Add simulate cart endpoint

modules/ppcp-button/services.php

@@ -11,6 +11,7 @@ namespace WooCommerce\PayPalCommerce\Button;
 
 use WooCommerce\PayPalCommerce\Button\Endpoint\ApproveSubscriptionEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\CartScriptParamsEndpoint;
+use WooCommerce\PayPalCommerce\Button\Endpoint\SimulateCartEndpoint;
 use WooCommerce\PayPalCommerce\Button\Helper\CheckoutFormSaver;
 use WooCommerce\PayPalCommerce\Button\Endpoint\SaveCheckoutFormEndpoint;
 use WooCommerce\PayPalCommerce\Button\Validation\CheckoutFormValidator;
@@ -124,6 +125,16 @@ return array(
 	'button.request-data'                         => static function ( ContainerInterface $container ): RequestData {
 		return new RequestData();
 	},
+	'button.endpoint.simulate-cart'               => static function ( ContainerInterface $container ): SimulateCartEndpoint {
+		if ( ! \WC()->cart ) {
+			throw new RuntimeException( 'cant initialize endpoint at this moment' );
+		}
+		$cart         = WC()->cart;
+		$request_data = $container->get( 'button.request-data' );
+		$data_store   = \WC_Data_Store::load( 'product' );
+		$logger       = $container->get( 'woocommerce.logger.woocommerce' );
+		return new SimulateCartEndpoint( $cart, $request_data, $data_store, $logger );
+	},
 	'button.endpoint.change-cart'                 => static function ( ContainerInterface $container ): ChangeCartEndpoint {
 		if ( ! \WC()->cart ) {
 			throw new RuntimeException( 'cant initialize endpoint at this moment' );

modules/ppcp-button/src/Assets/SmartButton.php

@@ -25,6 +25,7 @@ use WooCommerce\PayPalCommerce\Button\Endpoint\CreateOrderEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\DataClientIdEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\RequestData;
 use WooCommerce\PayPalCommerce\Button\Endpoint\SaveCheckoutFormEndpoint;
+use WooCommerce\PayPalCommerce\Button\Endpoint\SimulateCartEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\StartPayPalVaultingEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\ValidateCheckoutEndpoint;
 use WooCommerce\PayPalCommerce\Button\Helper\ContextTrait;
@@ -827,6 +828,10 @@ class SmartButton implements SmartButtonInterface {
 			'redirect'                          => wc_get_checkout_url(),
 			'context'                           => $this->context(),
 			'ajax'                              => array(
+				'simulate_cart'        => array(
+					'endpoint' => \WC_AJAX::get_endpoint( SimulateCartEndpoint::ENDPOINT ),
+					'nonce'    => wp_create_nonce( SimulateCartEndpoint::nonce() ),
+				),
 				'change_cart'          => array(
 					'endpoint' => \WC_AJAX::get_endpoint( ChangeCartEndpoint::ENDPOINT ),
 					'nonce'    => wp_create_nonce( ChangeCartEndpoint::nonce() ),
@@ -1329,6 +1334,18 @@ class SmartButton implements SmartButtonInterface {
 		return WC()->cart && WC()->cart->get_total( 'numeric' ) == 0;
 	}
 
+	/**
+	 * Returns the cart total.
+	 *
+	 * @return ?float
+	 */
+	protected function get_cart_price_total(): ?float {
+		if ( ! WC()->cart ) {
+			return null;
+		}
+		return (float) WC()->cart->get_total( 'numeric' );
+	}
+
 	/**
 	 * Checks if PayPal buttons/messages can be rendered for the given product.
 	 *
@@ -1419,13 +1436,18 @@ class SmartButton implements SmartButtonInterface {
 		if ( 'product' === $location ) {
 			$product = wc_get_product();
 
