'user strict';

const express = require('express');
const graphqlHTTP = require('express-graphql');
const {
  GraphQLSchema,
  GraphQLObjectType,
  GraphQLID,
  GraphQLString,
  GraphQLInt,
  GraphQLBoolean
} = require('graphql');

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,
      resolve: () => new Promise((resolve) => {
        resolve({
          id: 'a',
          title: 'GraphQL',
          duration:  180,
          watched: false
        });
      })
    }
  }
});

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

const videoA = {
  id: 'a',
  title: 'Create a GraphQL schema',
  duration: 120,
  watched: true
};

const videoB = {
  id: 'b',
  title: 'Ember.js CLI',
  duration: 240,
  watched: false
};

const videos = [videoA, videoB];

const resolvers = {
  video: () => ({
    id: () => '1',
    title: () => 'Foo',
    duration: () => 180,
    watched: () => true
  }),
  videos: () => videos
};

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

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