function llms_get_restriction_message( $restriction ) {

	$msg = __( 'You do not have permission to access this content', 'lifterlms' );

	switch ( $restriction['reason'] ) {

		case 'course_prerequisite':
			$lesson      = new LLMS_Lesson( $restriction['content_id'] );
			$course_id   = $restriction['restriction_id'];
			$prereq_link = '<a href="' . get_permalink( $course_id ) . '">' . get_the_title( $course_id ) . '</a>';
			$msg         = sprintf(
				/* Translators: %$1s = lesson title; %2$s link of the course prerequisite */
				_x(
					'The lesson "%1$s" cannot be accessed until the required prerequisite course "%2$s" is completed.',
					'restricted by course prerequisite message',
					'lifterlms'
				),
				$lesson->get( 'title' ),
				$prereq_link
			);
			break;

		case 'course_track_prerequisite':
			$lesson      = new LLMS_Lesson( $restriction['content_id'] );
			$track       = new LLMS_Track( $restriction['restriction_id'] );
			$prereq_link = '<a href="' . $track->get_permalink() . '">' . $track->term->name . '</a>';
			$msg         = sprintf(
				/* Translators: %$1s = lesson title; %2$s link of the track prerequisite */
				_x(
					'The lesson "%1$s" cannot be accessed until the required prerequisite track "%2$s" is completed.',
					'restricted by course track prerequisite message',
					'lifterlms'
				),
				$lesson->get( 'title' ),
				$prereq_link
			);
			break;

		// this particular case is only utilized by lessons, courses do the check differently in the template.
		case 'course_time_period':
			$course = new LLMS_Course( $restriction['restriction_id'] );
			// if the start date hasn't passed yet.
			if ( ! $course->has_date_passed( 'start_date' ) ) {
				$msg = $course->get( 'course_opens_message' );
			} elseif ( $course->has_date_passed( 'end_date' ) ) {
				$msg = $course->get( 'course_closed_message' );
			}
			break;

		case 'enrollment_lesson':
			$course = new LLMS_Course( $restriction['restriction_id'] );
			$msg    = $course->get( 'content_restricted_message' );
			break;

		case 'lesson_drip':
			$lesson = new LLMS_Lesson( $restriction['restriction_id'] );
			$msg    = sprintf(
				/* Translators: %$1s = lesson title; %2$s available date */
				_x(
					'The lesson "%1$s" will be available on %2$s',
					'lesson restricted by drip settings message',
					'lifterlms'
				),
				$lesson->get( 'title' ),
				$lesson->get_available_date()
			);
			break;

		case 'lesson_prerequisite':
			$lesson        = new LLMS_Lesson( $restriction['content_id'] );
			$prereq_lesson = new LLMS_Lesson( $restriction['restriction_id'] );
			$prereq_link   = '<a href="' . get_permalink( $prereq_lesson->get( 'id' ) ) . '">' . $prereq_lesson->get( 'title' ) . '</a>';
			$msg           = sprintf(
				/* Translators: %$1s = lesson title; %2$s link of the lesson prerequisite */
				_x(
					'The lesson "%1$s" cannot be accessed until the required prerequisite "%2$s" is completed.',
					'lesson restricted by prerequisite message',
					'lifterlms'
				),
				$lesson->get( 'title' ),
				$prereq_link
			);
			break;

		default:
	}

	/**
	 * Allow filtering the restriction message.
	 *
	 * @since Unknown
	 *
	 * @param string $msg         Restriction message.
	 * @param array  $restriction Array of data from `llms_page_restricted()`.
	 */
	return apply_filters( 'llms_get_restriction_message', do_shortcode( $msg ), $restriction );
}