import { Cart } from '../types'
import { CommerceError } from '@commerce/utils/errors'

import { CheckoutLinesAdd, CheckoutLinesUpdate, CheckoutCreate, CheckoutError, Checkout, Maybe, CheckoutLineDelete } from '../schema'

import { normalizeCart } from './normalize'
import throwUserErrors from './throw-user-errors'

export type CheckoutQuery = {
  checkout: Checkout
  errors?: Array<CheckoutError>
}

export type CheckoutPayload = CheckoutLinesAdd | CheckoutLinesUpdate | CheckoutCreate | CheckoutQuery | CheckoutLineDelete

const checkoutToCart = (checkoutPayload?: Maybe<CheckoutPayload>): Cart => {
  if (!checkoutPayload) {
    throw new CommerceError({
      message: 'Missing checkout payload from response',
    })
  }

  const checkout = checkoutPayload?.checkout
  throwUserErrors(checkoutPayload?.errors)

  if (!checkout) {
    throw new CommerceError({
      message: 'Missing checkout object from response',
    })
  }

  return normalizeCart(checkout)
}

export default checkoutToCart