import { db, EnrollmentStatus, PostType } from '@nice/common';

// 更新课程评价统计
export async function updateCourseReviewStats(courseId: string) {
  const reviews = await db.post.findMany({
    where: {
      courseId,
      type: PostType.COURSE_REVIEW,
      deletedAt: null,
    },
    select: { rating: true },
  });
  const numberOfReviews = reviews.length;
  const averageRating =
    numberOfReviews > 0
      ? reviews.reduce((sum, review) => sum + review.rating, 0) /
        numberOfReviews
      : 0;

  return db.course.update({
    where: { id: courseId },
    data: {
      // numberOfReviews,
      //averageRating,
    },
  });
}

// 更新课程注册统计
export async function updateCourseEnrollmentStats(courseId: string) {
  const completedEnrollments = await db.enrollment.count({
    where: {
      courseId,
      status: EnrollmentStatus.COMPLETED,
    },
  });
  const totalEnrollments = await db.enrollment.count({
    where: { courseId },
  });
  const completionRate =
    totalEnrollments > 0 ? (completedEnrollments / totalEnrollments) * 100 : 0;
  return db.course.update({
    where: { id: courseId },
    data: {
      // numberOfStudents: totalEnrollments,
      // completionRate,
    },
  });
}