import { NextRequest, NextResponse } from "next/server";
import { headers } from "next/headers";
import { auth } from "@/lib/auth";
import { prisma } from "@/lib/prisma";

// Read-only lookup for the admin command menu (Ctrl/⌘+K).
const MIN_QUERY = 2;
const MAX_QUERY = 100;

export async function GET(request: NextRequest) {
  const session = await auth.api.getSession({ headers: await headers() });
  if (!session || session.user.role !== "admin") {
    return NextResponse.json({ error: "Нет доступа" }, { status: 403 });
  }

  const q = (request.nextUrl.searchParams.get("q") ?? "").trim().slice(0, MAX_QUERY);
  if (q.length < MIN_QUERY) {
    return NextResponse.json({ users: [], courses: [], lessons: [] });
  }

  const contains = { contains: q, mode: "insensitive" as const };

  const [users, courses, lessons] = await Promise.all([
    prisma.user.findMany({
      where: { OR: [{ name: contains }, { email: contains }] },
      select: { id: true, name: true, email: true, role: true },
      orderBy: { createdAt: "desc" },
      take: 8,
    }),
    prisma.course.findMany({
      where: { OR: [{ title: contains }, { slug: contains }] },
      select: { id: true, title: true, slug: true, published: true },
      orderBy: { order: "asc" },
      take: 6,
    }),
    prisma.lesson.findMany({
      where: { title: contains },
      select: {
        id: true,
        title: true,
        published: true,
        module: { select: { id: true, courseId: true, course: { select: { title: true } } } },
      },
      orderBy: { updatedAt: "desc" },
      take: 8,
    }),
  ]);

  return NextResponse.json({
    users,
    courses,
    lessons: lessons.map((l) => ({
      id: l.id,
      title: l.title,
      published: l.published,
      moduleId: l.module.id,
      courseId: l.module.courseId,
      courseTitle: l.module.course.title,
    })),
  });
}