import { execute, makePromise, ApolloLink } from 'apollo-link';
import { HttpLink } from 'apollo-link-http';
import gql from 'graphql-tag';
const { includeCredentials } = require('./middleware');
import { onError } from 'apollo-link-error';
import { default as webAuth} from '../auth';

const defaultGraphUri = '/graph/';
const httpLink = new HttpLink({ uri: defaultGraphUri, fetch: includeCredentials, credentials: 'same-origin' });
const errorLink = onError(({ graphQLErrors, networkError, operation, forward }) => {
      if (graphQLErrors) {
        console.log('GraphQL errors:', graphQLErrors);
        // for (let err of graphQLErrors) {
        //   switch (err.extensions.code) {
        //     case 'UNAUTHENTICATED':
        //       // error code is set to UNAUTHENTICATED
        //       // when AuthenticationError thrown in resolver
        //
        //       // modify the operation context with a new token
        //   }
        // }
      }
      if (networkError) {
        if (networkError.statusCode === 401) {
          webAuth.checkSession((response) => {
            const oldHeaders = operation.getContext().headers;
            operation.setContext({
              headers: {
                ...oldHeaders,
                authorization: webAuth.idToken(),
              },
            });
            return forward(operation);
          }, (err) => {
            console.log(err);
          });
        }
      }
    }
);

export const createQuery = (query, variables) => { // eslint-disable-line
  const operation = {
    query: gql(query),
    variables: variables
  };
  return makePromise(execute(ApolloLink.from([errorLink, httpLink]), operation));
};