// @flow

import type { Config } from './types'

export const createConfig = (defaults: Object = {}): Config => ({
  mainframe_url:
    process.env.MAINFRAME_URL ||
    defaults.mainframe_url ||
    'https://api.mainframe.com/bots/v1',
  secret: process.env.SECRET || '',
  server_port: process.env.PORT
    ? parseInt(process.env.PORT, 10)
    : defaults.server_port || 4000,
  server_url: process.env.SERVER_URL || defaults.server_url,
  username: process.env.USERNAME || defaults.username,
})

export const validateConfig = (config: Config) => {
  if (!config.secret) {
    throw new Error('Missing secret')
  }
  if (!config.server_url) {
    throw new Error('Missing server URL')
  }
  if (!config.username) {
    throw new Error('Missing username')
  }
}