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import { ApolloServer } from '@apollo/server';
import { startStandaloneServer } from '@apollo/server/standalone';
import DataLoader from 'dataloader';

const typeDefs = `#graphql
  type User { id: ID!, name: String!, posts: [Post!]! }
  type Post { id: ID!, title: String!, author: User! }
  type Query { users: [User!]!, post(id: ID!): Post }
  type Mutation { createPost(title: String!, authorId: ID!): Post! }
  type Subscription { postCreated: Post! }
`;

const resolvers = {
  Query: {
    users: () => db.users.findMany(),
    post: (_, { id }) => db.posts.findById(id),
  },
  User: {
    posts: ({ id }, _, { loaders }) => loaders.postsByUser.load(id),
  },
};

const server = new ApolloServer({ typeDefs, resolvers });