export interface Config {
  databaseUrl: string
  port: number
  /** Public URL users open in their browser; HTTPS here turns on secure cookies. */
  publicUrl: string
  secureCookies: boolean
  production: boolean
  /** Built web app to serve, if present. */
  staticDir: string
  /** e.g. `smtps://user:pass@smtp.example.com:465`. Without it, emails are printed to the log (development only). */
  smtpUrl: string | undefined
  mailFrom: string
  uploadDir: string
  maxUploadBytes: number
}

export function loadConfig(env: NodeJS.ProcessEnv = process.env): Config {
  const publicUrl = env.PUBLIC_URL ?? `http://localhost:${env.PORT ?? 3000}`
  return {
    databaseUrl: env.DATABASE_URL ?? 'pglite://./data/pglite',
    port: Number(env.PORT ?? 3000),
    publicUrl,
    secureCookies: publicUrl.startsWith('https://'),
    production: env.NODE_ENV === 'production',
    staticDir: env.STATIC_DIR ?? 'dist',
    smtpUrl: env.SMTP_URL || undefined,
    mailFrom: env.MAIL_FROM ?? 'Open SafetyLog EHS <no-reply@localhost>',
    uploadDir: env.UPLOAD_DIR ?? './data/uploads',
    maxUploadBytes: Number(env.MAX_UPLOAD_MB ?? 10) * 1024 * 1024,
  }
}