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 POST(request: Request) {
  let traceId: string;
  let rating: "helpful" | "not_helpful";
  let comment: string | null;
  let conversationId: string | null;

  try {
    const body = await request.json();
    traceId = typeof body?.traceId === "string" ? body.traceId.trim() : "";
    rating = body?.rating;
    comment = typeof body?.comment === "string" ? body.comment.trim() || null : null;
    conversationId =
      typeof body?.conversationId === "string" ? body.conversationId.trim() || null : null;
  } catch {
    return NextResponse.json({ error: "invalid_body" }, { status: 400 });
  }

  if (!/^[0-9a-f-]{36}$/i.test(traceId)) {
    return NextResponse.json({ error: "invalid_trace_id" }, { status: 400 });
  }
  if (rating !== "helpful" && rating !== "not_helpful") {
    return NextResponse.json({ error: "invalid_rating" }, { status: 400 });
  }
  if (comment && comment.length > 2000) {
    return NextResponse.json({ error: "comment_too_long" }, { status: 400 });
  }
  if (conversationId && conversationId.length > 128) {
    return NextResponse.json({ error: "conversation_id_too_long" }, { status: 400 });
  }

  const base = API_GATEWAY_URL.replace(/\/v1\/rag(?:\/query)?\/?$/, "");
  try {
    const upstream = await fetch(`${base}/v1/rag/feedback`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        trace_id: traceId,
        rating,
        comment,
        conversation_id: conversationId,
      }),
      cache: "no-store",
      signal: AbortSignal.timeout(8_000),
    });
    const payload = await upstream.json().catch(() => ({}));
    return NextResponse.json(payload, { status: upstream.status });
  } catch {
    return NextResponse.json({ error: "feedback_upstream_unavailable" }, { status: 503 });
  }
}