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File: //proc/self/cwd/wp-content/plugins/woocommerce-square/includes/Handlers/Product.php
<?php
/**
 * WooCommerce Square
 *
 * This source file is subject to the GNU General Public License v3.0
 * that is bundled with this package in the file license.txt.
 * It is also available through the world-wide-web at this URL:
 * http://www.gnu.org/licenses/gpl-3.0.html GNU General Public License v3.0 or later
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@woocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade WooCommerce Square to newer
 * versions in the future. If you wish to customize WooCommerce Square for your
 * needs please refer to https://docs.woocommerce.com/document/woocommerce-square/
 *
 * @author    WooCommerce
 * @copyright Copyright: (c) 2019, Automattic, Inc.
 * @license   http://www.gnu.org/licenses/gpl-3.0.html GNU General Public License v3.0 or later
 */

namespace WooCommerce\Square\Handlers;

use Square\Models\BatchRetrieveCatalogObjectsResponse;
use WooCommerce\Square\Utilities\Money_Utility;
use WooCommerce\Square\Sync\Records;
use WooCommerce\Square\Sync\Helper;

defined( 'ABSPATH' ) || exit;

/**
 * Product handler class.
 *
 * @since 2.0.0
 */
class Product {


	/**
	 * Meta key to store the taxonomy name that flags whether a product
	 * is marked as 'synced' with Square
	 * @var string
	 **/
	const SYNCED_WITH_SQUARE_TAXONOMY = 'wc_square_synced';

	/**
	 * Meta key to store catalog object ID.
	 *
	 * @var string
	 */
	const SQUARE_ID_META_KEY = '_square_item_id';

	/**
	 * Meta key to store version of a catalog object.
	 *
	 * @var string
	 */
	const SQUARE_VERSION_META_KEY = '_square_item_version';

	/**
	 * Meta key to store version of a catalog object variation.
	 *
	 * @var string
	 */
	const SQUARE_VARIATION_ID_META_KEY = '_square_item_variation_id';

	/**
	 * Meta key to store version of a catalog object variation.
	 *
	 * @var string
	 */
	const SQUARE_VARIATION_VERSION_META_KEY = '_square_item_variation_version';

	/**
	 * Meta key to store catalog object thumbnail ID.
	 *
	 * @var string
	 **/
	const SQUARE_IMAGE_ID_META_KEY = '_square_item_image_id';

	/**
	 * Meta key used to identify whether a product is a gift card.
	 *
	 * @var string
	 */
	const SQUARE_GIFT_CARD_KEY = '_square_gift_card';

	/**
	 * @param \WC_Product $product
	 * @param \Square\Models\CatalogObject $catalog_object
	 */
	public static function update_product( \WC_Product $product, \Square\Models\CatalogObject $catalog_object ) {

		if ( 'ITEM' !== $catalog_object->getType() || ! $catalog_object->getItemData() ) {
			throw new \InvalidArgumentException( 'Type of $catalog_object must be an ITEM' );
		}

		$product->update_meta_data( self::SQUARE_ID_META_KEY, $catalog_object->getId() );
		$product->update_meta_data( self::SQUARE_VERSION_META_KEY, $catalog_object->getVersion() );
		$product->update_meta_data( self::SQUARE_IMAGE_ID_META_KEY, self::get_catalog_item_thumbnail_id( $catalog_object ) );

		$product->save();
	}


	/**
	 * @param \WC_Product $product
	 * @param \Square\Models\CatalogObject $catalog_object
	 */
	public static function update_variation( \WC_Product $product, \Square\Models\CatalogObject $catalog_object ) {

		if ( 'ITEM_VARIATION' !== $catalog_object->getType() || ! $catalog_object->getItemVariationData() ) {
			throw new \InvalidArgumentException( 'Type of $catalog_object must be an ITEM_VARIATION' );
		}

		$product->update_meta_data( self::SQUARE_VARIATION_ID_META_KEY, $catalog_object->getId() );
		$product->update_meta_data( self::SQUARE_VARIATION_VERSION_META_KEY, $catalog_object->getVersion() );

		$product->save();
	}

	/**
	 * Updates a WooCommerce product from Square data.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product $product product object
	 * @param \Square\Models\CatalogItem $catalog_item Square API catalog item data
	 * @param bool $with_inventory whether to pull the latest product inventory from Square
	 * @throws \Exception
	 */
	public static function update_from_square( \WC_Product $product, \Square\Models\CatalogItem $catalog_item, $with_inventory = true ) {

		$catalog_id         = null;
		$catalog_variations = $catalog_item->getVariations();

		if ( $product instanceof \WC_Product_Variable ) {

			foreach ( $catalog_variations as $catalog_variation ) {

				// sanity check to ensure the correct data structure
				if ( ! $catalog_variation->getItemVariationData() instanceof \Square\Models\CatalogItemVariation ) {
					continue;
				}

				$catalog_id = $catalog_variation->getItemVariationData()->getItemId();
				$variation  = wc_get_product( wc_get_product_id_by_sku( $catalog_variation->getItemVariationData()->getSku() ) );
				if ( $variation ) {

					if ( ! $variation instanceof \WC_Product_Variation || $variation->get_parent_id() !== $product->get_id() ) {
						continue;
					}

					$variation->update_meta_data( self::SQUARE_VARIATION_ID_META_KEY, $catalog_variation->getId() );

					self::update_price_money( $variation, $catalog_variation );

					if ( $with_inventory && wc_square()->get_settings_handler()->is_inventory_sync_enabled() ) {
						self::update_stock_from_square( $variation, false );
					}

					$variation->save();

					/**
					 * Fires after updating a WooCommerce variation product from Square data.
					 *
					 * @since 2.0.0
					 *
					 * @param \WC_Product_Variation $variation variation object
					 * @param \Square\Models\CatalogItemVariation $catalog_variation Square API catalog variation item object
					 */
					do_action( 'wc_square_updated_product_variation_from_square', $variation, $catalog_variation );
				}
			}
		} else {

			$catalog_variation = current( $catalog_variations );

			if ( $product->get_sku() !== $catalog_variation->getItemVariationData()->getSku() ) {
				throw new \Exception( 'The WooCommerce SKU and Square SKU do not match' );
			}

			$catalog_id = $catalog_variation->getItemVariationData()->getItemId();

