import { createFileRoute, Link } from "@tanstack/react-router";
import { useQuery } from "@tanstack/react-query";
import { supabase } from "@/integrations/supabase/client";
import { useAuth } from "@/hooks/use-auth";
import { Tabs, TabsList, TabsTrigger, TabsContent } from "@/components/ui/tabs";
import { ArrowLeft, Lock, Loader2 } from "lucide-react";
import { RosterManager, GradebookGrid, GradingConfigEditor } from "@/components/gradebook";

export const Route = createFileRoute("/_authenticated/classes/$id")({
  head: () => ({ meta: [{ title: "Class — School Portal" }] }),
  component: ClassDetail,
});

function ClassDetail() {
  const { id } = Route.useParams();
  const { user, roles } = useAuth();
  const isAdmin = roles.includes("admin");

  const { data: cls, isLoading } = useQuery({
    queryKey: ["class", id],
    queryFn: async () => (await supabase.from("classes").select("*").eq("id", id).single()).data,
  });
  const isTeacher = !!cls && cls.teacher_id === user?.id;
  const canEdit = isAdmin || isTeacher;

  if (isLoading) return <div className="p-8"><Loader2 className="h-5 w-5 animate-spin text-muted-foreground" /></div>;
  if (!canEdit) return <div className="p-8"><Lock className="h-6 w-6 text-muted-foreground" /><h1 className="mt-2 text-xl font-semibold">Not available</h1><p className="text-sm text-muted-foreground">You don't have access to this class.</p></div>;

  return (
    <div className="p-6 md:p-8 max-w-5xl">
      <Link to="/classes" className="text-sm text-muted-foreground inline-flex items-center gap-1 mb-3"><ArrowLeft className="h-4 w-4" /> All classes</Link>
      <h1 className="text-2xl font-semibold">{cls?.name}</h1>

      <Tabs defaultValue="gradebook" className="mt-6">
        <TabsList>
          <TabsTrigger value="gradebook">Gradebook</TabsTrigger>
          <TabsTrigger value="roster">Roster</TabsTrigger>
          <TabsTrigger value="grading">Grading setup</TabsTrigger>
        </TabsList>
        <TabsContent value="gradebook" className="mt-4"><GradebookGrid classId={id} canEdit={canEdit} /></TabsContent>
        <TabsContent value="roster" className="mt-4"><RosterManager classId={id} canAssign={isAdmin} /></TabsContent>
        <TabsContent value="grading" className="mt-4"><GradingConfigEditor classId={id} /></TabsContent>
      </Tabs>
    </div>
  );
}