import { ApolloClient } from 'apollo-client'
import {
  InMemoryCache,
  IntrospectionFragmentMatcher
} from 'apollo-cache-inmemory'
import { createHttpLink } from 'apollo-link-http'
import { setContext } from 'apollo-link-context'
import { provide } from '@vue/composition-api'
import { DefaultApolloClient } from '@vue/apollo-composable'
import introspectionQueryResultData from '../fragmentTypes.json'
import { useAuth } from './auth'

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

const fragmentMatcher = new IntrospectionFragmentMatcher({
  introspectionQueryResultData
})

const cache = new InMemoryCache({ fragmentMatcher })

const httpLink = createHttpLink({
  uri: apiUrl
})

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

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

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 ({ app }) {
  app.setup = () => {
    provide(DefaultApolloClient, instance)
  }
}