			$product->update_meta_data( self::SQUARE_VARIATION_ID_META_KEY, $catalog_variation->getId() );

			self::update_price_money( $product, $catalog_variation );

			if ( $with_inventory && wc_square()->get_settings_handler()->is_inventory_sync_enabled() ) {
				self::update_stock_from_square( $product, false );
			}
		}

		/**
		 * Allow overriding product name during import from Square
		 *
		 * @since 3.3.0
		 *
		 * @param string                           $product_name Product name to update.
		 * @param \SquareConnect\Model\CatalogItem $catalog_item Catalog item being imported.
		 * @param \WC_Product                      $product Product being updated.
		 * @return false|string String to override the product name, false to disable updating
		 *                      and keep existing name.
		 * @since 3.3.0
		 */
		$product_name = apply_filters( 'wc_square_update_product_set_name', $catalog_item->getName(), $catalog_item, $product );
		if ( false !== $product_name ) {
			$product->set_name( wc_clean( $product_name ) );
		}

		$product_description = self::get_catalog_item_description( $catalog_item );

		/**
		 * Allow overriding product description during import from Square
		 *
		 * @since 3.3.0
		 *
		 * @param string                           $product_description Product description to update.
		 * @param \SquareConnect\Model\CatalogItem $catalog_item Catalog item being imported.
		 * @param \WC_Product                      $product Product being updated.
		 *
		 * @return false|string String to override the product description, false to disable updating
		 *                      and keep existing description.
		 * @since 3.3.0
		 */
		$product_description = apply_filters( 'wc_square_update_product_set_description', $product_description, $catalog_item, $product );
		if ( false !== $product_description ) {
			$product->set_description( $product_description );
		}

		$square_category_id = Category::get_square_category_id( $catalog_item );
		$category_id        = Category::get_category_id_by_square_id( $square_category_id );

		if ( $category_id ) {
			wp_set_object_terms( $product->get_id(), intval( $category_id ), 'product_cat' );
		} else {
			$message = sprintf(
				/* translators: Placeholder: %s category ID */
				__( 'Square category with id (%s) was not imported to your Store. Please run Import Products from Square settings.', 'woocommerce-square' ),
				$square_category_id
			);

			$records = Records::get_records();
			foreach ( $records as $record ) {
				if ( $record->get_message() === $message ) {
					$is_recorded = true;
				}
			}

			if ( ! isset( $is_recorded ) ) {
				Records::set_record(
					array(
						'type'    => 'alert',
						'message' => $message,
					)
				);
			}
		}

		if ( $catalog_id ) {
			$product->update_meta_data( self::SQUARE_ID_META_KEY, $catalog_id );
		}

		$product->save();

		/**
		 * Fires after updating a WooCommerce product from Square data.
		 *
		 * @since 2.0.0
		 *
		 * @param \WC_Product $product product object
		 * @param \Square\Models\CatalogItem $catalog_item Square API catalog item object
		 */
		do_action( 'wc_square_updated_product_from_square', $product, $catalog_item );
	}

	/**
	 * Returns description of a catalog item.
	 *
	 * @since 3.9.1
	 *
	 * @param \Square\Models\CatalogItem $catalog_item
	 * @return string
	 */
	public static function get_catalog_item_description( $catalog_item ) {
		/**
		 * Filter to import HTML description with HTML.
		 * Enabled by default.
		 *
		 * @since 3.9.1
		 *
		 * @param boolean 'is_enabled' Boolean to toggle support for HTML descriptions.
		 */
		if ( apply_filters( 'wc_square_enable_html_description', true ) ) {
			$product_description = wp_specialchars_decode( $catalog_item->getDescriptionHtml() );
		} else {
			// For some reason, `getDescriptionPlaintext` returns description with HTML.
			// We use wp_strip_all_tags to strip HTML and preserve white spaces.
			// Not sure if this is a bug.
			$product_description = wp_strip_all_tags( $catalog_item->getDescriptionPlaintext() );
		}

		return $product_description;
	}


	/**
	 * Updates a product image from a URL provided by Square (helper method).
	 *
	 * Note: does not save the product for persistence. If opening to public, consider changing this behavior.
	 *       This function handles its own exceptions and logs them.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product|int $given_product product object or product ID
	 * @param string $image_id
	 * @param bool $force_update If true, always import and update the product image from Square. If false, check if the image already exists on the given product before uploading a possible
	 * @todo Look at ussages of this function. Does it even need to return anything?
	 * @return \WC_Product|int The product id of object that was passed in.
	 */
	public static function update_image_from_square( $given_product, $image_id, $force_update = false ) {

		$product        = is_numeric( $given_product ) ? wc_get_product( $given_product ) : $given_product;
		$image_override = wc_square()->get_settings_handler()->is_override_product_images_enabled() || $force_update;
		$image_url      = '';

		if ( ! $product instanceof \WC_Product ) {
			wc_square()->log( sprintf( 'Could not import image from Square for attaching to product: Invalid product.' ) );
			return $given_product;
		}

		try {
			if ( ! function_exists( 'media_sideload_image' ) ) {
				require_once ABSPATH . 'wp-admin/includes/media.php';
				require_once ABSPATH . 'wp-admin/includes/file.php';
				require_once ABSPATH . 'wp-admin/includes/image.php';
			}

			$product_image_id = $product->get_image_id();

			/**
			 * If WooCommerce product has an image but Square product doesn't, then
			 * delete `_square_item_image_id` meta.
			 */
			if ( $product_image_id && ! $image_id && $image_override ) {
				$product->delete_meta_data( '_square_item_image_id' );
				$product->set_image_id( '' );
			} elseif ( $image_override && $image_id ) {
				$old_square_image_id = $product->get_meta( '_square_item_image_id' );
				$image_response      = wc_square()->get_api()->retrieve_catalog_object( $image_id );
				$image_url           = $image_response->get_data()->getObject()->getImageData()->getUrl();

				if ( $old_square_image_id !== $image_id ) {
					// grab remote image to upload into WordPress before attaching to product
					$attachment_id = media_sideload_image( $image_url, $product->get_id(), $product->get_title(), 'id' );

					if ( is_wp_error( $attachment_id ) ) {
						throw new \Exception( $attachment_id->get_error_message() );
					}

					self::set_square_image_id( $product, $image_id );

					// attach the newly updated image to product
					$product->set_image_id( $attachment_id );
				}
			}

			$product->save();

