Latest updarte

src/lib/cart.ts

@@ -0,0 +1,76 @@
+import { cookies } from "next/headers";
+import { db } from "@/lib/db";
+
+export const CART_COOKIE = "bistrousky_cart";
+
+export interface CartItem {
+  variantId: string;
+  quantity: number;
+}
+
+// ── Čtení / zápis cookie ──────────────────────────────────────────────────
+
+export async function getCartItems(): Promise<CartItem[]> {
+  const store = await cookies();
+  const raw = store.get(CART_COOKIE)?.value;
+  if (!raw) return [];
+  try {
+    return JSON.parse(raw) as CartItem[];
+  } catch {
+    return [];
+  }
+}
+
+export async function setCartItems(items: CartItem[]) {
+  const store = await cookies();
+  store.set(CART_COOKIE, JSON.stringify(items), {
+    httpOnly: true,
+    sameSite: "lax",
+    path: "/",
+    maxAge: 60 * 60 * 24 * 30, // 30 dní
+  });
+}
+
+// ── Košík s daty z DB ─────────────────────────────────────────────────────
+
+export interface CartItemFull {
+  variantId: string;
+  quantity: number;
+  variant: {
+    id: string;
+    name: string;
+    price: number;
+    stock: number;
+    product: {
+      id: string;
+      name: string;
+      slug: string;
+      image: string | null;
+    };
+  };
+}
+
+export async function getCart(): Promise<CartItemFull[]> {
+  const items = await getCartItems();
+  if (items.length === 0) return [];
+
+  const variantIds = items.map((i) => i.variantId);
+  const variants = await db.productVariant.findMany({
+    where: { id: { in: variantIds } },
+    include: {
+      product: { select: { id: true, name: true, slug: true, image: true } },
+    },
+  });
+
+  return items
+    .map((item) => {
+      const variant = variants.find((v) => v.id === item.variantId);
+      if (!variant) return null;
+      return { variantId: item.variantId, quantity: item.quantity, variant };
+    })
+    .filter(Boolean) as CartItemFull[];
+}
+
+export function cartTotal(items: CartItemFull[]): number {
+  return items.reduce((sum, item) => sum + item.variant.price * item.quantity, 0);
+}