middleware.js

import { createServerClient } from '@supabase/ssr'
import { NextResponse } from 'next/server'

function getSupabaseConfig() {
  return {
    url: process.env.NEXT_PUBLIC_SUPABASE_URL,
    anonKey: process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY || process.env.NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY,
  }
}

export async function middleware(request) {
  const { url, anonKey } = getSupabaseConfig()
  let response = NextResponse.next({ request })

  if (!url || !anonKey) {
    return response
  }

  const supabase = createServerClient(url, anonKey, {
    cookies: {
      getAll() {
        return request.cookies.getAll()
      },
      setAll(cookiesToSet) {
        cookiesToSet.forEach(({ name, value, options }) => {
          request.cookies.set(name, value)
          response.cookies.set(name, value, options)
        })
      },
    },
  })

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

  const pathname = request.nextUrl.pathname
  const isProtected = pathname.startsWith('/student/dashboard') || pathname.startsWith('/admin/dashboard')

  if (isProtected && !user) {
    const loginUrl = new URL('/login', request.url)
    loginUrl.searchParams.set('next', pathname)
    return NextResponse.redirect(loginUrl)
  }

  return response
}

export const config = {
  matcher: ['/student/:path*', '/admin/:path*'],
}