middleware.ts

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

export async function middleware(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.pathname

  // Redirect authenticated users away from the landing page to dashboard
  if (pathname === '/' && user) {
    return NextResponse.redirect(new URL('/dashboard', request.url))
  }

  // Protect app routes — redirect unauthenticated users to sign in
  const protectedPaths = ['/dashboard', '/campaigns/new', '/my', '/onboarding']
  const isProtected = protectedPaths.some((p) => pathname.startsWith(p))

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

  // Redirect authenticated users who haven't set a display_name to onboarding
  if (user && isProtected && pathname !== '/onboarding') {
    const { data: profile } = await supabase
      .from('profiles')
      .select('display_name')
      .eq('id', user.id)
      .single()

    if (profile && !profile.display_name) {
      return NextResponse.redirect(new URL('/onboarding', request.url))
    }
  }

  return supabaseResponse
}

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