			// if the product has an image but doesn't have any Square image ID meta set, check we're not uploading a duplicate image src from Square
			if ( ! $force_update && $product_image_id && ! $product->get_meta( '_square_item_image_id' ) ) {
				$product_image_src = get_post_meta( $product_image_id, '_source_url', true );

				if ( empty( $product_image_src ) ) {
					throw new \Exception( 'Cannot compare existing product image src with new upload. Exiting to avoid uploading duplicate' );
				} elseif ( $product_image_src === $image_url ) {
					$product->update_meta_data( '_square_item_image_id', $image_id );
					throw new \Exception( 'This image has already been uploaded to WordPress and is now set on the product' );
				}
			}

			return $product;
		} catch ( \Exception $e ) {
			/* Translators: Placeholder: %1$s - product ID, %2$s - Exception message */
			$message = sprintf( esc_html__( 'Image not updated from Square for product #%1$s. %2$s.', 'woocommerce-square' ), $product->get_id(), $e->getMessage() );

			wc_square()->log( $message );
			Records::set_record(
				array(
					'type'    => 'alert',
					'message' => $message,
				)
			);
		}

		$product->save();

		return $product;
	}


	/**
	 * Updates a product's stock by getting the latest values from Square.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product $product product object
	 * @param bool $save whether to save the product object
	 * @return \WC_Product
	 * @throws \Exception
	 */
	public static function update_stock_from_square( \WC_Product $product, $save = true ) {

		$square_id = $product->get_meta( self::SQUARE_VARIATION_ID_META_KEY );

		if ( ! $square_id ) {
			throw new \Exception( esc_html__( 'Product not synced with Square', 'woocommerce-square' ) );
		}

		// if saving the product, flag as syncing so updating the stock won't trigger another sync
		if ( $save && ( ! defined( 'DOING_SQUARE_SYNC' ) || false === DOING_SQUARE_SYNC ) ) {
			define( 'DOING_SQUARE_SYNC', true );
		}

		$response = wc_square()->get_api()->retrieve_inventory_count( $square_id );
		$result   = wc_square()->get_api()->retrieve_catalog_object( $square_id );
		if ( ! $result->get_data() || ! $result->get_data()->getObject() ) {
			throw new \Exception( 'No object data present' );
		}
		$inventory_tracking = Helper::get_catalog_inventory_tracking( array( $result->get_data()->getObject() ) );

		$stock = 0;

		if ( $response->get_data() && $response->get_data()->getCounts() ) {

			/** @var \Square\Models\InventoryCount $count */
			foreach ( $response->get_data()->getCounts() as $count ) {

				if ( 'IN_STOCK' === $count->getState() ) {
					$stock += (float) $count->getQuantity();
				}
			}
		}

		$inventory_tracking_data = $inventory_tracking[ $square_id ] ?? array();
		$is_inventory_tracking   = $inventory_tracking_data['track_inventory'] ?? true;
		$sold_out                = $inventory_tracking_data['sold_out'] ?? false;

		if ( $is_inventory_tracking ) {
			$product->set_manage_stock( true );
			$product->set_stock_quantity( $stock );
		} else {
			$product->set_stock_status( $sold_out ? 'outofstock' : 'instock' );
			$product->set_manage_stock( false );
		}

		if ( $save ) {
			$product->save();
		}

		return $product;
	}

	/**
	 * Updates a product's stock by getting the latest values from Square.
	 *
	 * @since 4.1.0
	 *
	 * @param int[] $product_ids Product IDs.
	 * @param bool  $save        Whether to save the product object.
	 * @return void
	 * @throws \Exception
	 */
	public static function update_products_stock_from_square( $product_ids ) {
		$products_map = self::get_square_meta( $product_ids, 'square_item_variation_id' );
		$square_ids   = array_keys( $products_map );

		if ( empty( $square_ids ) ) {
			return;
		}

		// Flag as syncing so updating the stock won't trigger another sync
		if ( ! defined( 'DOING_SQUARE_SYNC' ) || false === DOING_SQUARE_SYNC ) {
			define( 'DOING_SQUARE_SYNC', true );
		}

		$response = wc_square()->get_api()->batch_retrieve_catalog_objects( $square_ids );
		if ( ! $response->get_data() instanceof BatchRetrieveCatalogObjectsResponse ) {
			throw new \Exception( 'Response data is missing' );
		}

		if ( is_array( $response->get_data()->getObjects() ) ) {
			$inventory_hash     = Helper::get_catalog_objects_inventory_stats( $square_ids );
			$inventory_tracking = Helper::get_catalog_inventory_tracking( $response->get_data()->getObjects() );

			foreach ( $response->get_data()->getObjects() as $catalog_object ) {
				$square_id               = $catalog_object->getId();
				$stock                   = $inventory_hash[ $square_id ] ?? 0;
				$inventory_tracking_data = $inventory_tracking[ $square_id ] ?? array();
				$is_inventory_tracking   = $inventory_tracking_data['track_inventory'] ?? true;
				$sold_out                = $inventory_tracking_data['sold_out'] ?? false;

				$product_id = $products_map[ $square_id ]['product_id'];
				$product    = wc_get_product( $product_id );

				if ( ! $product ) {
					continue;
				}

				if ( $is_inventory_tracking ) {
					$product->set_manage_stock( true );
					$product->set_stock_quantity( $stock );
				} else {
					$product->set_stock_status( $sold_out ? 'outofstock' : 'instock' );
					$product->set_manage_stock( false );
				}

				$product->save();
			}
		}
	}

	/**
	 * Initializes custom product taxonomies.
	 *
	 * @since 2.0.0
	 */
	public static function init_taxonomies() {

		register_taxonomy(
			self::SYNCED_WITH_SQUARE_TAXONOMY,
			array( 'product' ),
			array(
				'hierarchical'          => false,
				'update_count_callback' => '_update_generic_term_count',
				'show_ui'               => false,
				'show_in_nav_menus'     => false,
				'query_var'             => is_admin(),
				'rewrite'               => false,
			)
		);
	}


	/**
	 * Sets a product's synced with Square status.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product|int $product a valid product object or product ID
	 * @param string $synced either 'yes' (default) or 'no'
	 * @return bool
	 */
	public static function set_synced_with_square( $product, $synced = 'yes' ) {

		$product = is_numeric( $product ) ? wc_get_product( $product ) : $product;

		if ( ! $product instanceof \WC_Product || ! in_array( $synced, array( 'yes', 'no' ), true ) ) {
			return false;
		}

		// ensure only one term is associated with the product at any time
		wp_delete_object_term_relationships( $product->get_id(), array( self::SYNCED_WITH_SQUARE_TAXONOMY ) );

