/**
 * 认证 Cookie 配置
 * 生产: AUTH_COOKIE_DOMAIN 实现跨子域 SSO
 * 本地 IP: 自动设置 domain 实现多端口共享（3000/3001/3002）
 */

const COOKIE_NAME = "pb_session";
const COOKIE_MAX_AGE = 60 * 60 * 24 * 365;

export { COOKIE_NAME, COOKIE_MAX_AGE };

export function getHostFromRequest(request: { headers: { get: (k: string) => string | null } }): string {
  const host = request.headers.get("host") || request.headers.get("x-forwarded-host") || "";
  return host.split(",")[0].trim().replace(/:\d+$/, "");
}

export function getCookieOptions(clear = false, requestHost?: string) {
  const isProd = process.env.NODE_ENV === "production";
  const domain = process.env.AUTH_COOKIE_DOMAIN?.trim();
  const opts: Record<string, unknown> = {
    path: "/",
    maxAge: clear ? 0 : COOKIE_MAX_AGE,
    secure: isProd,
    sameSite: "lax" as const,
    httpOnly: true,
  };
  if (domain && isProd) {
    opts.domain = domain;
  } else if (!isProd && requestHost && /^(\d{1,3}\.){3}\d{1,3}$/.test(requestHost)) {
    opts.domain = requestHost;
  }
  return opts;
}