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180 lines
6.0 KiB
180 lines
6.0 KiB
import { Injectable, HttpException, HttpStatus, Inject, forwardRef } from "@nestjs/common"; |
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import { InjectModel } from "@nestjs/sequelize"; |
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import { Cart } from "./entities/cart.entity"; |
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import { Product } from "src/products/entities/product.entity"; |
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import { WalletService } from "src/wallet/wallet.service"; |
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import { InvoiceService } from "src/invoice/invoice.service"; |
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import { Invoice } from "src/invoice/entities/invoice.entity"; |
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@Injectable() |
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export class CartService { |
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constructor( |
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@InjectModel(Cart) private readonly cartModel: typeof Cart, |
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@InjectModel(Invoice) private readonly invoiceModel: typeof Invoice, |
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@InjectModel(Product) private readonly productModel: typeof Product, |
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private readonly walletService: WalletService, |
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@Inject(forwardRef(() => InvoiceService)) |
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private invoiceService: InvoiceService, |
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) {} |
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//create a cart and add item to cart |
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async createAndAddItemToCart(addToCartDto: { userId: number; productId: number; quantity: number }): Promise<{ message: string; cartItem: Cart }> { |
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const { userId, productId, quantity } = addToCartDto; |
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if (!userId || !productId || !quantity || isNaN(Number(quantity)) || Number(quantity) <= 0) { |
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throw new HttpException("Invalid parameters: userId, productId, and a positive quantity are required.", HttpStatus.BAD_REQUEST); |
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} |
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const product = await this.productModel.findByPk(productId); |
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if (!product) { |
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throw new HttpException("Product not found!", HttpStatus.NOT_FOUND); |
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} |
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let invoice = await this.invoiceModel.findOne({ where: { userId, status: "pending" } }); |
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if (!invoice) { |
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invoice = await this.invoiceService.createInvoiceFromCart(userId); |
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} |
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const invoiceId = invoice.id; |
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let cart = await this.cartModel.findOne({ where: { userId, productId, status: "open" } }); |
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console.log(cart); |
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if (!cart) { |
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cart = await this.cartModel.create({ |
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userId, |
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productId, |
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invoiceId, |
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quantity, |
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productPrice: product.price, |
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status: "open", |
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}); |
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await cart.save(); |
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} else { |
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cart.quantity += Number(quantity); |
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await cart.save(); |
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} |
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await this.invoiceService.updateTotalPayment(userId); |
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return { |
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message: cart.id ? "Product quantity updated in cart successfully!" : "Product added to cart successfully!", |
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cartItem: cart, |
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}; |
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} |
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// Get user's cart |
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async getUserCart(userId: number): Promise<{ cartItems: Cart[]; totalPrice: number }> { |
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if (!userId) { |
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throw new HttpException("User ID is required.", HttpStatus.BAD_REQUEST); |
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} |
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const cartItems = await this.cartModel.findAll({ |
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where: { userId }, |
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include: [ |
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{ |
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model: Product, |
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attributes: [], |
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}, |
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], |
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}); |
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if (!cartItems || cartItems.length === 0) { |
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throw new HttpException("No cart items found for the specified user.", HttpStatus.NOT_FOUND); |
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} |
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const totalPrice = cartItems.reduce((sum, item) => sum + (Number(item.productPrice * item.quantity) || 0), 0); |
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return { cartItems, totalPrice }; |
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} |
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// Update cart item quantity |
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async updateCart(userId: number, productId: number, quantity: number): Promise<Cart> { |
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const cartItem = await this.cartModel.findOne({ where: { userId, productId } }); |
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if (!cartItem) { |
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throw new HttpException("Product not found in the cart.", HttpStatus.NOT_FOUND); |
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} |
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cartItem.quantity = quantity; |
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await cartItem.save(); |
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await this.invoiceService.updateTotalPayment(userId); |
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return cartItem; |
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} |
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// Remove an item from cart |
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async removeFromCart(userId: number, productId: number): Promise<{ message: string }> { |
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const cartItem = await this.cartModel.findOne({ where: { userId, productId } }); |
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if (!cartItem) { |
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throw new HttpException("Product not found in the cart.", HttpStatus.NOT_FOUND); |
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} |
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await cartItem.destroy(); |
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await this.invoiceService.updateTotalPayment(userId); |
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return { message: "Item deleted from your cart successfully." }; |
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} |
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//delete whole cart |
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async clearCart(userId: number): Promise<void> { |
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await this.cartModel.destroy({ where: { userId } }); |
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} |
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//order(clearCart disable) |
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async processOrder(userId: number, totalAmount: number): Promise<{ message: string; invoice: Invoice }> { |
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try { |
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const carts = await this.cartModel.findAll({ where: { userId, status: "open" } }); |
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if (!carts || carts.length === 0) { |
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throw new HttpException("No open carts found for this user.", HttpStatus.NOT_FOUND); |
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} |
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let invoice: Invoice | null = null; |
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for (const cart of carts) { |
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const invoiceId = cart.invoiceId; |
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invoice = await this.invoiceModel.findOne({ where: { id: invoiceId, userId } }); |
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if (invoice && invoice.status === "paid") { |
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return { |
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message: `Order for cart ID ${cart.id} has already been processed.`, |
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invoice, |
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}; |
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} |
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} |
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await this.walletService.processPayment(userId, totalAmount); |
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for (const cartItem of carts) { |
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const { productId, quantity } = cartItem; |
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const product = await this.productModel.findOne({ where: { id: productId } }); |
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if (!product) { |
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throw new HttpException(`Product with ID ${productId} not found.`, HttpStatus.NOT_FOUND); |
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} |
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if (product.quantity < quantity) { |
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throw new HttpException(`Insufficient stock for product ID ${productId}.`, HttpStatus.BAD_REQUEST); |
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} |
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product.quantity -= quantity; |
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await product.save(); |
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} |
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for (const cart of carts) { |
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cart.status = "closed"; |
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await cart.save(); |
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} |
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if (invoice) { |
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invoice.status = "paid"; |
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await invoice.save(); |
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} |
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return { message: "Order processed successfully!", invoice }; |
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} catch (error) { |
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console.error(error); |
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if (error instanceof HttpException) { |
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throw error; |
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} else { |
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throw new HttpException(`An error occurred while processing the order: ${error.message}`, HttpStatus.INTERNAL_SERVER_ERROR); |
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} |
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} |
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} |
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}
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