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✏️ Editing: ProductsStore.php Writable

<?php
declare(strict_types=1);

namespace Automattic\WooCommerce\Blocks\SharedStores;

use Automattic\WooCommerce\Blocks\Domain\Services\Hydration;
use Automattic\WooCommerce\Blocks\Package;
use InvalidArgumentException;

/**
 * Shared store that hydrates the `woocommerce/products` Interactivity API
 * store with product and variation data in Store API format.
 *
 * The store exposes two planes:
 * - Raw data (`products`, `productVariations`) populated by the `load_*`
 *   methods below, each keyed by ID.
 * - Selection (`productId`, `variationId`) — set by callers via
 *   `wp_interactivity_state` (global) or `data-wp-context` (per-element) —
 *   plus the derived getters (`mainProductInContext`,
 *   `productVariationInContext`, `productInContext`) registered by
 *   `register_getters()`.
 *
 * The derived getters are mirrored in the JS store
 * (client/blocks/assets/js/base/stores/woocommerce/products.ts) so that
 * directive bindings like `state.productInContext.sku` resolve during
 * server-side rendering as well as on the client.
 *
 * See client/blocks/assets/js/base/stores/woocommerce/README.md for the
 * full model and consumer examples.
 *
 * This is an experimental API and may change in future versions.
 */
class ProductsStore {

/**
	 * The consent statement for using this experimental API.
	 *
	 * @var string
	 */
	private static string $consent_statement = 'I acknowledge that using experimental APIs means my theme or plugin will inevitably break in the next version of WooCommerce';

/**
	 * The namespace for the store.
	 *
	 * @var string
	 */
	private static string $store_namespace = 'woocommerce/products';

/**
	 * Products that have been loaded into state.
	 *
	 * @var array
	 */
	private static array $products = array();

/**
	 * Product variations that have been loaded into state.
	 *
	 * @var array
	 */
	private static array $product_variations = array();

/**
	 * Parent product IDs whose variations have already been loaded.
	 *
	 * @var array<int, true>
	 */
	private static array $loaded_variation_parents = array();

/**
	 * Whether the derived-state getters have been registered.
	 *
	 * @var bool
	 */
	private static bool $getters_registered = false;

/**
	 * Check that the consent statement was passed.
	 *
	 * @param string $consent_statement The consent statement string.
	 * @return true
	 * @throws InvalidArgumentException If the statement does not match.
	 */
	private static function check_consent( string $consent_statement ): bool {
		if ( $consent_statement !== self::$consent_statement ) {
			throw new InvalidArgumentException( 'This method cannot be called without consenting that the API may change.' );
		}

return true;
	}

/**
	 * Register the derived-state getters once.
	 *
	 * These closures mirror the JS getters in
	 * client/blocks/assets/js/base/stores/woocommerce/products.ts so that
	 * directives referencing state.mainProductInContext /
	 * state.productVariationInContext / state.productInContext resolve
	 * during SSR. Because they read from
	 * wp_interactivity_state() at call time, they only need to be
	 * registered once regardless of how many products are added.
	 *
	 * @return void
	 */
	private static function register_getters(): void {
		if ( self::$getters_registered ) {
			return;
		}

self::$getters_registered = true;

wp_interactivity_state(
			self::$store_namespace,
			array(
				'mainProductInContext'      => function () {
					$context    = wp_interactivity_get_context();
					$state      = wp_interactivity_state( self::$store_namespace );
					$product_id = array_key_exists( 'productId', $context )
						? $context['productId']
						: ( $state['productId'] ?? null );

if ( ! $product_id ) {
						return null;
					}

return $state['products'][ $product_id ] ?? null;
				},
				'productVariationInContext' => function () {
					$context      = wp_interactivity_get_context();
					$state        = wp_interactivity_state( self::$store_namespace );
					$variation_id = array_key_exists( 'variationId', $context )
						? $context['variationId']
						: ( $state['variationId'] ?? null );

if ( ! $variation_id ) {
						return null;
					}

return $state['productVariations'][ $variation_id ] ?? null;
				},
				'productInContext'          => function () {
					$state    = wp_interactivity_state( self::$store_namespace );
					$selected = $state['productVariationInContext'] instanceof \Closure
						? $state['productVariationInContext']()
						: $state['productVariationInContext'];

if ( $selected ) {
						return $selected;
					}

return $state['mainProductInContext'] instanceof \Closure
						? $state['mainProductInContext']()
						: $state['mainProductInContext'];
				},
			)
		);
	}

/**
	 * Load a product into state.
	 *
	 * @param string $consent_statement The consent statement string.
	 * @param int    $product_id        The product ID.
	 * @return array The product data.
	 * @throws InvalidArgumentException If consent statement doesn't match.
	 */
	public static function load_product( string $consent_statement, int $product_id ): array {
		self::check_consent( $consent_statement );

// Skip loading if product is already in state.
		if ( isset( self::$products[ $product_id ] ) ) {
			return self::$products[ $product_id ];
		}

$response = Package::container()->get( Hydration::class )->get_rest_api_response_data( '/wc/store/v1/products/' . $product_id );

self::$products[ $product_id ] = $response['body'] ?? array();
		self::register_getters();
		wp_interactivity_state(
			self::$store_namespace,
			array( 'products' => array( $product_id => self::$products[ $product_id ] ) )
		);

return self::$products[ $product_id ];
	}

/**
	 * Load all purchasable child products of a parent product into state.
	 *
	 * @param string $consent_statement The consent statement string.
	 * @param int    $parent_id         The parent product ID.
	 * @return array The purchasable child products keyed by ID.
	 * @throws InvalidArgumentException If consent statement doesn't match.
	 */
	public static function load_purchasable_child_products( string $consent_statement, int $parent_id ): array {
		self::check_consent( $consent_statement );

