add to cart c:

components/core/Layout/Layout.tsx

@@ -1,6 +1,8 @@
 import cn from 'classnames'
 import { FC } from 'react'
 import s from './Layout.module.css'
+import { CommerceProvider } from '@lib/bigcommerce'
+import { CartProvider } from '@lib/bigcommerce/cart'
 import { Navbar, Featurebar } from '@components/core'
 import { Container, Sidebar } from '@components/ui'
 import { CartSidebarView } from '@components/cart'
@@ -35,9 +37,13 @@ const CoreLayout: FC<Props> = ({ className, children }) => {
 }
 
 const Layout: FC<Props> = (props) => (
-  <UIProvider>
-    <CoreLayout {...props} />
-  </UIProvider>
+  <CommerceProvider>
+    <CartProvider>
+      <UIProvider>
+        <CoreLayout {...props} />
+      </UIProvider>
+    </CartProvider>
+  </CommerceProvider>
 )
 
 export default Layout

components/product/ProductView/ProductView.tsx

@@ -4,6 +4,9 @@ import s from './ProductView.module.css'
 import { Button } from '@components/ui'
 import { Swatch } from '@components/product'
 import { Colors } from '@components/ui/types'
+import type { Product } from '@lib/bigcommerce/api/operations/get-product'
+import useAddItem from '@lib/bigcommerce/cart/use-add-item'
+
 interface ProductData {
   name: string
   images: any
@@ -12,17 +15,31 @@ interface ProductData {
   colors?: any[]
   sizes?: any[]
 }
+
 interface Props {
   className?: string
   children?: any
   productData: ProductData
+  product: Product
 }
 
-const ProductView: FC<Props> = ({ productData, className }) => {
-  const rootClassName = cn(s.root, className)
-  const colors: Colors[] = ['pink', 'black', 'white']
+const COLORS: Colors[] = ['pink', 'black', 'white']
+
+const ProductView: FC<Props> = ({ product, productData, className }) => {
+  const addItem = useAddItem()
+  const addToCart = () => {
+    addItem({
+      item: {
+        productId: product.entityId,
+        variantId: product.variants.edges?.[0]?.node.entityId!,
+      },
+    })
+  }
+
+  console.log('PRODUCT', product)
+
   return (
-    <div className={rootClassName}>
+    <div className={cn(s.root, className)}>
       <div className="absolute">
         <h1 className="px-8 py-2 bg-violet text-white font-bold text-3xl">
           {productData.name}
@@ -38,8 +55,8 @@ const ProductView: FC<Props> = ({ productData, className }) => {
         <section className="pb-4">
           <h2 className="uppercase font-medium">Color</h2>
           <div className="flex flex-row py-4">
-            {colors.map((c) => (
-              <Swatch color={c} />
+            {COLORS.map((c) => (
+              <Swatch key={c} color={c} />
             ))}
           </div>
         </section>
@@ -57,7 +74,9 @@ const ProductView: FC<Props> = ({ productData, className }) => {
           <p>{productData.description}</p>
         </section>
         <section className="pb-4">
-          <Button className={s.button}>Add to Cart</Button>
+          <Button type="button" className={s.button} onClick={addToCart}>
+            Add to Cart
+          </Button>
         </section>
       </div>
     </div>

lib/bigcommerce/api/cart.ts

@@ -5,11 +5,17 @@ import createApiHandler, {
 } from './utils/create-api-handler'
 import { BigcommerceApiError } from './utils/errors'
 
-type Cart = any
+export type Item = {
+  productId: number
+  variantId: number
+  quantity?: number
+}
+
+export type Cart = any
 
 const METHODS = ['GET', 'POST', 'PUT', 'DELETE']
 
