import { readFileSync } from "fs";
import { ApolloServer } from "@apollo/server";
import { MergedResolvers } from "../../src/MergedResolvers";
import { UnoptimizedInMemoryRepository } from "../../src/repositories/UnoptimizedInMemoryRepository";
import { beforeEach } from "@jest/globals";
import { ServerContext } from "../../src/ServerContext";
import { ETANotificationScheduler } from "../../src/notifications/schedulers/ETANotificationScheduler";


function setUpTestServer() {
  // Leaving this separate from the main server in case
  // configuration changes
  const typeDefs = readFileSync("./schema.graphqls", "utf8");
  return new ApolloServer({
    typeDefs,
    resolvers: MergedResolvers,
  });
}

/**
 * Returns a `ServerContext` object which can be passed to requests
 * for testing.
 */
export function setupTestServerContext() {
  const context: { [key: string] : any } = {};

  beforeEach(() => {
    context.repository = new UnoptimizedInMemoryRepository();
    context.notificationService = new ETANotificationScheduler(context.repository);
  });

  return context as ServerContext;
}

/**
 * Returns an object which holds a test server.
 * This server is reset before every test.
 * Tests should keep a reference to the holder object,
 * and not destructure it.
 */
export function setupTestServerHolder() {
  const holder: { [key: string]: any } = {};

  beforeEach(() => {
    holder.testServer = setUpTestServer();
  });

  return holder as { testServer: ApolloServer };
}