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@@ -0,0 +1,103 @@
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+<?php
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+
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+namespace Longyi\FreeGift\Services;
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+
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+use Longyi\Core\Models\ProductVariant;
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+use Longyi\Core\Repositories\ProductVariantRepository;
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+use Webkul\Product\Repositories\ProductRepository;
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+
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+/**
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+ * 把赠品 SKU 解析成「商品 + 变体」。
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+ *
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+ * `free_gift_rules.sku` 里存的可能是：
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+ * - simple / virtual 商品的 SKU → variant 为 null
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+ * - flexible_variant 父商品的 SKU（后台选择器给的就是这个）→ 取一个默认变体
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+ * - flexible_variant 某个变体的 SKU → 直接用该变体
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+ *
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+ * 单请求内按 SKU 缓存：一次 collectTotals 里 syncGiftItems / autoAddGiftItems
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+ * 会反复问同一个 SKU。
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+ */
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+class GiftProductResolver
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+{
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+ /**
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+ * @var array<string, array{product: object, variant: ?ProductVariant}|null>
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+ */
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+ protected array $cache = [];
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+
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+ public function __construct(
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+ protected ProductRepository $productRepository,
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+ protected ProductVariantRepository $variantRepository
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+ ) {}
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+
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+ /**
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+ * @return array{product: object, variant: ?ProductVariant}|null
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+ */
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+ public function resolve(string $sku): ?array
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+ {
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+ $sku = trim($sku);
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+
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+ if ($sku === '') {
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+ return null;
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+ }
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+
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+ if (! array_key_exists($sku, $this->cache)) {
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+ $this->cache[$sku] = $this->doResolve($sku);
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+ }
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+
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+ return $this->cache[$sku];
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+ }
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+
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+ /**
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+ * 解析失败（赠品被下架/删除、SKU 写错）返回 null，调用方按「本次送不出去」处理。
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+ */
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+ protected function doResolve(string $sku): ?array
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+ {
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+ // 1) 先当商品 SKU 找（simple / virtual / flexible_variant 的父商品）
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+ $product = $this->productRepository->findOneWhere(['sku' => $sku]);
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+
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+ if ($product) {
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+ if ($product->type === 'flexible_variant') {
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+ $variant = $this->defaultVariant((int) $product->id);
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+
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+ return $variant ? ['product' => $product, 'variant' => $variant] : null;
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+ }
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+
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+ return ['product' => $product, 'variant' => null];
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+ }
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+
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+ // 2) 再当变体 SKU 找（flexible_variant 的行）
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+ $variant = $this->variantRepository->findBySku($sku);
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+
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+ if (! $variant || ! $variant->product) {
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+ return null;
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+ }
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+
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+ return ['product' => $variant->product, 'variant' => $variant];
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+ }
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+
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+ /**
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+ * 配置的是父商品 SKU 时挑一个变体：优先「启用且有货」的第一条（按 sort_order），
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+ * 全都无货时退回「启用」的第一条 —— 让库存校验去决定放不放行。
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+ */
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+ public function defaultVariant(int $productId): ?ProductVariant
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+ {
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+ return $this->variantRepository->getSaleableByProduct($productId)->first()
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+ ?: $this->variantRepository->getByProduct($productId, true)->first();
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+ }
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+
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+ /**
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+ * 拿变体上的最终成交价（含特价/目录促销/客户组价）。
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+ */
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+ public function variantPrice(?ProductVariant $variant): float
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+ {
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+ if (! $variant) {
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+ return 0;
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+ }
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+
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+ try {
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+ return (float) $variant->getEffectivePrice();
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+ } catch (\Throwable) {
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+ return (float) ($variant->special_price ?: $variant->price ?: 0);
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+ }
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+ }
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+}
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llp