import { NextResponse } from "next/server";

export const runtime = "nodejs";

const API_GATEWAY_URL =
  process.env.API_GATEWAY_URL ?? process.env.AI_SERVICE_URL ?? "http://localhost:8000";

export async function GET(request: Request) {
  const { searchParams } = new URL(request.url);
  const conversationId = searchParams.get("conversation_id")?.trim() || "";

  if (!conversationId) {
    return NextResponse.json({ items: [] });
  }

  try {
    const targetUrl = API_GATEWAY_URL.includes("/v1/rag")
      ? `${API_GATEWAY_URL.replace(/\/query$/, "/history")}?conversation_id=${encodeURIComponent(conversationId)}`
      : `${API_GATEWAY_URL}/v1/rag/history?conversation_id=${encodeURIComponent(conversationId)}`;

    const upstream = await fetch(targetUrl, {
      method: "GET",
      headers: {
        "X-Client-Version": "1.0.0",
      },
      cache: "no-store",
    });

    if (!upstream.ok) {
      return NextResponse.json({ items: [] });
    }

    const data = await upstream.json();
    return NextResponse.json(data);
  } catch {
    return NextResponse.json({ items: [] });
  }
}