import React, { Component } from 'react';
import { Redirect } from 'react-router-dom';

import { ApolloProvider } from 'react-apollo';
import { InMemoryCache } from 'apollo-cache-inmemory';
import ApolloClient from 'apollo-client';
import { setContext } from 'apollo-link-context';
import { WebSocketLink } from 'apollo-link-ws';
import { HttpLink } from 'apollo-link-http';
import { split } from 'apollo-link';
import { getMainDefinition } from 'apollo-utilities';

import {
  HASURA_GQE_ENDPOINT_WS,
  HASURA_GQE_ENDPOINT_HTTP,
} from '../config';

class AuthGate extends Component {

  constructor(props) {
    super(props);

    const wsurl = `${HASURA_GQE_ENDPOINT_WS}/v1alpha1/graphql`;
    const httpurl = `${HASURA_GQE_ENDPOINT_HTTP}/v1alpha1/graphql`;

    const jwt_token = localStorage.getItem('jwt_token');

    // create the web socket link
    const wsLink = new WebSocketLink({
      uri: wsurl,
      options: {
        reconnect: true,
        connectionParams: () => ({
          headers: {
            authorization: jwt_token ? `Bearer ${jwt_token}` : '',
          },
        }),
      },
    });

    let httpLink = new HttpLink({
      uri: httpurl,
    });

    const authLink = setContext((a, { headers }) => {
      const token = localStorage.getItem('jwt_token');
      return {
        headers: {
          ...headers,
          authorization: token ? `Bearer ${token}` : '',
        },
      };
    });

    const link = split(
      // split based on operation type
      ({ query }) => {
        const { kind, operation } = getMainDefinition(query);
        return kind === 'OperationDefinition' && operation === 'subscription';
      },
      wsLink,
      httpLink
    );

    const client = new ApolloClient({
      link: authLink.concat(link),
      cache: new InMemoryCache(),
    });
   
    this.client = client;
  }

  render() {
    if (!this.isAuthenticated()) {
      return (
        <Redirect
          to={{
            pathname: '/sign-in',
            state: { from: this.props.location },
          }}
        />
      );
    }

    return (
      <ApolloProvider client={this.client}>
        {this.props.children}
      </ApolloProvider>
    );
  }
}
export default AuthGate;