import { createServerClient } from "@supabase/ssr";
import { NextResponse, type NextRequest } from "next/server";
import {
  PUBLIC_AUTH_PAGES,
  AUTH_ROUTES,
  RECOVERY_COOKIE_NAME,
} from "@/features/auth/constants";

/**
 * 서버 사이드 인증 상태를 관리하고 보호된 라우트를 처리합니다.
 */
export async function updateSession(request: NextRequest) {
  let supabaseResponse = NextResponse.next({ request });

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll();
        },
        setAll(cookiesToSet) {
          cookiesToSet.forEach(({ name, value }) =>
            request.cookies.set(name, value),
          );
          supabaseResponse = NextResponse.next({ request });
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options),
          );
        },
      },
    },
  );

  const {
    data: { user },
  } = await supabase.auth.getUser();

  const { pathname } = request.nextUrl;
  const recoveryCookie = request.cookies.get(RECOVERY_COOKIE_NAME)?.value;

  if (recoveryCookie && !user) {
    const response = NextResponse.redirect(
      new URL(AUTH_ROUTES.LOGIN, request.url),
    );
    response.cookies.delete(RECOVERY_COOKIE_NAME);
    return response;
  }

  const isRecoveryRoute =
    pathname.startsWith(AUTH_ROUTES.RESET_PASSWORD) ||
    pathname.startsWith(AUTH_ROUTES.AUTH_CONFIRM);

  if (recoveryCookie && !isRecoveryRoute) {
    return NextResponse.redirect(
      new URL(AUTH_ROUTES.RESET_PASSWORD, request.url),
    );
  }

  const isAuthPage = PUBLIC_AUTH_PAGES.some((page) =>
    pathname.startsWith(page),
  );

  if (!user && !isAuthPage) {
    return NextResponse.redirect(new URL(AUTH_ROUTES.LOGIN, request.url));
  }

  if (
    user &&
    isAuthPage &&
    pathname !== AUTH_ROUTES.RESET_PASSWORD &&
    !recoveryCookie
  ) {
    return NextResponse.redirect(new URL(AUTH_ROUTES.HOME, request.url));
  }

  return supabaseResponse;
}