/** 浏览器可读的 API 根（scheme + host + port），不含路径。生产环境务必配置 NEXT_PUBLIC_API_ORIGIN。 */
export function getPublicApiOrigin(): string {
  const o =
    process.env.NEXT_PUBLIC_API_ORIGIN ||
    (process.env.NODE_ENV === 'development' ? 'http://127.0.0.1:8000' : '');
  if (!o) {
    throw new Error('NEXT_PUBLIC_API_ORIGIN is not set');
  }
  return o.replace(/\/$/, '');
}

export function getOAuthClientId(): string {
  const id =
    process.env.NEXT_PUBLIC_OAUTH_CLIENT_ID ||
    (process.env.NODE_ENV === 'development' ? 'spa' : '');
  if (!id) {
    throw new Error('NEXT_PUBLIC_OAUTH_CLIENT_ID is not set');
  }
  return id;
}

export function getOAuthRedirectUri(): string {
  const u =
    process.env.NEXT_PUBLIC_OAUTH_REDIRECT_URI ||
    (process.env.NODE_ENV === 'development' ? 'http://localhost:3000/oauth/callback' : '');
  if (!u) {
    throw new Error('NEXT_PUBLIC_OAUTH_REDIRECT_URI is not set');
  }
  return u;
}