Support variant-aware cart lines

src/app/pages/cart/cart.component.ts

@@ -102,27 +102,36 @@ export class CartComponent implements OnDestroy {
     }
   }
 
-  removeItem(itemID: number): void {
-    this.cartService.removeItem(itemID);
+  removeItem(item: CartItem): void {
+    this.cartService.removeItem(item.itemID, this.cartVariant(item));
     this.swipedItemId.set(null);
   }
 
-  updateQuantity(itemID: number, quantity: number): void {
-    this.cartService.updateQuantity(itemID, quantity);
+  updateQuantity(item: CartItem, quantity: number): void {
+    this.cartService.updateQuantity(item.itemID, quantity, this.cartVariant(item));
   }
 
-  increaseQuantity(itemID: number, currentQuantity: number): void {
-    this.updateQuantity(itemID, currentQuantity + 1);
+  increaseQuantity(item: CartItem): void {
+    this.updateQuantity(item, item.quantity + 1);
   }
 
-  decreaseQuantity(itemID: number, currentQuantity: number): void {
-    if (currentQuantity <= 1) {
-      this.removeItem(itemID);
+  decreaseQuantity(item: CartItem): void {
+    if (item.quantity <= 1) {
+      this.removeItem(item);
     } else {
-      this.updateQuantity(itemID, currentQuantity - 1);
+      this.updateQuantity(item, item.quantity - 1);
     }
   }
 
+  private cartVariant(item: CartItem): { colour?: string; size?: string; price?: number; currency?: string } {
+    return {
+      colour: item.colour,
+      size: item.size,
+      price: item.price,
+      currency: item.currency,
+    };
+  }
+
   onSwipeStart(itemID: number, event: TouchEvent): void {
     const startX = event.touches[0].clientX;