Inventory_Presser_Photo_Numberer::maybe_number_photo( int $post_id )

	public static function maybe_number_photo( $post_id ) {
		// Is this new attachment even attached to a post?
		$attachment = get_post( $post_id );
		if ( empty( $attachment->post_parent ) ) {
			// No
			return;
		}

		$parent = get_post( $attachment->post_parent );

		// Is this even attached to a vehicle?
		if ( empty( $parent ) || INVP::POST_TYPE != $parent->post_type ) {
			// No
			return;
		}

		// Save the VIN in the photo meta
		self::save_meta_vin( $post_id, $attachment->post_parent );

		// Save a md5 hash checksum of the attachment in meta
		self::save_meta_hash( $post_id );

		// Assign and save a sequence number for the photo like 1, 2, 3, etc
		self::save_meta_photo_number( $post_id, $attachment->post_parent );
	}