		// we have already set the value to "no" above by deleting the term relationship
		// so it is safe to return with true.
		if ( 'no' === $synced ) {
			return true;
		}

		$set_term = wp_set_post_terms( $product->get_id(), array( $synced ), self::SYNCED_WITH_SQUARE_TAXONOMY );
		$success  = is_array( $set_term );

		if ( wc_square()->get_settings_handler()->is_inventory_sync_enabled() && 'external' !== $product->get_type() ) {
			// Trigger a sync inventory from Woo to Square if product stock is updated from admin.
			$product->save();
		}

		return $success;
	}


	/**
	 * Removes a product flag from being synced with Square.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product $product a valid product object
	 * @return bool
	 */
	public static function unset_synced_with_square( $product ) {

		return self::set_synced_with_square( $product, 'no' );
	}


	/**
	 * Determines whether a product is set to be synced with Square.
	 *
	 * @since 2.0.0
	 *
	 * @param false|\WC_Product $product a valid product object
	 * @return bool
	 */
	public static function is_synced_with_square( $product ) {

		if ( $product instanceof \WC_Product ) {

			// if this is a variation, check its parent.
			$parent_product = wc_get_product( $product->get_parent_id() );

			if ( $parent_product instanceof \WC_Product ) {
				$product = $parent_product;
			}

			$terms = wp_get_post_terms( $product->get_id(), self::SYNCED_WITH_SQUARE_TAXONOMY, array( 'fields' => 'names' ) );
		}

		return ! empty( $terms ) && 'yes' === $terms[0];
	}


	/**
	 * Determines if a product can be synced with Square.
	 *
	 * SKUs and single-dimension attributes are required, so this helps us validate that in case a product has been
	 * marked as "Sync with Square" manually.
	 *
	 * @since 2.0.2
	 *
	 * @param \WC_Product $product product object
	 * @return bool
	 */
	public static function can_sync_with_square( \WC_Product $product ) {

		$can_sync = self::has_sku( $product );

		if ( $can_sync && $product->is_type( 'variable' ) ) {
			$can_sync = ! self::has_multiple_variation_attributes( $product );
		}

		/**
		 * Hook to filter whether a product can sync with Square.
		 *
		 * @since 2.0.2
		 *
		 * @param boolean     $can_sync Boolean to set if product can sync with Square.
		 * @param \WC_Product $product  WooCommerce product.
		 */
		return (bool) apply_filters( 'wc_square_product_can_sync_with_square', $can_sync, $product );
	}

	/**
	 * Return a link to the product's edit page
	 *
	 * @since 2.0.8
	 *
	 * @param \WC_Product $product product object
	 * @return string
	 */
	public static function get_product_edit_link( \WC_Product $product ) {
		return '<a href="' . esc_url( get_edit_post_link( $product->get_id() ) ) . '">' . esc_html( $product->get_formatted_name() ) . '</a>';
	}

	/**
	 * Determines if a product has a SKU set.
	 *
	 * For variable products, this checks if all of its variations have a SKU.
	 *
	 * @since 2.0.2
	 *
	 * @param \WC_Product $product product object
	 * @return bool
	 */
	public static function has_sku( \WC_Product $product ) {
		if ( $product->is_type( 'variable' ) && $product->has_child() ) {
			foreach ( $product->get_children() as $variation_id ) {
				$variation = wc_get_product( $variation_id );

				if ( $variation instanceof \WC_Product && empty( $variation->get_sku( 'edit' ) ) ) {
					return false;
				}
			}
			return true;
		}

		return ! empty( $product->get_sku() );
	}


	/**
	 * Determines if a product has multiple variation attributes.
	 *
	 * @since 2.0.2
	 *
	 * @param \WC_Product $product product object
	 * @return bool
	 */
	public static function has_multiple_variation_attributes( \WC_Product $product ) {

		$has_attributes = false;

		if ( $product->is_type( 'variable' ) ) {

			$variation_attributes = array();

			foreach ( $product->get_attributes() as $attribute ) {

				if ( $attribute instanceof \WC_Product_Attribute && $attribute->get_variation() ) {
					$variation_attributes[] = $attribute;
				}
			}

			if ( count( $variation_attributes ) > 1 ) {
				$has_attributes = true;
			}
		}

		return $has_attributes;
	}


	/**
	 * Gets an ID list of products that have a synced with Square status set.
	 *
	 * @since 2.0.0
	 *
	 * @param string $status either 'yes' or 'no'
	 * @return int[] array of product IDs
	 */
	private static function get_products_synced_status( $status ) {

		$sync_status_term = get_term_by( 'name', 'yes', self::SYNCED_WITH_SQUARE_TAXONOMY );
		$product_ids      = array();

		if ( $sync_status_term instanceof \WP_Term && in_array( $status, array( 'yes', 'no' ), true ) ) {

			$tax_query_args = array(
				'taxonomy'         => self::SYNCED_WITH_SQUARE_TAXONOMY,
				'field'            => 'id',
				'terms'            => $sync_status_term->term_id,
				'include_children' => false,
			);

			if ( 'no' === $status ) {
				$tax_query_args['operator'] = 'NOT IN';
			}

			$product_ids = get_posts(
				array(
					'post_type'   => array( 'product', 'product_variation' ),
					'post_status' => array( 'private', 'publish' ),
					'fields'      => 'ids',
					'nopaging'    => true,
					'tax_query'   => array( $tax_query_args ), // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_tax_query
				)
			);

		}
		return $product_ids;
	}


	/**
	 * Gets a list of products explicitly not set to be synced with Square.
	 *
	 * @since 2.0.0
	 *
	 * @return int[]
	 */
	public static function get_products_not_synced_with_square() {

		return self::get_products_synced_status( 'no' );
	}


	/**
	 * Gets a list of products that are set to be synced with Square.
	 *
	 * @since 2.0.0
	 *
	 * @return int[] array of product IDs
	 */
	public static function get_products_synced_with_square() {

		return self::get_products_synced_status( 'yes' );
	}


	/**
	 * Gets a product ID from a Square API variation ID.
	 *
	 * @since 2.0.0
	 *
	 * @param string $variation_id Square API variation item ID
	 * @return int|null
	 */
	public static function get_product_id_by_square_variation_id( $variation_id ) {
		global $wpdb;

		return $wpdb->get_var(
			$wpdb->prepare(
				"
				SELECT pm.post_id
				FROM {$wpdb->prefix}postmeta AS pm
				INNER JOIN {$wpdb->prefix}posts AS p ON pm.post_id = p.ID
				WHERE pm.meta_key = %s AND pm.meta_value = %s
				",
				self::SQUARE_VARIATION_ID_META_KEY,
				$variation_id
			)
		);
	}


