import { NextRequest, NextResponse } from "next/server";

const BACKEND = process.env.HERMES_BACKEND_URL || "http://127.0.0.1:8643";

export async function POST(req: NextRequest, { params }: { params: Promise<{ id: string }> }) {
  const { id } = await params;
  const body = await req.json();
  try {
    // Agent chat can take a while — 5 minute timeout
    const controller = new AbortController();
    const timeout = setTimeout(() => controller.abort(), 300_000);
    const res = await fetch(BACKEND + "/api/sessions/" + id + "/chat", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(body),
      signal: controller.signal,
    });
    clearTimeout(timeout);
    const data = await res.text();
    return new NextResponse(data, {
      status: res.status,
      headers: { "content-type": "application/json" },
    });
  } catch (e) {
    const msg = e instanceof Error ? e.message : "backend unreachable";
    return NextResponse.json({ error: msg }, { status: 502 });
  }
}