
        $supported_types[$entity_type_id] = $entity_type;
      }
    }
    return $supported_types;
  }

  /**
   * {@inheritdoc}
   */
  public function setEnabled($entity_type_id, $bundle, $value) {
    $config = $this->loadContentLanguageSettings($entity_type_id, $bundle);
    $config->setThirdPartySetting('content_translation', 'enabled', $value)->save();
  }

  /**
   * {@inheritdoc}
   */
  public function isEnabled($entity_type_id, $bundle = NULL) {
    $enabled = FALSE;

    if ($this->isSupported($entity_type_id)) {
      $bundles = !empty($bundle) ? [$bundle] : array_keys($this->entityTypeBundleInfo->getBundleInfo($entity_type_id));
      foreach ($bundles as $bundle) {
        $config = $this->loadContentLanguageSettings($entity_type_id, $bundle);
        if ($config->getThirdPartySetting('content_translation', 'enabled', FALSE)) {
          $enabled = TRUE;
          break;
        }
      }
    }

    return $enabled;
  }

  /**
   * {@inheritdoc}
   */
  public function setBundleTranslationSettings($entity_type_id, $bundle, array $settings) {
    $config = $this->loadContentLanguageSettings($entity_type_id, $bundle);
    $config->setThirdPartySetting('content_translation', 'bundle_settings', $settings)
      ->save();
  }

  /**
   * {@inheritdoc}
   */
  public function getBundleTranslationSettings($entity_type_id, $bundle) {
    $config = $this->loadContentLanguageSettings($entity_type_id, $bundle);
    return $config->getThirdPartySetting('content_translation', 'bundle_settings', []);
  }

  /**
   * Loads a content language config entity based on the entity type and bundle.
   *
   * @param string $entity_type_id
   *   ID of the entity type.
   * @param string $bundle
   *   Bundle name.
   *
   * @return \Drupal\language\Entity\ContentLanguageSettings
   *   The content language config entity if one exists. Otherwise, returns
   *   default values.
   */
  protected function loadContentLanguageSettings($entity_type_id, $bundle) {
    if ($entity_type_id == NULL || $bundle == NULL) {
      return NULL;
    }
    $config = $this->entityTypeManager->getStorage('language_content_settings')->load($entity_type_id . '.' . $bundle);
    if ($config == NULL) {
      $config = $this->entityTypeManager->getStorage('language_content_settings')->create(['target_entity_type_id' => $entity_type_id, 'target_bundle' => $bundle]);
    }
    return $config;
  }

  /**
   * Checks whether support for pending revisions should be enabled.
   *
   * @param string $entity_type_id
   *   The ID of the entity type to be checked.
   * @param string $bundle_id
   *   (optional) The ID of the bundle to be checked. Defaults to none.
   *
   * @return bool
   *   TRUE if pending revisions should be enabled, FALSE otherwise.
   *
   * @internal
   *   There is ongoing discussion about how pending revisions should behave.
   *   The logic enabling pending revision support is likely to change once a
   *   decision is made.
   *
   * @see https://www.drupal.org/node/2940575
   */
  public static function isPendingRevisionSupportEnabled($entity_type_id, $bundle_id = NULL) {
    if (!\Drupal::moduleHandler()->moduleExists('content_moderation')) {
      return FALSE;
    }

    foreach (Workflow::loadMultipleByType('content_moderation') as $workflow) {
      /** @var \Drupal\content_moderation\Plugin\WorkflowType\ContentModeration $plugin */
      $plugin = $workflow->getTypePlugin();
      $entity_type_ids = array_flip($plugin->getEntityTypes());
      if (isset($entity_type_ids[$entity_type_id])) {
        if (!isset($bundle_id)) {
          return TRUE;
        }
        else {
          $bundle_ids = array_flip($plugin->getBundlesForEntityType($entity_type_id));
          if (isset($bundle_ids[$bundle_id])) {
            return TRUE;
          }
        }
      }
    }

    return FALSE;
  }

}