	/**
	 * Gets a product from a Square API variation ID.
	 *
	 * @since 2.0.0
	 *
	 * @param string $variation_id Square API variation item ID
	 * @return \WC_Product|null
	 */
	public static function get_product_by_square_variation_id( $variation_id ) {

		$product = wc_get_product( self::get_product_id_by_square_variation_id( $variation_id ) );

		if ( ! $product ) {
			$product = null;
		}

		return $product;
	}


	/**
	 * Gets a product ID from a Square API ID.
	 *
	 * @since 2.0.0
	 *
	 * @param string $square_id Square API item ID
	 * @return int|null
	 */
	public static function get_product_id_by_square_id( $square_id ) {
		global $wpdb;

		return $wpdb->get_var(
			$wpdb->prepare(
				"
				SELECT pm.post_id
				FROM {$wpdb->prefix}postmeta AS pm
				INNER JOIN {$wpdb->prefix}posts AS p ON pm.post_id = p.ID
				WHERE pm.meta_key = %s AND pm.meta_value = %s
				",
				self::SQUARE_ID_META_KEY,
				$square_id
			)
		);
	}


	/**
	 * Gets a product from a Square API ID.
	 *
	 * @since 2.0.0
	 *
	 * @param string $square_id Square API item ID
	 * @return \WC_Product|null
	 */
	public static function get_product_by_square_id( $square_id ) {

		$product = wc_get_product( self::get_product_id_by_square_id( $square_id ) );

		// ensure we have a parent product
		if ( ! $product || $product instanceof \WC_Product_Variation ) {
			$product = null;
		}

		return $product;
	}


	/**
	 * Converts a WC_Product to a Square CatalogObject.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product $product
	 * @return null|\Square\Models\CatalogObject
	 */
	public static function convert_to_catalog_object( \WC_Product $product ) {

		if ( ! $product ) {
			return null;
		}

		$parent_id = $product->get_parent_id();

		if ( 0 !== $parent_id ) {
			return self::convert_to_catalog_object( wc_get_product( $parent_id ) );
		}

		$variations = array();

		if ( $product->has_child() ) {

			foreach ( $product->get_children() as $child_product_id ) {

				$child_product = wc_get_product( $child_product_id );

				if ( $child_product ) {
					$variation = self::extract_catalog_item_variation_data( $child_product );

					if ( $variation ) {
						$variations[] = $variation;
					}
				}
			}
		} else {

			$variation  = self::extract_catalog_item_variation_data( $product );
			$variations = $variation ? array( $variation ) : array();
		}

		if ( empty( $variations ) ) {
			return null;
		}

		$catalog_object = new \Square\Models\CatalogObject(
			'ITEM',
			self::get_square_item_id( $product )
		);

		$catalog_object->setVersion( self::get_square_version( $product ) );
		$catalog_object->setPresentAtLocationIds( array( wc_square()->get_settings_handler()->get_location_id() ) );

		$catalog_item = new \Square\Models\CatalogItem();
		$catalog_item->setName( $product->get_name() );
		$catalog_item->setVariations( $variations );

		$catalog_object->setItemData( $catalog_item );

		// TODO: Handle categories

		return $catalog_object;
	}


	/**
	 * Extracts the data for a catalog item from a \WC_Product.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product $product the product object
	 * @param \Square\Models\CatalogItemVariation[] $variations (optional) array of variations to include
	 * @param bool $is_soft_delete whether or not this item data is for a soft-delete
	 * @return array
	 */
	public static function extract_catalog_item_data( \WC_Product $product, array $variations = array(), $is_soft_delete = false ) {

		if ( ! $product ) {
			return null;
		}

		$data = array(
			'type'                    => 'ITEM',
			'id'                      => self::get_square_item_id( $product ),
			'version'                 => self::get_square_version( $product ),
			'present_at_location_ids' => array( wc_square()->get_settings_handler()->get_location_id() ),
			'item_data'               => array(
				'name'       => $product->get_name(),
				'variations' => $variations,
			),
		);

		$square_category_id = 0;

		foreach ( $product->get_category_ids() as $category_id ) {

			$map = Category::get_mapping( $category_id );

			if ( ! empty( $map['square_id'] ) ) {
				$square_category_id = $map['square_id'];
				break;
			}
		}

		// if a category with a Square ID was found
		if ( $square_category_id ) {
			$data['item_data']['category_id'] = $square_category_id;
		}

		if ( $is_soft_delete ) {

			$data['present_at_all_locations'] = false;
			$data['present_at_location_ids']  = array();
		}

		return $data;
	}


	/**
	 * Extracts the data for a catalog item variation from a \WC_Product.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product $product the product to get the variation data for
	 * @param \WC_Product $parent_product (optional) the parent product - prevents additional calls to wc_get_product()
	 * * @param bool $is_soft_delete whether or not this item data is for a soft-delete
	 * @return array
	 */
	public static function extract_catalog_item_variation_data( \WC_Product $product, \WC_Product $parent_product = null, $is_soft_delete = false ) {

		if ( ! $product ) {
			return null;
		}

		$parent_product_id = $product->get_parent_id();

		if ( 0 === $parent_product_id ) {

			$parent_product = $product;

		} elseif ( null === $parent_product || $parent_product_id !== $parent_product->get_id() ) {

			$parent_product = wc_get_product( $parent_product_id );
		}

		if ( $parent_product instanceof \WC_Product ) {

			$item_id = self::get_square_item_id( $parent_product );

