import { inspect } from 'util';
import {
  graphql,
  GraphQLEnumType,
  GraphQLID,
  GraphQLInterfaceType,
  GraphQLObjectType,
  GraphQLList,
  GraphQLNonNull,
  GraphQLSchema,
  GraphQLString,
} from 'graphql';

const messages = [
  { id: '1', parent: null, content: 'Message 1' },
  { id: '2', parent: '1', content: 'Message 2' },
  { id: '3', parent: '1', content: 'Message 3' },
  { id: '4', parent: '1', content: 'Message 4' },
  { id: '5', parent: '2', content: 'Message 5' },
  { id: '6', parent: '2', content: 'Message 6' },
  { id: '7', parent: '2', content: 'Message 7' },
  { id: '8', parent: '6', content: 'Message 8' },
  { id: '9', parent: '6', content: 'Message 9' },
];

function getMessage(messageID) {
  return messages.find((message) => message.id === messageID);
}
function getComments(messageID) {
  return messages.filter((message) => message.parent === messageID);
}

const Message = new GraphQLObjectType({
  name: 'Message',
  fields: () => ({
    comments: {
      type: new GraphQLList(Message),
      resolve(message) {
        return getComments(message.id);
      },
    },
    content: {
      type: GraphQLString,
    },
  }),
});


const Query = new GraphQLObjectType({
  name: 'Query',
  fields: {
    message: {
      type: Message,
      args: {
        id: {
          type: GraphQLID,
        }
      },
      resolve(root, { id }) {
        return getMessage(id);
      },
    },
  },
});

export const Schema = new GraphQLSchema({
  query: Query
});

graphql(Schema, `
{
  message(id: 1) {
    content
    comments {
      content
      comments {
        content
        comments {
          content
        }
      }
    }
  }
}
`).then((result) => {
  console.log(inspect(result, {depth: null}));
});