调整下单获取可用优惠券

app/Services/CouponService.php

@@ -13,22 +13,47 @@ class CouponService
      * 根据SKU商品获取可用优惠券
      *
      * @param User $user
-     * @param collection $skus
+     * @param array $skus 至少包含以下内容
+     * [
+     *      ['id', 'category_id', 'sell_price', 'vip_price', 'num']
+     * ]
      * @return collection
      */
-    public function availableCouponsToUser(User $user, collection $skus): collection
+    public function availableCouponsToUser(User $user, array $skus): collection
     {
         //获取用户当前所有可用券
         $coupons = $this->userValidCoupons($user);
-        //判断券在这批商品中是否可用
+
-        $availableCouponIds = [];
+        $couponSkus = [];
         $availableCoupons = [];
+
         foreach ($coupons as $coupon) {
-            if (in_array($coupon->coupon_id, $availableCouponIds)) {//遇到同样的券ID时直接跳过
+            if (!isset($couponSkus[$coupon->coupon_id])) {
-                $availableCoupons[] = $coupon;
+                foreach ($skus as $sku) {
-            } else {
+                    //这个商品是否在这个券的可用范围
-                if ($this->isAvailableCouponToSomeSku($skus, $coupon)) {
+                    if ($this->isAvailableCouponToSku($sku, $coupon)) {
-                    $availableCouponIds[] = $coupon->coupon_id;
+                        //按coupon_id 分组商品
+                        $couponSkus[$coupon->coupon_id][] = $sku;
+                    }
+                }
+            }
+        }
+
+        foreach ($coupons as $coupon) {
+            // 这个券是否有可用的商品
+            if (isset($couponSkus[$coupon->coupon_id])) {
+                //用户是否是vip
+                if ($user->isVip()) {
+                    $totalAmount = collect($couponSkus[$coupon->coupon_id])->sum(function ($item) {
+                        return bcmul($item['vip_price'], $item['num']);
+                    });
+                } else {
+                    $totalAmount = collect($couponSkus[$coupon->coupon_id])->sum(function ($item) {
+                        return bcmul($item['sell_price'], $item['num']);
+                    });
+                }
+                //针对这个券，可用的商品合计价格是否满足使用门槛
+                if ($totalAmount >= $coupon->coupon_threshold) {
                     $availableCoupons[] = $coupon;
                 }
             }
@@ -47,7 +72,7 @@ class CouponService
     {
         return UserCoupon::with('ranges')->where([
             'user_id'=>$user->id,
-        ])->unuse()->get();
+        ])->onlyUnuse()->get();
     }
 
     /**
@@ -70,22 +95,25 @@ class CouponService
     /**
      * 这个商品是否可用这个券
      *
-     * @param ProductSku $productSku
+     * @param array $productSku ['id', 'category_id', 'sell_price', 'vip_price', 'num']
      * @param Coupon $coupon
      * @return boolean
      */
-    protected function isAvailableCouponToSku(ProductSku $sku, UserCoupon $coupon)
+    protected function isAvailableCouponToSku($sku, UserCoupon $coupon)
     {
         $res = false;
+        if ($coupon->ranges->count() == 0) {//如果没有规则则通用
+            return true;
+        }
         foreach ($coupon->ranges as $range) {
             switch ($range->type) {
                 case 1://指定商品分类
-                    if (in_array($sku->category_id, explode(',', $range->ranges))) {
+                    if (in_array($sku['category_id'], explode(',', $range->ranges))) {
                         $res = true;
                     }
                     break;
                 case 2://指定商品IDS
-                    if (in_array($sku->id, explode(',', $range->ranges))) {
+                    if (in_array($sku['id'], explode(',', $range->ranges))) {
                         $res = true;
                     }
                     break;