			$data = array(
				'type'                => 'ITEM_VARIATION',
				'id'                  => self::get_square_item_variation_id( $product ),
				'version'             => self::get_square_variation_version( $product ),
				'item_variation_data' => array(
					'item_id'         => $item_id,
					'name'            => $product->get_name(),
					'sku'             => $product->get_sku(),
					'pricing_type'    => 'FIXED_PRICING',
					'price_money'     => self::price_to_money( $product->get_regular_price() ),
					'track_inventory' => true,
				),
			);

			if ( $is_soft_delete ) {

				$data['present_at_all_locations'] = false;
				$data['present_at_location_ids']  = array();
			}
		}

		return $data;
	}


	/**
	 * Converts a product price to a Money object.
	 *
	 * @since 2.0.0
	 *
	 * @param int|float $price
	 * @return \Square\Models\Money
	 */
	public static function price_to_money( $price ) {

		return Money_Utility::amount_to_money( $price, get_woocommerce_currency() );
	}


	/**
	 * Returns the square item ID (if known) or generates one based on local data.
	 *
	 * @since 2.0.0
	 *
	 * @param int|\WC_Product $product_id the product ID or product object
	 * @param bool $generate_if_not_found whether a temporary ID should be returned if an ID is not found
	 * @return string
	 */
	public static function get_square_item_id( $product_id, $generate_if_not_found = true ) {

		if ( $product_id instanceof \WC_Product ) {
			$product_id = $product_id->get_id();
		}

		$square_item_id = get_post_meta( $product_id, self::SQUARE_ID_META_KEY, true );
		$square_item_id = $square_item_id ? $square_item_id : null;

		if ( ! $square_item_id && true === $generate_if_not_found ) {

			$square_item_id = '#item_' . $product_id;
		}

		return $square_item_id;
	}


	/**
	 * Sets the Square item ID for a given product.
	 *
	 * @since 2.0.0
	 *
	 * @param int|false|\WC_Product $product the product object or ID
	 * @param string $item_id the Square item ID
	 */
	public static function set_square_item_id( $product, $item_id ) {

		$product = is_numeric( $product ) ? wc_get_product( $product ) : $product;

		if ( $product instanceof \WC_Product ) {

			$product->update_meta_data( self::SQUARE_ID_META_KEY, $item_id );
			$product->save();
		}
	}


	/**
	 * Returns the square item variation ID (if known) or generates one based on local data.
	 *
	 * @since 2.0.0
	 *
	 * @param int|\WC_Product $product_id the product ID or product object
	 * @param bool $generate_if_not_found whether a temporary ID should be returned if an ID is not found
	 * @return string|null
	 */
	public static function get_square_item_variation_id( $product_id, $generate_if_not_found = true ) {

		if ( $product_id instanceof \WC_Product ) {
			$product_id = $product_id->get_id();
		}

		$square_item_variation_id = get_post_meta( $product_id, self::SQUARE_VARIATION_ID_META_KEY, true );
		$square_item_variation_id = $square_item_variation_id ? $square_item_variation_id : null;

		if ( ! $square_item_variation_id && true === $generate_if_not_found ) {

			$square_item_variation_id = '#item_variation_' . $product_id;
		}

		return $square_item_variation_id;
	}


	/**
	 * Sets the Square item variation ID for a given product.
	 *
	 * @since 2.0.0
	 *
	 * @param int|false|\WC_Product $product the product object or ID
	 * @param string $item_variation_id the Square item variation ID
	 */
	public static function set_square_item_variation_id( $product, $item_variation_id ) {

		$product = is_numeric( $product ) ? wc_get_product( $product ) : $product;

		if ( $product instanceof \WC_Product ) {

			$product->update_meta_data( self::SQUARE_VARIATION_ID_META_KEY, $item_variation_id );
			$product->save();
		}
	}


	/**
	 * Returns the Square item version (if known) for the given product.
	 *
	 * @since 2.0.0
	 *
	 * @param int|\WC_Product $product_id the product ID or product object
	 * @return int
	 */
	public static function get_square_version( $product_id ) {

		if ( $product_id instanceof \WC_Product ) {
			$product_id = $product_id->get_id();
		}

		$square_version = get_post_meta( $product_id, self::SQUARE_VERSION_META_KEY, true );

		return $square_version ? (int) $square_version : 0;
	}


	/**
	 * Sets the Square item version for a given product.
	 *
	 * @since 2.0.0
	 *
	 * @param int|false|\WC_Product $product the product object or ID
	 * @param int $version the Square item version
	 */
	public static function set_square_version( $product, $version ) {

		$product = is_numeric( $product ) ? wc_get_product( $product ) : $product;

		if ( $product instanceof \WC_Product ) {

			$product->update_meta_data( self::SQUARE_VERSION_META_KEY, $version );
			$product->save();
		}
	}


	/**
	 * Returns the Square item variation version (if known) for the given product.
	 *
	 * @since 2.0.0
	 *
	 * @param int|\WC_Product $product_id the product ID or product object
	 * @return int
	 */
	public static function get_square_variation_version( $product_id ) {

		if ( $product_id instanceof \WC_Product ) {
			$product_id = $product_id->get_id();
		}

		$square_variation_version = get_post_meta( $product_id, self::SQUARE_VARIATION_VERSION_META_KEY, true );

		return $square_variation_version ? (int) $square_variation_version : 0;
	}


	/**
	 * Sets the Square item ID for a given product.
	 *
	 * @since 2.0.0
	 *
	 * @param int|false|\WC_Product $product the product object or ID
	 * @param int $variation_version the Square item variation version
	 */
	public static function set_square_variation_version( $product, $variation_version ) {

		$product = is_numeric( $product ) ? wc_get_product( $product ) : $product;

		if ( $product instanceof \WC_Product ) {

			$product->update_meta_data( self::SQUARE_VARIATION_VERSION_META_KEY, $variation_version );
			$product->save();
		}
	}


	/**
	 * Gets a product's Square image ID.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product|int $product product object or ID
	 * @return string
	 */
	public static function get_square_image_id( $product ) {

		$image_id = '';

		if ( is_numeric( $product ) ) {
			$product = wc_get_product( $product );
		}

		if ( $product instanceof \WC_Product ) {
			$image_id = $product->get_meta( self::SQUARE_IMAGE_ID_META_KEY );
		}

		return $image_id;
	}


	/**
	 * Sets a product's Square image ID.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product|int $product product object or ID
	 * @param string $image_id Square image ID
	 */
	public static function set_square_image_id( $product, $image_id ) {

		$product = is_numeric( $product ) ? wc_get_product( $product ) : $product;

		if ( $product instanceof \WC_Product ) {

			$product->update_meta_data( self::SQUARE_IMAGE_ID_META_KEY, $image_id );
			$product->save_meta_data();
		}
	}


	/**
	 * Gets all the Square meta data for the given product IDs.
	 *
	 * @see Product::get_square_meta_single()
	 *
	 * @since 2.0.0
	 *
	 * @param int[] $product_ids the product IDs to look up
	 * @param string $array_key the variable to use as the array key in the resulting array
	 * @return array associative array of arrays of data, indexed by $array_key found values (e.g. product ID or square ID, etc.)
	 */
	public static function get_square_meta( $product_ids, $array_key = 'product_id' ) {
		global $wpdb;

