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* Cart Service
*
* Centralized business logic for cart operations.
* Handles cart retrieval, item management, and cart merging.
*/
import { prisma } from '@/lib/prisma';
import { logger } from '@/lib/logging';
import { CartItem } from '@/redux/features/cartSlice';
/**
* Database cart item with product details
*/
interface DbCartItem {
id: number;
userId: number;
productId: number;
quantity: number;
deviceId: string | null;
syncedAt: Date;
product: {
id: number;
title: string;
price: number;
discountedPrice: number;
images: Array<{
url: string;
thumbnailUrl: string;
}>;
};
}
/**
* Transformed cart item for frontend
*/
export interface TransformedCartItem {
id: number;
title: string;
price: number;
discountedPrice: number;
quantity: number;
imgs: {
thumbnails: string[];
previews: string[];
};
}
/**
* Cart response with metadata
*/
export interface CartResponse {
items: TransformedCartItem[];
syncedAt: string;
deviceId: string;
}
/**
* Merge result for cart merging operations
*/
export interface MergeResult {
merged: CartItem[];
conflicts: ConflictItem[];
action: 'merge' | 'replace' | 'skip';
message: string;
}
/**
* Conflict item for tracking merge conflicts
*/
export interface ConflictItem {
productId: number;
anonymousQuantity: number;
userQuantity: number;
resolution: 'sum' | 'user' | 'anonymous';
finalQuantity: number;
}
export class CartService {
/**
* Get cart for authenticated user
*/
static async getCart(userId: number, deviceId: string = 'default'): Promise<CartResponse> {
const cartItems = await prisma.cart.findMany({
where: { userId },
include: {
product: {
include: {
images: {
orderBy: { order: 'asc' }
}
}
}
},
orderBy: { updatedAt: 'desc' }
});
const transformedCart = this.transformDbCartItems(cartItems as unknown as DbCartItem[]);
return {
items: transformedCart,
syncedAt: new Date().toISOString(),
deviceId
};
}
/**
* Add item to cart or update quantity if exists
*/
static async addItem(
userId: number,
productId: number,
quantity: number,
deviceId: string = 'default'
) {
// Check if product exists
const product = await prisma.product.findUnique({
where: { id: productId }
});
if (!product) {
throw new Error('Product not found');
}
// 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 cartItem;
}
/**
* Update cart item quantity
*/
static async updateQuantity(
userId: number,
productId: number,
quantity: number,
deviceId: string = 'default'
) {
if (quantity <= 0) {
return this.removeItem(userId, productId);
}
const cartItem = await prisma.cart.update({
where: {
userId_productId: {
userId,
productId
}
},
data: {
quantity,
deviceId,
syncedAt: new Date()
},
include: {
product: {
include: {
images: true
}
}
}
});
return cartItem;
}
/**
* Remove item from cart
*/
static async removeItem(userId: number, productId: number) {
return prisma.cart.delete({
where: {
userId_productId: {
userId,
productId
}
}
});
}
/**
* Clear all items from cart
*/
static async clearCart(userId: number) {
return prisma.cart.deleteMany({
where: { userId }
});
}
/**
* Merge anonymous cart into user's database cart
*/
static mergeAnonymousCartToUser(
anonymousItems: CartItem[],
userItems: CartItem[]
): MergeResult {
if (!anonymousItems || anonymousItems.length === 0) {
return {
merged: userItems,
conflicts: [],
action: 'skip',
message: 'No anonymous items to merge'
};
}
const merged: CartItem[] = [...userItems];
const conflicts: ConflictItem[] = [];
let addedCount = 0;
let mergedCount = 0;
for (const anonItem of anonymousItems) {
const existingIndex = merged.findIndex((item) => item.id === anonItem.id);
if (existingIndex === -1) {
merged.push(anonItem);
addedCount++;
} else {
const existingItem = merged[existingIndex];
if (existingItem.quantity !== anonItem.quantity) {
const finalQuantity = existingItem.quantity + anonItem.quantity;
conflicts.push({
productId: anonItem.id,
anonymousQuantity: anonItem.quantity,
userQuantity: existingItem.quantity,
resolution: 'sum',
finalQuantity
});
existingItem.quantity = finalQuantity;
mergedCount++;
}
}
}
let message = 'Cart merged successfully. ';
if (addedCount > 0) {
message += `${addedCount} new item(s) added. `;
}
if (mergedCount > 0) {
message += `${mergedCount} item(s) merged with existing cart.`;
}
return {
merged,
conflicts,
action: conflicts.length > 0 || addedCount > 0 ? 'merge' : 'skip',
message: message.trim()
};
}
/**
* Apply cart merge to database
*/
static async applyCartMerge(
userId: number,
mergedItems: CartItem[],
deviceId: string = 'default'
): Promise<void> {
try {
await prisma.$transaction(async (tx) => {
// Delete existing cart items for this user
await tx.cart.deleteMany({
where: { userId }
});
// Insert merged items
if (mergedItems.length > 0) {
await tx.cart.createMany({
data: mergedItems.map((item) => ({
userId,
productId: item.id,
quantity: item.quantity,
deviceId,
syncedAt: new Date()
}))
});
}
});
} catch (error) {
logger.error('Failed to apply cart merge', error instanceof Error ? error : new Error(String(error)), {
category: 'CART',
});
throw new Error('Failed to apply cart merge to database');
}
}
/**
* Get cart items that need to be synced (have stale flag)
*/
static async getStaleCartItems(userId: number) {
return prisma.cart.findMany({
where: {
userId,
isStale: true
},
include: {
product: {
include: {
images: true
}
}
}
});
}
/**
* Mark cart items as stale (for conflict resolution)
*/
static async markCartItemsAsStale(userId: number, productIds: number[]) {
await prisma.cart.updateMany({
where: {
userId,
productId: {
in: productIds
}
},
data: {
isStale: true
}
});
}
/**
* Clear stale flags from cart items
*/
static async clearStaleFlags(userId: number) {
await prisma.cart.updateMany({
where: {
userId,
isStale: true
},
data: {
isStale: false
}
});
}
/**
* Transform database cart items to frontend format
*/
private static transformDbCartItems(dbCartItems: DbCartItem[]): TransformedCartItem[] {
return dbCartItems.map((item) => ({
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) || []
}
}));
}
/**
* Validate cart items before operations
*/
static validateCartItems(items: CartItem[]): boolean {
if (!Array.isArray(items)) {
return false;
}
return items.every(
(item) =>
item.id &&
typeof item.id === 'number' &&
item.quantity &&
typeof item.quantity === 'number' &&
item.quantity > 0
);
}
}
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