<?php
/**
 * VideoObject.
 *
 * @package ElevenRank
 * @since   1.0.0
 */

namespace ElevenRank\Modules\Schema;

use WP_Post;

defined( 'ABSPATH' ) || exit;

/**
 * A video needs a name, a thumbnail and an upload date (Google's Video rules). The upload date is
 * never guessed from the date of the post.
 *
 * @since 1.0.0
 */
final class Video_Node extends Content_Node {

	/**
	 * Builds the node.
	 *
	 * @since 1.0.0
	 *
	 * @param string               $type   VideoObject.
	 * @param array<string, mixed> $fields Field values.
	 * @param WP_Post              $post   The post.
	 * @param Node_Context         $c      Page information.
	 * @param Graph                $graph  The graph.
	 * @return array<string, mixed>|null
	 */
	public function build( string $type, array $fields, WP_Post $post, Node_Context $c, Graph $graph ): ?array {
		$name      = $this->text( $fields, 'name', $this->title( $post ) );
		$thumbnail = $this->image_url( $fields, 'thumbnail', $post );
		$uploaded  = $this->text( $fields, 'upload_date' );

		if ( '' === $name || '' === $thumbnail || '' === $uploaded ) {
			return null;
		}

		return array(
			'@type'            => 'VideoObject',
			'@id'              => $c->id( 'video' ),
			'mainEntityOfPage' => array( '@id' => $c->id( 'webpage' ) ),
			'name'             => $name,
			'description'      => $this->text( $fields, 'description', $this->description( $post, $c ) ),
			'thumbnailUrl'     => array( $thumbnail ),
			'uploadDate'       => $uploaded,
			'contentUrl'       => $this->text( $fields, 'content_url' ),
			'embedUrl'         => $this->text( $fields, 'embed_url' ),
			'duration'         => Field_Values::duration_from_seconds( (int) $this->text( $fields, 'duration' ) ),
		);
	}
}