public function dozent_save_lecture() {
		$course_id       = (int) dozent_input_text( 'course_id' );
		$item_id         = (int) dozent_input_text( 'item_id' );
		$title           = dozent_input_text( 'title' );
		$lecture_content = dozent_input_array_field( 'lecture_content' );
		$section_id      = dozent_input_array_field( 'section_id' );
		$preview         = dozent_input_text( 'lecture_preview' );

		$post_arr = [
			'post_type'    => 'dozent_lecture',
			'post_title'   => $title,
			'post_content' => $lecture_content,
			'post_status'  => 'publish',
			'post_author'  => get_current_user_id(),
			'post_parent'  => $section_id,
		];

		if ( $item_id ) {
			$item                   = get_post( $item_id );
			$post_arr['ID']         = $item_id;
			$post_arr['menu_order'] = $item->menu_order;
		} else {
			$menu_order_id          = dozent_get_next_curriculum_item_order_id( $course_id );
			$post_arr['menu_order'] = $menu_order_id;
		}

		$lecture_id = wp_insert_post( $post_arr );
		if ( $lecture_id ) {
			update_post_meta( $lecture_id, '_dozent_course_id', $course_id );

			//Save Video Info
			$video = dozent_input_array_field( 'video' );
			update_post_meta( $lecture_id, '_video', $video );

			/**
			 * Adding Attachments if users select anyone.
			 */

			$attachments = dozent_input_array_field( 'attachments' );
			if ( dozent_count( $attachments ) ) {
				update_post_meta( $lecture_id, '_attachments', $attachments );
			} else {
				delete_post_meta( $lecture_id, '_attachments' );
			}


			if ( $preview ) {
				update_post_meta( $lecture_id, '_lecture_preview', $preview );
			} else {
				delete_post_meta( $lecture_id, '_lecture_preview' );
			}

			//Register Action Hooks
			do_action( 'dozent/lecture/saved', $lecture_id, $course_id, $post_arr );
			if ( $lecture_id ) {
				do_action( 'dozent/lecture/updated', $lecture_id, $course_id, $post_arr );
			} else {
				do_action( 'dozent/lecture/created', $lecture_id, $course_id, $post_arr );
			}

		}

		ob_start();
		include DOZENT_ABSPATH . 'views/course_builder/curriculum.php';
		$course_contents = ob_get_clean();

		wp_send_json_success( [ 'lecture_id' => $lecture_id, 'curriculum' => $course_contents ] );
	}