class Contact

class Contact extends ContentEntityBase implements ContactInterface {
    use EntityChangedTrait;
    
    /**
     * {@inheritdoc}
     *
     * When a new entity instance is added, set the user_id entity reference to
     * the current user as the creator of the instance.
     */
    public static function preCreate(EntityStorageInterface $storage_controller, array &$values) {
        parent::preCreate($storage_controller, $values);
        $values += [
            'user_id' => \Drupal::currentUser()->id(),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getOwner() {
        return $this->get('user_id')->entity;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getOwnerId() {
        return $this->get('user_id')->target_id;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setOwnerId($uid) {
        $this->set('user_id', $uid);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setOwner(UserInterface $account) {
        $this->set('user_id', $account->id());
        return $this;
    }
    
    /**
     * {@inheritdoc}
     *
     * Define the field properties here.
     *
     * Field name, type and size determine the table structure.
     *
     * In addition, we can define how the field and its content can be manipulated
     * in the GUI. The behaviour of the widgets used can be determined here.
     */
    public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
        // Standard field, used as unique if primary index.
        $fields['id'] = BaseFieldDefinition::create('integer')->setLabel(t('ID'))
            ->setDescription(t('The ID of the Contact entity.'))
            ->setReadOnly(TRUE);
        // Standard field, unique outside of the scope of the current project.
        $fields['uuid'] = BaseFieldDefinition::create('uuid')->setLabel(t('UUID'))
            ->setDescription(t('The UUID of the Contact entity.'))
            ->setReadOnly(TRUE);
        // Name field for the contact.
        // We set display options for the view as well as the form.
        // Users with correct privileges can change the view and edit configuration.
        $fields['name'] = BaseFieldDefinition::create('string')->setLabel(t('Name'))
            ->setDescription(t('The name of the Contact entity.'))
            ->setSettings([
            'max_length' => 255,
            'text_processing' => 0,
        ])
            ->setDefaultValue(NULL)
            ->setDisplayOptions('view', [
            'label' => 'above',
            'type' => 'string',
            'weight' => -6,
        ])
            ->setDisplayOptions('form', [
            'type' => 'string_textfield',
            'weight' => -6,
        ])
            ->setDisplayConfigurable('form', TRUE)
            ->setDisplayConfigurable('view', TRUE);
        $fields['first_name'] = BaseFieldDefinition::create('string')->setLabel(t('First Name'))
            ->setDescription(t('The first name of the Contact entity.'))
            ->setSettings([
            'max_length' => 255,
            'text_processing' => 0,
        ])
            ->setDefaultValue(NULL)
            ->setDisplayOptions('view', [
            'label' => 'above',
            'type' => 'string',
            'weight' => -5,
        ])
            ->setDisplayOptions('form', [
            'type' => 'string_textfield',
            'weight' => -5,
        ])
            ->setDisplayConfigurable('form', TRUE)
            ->setDisplayConfigurable('view', TRUE);
        // Owner field of the contact.
        // Entity reference field, holds the reference to the user object.
        // The view shows the user name field of the user.
        // The form presents a auto complete field for the user name.
        $fields['user_id'] = BaseFieldDefinition::create('entity_reference')->setLabel(t('User Name'))
            ->setDescription(t('The Name of the associated user.'))
            ->setSetting('target_type', 'user')
            ->setSetting('handler', 'default')
            ->setDisplayOptions('view', [
            'label' => 'above',
            'type' => 'author',
            'weight' => -3,
        ])
            ->setDisplayOptions('form', [
            'type' => 'entity_reference_autocomplete',
            'settings' => [
                'match_operator' => 'CONTAINS',
                'match_limit' => 10,
                'size' => 60,
                'placeholder' => '',
            ],
            'weight' => -3,
        ])
            ->setDisplayConfigurable('form', TRUE)
            ->setDisplayConfigurable('view', TRUE);
        // Role field for the contact.
        // The values shown in options are 'administrator' and 'user'.
        $fields['role'] = BaseFieldDefinition::create('list_string')->setLabel(t('Role'))
            ->setDescription(t('The role of the Contact entity.'))
            ->setSettings([
            'allowed_values' => [
                'administrator' => 'administrator',
                'user' => 'user',
            ],
        ])
            ->setDefaultValue('user')
            ->setDisplayOptions('view', [
            'label' => 'above',
            'type' => 'string',
            'weight' => -2,
        ])
            ->setDisplayOptions('form', [
            'type' => 'options_select',
            'weight' => -2,
        ])
            ->setDisplayConfigurable('form', TRUE)
            ->setDisplayConfigurable('view', TRUE);
        $fields['langcode'] = BaseFieldDefinition::create('language')->setLabel(t('Language code'))
            ->setDescription(t('The language code of ContentEntityExample entity.'));
        $fields['created'] = BaseFieldDefinition::create('created')->setLabel(t('Created'))
            ->setDescription(t('The time that the entity was created.'));
        $fields['changed'] = BaseFieldDefinition::create('changed')->setLabel(t('Changed'))
            ->setDescription(t('The time that the entity was last edited.'));
        return $fields;
    }

}