import { useCallback } from 'react'
import { MutationHook } from '@commerce/utils/types'
import useLogin, { UseLogin } from '@commerce/auth/use-login'
import { CommerceError, ValidationError } from '@commerce/utils/errors'
import useCustomer from '../customer/use-customer'
import { LoginMutation, LoginMutationVariables } from '../schema'

export const loginMutation = /* GraphQL */ `
  mutation login($username: String!, $password: String!) {
    login(username: $username, password: $password) {
      __typename
      ... on CurrentUser {
        id
      }
      ... on ErrorResult {
        errorCode
        message
      }
    }
  }
`

export default useLogin as UseLogin<typeof handler>

export const handler: MutationHook<null, {}, any> = {
  fetchOptions: {
    query: loginMutation,
  },
  async fetcher({ input: { email, password }, options, fetch }) {
    if (!(email && password)) {
      throw new CommerceError({
        message: 'A email and password are required to login',
      })
    }

    const variables: LoginMutationVariables = {
      username: email,
      password,
    }

    const { login } = await fetch<LoginMutation>({
      ...options,
      variables,
    })

    if (login.__typename !== 'CurrentUser') {
      throw new ValidationError(login)
    }

    return null
  },
  useHook: ({ fetch }) => () => {
    const { revalidate } = useCustomer()

    return useCallback(
      async function login(input) {
        const data = await fetch({ input })
        await revalidate()
        return data
      },
      [fetch, revalidate]
    )
  },
}