const DEFAULT_PORT = 5174
const DEFAULT_SQLITE_PATH = './leo-typing.db'

function parsePort(value: string | undefined): number {
  if (!value) return DEFAULT_PORT

  const port = Number.parseInt(value, 10)
  if (Number.isNaN(port) || port < 1 || port > 65535) {
    throw new Error(`Invalid PORT value: ${value}`)
  }

  return port
}

function parseBoolean(value: string | undefined, fallback: boolean): boolean {
  if (!value) return fallback

  switch (value.toLowerCase()) {
    case '1':
    case 'true':
    case 'yes':
    case 'on':
      return true
    case '0':
    case 'false':
    case 'no':
    case 'off':
      return false
    default:
      throw new Error(`Invalid boolean value: ${value}`)
  }
}

const appOrigin = process.env.APP_ORIGIN ? new URL(process.env.APP_ORIGIN) : null

export const runtimeConfig = {
  host: process.env.HOST || '127.0.0.1',
  port: parsePort(process.env.PORT),
  sqlitePath: process.env.SQLITE_PATH || DEFAULT_SQLITE_PATH,
  appOrigin,
  sessionCookieSecure: parseBoolean(
    process.env.SESSION_COOKIE_SECURE,
    appOrigin?.protocol === 'https:',
  ),
}

export function resolveOrigin(req: Request): string {
  return runtimeConfig.appOrigin?.origin || new URL(req.url).origin
}

export function resolveRpId(req: Request): string {
  return runtimeConfig.appOrigin?.hostname || new URL(req.url).hostname
}