import { ApolloServer, ApolloServerExpressConfig } from "apollo-server-express";
import { Module } from "@nimbus/core";
import { formatError } from "./graphql.error";
import merge from 'lodash.merge';

export interface ApolloServerConfig extends ApolloServerExpressConfig {
  module?: Module,
}

/**
 * Create an apollo server compatible with GraphQL Modules
 * @param module
 * @param subscriptions
 * @param schema
 * @param apolloConfig
 */
export function createApolloServer({module, subscriptions, schema, ...apolloConfig}: ApolloServerConfig) {
 return new ApolloServer(merge({
    context: session => session,
    tracing: true,
    schema: module ? module.schema : schema,
    subscriptions: module ? module.subscriptions : subscriptions,
    formatError: formatError,
  } as ApolloServerExpressConfig, apolloConfig));
}