global.PWD = process.env.NODE_PWD || process.cwd()

function readFromEnv(columns, defaults) {
  const missing = []

  const result = columns.reduce((result, variable) => {
    const value = (result[variable] = process.env[variable] || defaults[variable])

    if (!value) {
      missing.push(variable)
    }

    return result
  }, {})

  if (missing.length) {
    throw new Error(`Missing required env variables: ${missing.join(', ')}`)
  }

  return result
}

const defaults = {
  NODE_ENV: 'development',
  POSTGRES_HOST: 'localhost',
}

export default {
  ...readFromEnv(['NODE_ENV', 'POSTGRES_HOST'], defaults),
}