-const cartApi: BigcommerceApiHandler = async (req, res, config) => {
+const cartApi: BigcommerceApiHandler<Cart> = async (req, res, config) => {
   if (!isAllowedMethod(req, res, METHODS)) return
 
   const { cookies } = req
@@ -27,7 +33,7 @@ const cartApi: BigcommerceApiHandler = async (req, res, config) => {
       } catch (error) {
         if (error instanceof BigcommerceApiError && error.status === 404) {
           // Remove the cookie if it exists but the cart wasn't found
-          res.setHeader('Set-Cookie', getCartCookie(name))
+          res.setHeader('Set-Cookie', getCartCookie(config.cartCookie))
         } else {
           throw error
         }
@@ -38,10 +44,11 @@ const cartApi: BigcommerceApiHandler = async (req, res, config) => {
 
     // Create or add a product to the cart
     if (req.method === 'POST') {
-      const { product } = req.body
+      const item: Item | undefined = req.body?.item
 
-      if (!product) {
+      if (!item) {
         return res.status(400).json({
+          data: null,
           errors: [{ message: 'Missing product' }],
         })
       }
@@ -49,28 +56,32 @@ const cartApi: BigcommerceApiHandler = async (req, res, config) => {
       const options = {
         method: 'POST',
         body: JSON.stringify({
-          line_items: [parseProduct(product)],
+          line_items: [parseItem(item)],
         }),
       }
       const { data } = cartId
         ? await config.storeApiFetch(`/v3/carts/${cartId}/items`, options)
         : await config.storeApiFetch('/v3/carts', options)
 
+      console.log('API DATA', data)
+
       // Create or update the cart cookie
       res.setHeader(
         'Set-Cookie',
-        getCartCookie(name, data.id, config.cartCookieMaxAge)
+        getCartCookie(config.cartCookie, data.id, config.cartCookieMaxAge)
       )
 
-      return res.status(200).json({ done: { data } })
+      return res.status(200).json({ data })
     }
   } catch (error) {
+    console.error(error)
+
     const message =
       error instanceof BigcommerceApiError
         ? 'An unexpected error ocurred with the Bigcommerce API'
         : 'An unexpected error ocurred'
 
-    res.status(500).json({ errors: [{ message }] })
+    res.status(500).json({ data: null, errors: [{ message }] })
   }
 }
 
@@ -90,10 +101,10 @@ function getCartCookie(name: string, cartId?: string, maxAge?: number) {
   return serialize(name, cartId || '', options)
 }
 
-const parseProduct = (product: any) => ({
-  quantity: product.quantity,
-  product_id: product.productId,
-  variant_id: product.variantId,
+const parseItem = (item: Item) => ({
+  quantity: item.quantity || 1,
+  product_id: item.productId,
+  variant_id: item.variantId,
 })
 
 export default createApiHandler(cartApi)

lib/bigcommerce/api/operations/get-product.ts

@@ -33,11 +33,14 @@ export const getProductQuery = /* GraphQL */ `
   ${productInfoFragment}
 `
 
-export interface GetProductResult<T> {
-  product?: T extends GetProductQuery
-    ? Extract<T['site']['route']['node'], { __typename: 'Product' }>
-    : unknown
-}
+export type Product = Extract<
+  GetProductQuery['site']['route']['node'],
+  { __typename: 'Product' }
+>
+
+export type GetProductResult<
+  T extends { product?: any } = { product?: Product }
+> = T
 
 export type ProductVariables = Images &
   ({ path: string; slug?: never } | { path?: never; slug: string })
@@ -45,7 +48,7 @@ export type ProductVariables = Images &
 async function getProduct(opts: {
   variables: ProductVariables
   config?: BigcommerceConfig
-}): Promise<GetProductResult<GetProductQuery>>
+}): Promise<GetProductResult>
 
 async function getProduct<T, V = any>(opts: {
   query: string
@@ -61,7 +64,7 @@ async function getProduct({
   query?: string
   variables: ProductVariables
   config?: BigcommerceConfig
-}): Promise<GetProductResult<GetProductQuery>> {
+}): Promise<GetProductResult> {
   config = getConfig(config)
   const variables: GetProductQueryVariables = {
     ...config.imageVariables,

lib/bigcommerce/api/utils/create-api-handler.ts

@@ -1,12 +1,17 @@
 import type { NextApiHandler, NextApiRequest, NextApiResponse } from 'next'
 import { BigcommerceConfig, getConfig } from '..'
 
