const knex = require('knex');
const db2g = require('db2graphql');
const { ApolloServer } = require('@apollo/server');
const { startStandaloneServer } = require('@apollo/server/standalone');
// dotenv - not used if running in docker compose
// require('dotenv').config();

// get env variables
const { DB_HOST, DB_PORT, DB_USERNAME, DB_PASSWORD, DB_DATABASE } = process.env;

const start = async (cb) => {

  /**************************************/
  const api = new db2g('mariadb', knex({
    client: 'mysql',
    connection: {
      host: DB_HOST,
      port: DB_PORT,
      user: DB_USERNAME,
      password: DB_PASSWORD,
      database: DB_DATABASE
    }
  }));
  await api.connect(DB_DATABASE); // Connects to database and extracts database schema

  // Get generated schema and resolvers
  const schema = api.getSchema();
  const resolvers = api.getResolvers();
  /**************************************/

  // Create Apollo Server and start
  if (!schema) throw new Error('Error: empty schema');
  console.log(schema);
  const server = new ApolloServer({
    typeDefs: schema,
    resolvers,
    introspection: true,
    playground: true,
  });
  startStandaloneServer(server).then(({ url }) => {
    console.log(`🚀 Server ready at ${url}`);
  });
}

start();