import { useCallback } from 'react'
import { HookFetcherContext, MutationHookContext } from '@commerce/utils/types'
import { CommerceError, ValidationError } from '@commerce/utils/errors'
import useUpdateItem, { UseUpdateItem } from '@commerce/cart/use-update-item'
import {
  Cart,
  CartItemBody,
  LineItem,
  UpdateCartItemBody,
} from '@commerce/types'
import useCart from './use-cart'
import {
  AdjustOrderLineMutation,
  AdjustOrderLineMutationVariables,
} from '../schema'
import { cartFragment } from '../api/fragments/cart'
import { normalizeCart } from '../lib/normalize'

export const adjustOrderLineMutation = /* GraphQL */ `
  mutation adjustOrderLine($orderLineId: ID!, $quantity: Int!) {
    adjustOrderLine(orderLineId: $orderLineId, quantity: $quantity) {
      __typename
      ...Cart
      ... on ErrorResult {
        errorCode
        message
      }
    }
  }
  ${cartFragment}
`

export default useUpdateItem as UseUpdateItem<typeof handler>

export const handler = {
  fetchOptions: {
    query: adjustOrderLineMutation,
  },
  async fetcher(context: HookFetcherContext<UpdateCartItemBody<CartItemBody>>) {
    const { input, options, fetch } = context
    const variables: AdjustOrderLineMutationVariables = {
      quantity: input.item.quantity || 1,
      orderLineId: input.itemId,
    }
    const { adjustOrderLine } = await fetch<AdjustOrderLineMutation>({
      ...options,
      variables,
    })

    if (adjustOrderLine.__typename === 'Order') {
      return normalizeCart(adjustOrderLine)
    }
    throw new CommerceError(adjustOrderLine)
  },
  useHook: ({
    fetch,
  }: MutationHookContext<Cart | null, UpdateCartItemBody<CartItemBody>>) => (
    ctx: {
      item?: LineItem
      wait?: number
    } = {}
  ) => {
    const { item } = ctx
    const { mutate } = useCart()

    return useCallback(
      async function addItem(input: CartItemBody) {
        const itemId = item?.id
        const productId = input.productId ?? item?.productId
        const variantId = input.productId ?? item?.variantId
        if (!itemId || !productId || !variantId) {
          throw new ValidationError({
            message: 'Invalid input used for this operation',
          })
        }
        const data = await fetch({
          input: {
            item: {
              productId,
              variantId,
              quantity: input.quantity,
            },
            itemId,
          },
        })
        await mutate(data, false)
        return data
      },
      [fetch, mutate]
    )
  },
}