import { NextRequest, NextResponse } from "next/server";
import * as quizService from "@/services/quizService";
import { quizImportRequestSchema } from "@/lib/validation/importSchemas";
import { readLimitedJson, RequestTooLargeError } from "@/lib/limitedJson";

export async function POST(request: NextRequest) {
  let body: unknown;
  try {
    body = await readLimitedJson(request);
  } catch (error) {
    if (error instanceof RequestTooLargeError) {
      return NextResponse.json({ error: error.message }, { status: 413 });
    }
    throw error;
  }

  const parsed = quizImportRequestSchema.safeParse(body);
  if (!parsed.success) {
    return NextResponse.json(
      {
        error: "Invalid quiz import. SATA questions need at least two correct options.",
        details: parsed.error.issues,
      },
      { status: 400 }
    );
  }

  try {
    const quiz = await quizService.createQuizSetFromImport(
      parsed.data.classId,
      parsed.data.data,
      parsed.data.name,
      parsed.data.groupId ?? null
    );
    return NextResponse.json(quiz, { status: 201 });
  } catch (error) {
    if (error instanceof quizService.QuizContentValidationError) {
      return NextResponse.json({ error: error.message }, { status: error.status });
    }
    console.error("Failed to create quiz", error);
    return NextResponse.json({ error: "Failed to create quiz" }, { status: 500 });
  }
}