// Get the parent product to retrieve child IDs.
		$parent_product = wc_get_product( $parent_id );
		if ( ! $parent_product ) {
			return array();
		}

// Get child product IDs (for grouped products, these are linked products).
		$child_ids = $parent_product->get_children();
		if ( empty( $child_ids ) ) {
			return array();
		}

// Query child products using include[] filter.
		// The parent[] filter doesn't work for grouped products because
		// their children are standalone products, not variations.
		$include_params = array_map(
			fn( $id ) => 'include[]=' . $id,
			$child_ids
		);
		$query_string   = implode( '&', $include_params );

$response = Package::container()->get( Hydration::class )->get_rest_api_response_data( '/wc/store/v1/products?' . $query_string );

if ( empty( $response['body'] ) ) {
			return array();
		}

// Filter to only purchasable products.
		$purchasable_products = array_filter(
			$response['body'],
			fn( $product ) => $product['is_purchasable']
		);

// Re-key array by product ID and merge into state.
		// Use array_replace instead of array_merge to preserve numeric keys.
		$keyed_products = array_column( $purchasable_products, null, 'id' );
		self::$products = array_replace( self::$products, $keyed_products );
		self::register_getters();
		wp_interactivity_state(
			self::$store_namespace,
			array( 'products' => $keyed_products )
		);

return $keyed_products;
	}

/**
	 * Load all variations of a variable product into state.
	 *
	 * @param string $consent_statement The consent statement string.
	 * @param int    $parent_id         The parent product ID.
	 * @return array The variations keyed by ID.
	 * @throws InvalidArgumentException If consent statement doesn't match.
	 */
	public static function load_variations( string $consent_statement, int $parent_id ): array {
		self::check_consent( $consent_statement );

// Skip loading if variations for this parent have already been loaded.
		if ( isset( self::$loaded_variation_parents[ $parent_id ] ) ) {
			return array_filter(
				self::$product_variations,
				fn( $variation ) => ( $variation['parent'] ?? 0 ) === $parent_id
			);
		}

$response = Package::container()->get( Hydration::class )->get_rest_api_response_data( '/wc/store/v1/products?parent[]=' . $parent_id . '&type=variation' );

self::$loaded_variation_parents[ $parent_id ] = true;

if ( empty( $response['body'] ) ) {
			return array();
		}

// Re-key array by variation ID and merge into state.
		// Use array_replace instead of array_merge to preserve numeric keys.
		$keyed_variations         = array_column( $response['body'], null, 'id' );
		self::$product_variations = array_replace( self::$product_variations, $keyed_variations );
		self::register_getters();
		wp_interactivity_state(
			self::$store_namespace,
			array( 'productVariations' => $keyed_variations )
		);

return $keyed_variations;
	}
}

✏️ Editing: ProductsStore.php Writable

<?php
declare(strict_types=1);

namespace Automattic\WooCommerce\Blocks\SharedStores;

use Automattic\WooCommerce\Blocks\Domain\Services\Hydration;
use Automattic\WooCommerce\Blocks\Package;
use InvalidArgumentException;

/**
	 * The namespace for the store.
	 *
	 * @var string
	 */
	private static string $store_namespace = 'woocommerce/products';

/**
	 * Products that have been loaded into state.
	 *
	 * @var array
	 */
	private static array $products = array();

/**
	 * Product variations that have been loaded into state.
	 *
	 * @var array
	 */
	private static array $product_variations = array();

/**
	 * Parent product IDs whose variations have already been loaded.
	 *
	 * @var array<int, true>
	 */
	private static array $loaded_variation_parents = array();

/**
	 * Whether the derived-state getters have been registered.
	 *
	 * @var bool
	 */
	private static bool $getters_registered = false;

return true;
	}

self::$getters_registered = true;

if ( ! $product_id ) {
						return null;
					}

if ( ! $variation_id ) {
						return null;
					}

if ( $selected ) {
						return $selected;
					}

return $state['mainProductInContext'] instanceof \Closure
						? $state['mainProductInContext']()
						: $state['mainProductInContext'];
				},
			)
		);
	}

// Skip loading if product is already in state.
		if ( isset( self::$products[ $product_id ] ) ) {
			return self::$products[ $product_id ];
		}

$response = Package::container()->get( Hydration::class )->get_rest_api_response_data( '/wc/store/v1/products/' . $product_id );

return self::$products[ $product_id ];
	}

// Get the parent product to retrieve child IDs.
		$parent_product = wc_get_product( $parent_id );
		if ( ! $parent_product ) {
			return array();
		}

// Get child product IDs (for grouped products, these are linked products).
		$child_ids = $parent_product->get_children();
		if ( empty( $child_ids ) ) {
			return array();
		}

$response = Package::container()->get( Hydration::class )->get_rest_api_response_data( '/wc/store/v1/products?' . $query_string );

if ( empty( $response['body'] ) ) {
			return array();
		}

// Filter to only purchasable products.
		$purchasable_products = array_filter(
			$response['body'],
			fn( $product ) => $product['is_purchasable']
		);

return $keyed_products;
	}

$response = Package::container()->get( Hydration::class )->get_rest_api_response_data( '/wc/store/v1/products?parent[]=' . $parent_id . '&type=variation' );

self::$loaded_variation_parents[ $parent_id ] = true;

if ( empty( $response['body'] ) ) {
			return array();
		}

return $keyed_variations;
	}
}

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