+			if ( ! $product ) {
+				return true;
+			}
+
 			/**
 			 * Allows to decide if the button should be disabled for a given product
 			 */
 			$is_disabled = apply_filters(
 				'woocommerce_paypal_payments_product_buttons_paylater_disabled',
 				null,
-				$product
+				$product,
+				$product->get_price( 'numeric' )
 			);
 
 			if ( $is_disabled !== null ) {
@@ -1439,7 +1461,8 @@ class SmartButton implements SmartButtonInterface {
 		$is_disabled = apply_filters(
 			'woocommerce_paypal_payments_buttons_paylater_disabled',
 			null,
-			$location
+			$location,
+			$this->get_cart_price_total()
 		);
 
 		if ( $is_disabled !== null ) {
@@ -1455,7 +1478,7 @@ class SmartButton implements SmartButtonInterface {
 	 * @param string $location The location.
 	 * @return bool true if is enabled, otherwise false.
 	 */
-	private function is_pay_later_button_enabled_for_location( string $location ) {
+	private function is_pay_later_button_enabled_for_location( string $location ): bool {
 		return $this->is_pay_later_filter_enabled_for_location( $location )
 			&& $this->settings_status->is_pay_later_button_enabled_for_location( $location );
 
@@ -1467,7 +1490,7 @@ class SmartButton implements SmartButtonInterface {
 	 * @param string $location The location setting name.
 	 * @return bool true if is enabled, otherwise false.
 	 */
-	private function is_pay_later_messaging_enabled_for_location( string $location ) {
+	private function is_pay_later_messaging_enabled_for_location( string $location ): bool {
 		return $this->is_pay_later_filter_enabled_for_location( $location )
 			&& $this->settings_status->is_pay_later_messaging_enabled_for_location( $location );
 	}
@@ -1477,7 +1500,7 @@ class SmartButton implements SmartButtonInterface {
 	 *
 	 * @return bool true if is enabled, otherwise false.
 	 */
-	private function is_pay_later_messaging_enabled() {
+	private function is_pay_later_messaging_enabled(): bool {
 		return $this->is_pay_later_filter_enabled_for_location( $this->context() )
 			&& $this->settings_status->is_pay_later_messaging_enabled();
 	}

modules/ppcp-button/src/ButtonModule.php

@@ -12,6 +12,7 @@ namespace WooCommerce\PayPalCommerce\Button;
 use WooCommerce\PayPalCommerce\Button\Endpoint\ApproveSubscriptionEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\CartScriptParamsEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\SaveCheckoutFormEndpoint;
+use WooCommerce\PayPalCommerce\Button\Endpoint\SimulateCartEndpoint;
 use WooCommerce\PayPalCommerce\Button\Endpoint\ValidateCheckoutEndpoint;
 use WooCommerce\PayPalCommerce\Vendor\Dhii\Container\ServiceProvider;
 use WooCommerce\PayPalCommerce\Vendor\Dhii\Modular\Module\ModuleInterface;
@@ -120,6 +121,19 @@ class ButtonModule implements ModuleInterface {
 			}
 		);
 
+		add_action(
+			'wc_ajax_' . SimulateCartEndpoint::ENDPOINT,
+			static function () use ( $container ) {
+				$endpoint = $container->get( 'button.endpoint.simulate-cart' );
+				/**
+				 * The Simulate Cart Endpoint.
+				 *
+				 * @var SimulateCartEndpoint $endpoint
+				 */
+				$endpoint->handle_request();
+			}
+		);
+
 		add_action(
 			'wc_ajax_' . ChangeCartEndpoint::ENDPOINT,
 			static function () use ( $container ) {

