'use strict';

const express = require('express');
const graphqlHTTP = require('express-graphql');
const {
  GraphQLSchema,
  GraphQLObjectType,
  GraphQLID,
  GraphQLString,
  GraphQLInt,
  GraphQLBoolean
} = require('graphql');
const { getVideoById } = require('./src/data/index');

const PORT = process.env.PORT || 3000;

const server = express();

const videoType = new GraphQLObjectType({
  name: 'Video',
  description: 'A video on egghead.io',
  fields: {
    id: {
      type: GraphQLID,
      description: 'The ID of the video'
    },
    title: {
      type: GraphQLString,
      description: 'The title of the video'
    },
    duration: {
      type: GraphQLInt,
      description: 'The duration of the video, in seconds',
    },
    watched: {
      type: GraphQLBoolean,
      description: 'Whether or not the viewer has watched the video'
    }
  }
});

const queryType = new GraphQLObjectType({
  name: 'QueryType',
  description: 'The root query  type',
  fields: {
    video: {
      type: videoType,
      args: {
        id: {
          type: GraphQLID,
          description: 'The ID of the video'
        }
      },
      resolve: (_, args) => {
        return getVideoById(args.id);
      }
    }
  }
});

const schema = new GraphQLSchema({
  query: queryType
  // Also available:
  // mutation: ...
  // subscription: ...
});

server.use('/graphql', graphqlHTTP({
  schema,
  graphiql: true
}));

server.listen(PORT, () => {
  console.log(`Listening on http://localhost:${PORT}`);
});