import { auth } from "@/lib/auth";
import { pipelineEvents } from "@/lib/claude";

export async function GET(
  request: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  const session = await auth();
  if (!session) return new Response("Unauthorized", { status: 401 });

  const { id } = await params;
  const encoder = new TextEncoder();

  const stream = new ReadableStream({
    start(controller) {
      const handler = (event: Record<string, unknown>) => {
        controller.enqueue(
          encoder.encode(`data: ${JSON.stringify(event)}\n\n`)
        );
      };

      pipelineEvents.on(id, handler);

      // Keep connection alive
      const keepAlive = setInterval(() => {
        controller.enqueue(encoder.encode(`: keepalive\n\n`));
      }, 15000);

      request.signal.addEventListener("abort", () => {
        pipelineEvents.off(id, handler);
        clearInterval(keepAlive);
        controller.close();
      });
    },
  });

  return new Response(stream, {
    headers: {
      "Content-Type": "text/event-stream",
      "Cache-Control": "no-cache",
      Connection: "keep-alive",
    },
  });
}