import { clerkMiddleware } from "@clerk/nextjs/server";
import { NextResponse } from "next/server";

export default clerkMiddleware(async (auth, req) => {
  const { pathname } = req.nextUrl;
  
  // 定义公开路由
  const publicRoutes = [
    "/",
    "/favicon.ico",
    "/api/courses",
  ];
  
  // 检查是否是公开路由
  const isPublicRoute = publicRoutes.some(route => pathname === route) ||
    pathname.match(/^\/api\/courses\/[^\/]+\/classrooms$/) ||
    pathname.match(/^\/api\/classrooms\/[^\/]+\/assignments$/) ||
    pathname.match(/^\/api\/assignments\/[^\/]+\/submissions$/) ||
    pathname.match(/^\/api\/assignments\/[^\/]+\/submissions\/upload$/);
  
  // 如果不是公开路由，则需要认证
  if (!isPublicRoute) {
    const { userId } = await auth();
    if (!userId && pathname.startsWith("/api/")) {
      return NextResponse.json({ error: "未授权" }, { status: 401 });
    }
    if (!userId) {
      return NextResponse.redirect(new URL("/", req.url));
    }
  }
  
  return NextResponse.next();
});

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