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

export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url);
  const classId = searchParams.get("classId");
  const type = searchParams.get("type");

  if (!classId) {
    return NextResponse.json({ error: "classId is required" }, { status: 400 });
  }

  if (type && type !== "DECK" && type !== "QUIZ") {
    return NextResponse.json({ error: "Invalid type" }, { status: 400 });
  }

  const whereClause: any = { classId };
  if (type) {
    whereClause.type = type;
  }

  try {
    const groups = await prisma.materialGroup.findMany({
      where: whereClause,
      orderBy: { sortOrder: "asc" },
    });
    return NextResponse.json(groups);
  } catch (error) {
    return NextResponse.json({ error: "Failed to fetch material groups" }, { status: 500 });
  }
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const { classId, name, type } = body;

    if (!classId || !name || (type !== "DECK" && type !== "QUIZ")) {
      return NextResponse.json({ error: "Invalid input" }, { status: 400 });
    }

    const maxOrder = await prisma.materialGroup.aggregate({
      where: { classId, type },
      _max: { sortOrder: true },
    });
    const sortOrder = (maxOrder._max.sortOrder ?? -1) + 1;

    const group = await prisma.materialGroup.create({
      data: { classId, name, type, sortOrder },
    });

    return NextResponse.json(group, { status: 201 });
  } catch (error) {
    return NextResponse.json({ error: "Failed to create material group" }, { status: 500 });
  }
}