modules/ppcp-button/src/Endpoint/SimulateCartEndpoint.php

@@ -0,0 +1,274 @@
+<?php
+/**
+ * Endpoint to simulate adding products to the cart.
+ *
+ * @package WooCommerce\PayPalCommerce\Button\Endpoint
+ */
+
+declare(strict_types=1);
+
+namespace WooCommerce\PayPalCommerce\Button\Endpoint;
+
+use Exception;
+use Psr\Log\LoggerInterface;
+use WooCommerce\PayPalCommerce\ApiClient\Exception\PayPalApiException;
+use WooCommerce\PayPalCommerce\ApiClient\Factory\PurchaseUnitFactory;
+
+/**
+ * Class SimulateCartEndpoint
+ */
+class SimulateCartEndpoint implements EndpointInterface {
+
+	const ENDPOINT = 'ppc-simulate-cart';
+
+	/**
+	 * The cart object.
+	 *
+	 * @var \WC_Cart
+	 */
+	private $cart;
+
+	/**
+	 * The request data helper.
+	 *
+	 * @var RequestData
+	 */
+	private $request_data;
+
+	/**
+	 * The product data store.
+	 *
+	 * @var \WC_Data_Store
+	 */
+	private $product_data_store;
+
+	/**
+	 * The logger.
+	 *
+	 * @var LoggerInterface
+	 */
+	protected $logger;
+
+	/**
+	 * ChangeCartEndpoint constructor.
+	 *
+	 * @param \WC_Cart        $cart The current WC cart object.
+	 * @param RequestData     $request_data The request data helper.
+	 * @param \WC_Data_Store  $product_data_store The data store for products.
+	 * @param LoggerInterface $logger The logger.
+	 */
+	public function __construct(
+		\WC_Cart $cart,
+		RequestData $request_data,
+		\WC_Data_Store $product_data_store,
+		LoggerInterface $logger
+	) {
+
+		$this->cart               = clone $cart;
+		$this->request_data       = $request_data;
+		$this->product_data_store = $product_data_store;
+		$this->logger             = $logger;
+	}
+
+	/**
+	 * The nonce.
+	 *
+	 * @return string
+	 */
+	public static function nonce(): string {
+		return self::ENDPOINT;
+	}
+
+	/**
+	 * Handles the request.
+	 *
+	 * @return bool
+	 */
+	public function handle_request(): bool {
+		try {
+			return $this->handle_data();
+		} catch ( Exception $error ) {
+			$this->logger->error( 'Cart simulation failed: ' . $error->getMessage() );
+
+			wp_send_json_error(
+				array(
+					'name'    => is_a( $error, PayPalApiException::class ) ? $error->name() : '',
+					'message' => $error->getMessage(),
+					'code'    => $error->getCode(),
+					'details' => is_a( $error, PayPalApiException::class ) ? $error->details() : array(),
+				)
+			);
+			return false;
+		}
+	}
+
+	/**
+	 * Handles the request data.
+	 *
+	 * @return bool
+	 * @throws Exception On error.
+	 */
+	private function handle_data(): bool {
+		$data     = $this->request_data->read_request( $this->nonce() );
+		$products = $this->products_from_data( $data );
+		if ( ! $products ) {
+			wp_send_json_error(
+				array(
+					'name'    => '',
+					'message' => __(
+						'Necessary fields not defined. Action aborted.',
+						'woocommerce-paypal-payments'
+					),
+					'code'    => 0,
+					'details' => array(),
+				)
+			);
+			return false;
+		}
+
+		$this->cart->empty_cart( false );
+		$success = true;
+		foreach ( $products as $product ) {
+			$success = $success && ( ! $product['product']->is_type( 'variable' ) ) ?
+				$this->add_product( $product['product'], $product['quantity'] )
+				: $this->add_variable_product(
+					$product['product'],
+					$product['quantity'],
+					$product['variations']
+				);
+		}
+		if ( ! $success ) {
+			$this->handle_error();
+			return $success;
+		}
+
+		$this->cart->calculate_totals();
+
+		$total = $this->cart->get_total( 'numeric' );
+
+		unset( $this->cart );
+
+		wp_send_json_success(
+			array(
+				'total' => $total,
+			)
+		);
+		return $success;
