feat(cart): implement user purchase limit validation for cart items and add related tests

2026-08-06 16:43:04 -03:00
parent 5ad61eb217
commit f578c6e24a
6 changed files with 251 additions and 30 deletions
--- a/app/Domains/Purchase/Services/UserPurchaseLimitService.php
+++ b/app/Domains/Purchase/Services/UserPurchaseLimitService.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace App\Domains\Purchase\Services;
+
+use App\Domains\Catalog\Models\CatalogItem;
+use App\Domains\Purchase\Models\Purchase;
+use App\Domains\Purchase\Models\PurchaseItem;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Validation\ValidationException;
+
+class UserPurchaseLimitService
+{
+    public function assertCanPurchase(
+        CatalogItem $catalogItem,
+        int $userId,
+        int $requestedQuantity,
+        ?int $excludedPurchaseId = null,
+        string $field = 'quantity',
+    ): void {
+        DB::transaction(function () use (
+            $catalogItem,
+            $userId,
+            $requestedQuantity,
+            $excludedPurchaseId,
+            $field,
+        ): void {
+            /** @var CatalogItem $catalogItem */
+            $catalogItem = CatalogItem::query()
+                ->whereKey($catalogItem->getKey())
+                ->lockForUpdate()
+                ->firstOrFail();
+            $limit = $catalogItem->max_units_per_user;
+
+            if ($limit === null) {
+                return;
+            }
+
+            $purchasedQuantity = (int) PurchaseItem::query()
+                ->where('source_catalog_item_id', $catalogItem->getKey())
+                ->whereHas('purchase', function ($query) use ($userId, $excludedPurchaseId): void {
+                    $query
+                        ->where('user_id', $userId)
+                        ->whereIn('status', [
+                            Purchase::STATUS_CREATED,
+                            Purchase::STATUS_PENDING_PAYMENT,
+                            Purchase::STATUS_PAID,
+                        ])
+                        ->when(
+                            $excludedPurchaseId !== null,
+                            fn ($query) => $query->whereKeyNot($excludedPurchaseId),
+                        );
+                })
+                ->sum('cantidad');
+
+            if ($purchasedQuantity + $requestedQuantity > $limit) {
+                throw ValidationException::withMessages([
+                    $field => __('api.purchase_limit.exceeded', ['max' => $limit]),
+                ]);
+            }
+        });
+    }
+}