private function _sync_complete_course_content_with_user_data( $course_id, $content_id, $scope = 'complete' ) {
		global $wpdb;

		$user_id = $this->user_id;

		//Delete First
		$delete_state = true;
		if ( $scope === 'delete' ) {

			$content = get_post( $content_id );
			if ( $content->post_type === 'dozent_quiz' ) {
				$quiz_attempts = dozent_get_attempts( [ 'quiz_id' => $content_id ] );
				if ( $quiz_attempts->count ) {
					$delete_state = false;
				}
			}
		}

		/**
		 * now delete if state is deleted
		 */
		if ( $delete_state ) {
			$wpdb->delete( $wpdb->dozent_completes, [ 'content_id' => $content_id ] );
		}

		$total_contents = (int) dozent_count( dozent_get_course_contents( $course_id ) );

		$completes = $wpdb->get_results( "SELECT * FROM {$wpdb->dozent_completes} WHERE user_id = {$user_id} AND course_id = {$course_id} ", ARRAY_A );

		$completes = wp_list_pluck( $completes, 'content_id' );

		$completed_count = dozent_count( $completes );
		$percent         = 0;
		if ( $total_contents && $completed_count ) {
			$percent = (int) number_format( ( $completed_count * 100 ) / $total_contents );
		}

		$completed_courses                          = (array) $this->get( 'completed_courses' );
		$completed_courses[ $course_id ]['percent'] = $percent;

		//Save Array Unique
		$content_ids   = $completes;
		$content_ids[] = $content_id;

		/**
		 * Remove content iD from the user cache,
		 * if state is delete
		 */

		if ( $delete_state ) {
			if ( ( $key = array_search( $content_id, $content_ids ) ) !== false ) {
				unset( $content_ids[ $key ] );
			}
		}

		$completed_courses[ $course_id ]['content_ids'] = array_unique( $content_ids );

		$this->update( 'completed_courses', array_filter( $completed_courses ) );
	}