-export type BigcommerceApiHandler = (
+export type BigcommerceApiHandler<T = any> = (
   req: NextApiRequest,
-  res: NextApiResponse,
+  res: NextApiResponse<BigcommerceApiResponse<T>>,
   config: BigcommerceConfig
 ) => void | Promise<void>
 
+export type BigcommerceApiResponse<T> = {
+  data: T | null
+  errors?: { message: string }[]
+}
+
 export default function createApiHandler(handler: BigcommerceApiHandler) {
   return function getApiHandler({
     config,

lib/bigcommerce/api/utils/fetch-store-api.ts

@@ -30,7 +30,7 @@ export default async function fetchStoreApi<T>(
 
   const contentType = res.headers.get('Content-Type')
 
-  if (contentType?.includes('application/json')) {
+  if (!contentType?.includes('application/json')) {
     throw new BigcommerceApiError(
       `Fetch to Bigcommerce API failed, expected JSON content but found: ${contentType}`,
       res

lib/bigcommerce/cart/index.tsx

@@ -7,7 +7,11 @@ import {
 export type Cart = {}
 
 export const CartProvider: FC = ({ children }) => {
-  return <CommerceCartProvider url="/api/cart">{children}</CommerceCartProvider>
+  return (
+    <CommerceCartProvider url="/api/bigcommerce/cart">
+      {children}
+    </CommerceCartProvider>
+  )
 }
 
 export function useCart() {

lib/bigcommerce/cart/use-add-item.tsx

@@ -1,11 +1,23 @@
 import type { Fetcher } from '@lib/commerce'
 import { default as useCartAddItem } from '@lib/commerce/cart/use-add-item'
+import type { Item } from '../api/cart'
 import { Cart } from '.'
 
-async function fetcher(fetch: Fetcher<Cart>, { item }: { item: any }) {
-  return fetch({ url: '/api/cart', method: 'POST', body: { item } })
+export type { Item }
+
+function fetcher(fetch: Fetcher<Cart>, { item }: { item: Item }) {
+  if (
+    item.quantity &&
+    (!Number.isInteger(item.quantity) || item.quantity! < 1)
+  ) {
+    throw new Error(
+      'The item quantity has to be a valid integer greater than 0'
+    )
+  }
+
+  return fetch({ url: '/api/bigcommerce/cart', method: 'POST', body: { item } })
 }
 
 export default function useAddItem() {
-  return useCartAddItem<Cart, { item: any }>(fetcher)
+  return useCartAddItem<Cart, { item: Item }>(fetcher)
 }

lib/bigcommerce/index.tsx

@@ -33,6 +33,7 @@ export const bigcommerceConfig: CommerceConfig = {
 
     if (res.ok) {
       const { data } = await res.json()
+      console.log('DATA', data)
       return data
     }
 
@@ -44,12 +45,11 @@ export type BigcommerceConfig = Partial<CommerceConfig>
 
 export type BigcommerceProps = {
   children?: ReactNode
-  config: BigcommerceConfig
-}
+} & BigcommerceConfig
 
-export function CommerceProvider({ children, config }: BigcommerceProps) {
+export function CommerceProvider({ children, ...config }: BigcommerceProps) {
   return (
-    <CoreCommerceProvider config={{ ...config, ...bigcommerceConfig }}>
+    <CoreCommerceProvider config={{ ...bigcommerceConfig, ...config }}>
       {children}
     </CoreCommerceProvider>
   )

pages/product/[slug].tsx

@@ -9,6 +9,11 @@ export async function getStaticProps({
   params,
 }: GetStaticPropsContext<{ slug: string }>) {
   const { product } = await getProduct({ variables: { slug: params!.slug } })
+
+  if (!product) {
+    throw new Error(`Product with slug '${params!.slug}' not found`)
+  }
+
   const productData = {
     name: 'T-Shirt',
     description: `
@@ -51,7 +56,7 @@ export default function Slug({
   return router.isFallback ? (
     <h1>Loading...</h1>
   ) : (
-    <ProductView productData={productData} />
+    <ProductView product={product} productData={productData} />
   )
 }