// Author: Simon-Pierre Boucher
// Contact: contact@spboucher.ai
// Project: chat.spboucher.ai

// "Stop" aborts the upstream OpenRouter stream — never fake cancellation.

import { NextResponse, type NextRequest } from "next/server";
import { requireSession } from "@/lib/auth/guard";
import { cancelGeneration, generationState } from "@/lib/generate";

export const runtime = "nodejs";

type Params = { params: Promise<{ id: string }> };

export async function POST(_req: NextRequest, { params }: Params) {
  const { unauthorized } = await requireSession();
  if (unauthorized) return unauthorized;
  const { id } = await params;
  const cancelled = cancelGeneration(id);
  const gen = generationState(id);
  if (!cancelled && !gen) {
    return NextResponse.json({ error: "Generation not found." }, { status: 404 });
  }
  return NextResponse.json({ ok: true, state: gen?.state ?? "cancelled" });
}