From ebda39d1309c8a4250d25fb79ae1b45ac1696ff1 Mon Sep 17 00:00:00 2001
From: Narek Zakarian <narekzakarian@gmail.com>
Date: Wed, 1 Jun 2022 18:17:51 +0400
Subject: [PATCH] If product has inStock variation then allow buttons

---
 .../ppcp-button/src/Assets/SmartButton.php    | 35 ++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/modules/ppcp-button/src/Assets/SmartButton.php b/modules/ppcp-button/src/Assets/SmartButton.php
index f15b8c800..0391ea5b8 100644
--- a/modules/ppcp-button/src/Assets/SmartButton.php
+++ b/modules/ppcp-button/src/Assets/SmartButton.php
@@ -12,6 +12,7 @@ namespace WooCommerce\PayPalCommerce\Button\Assets;
 use Exception;
 use Psr\Log\LoggerInterface;
 use WC_Product;
+use WC_Product_Variation;
 use WooCommerce\PayPalCommerce\ApiClient\Entity\PaymentToken;
 use WooCommerce\PayPalCommerce\ApiClient\Factory\PayerFactory;
 use WooCommerce\PayPalCommerce\ApiClient\Helper\DccApplies;
@@ -1252,9 +1253,25 @@ class SmartButton implements SmartButtonInterface {
 		/**
 		 * The filter returning true if PayPal buttons/messages can be rendered for this product, or false otherwise.
 		 */
+
+		$in_stock = $product->is_in_stock();
+
+		if ( $product->is_type( 'variable' ) ) {
+			/**
+			 * The method is defined in WC_Product_Variable class.
+			 *
+			 * @psalm-suppress UndefinedMethod
+			 */
+			$variations = $product->get_available_variations( 'objects' );
+			$in_stock   = $this->has_in_stock_variation( $variations );
+		}
+
+		/**
+		 * Allows to filter if PayPal buttons/messages can be rendered for the given product.
+		 */
 		return apply_filters(
 			'woocommerce_paypal_payments_product_supports_payment_request_button',
-			! $product->is_type( array( 'external', 'grouped' ) ) && $product->is_in_stock(),
+			! $product->is_type( array( 'external', 'grouped' ) ) && $in_stock,
 			$product
 		);
 	}
@@ -1291,4 +1308,20 @@ class SmartButton implements SmartButtonInterface {
 		}
 		return '';
 	}
+
+	/**
+	 * Checks if variations contain any in stock variation.
+	 *
+	 * @param WC_Product_Variation[] $variations The list of variations.
+	 * @return bool True if any in stock variation, false otherwise.
+	 */
+	protected function has_in_stock_variation( array $variations ): bool {
+		foreach ( $variations as $variation ) {
+			if ( $variation->is_in_stock() ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
 }