Stage 1: Course/Module/Lesson CRUD admin UI with TipTap editor

src/app/admin/courses/actions.ts

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+"use server";
+
+import { prisma } from "@/lib/prisma";
+import { headers } from "next/headers";
+import { auth } from "@/lib/auth";
+import { redirect } from "next/navigation";
+import { revalidatePath } from "next/cache";
+
+async function requireAdmin() {
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session || session.user.role !== "admin") throw new Error("Forbidden");
+}
+
+function slugify(str: string): string {
+  const map: Record<string, string> = {
+    а:"a",б:"b",в:"v",г:"g",д:"d",е:"e",ё:"yo",ж:"zh",з:"z",и:"i",й:"y",
+    к:"k",л:"l",м:"m",н:"n",о:"o",п:"p",р:"r",с:"s",т:"t",у:"u",ф:"f",
+    х:"kh",ц:"ts",ч:"ch",ш:"sh",щ:"shch",ъ:"",ы:"y",ь:"",э:"e",ю:"yu",я:"ya",
+  };
+  return str.toLowerCase()
+    .replace(/[а-яё]/g, (c) => map[c] ?? c)
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-|-$/g, "");
+}
+
+export async function createCourse(formData: FormData) {
+  await requireAdmin();
+  const title = formData.get("title") as string;
+  const slug = (formData.get("slug") as string).trim() || slugify(title);
+  const description = (formData.get("description") as string) || null;
+
+  const course = await prisma.course.create({
+    data: { title, slug, description },
+  });
+
+  revalidatePath("/admin/courses");
+  redirect(`/admin/courses/${course.id}`);
+}
+
+export async function updateCourse(courseId: string, formData: FormData) {
+  await requireAdmin();
+  const title = formData.get("title") as string;
+  const slug = formData.get("slug") as string;
+  const description = (formData.get("description") as string) || null;
+  const published = formData.get("published") === "true";
+  const coverImage = (formData.get("coverImage") as string) || null;
+
+  await prisma.course.update({
+    where: { id: courseId },
+    data: { title, slug, description, published, coverImage },
+  });
+
+  revalidatePath("/admin/courses");
+  revalidatePath(`/admin/courses/${courseId}`);
+}
+
+export async function deleteCourse(courseId: string) {
+  await requireAdmin();
+  await prisma.course.delete({ where: { id: courseId } });
+  revalidatePath("/admin/courses");
+  redirect("/admin/courses");
+}