import { db } from "../../db/index";
import { courses, topics } from "../../db/schema";
import { inArray, eq } from "drizzle-orm";

export default defineEventHandler(async () => {
  const allCourses = await db.query.courses.findMany();

  if (allCourses.length === 0) return [];

  const courseIds = allCourses.map((c) => c.id);
  const allTopics = await db.query.topics.findMany({
    where: inArray(topics.courseId, courseIds),
  });

  const topicCountByCourse = new Map<string, number>();
  const readyCountByCourse = new Map<string, number>();

  for (const t of allTopics) {
    topicCountByCourse.set(t.courseId, (topicCountByCourse.get(t.courseId) ?? 0) + 1);
    if (t.status === "ready") {
      readyCountByCourse.set(t.courseId, (readyCountByCourse.get(t.courseId) ?? 0) + 1);
    }
  }

  return allCourses.map((c) => ({
    id: c.id,
    status: c.status,
    stage: c.stage,
    topicCount: topicCountByCourse.get(c.id) ?? 0,
    readyTopicCount: readyCountByCourse.get(c.id) ?? 0,
  }));
});