import { prisma } from "@/lib/prisma";

export async function getCourseLessonStats(courseId: string) {
  const lessons = await prisma.lesson.count({
    where: { published: true, module: { courseId } },
  });
  return { totalLessons: lessons };
}

export async function getUserCourseProgress(userId: string, courseId: string) {
  const lessons = await prisma.lesson.findMany({
    where: { published: true, module: { courseId } },
    select: { id: true },
  });
  const total = lessons.length;
  if (total === 0) return { total: 0, completed: 0, percent: 0 };

  const completed = await prisma.lessonProgress.count({
    where: {
      userId,
      completedAt: { not: null },
      lessonId: { in: lessons.map((l) => l.id) },
    },
  });

  const percent = Math.round((completed / total) * 100);
  return { total, completed, percent };
}