import express from 'express';

import cors from 'cors';

import { createHandler } from 'graphql-http/lib/use/express';

import { buildSchema } from 'graphql'

const schema = `#graphql

type Query {

hello: String!

schema: String!

random: Float!

isDev: Boolean! @deprecated(reason: "process.env variable does not seem to be set!")

rollDice(numDice: Int = 3, numSides: Int): [Int]

}

`

const rootValue = {

hello: () => {

return "Express & graphql-http server"

},

schema: () => {

return schema

},

random: () => {

return Math.random()

},

isDev: () => {

return process.env.ENV === 'development'

},

rollDice: ({ numDice, numSides }) => {

let output = []

for (let i = 0; i < numDice; i++) {

output.push(1 + Math.floor(Math.random() * (numSides || 6)))

}

return output

},

}

const app = express();

app.use(cors());

app.all('/graphql', createHandler({

schema: buildSchema(schema),

rootValue

}));

app.listen({ port: 4000 });

console.log('🚀 GraphQL server listening to port 4000');

console.log('Test URL:');

console.log('http://localhost:4000/graphql');

console.log('');

console.log('Test "{ hello }" with Postman!');

console.log('Test "{ hello }" with the React /frontend');

console.log('cd frontend');

console.log('npm install');

console.log('npm start');