* @return array
	 */
	public function get_fields() {

		$lesson = llms_get_post( $this->post );

		$methods = array(
			'date'       => __( 'On a specific date', 'lifterlms' ),
			'enrollment' => __( 'After course enrollment', 'lifterlms' ),
			'start'      => __( 'After course start date', 'lifterlms' ),
		);

		$section = $lesson->get_section();

		// Tf the lesson isn't first, add previous completion method.
		if ( 1 !== $lesson->get( 'order' ) || ( $section && 1 !== $section->get( 'order' ) ) ) {
			$methods['prerequisite'] = __( 'After prerequisite completion', 'lifterlms' );
		}

		// If the parent course has no start date set, unset the 'start' drip method.
		$course = $lesson->get_course();
		if ( ! $course || ! $course->get_date( 'start_date' ) ) {
			unset( $methods['start'] );
		}

		return array(
			array(
				'title'  => __( 'General', 'lifterlms' ),
				'fields' => array(
					array(
						'class'      => 'code input-full',
						'desc'       => sprintf( __( 'Paste the url for a Wistia, Vimeo or Youtube video or a hosted video file. For a full list of supported providers see %s.', 'lifterlms' ), '<a href="https://wordpress.org/documentation/article/embeds/#list-of-sites-you-can-embed-from" target="_blank">WordPress oEmbeds</a>' ),
						'desc_class' => 'd-all',
						'id'         => $this->prefix . 'video_embed',
						'label'      => __( 'Video Embed Url', 'lifterlms' ),
						'type'       => 'text',
					),
					array(
						'class'      => 'code input-full',
						'desc'       => sprintf( __( 'Paste the url for a SoundCloud or Spotify song or a hosted audio file. For a full list of supported providers see %s.', 'lifterlms' ), '<a href="https://wordpress.org/documentation/article/embeds/#list-of-sites-you-can-embed-from" target="_blank">WordPress oEmbeds</a>' ),
						'desc_class' => 'd-all',
						'id'         => $this->prefix . 'audio_embed',
						'type'       => 'text',
						'label'      => __( 'Audio Embed Url', 'lifterlms' ),
					),
					array(
						'class'         => '',
						'desc'          => __( 'Checking this box will allow guests to view the content of this lesson without registering or signing up for the course.', 'lifterlms' ),
						'desc_class'    => 'd-3of4 t-3of4 m-1of2',
						'id'            => $this->prefix . 'free_lesson',
						'is_controller' => true,
						'label'         => __( 'Free Lesson', 'lifterlms' ),
						'type'          => 'checkbox',
						'value'         => 'yes',
					),
				),
			),
			array(
				'title'  => __( 'Prerequisites', 'lifterlms' ),
				'fields' => array(
					array(
						'class'      => '',
						'controls'   => '#' . $this->prefix . 'prerequisite',
						'desc'       => __( 'Enable to choose a prerequisite Lesson', 'lifterlms' ),
						'desc_class' => 'd-3of4 t-3of4 m-1of2',
						'id'         => $this->prefix . 'has_prerequisite',
						'label'      => __( 'Enable Prerequisite', 'lifterlms' ),
						'type'       => 'checkbox',
						'value'      => 'yes',
					),
					array(
						'class'           => 'llms-select2-post',
						'data_attributes' => array(
							'allow-clear' => true,
							'placeholder' => __( 'Select a Prerequisite Lesson', 'lifterlms' ),
							'post-type'   => 'lesson',
						),
						'desc'            => __( 'Select the prerequisite lesson', 'lifterlms' ),
						'desc_class'      => 'd-all',
						'id'              => $this->prefix . 'prerequisite',
						'label'           => __( 'Choose Prerequisite', 'lifterlms' ),
						'type'            => 'select',
						'value'           => llms_make_select2_post_array( array( get_post_meta( $this->post->ID, $this->prefix . 'prerequisite', true ) ) ),
					),
				),
			),
			array(
				'title'  => __( 'Drip Settings', 'lifterlms' ),
				'fields' => array(
					array(
						'class'         => 'llms-select2',
						'desc_class'    => 'd-all',
						'id'            => $this->prefix . 'drip_method',
						'is_controller' => true,
						'label'         => __( 'Method', 'lifterlms' ),
						'type'          => 'select',
						'value'         => $methods,
					),
					array(
						'controller'       => '#' . $this->prefix . 'drip_method',
						'controller_value' => 'lesson,enrollment,start,prerequisite',
						'class'            => 'input-full',
						'id'               => $this->prefix . 'days_before_available',
						'label'            => __( 'Delay (in days) ', 'lifterlms' ),
						'type'             => 'number',
						'step'             => 1,
						'min'              => 0,
					),
					array(
						'controller'       => '#' . $this->prefix . 'drip_method',
						'controller_value' => 'date',
						'class'            => 'llms-datepicker',
						'id'               => $this->prefix . 'date_available',
						'label'            => __( 'Date Available', 'lifterlms' ),
						'type'             => 'date',
					),
					array(
						'controller'       => '#' . $this->prefix . 'drip_method',
						'controller_value' => 'date',
						'class'            => '',
						'desc'             => __( 'Optionally enter a time when the lesson should become available. If no time supplied, lesson will be available at 12:00 AM. Format must be HH:MM AM', 'lifterlms' ),
						'id'               => $this->prefix . 'time_available',
						'label'            => __( 'Time Available', 'lifterlms' ),
						'type'             => 'text',
					),
				),
			),
			array(
				'title'  => __( 'Quiz', 'lifterlms' ),
				'fields' => array(
					array(
						'controller'       => '#' . $this->prefix . 'free_lesson',
						'controller_value' => 'false',
						'desc'             => __( 'Checking this box will require students to get a passing score on the above quiz to complete the lesson.', 'lifterlms' ),
						'desc_class'       => 'd-3of4 t-3of4 m-1of2',
						'id'               => $this->prefix . 'require_passing_grade',
						'label'            => __( 'Require Passing Grade', 'lifterlms' ),
						'type'             => 'checkbox',
						'value'            => 'yes',
					),
				),
			),