		$results = $square_meta = array();

		if ( ! empty( $product_ids ) ) {

			$meta_keys = array(
				'square_item_id'           => self::SQUARE_ID_META_KEY,
				'square_item_variation_id' => self::SQUARE_VARIATION_ID_META_KEY,
				'square_version'           => self::SQUARE_VERSION_META_KEY,
				'square_variation_version' => self::SQUARE_VARIATION_VERSION_META_KEY,
			);

			$array_key   = array_key_exists( $array_key, $meta_keys ) ? $array_key : 'product_id';
			$post_ids_in = '(' . implode( ',', array_map( 'absint', array_merge( array( 0 ), $product_ids ) ) ) . ')';
			$meta_key_in = "('" . self::SQUARE_ID_META_KEY . "','" . self::SQUARE_VARIATION_ID_META_KEY . "','" . self::SQUARE_VERSION_META_KEY . "','" . self::SQUARE_VARIATION_VERSION_META_KEY . "')";
			// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
			$products_meta = $wpdb->get_results(
				"
				SELECT post_id AS product_id, meta_key, meta_value
				FROM $wpdb->postmeta
				WHERE post_id IN $post_ids_in
				AND meta_key IN $meta_key_in
				",
				ARRAY_A
			);
			// phpcs:enable
			foreach ( $products_meta as $post_meta ) {

				if ( ! array_key_exists( (string) $post_meta['product_id'], $square_meta ) ) {
					$square_meta[ (string) $post_meta['product_id'] ] = array(
						'product_id'               => (int) $post_meta['product_id'],
						'square_item_id'           => false,
						'square_item_variation_id' => false,
						'square_version'           => false,
						'square_variation_version' => false,
					);
				}

				foreach ( $meta_keys as $square_meta_key => $post_meta_key ) {
					if ( isset( $post_meta['meta_key'] ) && $post_meta_key === $post_meta['meta_key'] ) {
						$square_meta[ $post_meta['product_id'] ][ $square_meta_key ] = $post_meta['meta_value'];
						break;
					}
				}
			}

			foreach ( $product_ids as $product_id ) {

				// sanity checks: cannot build index without a valid key
				if ( ! array_key_exists( $product_id, $square_meta )
					|| ! isset( $square_meta[ $product_id ][ $array_key ] )
					|| ! $square_meta[ (string) $product_id ][ $array_key ] ) {

					continue;
				}

				$results[ (string) $square_meta[ (string) $product_id ][ $array_key ] ] = $square_meta[ (string) $product_id ];
			}
		}

		return $results;
	}


	/**
	 * Gets all the Square meta data for the given single product ID.
	 *
	 * @see Product::get_square_meta() for getting meta data for all products
	 *
	 * @since 2.0.0
	 *
	 * @param int|\WC_Product $product_id the product ID or object
	 * @return array associative array
	 */
	public static function get_square_meta_single( $product_id ) {

		if ( $product_id instanceof \WC_Product ) {
			$product_id = $product_id->get_id();
		}

		return array(
			'product_id'               => $product_id,
			'square_item_id'           => self::get_square_item_id( $product_id ),
			'square_item_variation_id' => self::get_square_item_variation_id( $product_id ),
			'square_version'           => self::get_square_version( $product_id ),
		);
	}


	/**
	 * Checks if a product is mapped to a Square Item.
	 *
	 * @since 2.0.0
	 *
	 * @param int|\WC_Product $product_id the product ID or product object
	 * @return bool
	 */
	public static function is_mapped( $product_id ) {

		$item_id = self::get_square_item_id( $product_id );

		return ! empty( $item_id ) && false === strpos( $item_id, '#' );
	}


	/**
	 * Updates square meta for a given product ID.
	 *
	 * @since 2.0.0
	 *
	 * @param int|\WC_Product $product_id the product ID or the product object
	 * @param array $meta_data the meta data to update
	 *     @type string $item_id the Square Item ID
	 *     @type int $item_version the Square Item version
	 *     @type string $item_variation_id the Square Item Variation ID
	 *     @type int $item_variation_version the Square Item Variation Version
	 */
	public static function update_square_meta( $product_id, $meta_data ) {

		foreach ( $meta_data as $meta_key => $meta_value ) {

			switch ( $meta_key ) {

				case 'item_id':
					self::set_square_item_id( $product_id, $meta_value );
					break;

				case 'item_version':
					self::set_square_version( $product_id, $meta_value );
					break;

				case 'item_variation_id':
					self::set_square_item_variation_id( $product_id, $meta_value );
					break;

				case 'item_variation_version':
					self::set_square_variation_version( $product_id, $meta_value );
					break;

				case 'item_image_id':
					self::set_square_image_id( $product_id, $meta_value );
					break;
			}
		}
	}


	/**
	 * Clears the Square meta for a given product.
	 *
	 * @since 2.0.0
	 *
	 * @param int[] $product_ids array of product IDs
	 */
	public static function clear_square_meta( $product_ids ) {
		global $wpdb;

		$product_ids = is_array( $product_ids ) ? $product_ids : array( $product_ids );

		$meta_keys = array(
			self::SQUARE_ID_META_KEY,
			self::SQUARE_VERSION_META_KEY,
			self::SQUARE_VARIATION_ID_META_KEY,
			self::SQUARE_VARIATION_VERSION_META_KEY,
			self::SQUARE_IMAGE_ID_META_KEY,
		);

		$meta_key_in = '("' . implode( '","', $meta_keys ) . '")';
		$post_ids_in = '(' . implode( ',', array_map( 'absint', array_merge( array( 0 ), $product_ids ) ) ) . ')';
		// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		$wpdb->query(
			"
			UPDATE $wpdb->postmeta
			SET meta_value = ''
			WHERE meta_key IN $meta_key_in
			AND post_id IN $post_ids_in;
			"
		);
		// phpcs:enable
	}


	/**
	 * Imports meta data from a remote product to the given local product ID.
	 *
	 * @since 2.0.0
	 *
	 * @param int|false|\WC_Product $product the product object or ID
	 * @param \Square\Models\CatalogObject $remote_product the remote catalog object
	 */
	public static function import_remote_meta( $product, $remote_product ) {

