import { ApolloClient, createHttpLink, InMemoryCache } from '@apollo/client/core'
import { setContext } from '@apollo/client/link/context'
import { useAuth } from './auth'

const apiUrl = process.env.graphqlApi || '/query'

const cache = new InMemoryCache()

const httpLink = createHttpLink({
  uri: apiUrl
})

const getToken = (options) => {
  const { getTokenSilently } = useAuth()
  return getTokenSilently(options)
}

const authLink = setContext((_, { headers }) => {
  return getToken()
    .then(token => ({
      headers: {
        ...headers,
        authorization: token ? `Bearer ${token}` : ''
      }
    })).catch(() => {
      return {}
    })
})

const link = authLink.concat(httpLink)

const instance = new ApolloClient({
  connectToDevTools: true,
  link,
  cache,
  defaultOptions: {
    query: {
      fetchPolicy: 'cache-and-network'
    },
    watchQuery: {
      fetchPolicy: 'cache-and-network'
    }
  }
})

export default function (_, inject) {
  inject('apollo', instance)
}