feat: Implement upsell functionality with repository and service layers

app/Services/UpsellService.php

@@ -0,0 +1,149 @@
+<?php
+namespace Sodino\Services;
+
+use Sodino\Repositories\UpsellRepository;
+
+class UpsellService {
+    private $upsellRepository;
+    private $cache = null;
+
+    public function __construct(UpsellRepository $upsellRepository) {
+        $this->upsellRepository = $upsellRepository;
+    }
+
+    public function getActiveUpsells() {
+        if ($this->cache === null) {
+            $this->cache = $this->upsellRepository->getActive();
+        }
+        return $this->cache;
+    }
+
+    public function getMatchingUpsells($cart) {
+        if (!$cart || $cart->is_empty()) {
+            return [];
+        }
+
+        $matches = [];
+        foreach ($this->getActiveUpsells() as $upsell) {
+            if ($this->cartMatchesTrigger($upsell, $cart) && !$this->isProductAlreadyInCart($cart, $upsell->target_product_id)) {
+                $matches[] = $upsell;
+            }
+        }
+
+        usort($matches, function ($a, $b) {
+            return $b->priority <=> $a->priority;
+        });
+
+        return $matches;
+    }
+
+    public function applyUpsellDiscount($product, $upsell) {
+        if (!$product || !$upsell) {
+            return 0;
+        }
+
+        $price = floatval($product->get_price());
+        if ($upsell->discount_type === 'percentage') {
+            return max(0, $price * (1 - floatval($upsell->discount_value) / 100));
+        }
+
+        if ($upsell->discount_type === 'fixed') {
+            return max(0, $price - floatval($upsell->discount_value));
+        }
+
+        return $price;
+    }
+
+    public function getTriggerLabel($upsell) {
+        switch ($upsell->trigger_type) {
+            case 'product':
+                return __('محصول خاص', 'sodino');
+            case 'category':
+                return __('دسته‌بندی', 'sodino');
+            case 'cart_total':
+                return __('مبلغ سبد خرید', 'sodino');
+            default:
+                return __('نامشخص', 'sodino');
+        }
+    }
+
+    public function getDiscountLabel($upsell) {
+        if ($upsell->discount_type === 'fixed') {
+            return sprintf('%s تومان', number_format_i18n($upsell->discount_value));
+        }
+
+        if ($upsell->discount_type === 'percentage') {
+            return sprintf('%s %%', esc_html($upsell->discount_value));
+        }
+
+        return __('بدون تخفیف', 'sodino');
+    }
+
+    private function cartMatchesTrigger($upsell, $cart) {
+        if (!$upsell->isActive()) {
+            return false;
+        }
+
+        $triggerType = $upsell->trigger_type;
+        $triggerValue = $upsell->trigger_value;
+
+        switch ($triggerType) {
+            case 'product':
+                return $this->cartContainsProduct($cart, intval($triggerValue));
+            case 'category':
+                return $this->cartContainsCategory($cart, intval($triggerValue));
+            case 'cart_total':
+                return floatval($cart->get_cart_contents_total()) >= floatval($triggerValue);
+            default:
+                return false;
+        }
+    }
+
+    private function cartContainsProduct($cart, $productId) {
+        if (!$productId) {
+            return false;
+        }
+
+        foreach ($cart->get_cart() as $cartItem) {
+            if ((int) $cartItem['product_id'] === $productId || (int) $cartItem['variation_id'] === $productId) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function cartContainsCategory($cart, $categoryId) {
+        if (!$categoryId) {
+            return false;
+        }
+
+        foreach ($cart->get_cart() as $cartItem) {
+            $product = wc_get_product($cartItem['product_id']);
+            if (!$product) {
+                continue;
+            }
+
+            $terms = wp_get_post_terms($product->get_id(), 'product_cat', ['fields' => 'ids']);
+            if (is_array($terms) && in_array($categoryId, $terms, true)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private function isProductAlreadyInCart($cart, $productId) {
+        if (!$productId) {
+            return false;
+        }
+
+        foreach ($cart->get_cart() as $cartItem) {
+            if ((int) $cartItem['product_id'] === $productId || (int) $cartItem['variation_id'] === $productId) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}