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import {
withAuth,
withErrorHandling,
successResponse,
createdResponse,
validationErrorResponse,
ApiError,
ApiSuccessResponse,
ApiErrorResponse
} from "@/lib/api";
import { prisma } from "@/lib/prisma";
import { addToCartSchema, validateInput } from "@/lib/validation-schemas";
import { Session } from "next-auth";
import { RouteContext } from "@/lib/api/middleware";
import { NextResponse } from "next/server";
// Type for cart item with product images
interface CartItemWithProduct {
id: number;
quantity: number;
product: {
id: number;
title: string;
price: number;
discountedPrice: number | null;
images: Array<{ thumbnailUrl: string | null; url: string }>;
};
}
interface CartResponse {
items: Array<{
id: number;
title: string;
price: number;
discountedPrice: number | null;
quantity: number;
imgs: {
thumbnails: string[];
previews: string[];
};
}>;
syncedAt: string;
deviceId: string;
}
// GET /api/cart - Get user's cart items
async function handleGet(
request: NextRequest,
_context: RouteContext | undefined,
session: Session
): Promise<NextResponse<ApiSuccessResponse<CartResponse>>> {
const userId = session.user.id;
const deviceId = request.headers.get("x-device-id") || "default";
const cartItems = await prisma.cart.findMany({
where: { userId },
include: {
product: {
include: {
images: {
orderBy: { order: "asc" }
}
}
}
},
orderBy: { updatedAt: "desc" }
});
// Transform to match frontend CartItem type
const transformedCart = cartItems.map((item: CartItemWithProduct) => ({
id: item.product.id,
title: item.product.title,
price: item.product.price,
discountedPrice: item.product.discountedPrice,
quantity: item.quantity,
imgs: {
thumbnails: item.product.images.map((img) => img.thumbnailUrl || img.url),
previews: item.product.images.map((img) => img.url)
}
}));
return successResponse({
items: transformedCart,
syncedAt: new Date().toISOString(),
deviceId
});
}
// POST /api/cart - Add item to cart
async function handlePost(
request: NextRequest,
_context: RouteContext | undefined,
session: Session
): Promise<NextResponse<ApiSuccessResponse<unknown> | ApiErrorResponse>> {
const body = await request.json();
const userId = session.user.id;
const deviceId = request.headers.get("x-device-id") || "default";
// Validate input
const validation = validateInput(addToCartSchema, body);
if (!validation.success) {
return validationErrorResponse("Validation failed", validation.errors);
}
const { productId, quantity } = validation.data!;
// Check if product exists
const product = await prisma.product.findUnique({
where: { id: productId }
});
if (!product) {
throw ApiError.notFound("Product");
}
// Check if item already in cart
const existingCartItem = await prisma.cart.findUnique({
where: {
userId_productId: {
userId,
productId
}
}
});
let cartItem;
if (existingCartItem) {
// Update quantity and sync info
cartItem = await prisma.cart.update({
where: { id: existingCartItem.id },
data: {
quantity: existingCartItem.quantity + quantity,
deviceId,
syncedAt: new Date()
},
include: {
product: {
include: {
images: true
}
}
}
});
} else {
// Create new cart item
cartItem = await prisma.cart.create({
data: {
userId,
productId,
quantity,
deviceId,
syncedAt: new Date()
},
include: {
product: {
include: {
images: true
}
}
}
});
}
return createdResponse(cartItem);
}
export const GET = withErrorHandling(withAuth(handleGet));
export const POST = withErrorHandling(withAuth(handlePost));
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