+	}
+
+	/**
+	 * Handles errors.
+	 *
+	 * @return bool
+	 */
+	private function handle_error(): bool {
+
+		$message = __(
+			'Something went wrong. Action aborted',
+			'woocommerce-paypal-payments'
+		);
+		$errors  = wc_get_notices( 'error' );
+		if ( count( $errors ) ) {
+			$message = array_reduce(
+				$errors,
+				static function ( string $add, array $error ): string {
+					return $add . $error['notice'] . ' ';
+				},
+				''
+			);
+			wc_clear_notices();
+		}
+
+		wp_send_json_error(
+			array(
+				'name'    => '',
+				'message' => $message,
+				'code'    => 0,
+				'details' => array(),
+			)
+		);
+		return true;
+	}
+
+	/**
+	 * Returns product information from an data array.
+	 *
+	 * @param array $data The data array.
+	 *
+	 * @return array|null
+	 */
+	private function products_from_data( array $data ) {
+
+		$products = array();
+
+		if (
+			! isset( $data['products'] )
+			|| ! is_array( $data['products'] )
+		) {
+			return null;
+		}
+		foreach ( $data['products'] as $product ) {
+			if ( ! isset( $product['quantity'] ) || ! isset( $product['id'] ) ) {
+				return null;
+			}
+
+			$wc_product = wc_get_product( (int) $product['id'] );
+
+			if ( ! $wc_product ) {
+				return null;
+			}
+			$products[] = array(
+				'product'    => $wc_product,
+				'quantity'   => (int) $product['quantity'],
+				'variations' => isset( $product['variations'] ) ? $product['variations'] : null,
+			);
+		}
+		return $products;
+	}
+
+	/**
+	 * Adds a product to the cart.
+	 *
+	 * @param \WC_Product $product The Product.
+	 * @param int         $quantity The Quantity.
+	 *
+	 * @return bool
+	 * @throws Exception When product could not be added.
+	 */
+	private function add_product( \WC_Product $product, int $quantity ): bool {
+		return false !== $this->cart->add_to_cart( $product->get_id(), $quantity );
+	}
+
+	/**
+	 * Adds variations to the cart.
+	 *
+	 * @param \WC_Product $product The Product.
+	 * @param int         $quantity The Quantity.
+	 * @param array       $post_variations The variations.
+	 *
+	 * @return bool
+	 * @throws Exception When product could not be added.
+	 */
+	private function add_variable_product(
+		\WC_Product $product,
+		int $quantity,
+		array $post_variations
+	): bool {
+
+		$variations = array();
+		foreach ( $post_variations as $key => $value ) {
+			$variations[ $value['name'] ] = $value['value'];
+		}
+
+		$variation_id = $this->product_data_store->find_matching_product_variation( $product, $variations );
+
+		// ToDo: Check stock status for variation.
+		return false !== $this->cart->add_to_cart(
+			$product->get_id(),
+			$quantity,
+			$variation_id,
+			$variations
+		);
+	}
+
+}

modules/ppcp-onboarding/src/OnboardingModule.php

@@ -11,7 +11,6 @@ namespace WooCommerce\PayPalCommerce\Onboarding;
 
 use WooCommerce\PayPalCommerce\Vendor\Dhii\Container\ServiceProvider;
 use WooCommerce\PayPalCommerce\Vendor\Dhii\Modular\Module\ModuleInterface;
-use WooCommerce\PayPalCommerce\Button\Endpoint\ChangeCartEndpoint;
 use WooCommerce\PayPalCommerce\Onboarding\Assets\OnboardingAssets;
 use WooCommerce\PayPalCommerce\Onboarding\Endpoint\LoginSellerEndpoint;
 use WooCommerce\PayPalCommerce\Onboarding\Render\OnboardingRenderer;
@@ -88,9 +87,9 @@ class OnboardingModule implements ModuleInterface {
 				$endpoint = $c->get( 'onboarding.endpoint.login-seller' );
 
 				/**
-				 * The ChangeCartEndpoint.
+				 * The LoginSellerEndpoint.
 				 *
-				 * @var ChangeCartEndpoint $endpoint
+				 * @var LoginSellerEndpoint $endpoint
 				 */
 				$endpoint->handle_request();
 			}