middleware.ts

import { createServerClient } from "@supabase/ssr";
import { NextResponse, type NextRequest } from "next/server";

export async function middleware(request: NextRequest) {
  let response = NextResponse.next({
    request: {
      headers: request.headers,
    },
  });

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll();
        },
        setAll(
          cookiesToSet: Array<{
            name: string;
            value: string;
            options?: Record<string, unknown>;
          }>
        ) {
          cookiesToSet.forEach(({ name, value }) =>
            request.cookies.set(name, value)
          );
          response = NextResponse.next({
            request,
          });
          cookiesToSet.forEach(({ name, value, options }) =>
            response.cookies.set(name, value, options)
          );
        },
      },
    }
  );

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

  // 로그인이 필요한 경로들만 보호
  const protectedRoutes = ["/mypage", "/study"];
  const authRoutes = ["/login", "/signup"];

  const isProtectedRoute = protectedRoutes.some((route) =>
    request.nextUrl.pathname.startsWith(route)
  );
  const isAuthRoute = authRoutes.some((route) =>
    request.nextUrl.pathname.startsWith(route)
  );

  // 로그인 안 한 상태에서 보호된 경로 접근 시 로그인 페이지로
  if (!user && isProtectedRoute) {
    const redirectUrl = new URL("/login", request.url);
    redirectUrl.searchParams.set("redirectTo", request.nextUrl.pathname);
    return NextResponse.redirect(redirectUrl);
  }

  // 로그인한 상태에서 auth 페이지 접근 시 홈으로
  if (user && isAuthRoute) {
    return NextResponse.redirect(new URL("/", request.url));
  }

  return response;
}

export const config = {
  matcher: [
    "/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)",
  ],
};