<?php

namespace Drupal\block_content\Entity;

use Drupal\Core\Entity\ContentEntityBase;
use Drupal\Core\Entity\EntityChangedTrait;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;
use Drupal\block_content\BlockContentInterface;
use Drupal\user\UserInterface;

/**
 * Defines the custom block entity class.
 *
 * @ContentEntityType(
 *   id = "block_content",
 *   label = @Translation("Custom block"),
 *   bundle_label = @Translation("Custom block type"),
 *   handlers = {
 *     "storage" = "Drupal\Core\Entity\Sql\SqlContentEntityStorage",
 *     "access" = "Drupal\block_content\BlockContentAccessControlHandler",
 *     "list_builder" = "Drupal\block_content\BlockContentListBuilder",
 *     "view_builder" = "Drupal\block_content\BlockContentViewBuilder",
 *     "views_data" = "Drupal\block_content\BlockContentViewsData",
 *     "form" = {
 *       "add" = "Drupal\block_content\BlockContentForm",
 *       "edit" = "Drupal\block_content\BlockContentForm",
 *       "delete" = "Drupal\block_content\Form\BlockContentDeleteForm",
 *       "default" = "Drupal\block_content\BlockContentForm"
 *     },
 *     "translation" = "Drupal\block_content\BlockContentTranslationHandler"
 *   },
 *   admin_permission = "administer blocks",
 *   base_table = "block_content",
 *   revision_table = "block_content_revision",
 *   data_table = "block_content_field_data",
 *   revision_data_table = "block_content_field_revision",
 *   show_revision_ui = TRUE,
 *   links = {
 *     "canonical" = "/block/{block_content}",
 *     "delete-form" = "/block/{block_content}/delete",
 *     "edit-form" = "/block/{block_content}",
 *     "collection" = "/admin/structure/block/block-content",
 *   },
 *   translatable = TRUE,
 *   entity_keys = {
 *     "id" = "id",
 *     "revision" = "revision_id",
 *     "bundle" = "type",
 *     "label" = "info",
 *     "langcode" = "langcode",
 *     "uuid" = "uuid"
 *   },
 *   bundle_entity_type = "block_content_type",
 *   field_ui_base_route = "entity.block_content_type.edit_form",
 *   render_cache = FALSE,
 * )
 *
 * Note that render caching of block_content entities is disabled because they
 * are always rendered as blocks, and blocks already have their own render
 * caching.
 * See https://www.drupal.org/node/2284917#comment-9132521 for more information.
 */
class BlockContent extends ContentEntityBase implements BlockContentInterface {

  use EntityChangedTrait;

  /**
   * The theme the block is being created in.
   *
   * When creating a new custom block from the block library, the user is
   * redirected to the configure form for that block in the given theme. The
   * theme is stored against the block when the custom block add form is shown.
   *
   * @var string
   */
  protected $theme;

  /**
   * {@inheritdoc}
   */
  public function createDuplicate() {
    $duplicate = parent::createDuplicate();
    $duplicate->revision_id->value = NULL;
    $duplicate->id->value = NULL;
    return $duplicate;
  }

  /**
   * {@inheritdoc}
   */
  public function setTheme($theme) {
    $this->theme = $theme;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getTheme() {
    return $this->theme;
  }

  /**
   * {@inheritdoc}
   */
  public function postSave(EntityStorageInterface $storage, $update = TRUE) {
    parent::postSave($storage, $update);
    static::invalidateBlockPluginCache();
  }

  /**
   * {@inheritdoc}
   */
  public static function postDelete(EntityStorageInterface $storage, array $entities) {
    parent::postDelete($storage, $entities);
    static::invalidateBlockPluginCache();
  }

  /**
   * {@inheritdoc}
   */
  public function getInstances() {
    return \Drupal::entityTypeManager()->getStorage('block')->loadByProperties(['plugin' => 'block_content:' . $this->uuid()]);
  }

  /**
   * {@inheritdoc}
   */
  public function preSaveRevision(EntityStorageInterface $storage, \stdClass $record) {
    parent::preSaveRevision($storage, $record);

    if (!$this->isNewRevision() && isset($this->original) && (!isset($record->revision_log) || $record->revision_log === '')) {
      // If we are updating an existing block_content without adding a new
      // revision and the user did not supply a revision log, keep the existing
      // one.
      $record->revision_log = $this->original->getRevisionLogMessage();
    }
  }

