Stage 2: student lesson viewer, Kinescope player, PDF files, prev/next nav, My Courses dashboard

src/app/(student)/courses/[slug]/layout.tsx

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+import { headers } from "next/headers";
+import { auth } from "@/lib/auth";
+import { redirect } from "next/navigation";
+import { prisma } from "@/lib/prisma";
+import { notFound } from "next/navigation";
+import { CourseSidebar } from "@/components/student/course-sidebar";
+
+interface Props {
+  children: React.ReactNode;
+  params: Promise<{ slug: string }>;
+}
+
+export default async function CourseLayout({ children, params }: Props) {
+  const { slug } = await params;
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session) redirect("/login");
+
+  const course = await prisma.course.findUnique({
+    where: { slug, published: true },
+    include: {
+      modules: {
+        orderBy: { order: "asc" },
+        include: {
+          lessons: {
+            where: { published: true },
+            orderBy: { order: "asc" },
+            select: { id: true, title: true },
+          },
+        },
+      },
+    },
+  });
+
+  if (!course) notFound();
+
+  const enrollment = await prisma.courseEnrollment.findUnique({
+    where: { userId_courseId: { userId: session.user.id, courseId: course.id } },
+  });
+
+  if (!enrollment) redirect("/dashboard");
+
+  if (enrollment.expiresAt && enrollment.expiresAt < new Date()) {
+    redirect("/dashboard?expired=1");
+  }
+
+  return (
+    <div className="flex flex-1">
+      <CourseSidebar course={course} />
+      <main className="flex-1 min-w-0 overflow-y-auto">
+        {children}
+      </main>
+    </div>
+  );
+}