public function generate_product_data( $product = null ) {
		if ( ! is_object( $product ) ) {
			global $product;
		}

		if ( ! is_a( $product, 'WC_Product' ) ) {
			return;
		}

		$shop_name = get_bloginfo( 'name' );
		$shop_url  = home_url();
		$currency  = get_woocommerce_currency();
		$permalink = get_permalink( $product->get_id() );
		$image     = wp_get_attachment_url( $product->get_image_id() );

		$markup = array(
			'@type'       => 'Product',
			'@id'         => $permalink . '#product', // Append '#product' to differentiate between this @id and the @id generated for the Breadcrumblist.
			'name'        => $product->get_name(),
			'url'         => $permalink,
			'description' => wp_strip_all_tags( do_shortcode( $product->get_short_description() ? $product->get_short_description() : $product->get_description() ) ),
		);

		if ( $image ) {
			$markup['image'] = $image;
		}

		// Declare SKU or fallback to ID.
		if ( $product->get_sku() ) {
			$markup['sku'] = $product->get_sku();
		} else {
			$markup['sku'] = $product->get_id();
		}

		if ( '' !== $product->get_price() ) {
			// Assume prices will be valid until the end of next year, unless on sale and there is an end date.
			$price_valid_until = date( 'Y-12-31', time() + YEAR_IN_SECONDS );

			if ( $product->is_type( 'variable' ) ) {
				$lowest  = $product->get_variation_price( 'min', false );
				$highest = $product->get_variation_price( 'max', false );

				if ( $lowest === $highest ) {
					$markup_offer = array(
						'@type'              => 'Offer',
						'price'              => wc_format_decimal( $lowest, wc_get_price_decimals() ),
						'priceValidUntil'    => $price_valid_until,
						'priceSpecification' => array(
							'price'                 => wc_format_decimal( $lowest, wc_get_price_decimals() ),
							'priceCurrency'         => $currency,
							'valueAddedTaxIncluded' => wc_prices_include_tax() ? 'true' : 'false',
						),
					);
				} else {
					$markup_offer = array(
						'@type'      => 'AggregateOffer',
						'lowPrice'   => wc_format_decimal( $lowest, wc_get_price_decimals() ),
						'highPrice'  => wc_format_decimal( $highest, wc_get_price_decimals() ),
						'offerCount' => count( $product->get_children() ),
					);
				}
			} else {
				if ( $product->is_on_sale() && $product->get_date_on_sale_to() ) {
					$price_valid_until = date( 'Y-m-d', $product->get_date_on_sale_to()->getTimestamp() );
				}
				$markup_offer = array(
					'@type'              => 'Offer',
					'price'              => wc_format_decimal( $product->get_price(), wc_get_price_decimals() ),
					'priceValidUntil'    => $price_valid_until,
					'priceSpecification' => array(
						'price'                 => wc_format_decimal( $product->get_price(), wc_get_price_decimals() ),
						'priceCurrency'         => $currency,
						'valueAddedTaxIncluded' => wc_prices_include_tax() ? 'true' : 'false',
					),
				);
			}

			$markup_offer += array(
				'priceCurrency' => $currency,
				'availability'  => 'http://schema.org/' . ( $product->is_in_stock() ? 'InStock' : 'OutOfStock' ),
				'url'           => $permalink,
				'seller'        => array(
					'@type' => 'Organization',
					'name'  => $shop_name,
					'url'   => $shop_url,
				),
			);

			$markup['offers'] = array( apply_filters( 'woocommerce_structured_data_product_offer', $markup_offer, $product ) );
		}

		if ( $product->get_rating_count() && wc_review_ratings_enabled() ) {
			$markup['aggregateRating'] = array(
				'@type'       => 'AggregateRating',
				'ratingValue' => $product->get_average_rating(),
				'reviewCount' => $product->get_review_count(),
			);

			// Markup 5 most recent rating/review.
			$comments = get_comments(
				array(
					'number'      => 5,
					'post_id'     => $product->get_id(),
					'status'      => 'approve',
					'post_status' => 'publish',
					'post_type'   => 'product',
					'parent'      => 0,
					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
						array(
							'key'     => 'rating',
							'type'    => 'NUMERIC',
							'compare' => '>',
							'value'   => 0,
						),
					),
				)
			);

			if ( $comments ) {
				$markup['review'] = array();
				foreach ( $comments as $comment ) {
					$markup['review'][] = array(
						'@type'         => 'Review',
						'reviewRating'  => array(
							'@type'       => 'Rating',
							'bestRating'  => '5',
							'ratingValue' => get_comment_meta( $comment->comment_ID, 'rating', true ),
							'worstRating' => '1',
						),
						'author'        => array(
							'@type' => 'Person',
							'name'  => get_comment_author( $comment ),
						),
						'reviewBody'    => get_comment_text( $comment ),
						'datePublished' => get_comment_date( 'c', $comment ),
					);
				}
			}
		}

		// Check we have required data.
		if ( empty( $markup['aggregateRating'] ) && empty( $markup['offers'] ) && empty( $markup['review'] ) ) {
			return;
		}

		$this->set_data( apply_filters( 'woocommerce_structured_data_product', $markup, $product ) );
	}