import { db } from "../../../db/index";
import { courses, uploads, topics, lessons, quizQuestions, userProgress } from "../../../db/schema";
import { eq } from "drizzle-orm";
import { verifyLicenseKey } from "../../../utils/license";
import { rm } from "fs/promises";
import { resolve } from "path";

export default defineEventHandler(async (event) => {
  const key = getHeader(event, "x-license-key") ?? "";
  if (!verifyLicenseKey(key)) {
    throw createError({ statusCode: 401, message: "Invalid or expired license key" });
  }

  const id = getRouterParam(event, "id")!;

  const course = await db.query.courses.findFirst({ where: eq(courses.id, id) });
  if (!course) throw createError({ statusCode: 404, message: "Course not found" });

  // delete child records in order
  const courseTopics = await db.query.topics.findMany({ where: eq(topics.courseId, id) });

  for (const topic of courseTopics) {
    await db.delete(lessons).where(eq(lessons.topicId, topic.id));
    await db.delete(quizQuestions).where(eq(quizQuestions.topicId, topic.id));
    await db.delete(userProgress).where(eq(userProgress.topicId, topic.id));
  }

  await db.delete(topics).where(eq(topics.courseId, id));
  await db.delete(uploads).where(eq(uploads.courseId, id));
  await db.delete(userProgress).where(eq(userProgress.courseId, id));
  await db.delete(courses).where(eq(courses.id, id));

  // clean up uploaded files on disk
  try {
    const uploadDir = resolve(process.cwd(), "uploads", id);
    await rm(uploadDir, { recursive: true, force: true });
  } catch {
    // non-fatal
  }

  return { ok: true };
});