import ApolloClient, { ApolloClientOptions } from 'apollo-client';
import { ApolloLink } from 'apollo-link';
import { ContextSetter } from 'apollo-link-context';
import { ErrorHandler } from 'apollo-link-error';
import { IncomingHttpHeaders } from 'http';
import { AppProps } from 'next/app';

declare global {
  namespace NodeJS {
    interface Process {
      browser?: boolean;
    }
  }
}

export interface ApolloLinks {
  http: ApolloLink;
  setContext?: ContextSetter;
  onError?: ErrorHandler;
  ws?(): ApolloLink;
}

export interface InitApolloOptions<TCache> {
  client:
    | ApolloClient<TCache>
    | ((
        options: { headers?: IncomingHttpHeaders; link?: ApolloLink }
      ) => ApolloClientOptions<TCache> | ApolloClient<TCache>);
  link?:
    | ApolloLinks
    | ((options: { headers?: IncomingHttpHeaders }) => ApolloLinks);
}

export interface WithApolloState<TCache> {
  data?: TCache;
}

export interface WithApolloProps<TCache> extends AppProps {
  apollo: ApolloClient<TCache>;
  apolloState: WithApolloState<TCache>;
}