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

export async function proxy(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 protectedPaths = ["/dashboard", "/train", "/runs", "/datasets", "/models", "/settings"]
  const isProtected = protectedPaths.some((p) => pathname.startsWith(p))

  const devPreview = process.env.NEXT_PUBLIC_DEV_PREVIEW === "true"

  if (!user && isProtected && !devPreview) {
    const url = request.nextUrl.clone()
    url.pathname = "/auth/login"
    url.searchParams.set("next", pathname)
    return NextResponse.redirect(url)
  }

  if (user && pathname.startsWith("/auth") && !devPreview) {
    return NextResponse.redirect(new URL("/dashboard", request.url))
  }

  return supabaseResponse
}

export const config = {
  matcher: ["/((?!_next/static|_next/image|favicon.ico|api/).*)"],
}