A adjustStock method

src/Traits/HasStocks.php

@@ -79,6 +79,30 @@ trait HasStocks
         return true;
     }
 
+    public function adjustStock(
+        StockType $type,
+        int $quantity,
+        \DateTimeInterface|null $until = null,
+        ?StockStatus $status = null,
+    ) {
+        if (!$this->manage_stock) {
+            return false;
+        }
+
+        $this->stocks()->create([
+            'quantity' => $type === StockType::INCREASE ? $quantity : -$quantity,
+            'type' => $type,
+            'status' => $status ?? StockStatus::COMPLETED,
+            'expires_at' => $until,
+        ]);
+
+        $this->logStockChange($type === StockType::INCREASE ? $quantity : -$quantity, 'adjust');
+
+        $this->save();
+
+        return true;
+    }
+
     public function reserveStock(
         int $quantity,
         $reference = null,

tests/Feature/ProductStockTest.php

@@ -193,7 +193,7 @@ class ProductStockTest extends TestCase
 
         // Expired reservations should be counted in available stock
         $available = $product->reservations()->get();
-        
+
         $this->assertEquals(0, $available->count());
     }
 
@@ -275,4 +275,41 @@ class ProductStockTest extends TestCase
         $this->assertCount(1, $reservations);
         $this->assertEquals($active->id, $reservations->first()->id);
     }
+
+    /** @test */
+    public function can_adjust_stock()
+    {
+        $product = Product::factory()->create(['manage_stock' => true]);
+
+        $product->increaseStock(20);
+        $this->assertEquals(20, $product->getAvailableStock());
+
+        $product->adjustStock(
+            type: \Blax\Shop\Enums\StockType::DECREASE,
+            quantity: 5
+        );
+        $this->assertEquals(15, $product->getAvailableStock());
+
+        $product->adjustStock(
+            type: \Blax\Shop\Enums\StockType::INCREASE,
+            quantity: 10
+        );
+        $this->assertEquals(25, $product->getAvailableStock());
+
+        // Also with until
+        $product->adjustStock(
+            type: \Blax\Shop\Enums\StockType::DECREASE,
+            quantity: 5,
+            until: now()->addDay()
+        );
+        $this->assertEquals(20, $product->getAvailableStock());
+
+        $this->travel(23)->hours();
+
+        $this->assertEquals(20, $product->getAvailableStock());
+
+        $this->travel(2)->days();
+
+        $this->assertEquals(25, $product->getAvailableStock());
+    }
 }