		$product   = is_numeric( $product ) ? wc_get_product( $product ) : $product;
		$item_data = $remote_product->getItemData();
		$image_ids = $item_data->getImageIds();

		if ( $product ) {

			self::update_square_meta(
				$product->get_id(),
				array(
					'item_id'       => $remote_product->getId(),
					'item_version'  => $remote_product->getVersion(),
					'item_image_id' => self::get_catalog_item_thumbnail_id( $remote_product ),
				)
			);
		}
	}

	/**
	 * Returns the thumbnail ID of a CatalogItem.
	 *
	 * @param \Square\Models\CatalogObject $catalog_object
	 * @return string
	 */
	public static function get_catalog_item_thumbnail_id( $catalog_object ) {
		$catalog_item = $catalog_object->getItemData();
		$image_ids    = $catalog_item->getImageIds();

		if ( is_array( $image_ids ) && count( $image_ids ) > 0 ) {
			return $image_ids[0];
		}

		return '';
	}


	/**
	 * Gets an InventoryChange object filled with a \Square\Models\InventoryPhysicalCount object for a given product.
	 *
	 * @since 2.0.0
	 *
	 * @param \WC_Product $product the product object
	 * @return \Square\Models\InventoryChange|null
	 */
	public static function get_inventory_change_physical_count_type( \WC_Product $product ) {

		$inventory_change    = null;
		$square_variation_id = self::get_square_item_variation_id( $product->get_id(), false );
		if ( $square_variation_id ) {

			$inventory_physical_count = new \Square\Models\InventoryPhysicalCount();
			$inventory_physical_count->setCatalogObjectId( $square_variation_id );
			$inventory_physical_count->setQuantity( '' . max( 0, $product->get_stock_quantity() ) );
			$inventory_physical_count->setLocationId( wc_square()->get_settings_handler()->get_location_id() );
			$inventory_physical_count->setState( 'IN_STOCK' );
			$inventory_physical_count->setOccurredAt( gmdate( 'Y-m-d\TH:i:sP' ) );

			$inventory_change = new \Square\Models\InventoryChange();
			$inventory_change->setType( 'PHYSICAL_COUNT' );
			$inventory_change->setPhysicalCount( $inventory_physical_count );
		}

		return $inventory_change;
	}


	/**
	 * Gets an InventoryChange object filled with a \Square\Models\InventoryAdjustment object for a given product.
	 *
	 * @since 2.0.8
	 *
	 * @param \WC_Product $product the product object
	 * @param int $adjustment Value can negative or positive.
	 *
	 * @return \Square\Models\InventoryChange|null
	 */
	public static function get_inventory_change_adjustment_type( \WC_Product $product, $adjustment ) {

		$square_variation_id = self::get_square_item_variation_id( $product->get_id(), false );

		if ( empty( $square_variation_id ) || 0 === $adjustment ) {
			return null;
		}

		if ( 0 > $adjustment ) {
			$from = 'IN_STOCK';
			$to   = 'SOLD';
		} else {
			$from = 'NONE';
			$to   = 'IN_STOCK';
		}

		$inventory_adjustment = new \Square\Models\InventoryAdjustment();
		$inventory_adjustment->setCatalogObjectId( $square_variation_id );
		$inventory_adjustment->setLocationId( wc_square()->get_settings_handler()->get_location_id() );
		$inventory_adjustment->setQuantity( '' . absint( $adjustment ) );
		$inventory_adjustment->setFromState( $from );
		$inventory_adjustment->setToState( $to );
		$inventory_adjustment->setOccurredAt( gmdate( 'Y-m-d\TH:i:sP' ) );

		$inventory_change = new \Square\Models\InventoryChange();
		$inventory_change->setType( 'ADJUSTMENT' );
		$inventory_change->setAdjustment( $inventory_adjustment );

		return $inventory_change;
	}

	/**
	 * Checks for location overrides and sets the product/variation's price based on the location
	 *
	 * @since 3.3.1
	 *
	 * @param \WC_Product|\WC_Product_Variation $product
	 * @param \Square\Models\CatalogObject $catalog_variation
	 */
	public static function update_price_money( $product, \Square\Models\CatalogObject $catalog_variation ) {
		$location_overrides = $catalog_variation->getItemVariationData()->getLocationOverrides();

		if ( is_null( $location_overrides ) ) {
			return;
		}

		$location_id = wc_square()->get_settings_handler()->get_location_id();

		foreach ( $location_overrides as $location_override ) {

			if ( $location_id === $location_override->getLocationId() ) {

				// If there is a price override set, then use that amount.
				if ( $location_override->getPriceMoney() ) {

					$product->set_regular_price( Money_Utility::cents_to_float( $location_override->getPriceMoney()->getAmount() ) );
				} elseif ( $catalog_variation->getItemVariationData()->getPriceMoney() ) {

					// No price override amount set; fall back on the base price of item variation.
					$product->set_regular_price( Money_Utility::cents_to_float( $catalog_variation->getItemVariationData()->getPriceMoney()->getAmount() ) );
				}
			}
		}
	}

	/** Helper function to get the variation product's parent ID from posts table but only if the parent product still exists.
	 *
	 * @since 2.5.2
	 * @param int|object $variation_id
	 * @return string|null
	 */
	public static function get_parent_product_id_by_variation_id( $variation_id ) {
		global $wpdb;
		return $wpdb->get_var(
			$wpdb->prepare(
				"
				SELECT pr.post_parent
				FROM {$wpdb->prefix}posts pr
				INNER JOIN {$wpdb->prefix}posts pp ON pp.ID = pr.post_parent
				WHERE pr.ID=%d AND pr.post_type IN ('product', 'product_variation') AND pp.post_type = 'product';
				",
				$variation_id
			)
		);
	}

	/**
	 * Check if product is a gift card.
	 *
	 * @since 4.2.0
	 *
	 * @param \WC_Product $product WooCommerce product.
	 *
	 * @return bool
	 */
	public static function is_gift_card( $product ) {
		if ( ! is_a( $product, 'WC_Product' ) ) {
			return false;
		}

		if ( $product->is_type( 'variation' ) ) {
			$product = wc_get_product( $product->get_parent_id() );
		}

		if ( ! $product instanceof \WC_Product ) {
			return false;
		}

		return $product->meta_exists( self::SQUARE_GIFT_CARD_KEY ) && 'yes' === $product->get_meta( self::SQUARE_GIFT_CARD_KEY, true );
	}
}