import { headers } from "next/headers";
import { auth } from "@/lib/auth";
import { redirect } from "next/navigation";
import { prisma } from "@/lib/prisma";
import Link from "next/link";

export default async function CuratorDashboard() {
  const session = await auth.api.getSession({ headers: await headers() });
  if (!session) redirect("/login");

  const [pending, total, recentFeedbacks] = await Promise.all([
    prisma.homeworkSubmission.count({ where: { feedbacks: { none: {} } } }),
    prisma.homeworkSubmission.count(),
    prisma.homeworkFeedback.count({
      where: {
        createdAt: { gte: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000) },
        curatorId: session.user.id,
      },
    }),
  ]);

  return (
    <div className="p-8 max-w-3xl">
      <h1 className="text-2xl font-bold mb-1">Обзор</h1>
      <p className="text-sm mb-8" style={{ color: "var(--muted-foreground)" }}>Панель куратора</p>

      <div className="grid grid-cols-3 gap-4 mb-8">
        <StatCard label="Ожидают проверки" value={pending} accent={pending > 0} />
        <StatCard label="Всего сдано" value={total} />
        <StatCard label="Проверено за 7 дней" value={recentFeedbacks} />
      </div>

      {pending > 0 ? (
        <Link href="/curator/homework" className="btn-aubade btn-aubade-accent inline-flex items-center gap-2 px-5 py-2.5 text-sm">
          Перейти к проверке ({pending}) →
        </Link>
      ) : (
        <div className="card-aubade p-8 text-center">
          <p className="text-3xl mb-2">✓</p>
          <p className="font-bold">Все работы проверены</p>
          <p className="text-sm mt-1" style={{ color: "var(--muted-foreground)" }}>Новых заданий нет</p>
        </div>
      )}
    </div>
  );
}

function StatCard({ label, value, accent }: { label: string; value: number; accent?: boolean }) {
  return (
    <div className="card-aubade p-4">
      <p className="text-3xl font-bold" style={{ color: accent ? "oklch(0.577 0.245 27.325)" : "var(--foreground)" }}>
        {value}
      </p>
      <p className="text-xs mt-1 uppercase tracking-widest" style={{ color: "var(--muted-foreground)" }}>{label}</p>
    </div>
  );
}