import type { CartEndpoint } from '.'
import type { RawVariantSpec } from '../../../types/product'

import { formatCart } from '../../utils/cart'
import { serialize } from 'cookie'

const addItem: CartEndpoint['handlers']['addItem'] = async ({
  req,
  body: { cartId, item },
  config: { restBuyerFetch, cartCookie, tokenCookie },
}) => {
  // Get token
  let token = req.cookies.get(tokenCookie)?.value
  let headers: any = {}

  // Create an order if it doesn't exist
  if (!cartId) {
    const { ID, meta } = await restBuyerFetch(
      'POST',
      `/orders/Outgoing`,
      {},
      { token }
    )

    cartId = ID

    headers = {
      'set-cookie': [
        serialize(cartCookie, cartId!, {
          maxAge: 60 * 60 * 24 * 30,
          expires: new Date(Date.now() + 60 * 60 * 24 * 30 * 1000),
          secure: process.env.NODE_ENV === 'production',
          path: '/',
          sameSite: 'lax',
        }),
      ],
    }

    if (meta?.token) {
      headers['set-cookie'].push(
        serialize(tokenCookie, meta.token?.access_token, {
          maxAge: meta.token.expires_in,
          expires: new Date(Date.now() + meta.token.expires_in * 1000),
          secure: process.env.NODE_ENV === 'production',
          path: '/',
          sameSite: 'lax',
        })
      )
    }
  }

  let specs: RawVariantSpec[] = []

  // If a variant is present, fetch its specs
  if (item.variantId !== 'undefined') {
    const { Specs } = await restBuyerFetch(
      'GET',
      `/me/products/${item.productId}/variants/${item.variantId}`,
      null,
      { token }
    )
    specs = Specs
  }

  // Add the item to the order
  await restBuyerFetch(
    'POST',
    `/orders/Outgoing/${cartId}/lineitems`,
    {
      ProductID: item.productId,
      Quantity: item.quantity,
      Specs: specs,
    },
    { token }
  )

  // Get cart & line items
  const [cart, { Items }] = await Promise.all([
    restBuyerFetch('GET', `/orders/Outgoing/${cartId}`, null, { token }),
    restBuyerFetch('GET', `/orders/Outgoing/${cartId}/lineitems`, null, {
      token,
    }),
  ])

  // Format cart
  const formattedCart = formatCart(cart, Items)

  // Return cart and headers
  return { data: formattedCart, headers }
}

export default addItem