import ApolloClient, {addTypename} from 'apollo-client';
import {networkInterface} from './transport';
import {SubscriptionClient, addGraphQLSubscriptions} from 'subscriptions-transport-ws';

let client;

export function getClient() {
  if (client) {
    return client;
  }

  const protocol = location.protocol === 'https:' ? 'wss' : 'ws';
  const wsClient = new SubscriptionClient(`${protocol}://${location.host}/api/v1/live`, {
    reconnect: true
  });

  const networkInterfaceWithSubscriptions = addGraphQLSubscriptions(
    networkInterface,
    wsClient,
  );

  client = new ApolloClient({
    connectToDevTools: true,
    addTypename: true,
    queryTransformer: addTypename,
    dataIdFromObject: (result) => {
      if (result.id && result.__typename) { // eslint-disable-line no-underscore-dangle
        return `${result.__typename}_${result.id}`; // eslint-disable-line no-underscore-dangle
      }
      return null;
    },
    networkInterface: networkInterfaceWithSubscriptions,
  });

  return client;
}