// app/api/playlists/[id]/route.ts
import { NextResponse } from "next/server";
import { prisma } from "../../../../lib/prisma";
import { getServerSession } from "next-auth";
import { authOptions } from "../../../../lib/auth-options";

export async function GET(req: Request, context: any) {
  try {
    // Unwrap params (Next may provide a Promise)
    let params = context?.params;
    if (typeof params?.then === "function") params = await params;

    const id = params?.id;
    if (!id) return NextResponse.json({ error: "Missing playlist id" }, { status: 400 });

    const session = await getServerSession(authOptions);
    if (!session?.user?.email) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const user = await prisma.user.findUnique({
      where: { email: session.user.email },
    });
    if (!user) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const playlist = await prisma.playlist.findUnique({
      where: { id },
      include: {
        videos: {
          include: {
            uploader: {
              select: {
                id: true,
                name: true,
                image: true,
              },
            },
          },
          orderBy: { index: "asc" },
        },
        course: true,
      },
    });

    if (!playlist) return NextResponse.json({ error: "Not found" }, { status: 404 });

    const enrolled = await prisma.enrollment.findUnique({
      where: { userId_courseId: { userId: user.id, courseId: playlist.courseId } },
    });
    if (!enrolled) return NextResponse.json({ error: "Forbidden" }, { status: 403 });

    return NextResponse.json({ playlist });
  } catch (err: any) {
    console.error("GET /api/playlists/[id] error:", err);
    return NextResponse.json({ error: "Server error" }, { status: 500 });
  }
}