Update CartModel.php

src/Models/CartModel.php

@@ -2,8 +2,10 @@
 
 namespace Gloudemans\Models;
  
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Facades\Config;
+use Money\Money;
  
 class CartModel extends Model
 {
@@ -31,4 +33,86 @@ class CartModel extends Model
     {
         return $this->hasMany(CartItem::class);
     }
+ 
+    /**
+     * This will is the price of the CartItem considering the set quantity. If you need the single
+     * price just set the parameter to true.
+     */
+    public function price(): Attribute
+    {
+        return new Attribute(
+            get: fn (int $value) => new Money($value),
+            set: fn (Money $value) => $value,
+        );
+    }
+    
+    /**
+     * This will is the price of the CartItem considering the set quantity. If you need the single
+     * price just set the parameter to true.
+     */
+    public function priceAll(): Attribute
+    {
+        return new Attribute(
+            get: fn () => $this->price->multiply($this->qty),
+        );
+    }
+
+    /**
+     * This is the discount granted for this CartItem. It is based on the given price and, in case
+     * discount is a float, multiplied or, in case it is an absolute Money, subtracted. It will return
+     * a minimum value of 0.
+     */
+    public function discount(): Attribute
+    {
+        return new Attribute(
+            get: fn () => {
+                if ($this->discount instanceof Money) {
+                    return $this->price_all->subtract($this->discount)
+                } else {
+                    return $this->price_all->multiply(sprintf('%.14F', $this->discount), Config::get('cart.rounding', Money::ROUND_UP)),
+                }
+            },
+        );
+    }
+
+    /**
+     * This is the final price of the CartItem but without any tax applied. This does on the
+     * other hand include any discounts.
+     */
+    public function subtotal(): Attribute
+    {
+        return new Attribute(
+            get: fn () => Money::max(new Money(0, $this->price->getCurrency()), $this->price()->subtract($this->discount())),
+        );
+    }
+
+    /**
+     * This is the tax, based on the subtotal (all previous calculations) and set tax rate.
+     */
+    public function tax(): Attribute
+    {
+        return new Attribute(
+            get: fn () => $this->subtotal()->multiply(sprintf('%.14F', $this->taxRate), Config::get('cart.rounding', Money::ROUND_UP)),
+        );
+    }
+
+    /**
+     * This is the total price, consisting of the subtotal and tax applied.
+     */
+    public function total(): Attribute
+    {
+        return new Attribute(
+            get: fn () => $this->subtotal()->add($this->tax()),
+        );
+    }
+
+    /**
+     * This is the total price, consisting of the subtotal and tax applied.
+     */
+    public function totalWeight(): Attribute
+    {
+        return new Attribute(
+            get: fn () => $this->qty * $this->weight,
+        );
+    }
 }