  /**
   * {@inheritdoc}
   */
  public function delete() {
    foreach ($this->getInstances() as $instance) {
      $instance->delete();
    }
    parent::delete();
  }

  /**
   * {@inheritdoc}
   */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
    $fields = parent::baseFieldDefinitions($entity_type);

    $fields['id']->setLabel(t('Custom block ID'))
      ->setDescription(t('The custom block ID.'));

    $fields['uuid']->setDescription(t('The custom block UUID.'));

    $fields['revision_id']->setDescription(t('The revision ID.'));

    $fields['langcode']->setDescription(t('The custom block language code.'));

    $fields['type']->setLabel(t('Block type'))
      ->setDescription(t('The block type.'));

    $fields['info'] = BaseFieldDefinition::create('string')
      ->setLabel(t('Block description'))
      ->setDescription(t('A brief description of your block.'))
      ->setRevisionable(TRUE)
      ->setTranslatable(TRUE)
      ->setRequired(TRUE)
      ->setDisplayOptions('form', [
        'type' => 'string_textfield',
        'weight' => -5,
      ])
      ->setDisplayConfigurable('form', TRUE)
      ->addConstraint('UniqueField', []);

    $fields['revision_log'] = BaseFieldDefinition::create('string_long')
      ->setLabel(t('Revision log message'))
      ->setDescription(t('The log entry explaining the changes in this revision.'))
      ->setRevisionable(TRUE)
      ->setDisplayOptions('form', [
        'type' => 'string_textarea',
        'weight' => 25,
        'settings' => [
          'rows' => 4,
        ],
      ]);

    $fields['changed'] = BaseFieldDefinition::create('changed')
      ->setLabel(t('Changed'))
      ->setDescription(t('The time that the custom block was last edited.'))
      ->setTranslatable(TRUE)
      ->setRevisionable(TRUE);

    $fields['revision_created'] = BaseFieldDefinition::create('created')
      ->setLabel(t('Revision create time'))
      ->setDescription(t('The time that the current revision was created.'))
      ->setRevisionable(TRUE);

    $fields['revision_user'] = BaseFieldDefinition::create('entity_reference')
      ->setLabel(t('Revision user'))
      ->setDescription(t('The user ID of the author of the current revision.'))
      ->setSetting('target_type', 'user')
      ->setRevisionable(TRUE);

    $fields['revision_translation_affected'] = BaseFieldDefinition::create('boolean')
      ->setLabel(t('Revision translation affected'))
      ->setDescription(t('Indicates if the last edit of a translation belongs to current revision.'))
      ->setReadOnly(TRUE)
      ->setRevisionable(TRUE)
      ->setTranslatable(TRUE);

    return $fields;
  }

  /**
   * {@inheritdoc}
   */
  public function getRevisionLog() {
    return $this->getRevisionLogMessage();
  }

  /**
   * {@inheritdoc}
   */
  public function setInfo($info) {
    $this->set('info', $info);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function setRevisionLog($revision_log) {
    return $this->setRevisionLogMessage($revision_log);
  }

  /**
   * {@inheritdoc}
   */
  public function getRevisionCreationTime() {
    return $this->get('revision_created')->value;
  }

  /**
   * {@inheritdoc}
   */
  public function setRevisionCreationTime($timestamp) {
    $this->set('revision_created', $timestamp);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getRevisionUser() {
    return $this->get('revision_user')->entity;
  }

  public function setRevisionUser(UserInterface $account) {
    $this->set('revision_user', $account);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getRevisionUserId() {
    return $this->get('revision_user')->entity->id();
  }

  /**
   * {@inheritdoc}
   */
  public function setRevisionUserId($user_id) {
    $this->set('revision_user', $user_id);
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getRevisionLogMessage() {
    return $this->get('revision_log')->value;
  }

  /**
   * {@inheritdoc}
   */
  public function setRevisionLogMessage($revision_log_message) {
    $this->set('revision_log', $revision_log_message);
    return $this;
  }

  /**
   * Invalidates the block plugin cache after changes and deletions.
   */
  protected static function invalidateBlockPluginCache() {
    // Invalidate the block cache to update custom block-based derivatives.
    \Drupal::service('plugin.manager.block')->clearCachedDefinitions();
  }

}