import { useApolloClient, useMutation } from '@apollo/react-hooks'
import gql from 'graphql-tag'

const MULTIPLE_UPLOAD_MUTATION = gql`
  mutation multipleUpload($files: [Upload!]!) {
    multipleUpload(files: $files) {
      id
    }
  }
`

export const UploadFileList = () => {
  const [multipleUploadMutation] = useMutation(MULTIPLE_UPLOAD_MUTATION)
  const apolloClient = useApolloClient()

  const onChange = ({ target: { validity, files } }) =>
    validity.valid &&
    multipleUploadMutation({ variables: { files } }).then(() => {
      apolloClient.resetStore()
    })

  return <input type="file" multiple required onChange={onChange} />
}