import { NextRequest, NextResponse } from "next/server";
import { appendFile, mkdir } from "fs/promises";
import { dirname } from "path";

export const dynamic = "force-dynamic";
export const runtime = "nodejs";

const LOG_PATH =
  process.env.MC_DASHBOARD_ERROR_LOG ||
  "/home/minecraft/logs/mc-dashboard/errors.log";

let ensured = false;
async function ensureLog() {
  if (ensured) return;
  try {
    await mkdir(dirname(LOG_PATH), { recursive: true });
    ensured = true;
  } catch {}
}

// Very light throttle: drop any request shorter than THROTTLE_MS after the last
const THROTTLE_MS = 200;
let lastWrite = 0;

export async function POST(req: NextRequest) {
  const now = Date.now();
  if (now - lastWrite < THROTTLE_MS) {
    return NextResponse.json({ ok: true, throttled: true });
  }
  lastWrite = now;

  let body: unknown;
  try {
    body = await req.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
  }

  const b = body as Record<string, unknown>;
  const entry = {
    ts: new Date().toISOString(),
    type: String(b.type || "unknown").slice(0, 40),
    message: String(b.message || "").slice(0, 500),
    stack: typeof b.stack === "string" ? b.stack.slice(0, 4000) : undefined,
    url: typeof b.url === "string" ? b.url.slice(0, 500) : undefined,
    userAgent: req.headers.get("user-agent")?.slice(0, 200) || undefined,
    ip: req.headers.get("x-forwarded-for")?.split(",")[0].trim() || undefined,
  };

  try {
    await ensureLog();
    await appendFile(LOG_PATH, JSON.stringify(entry) + "\n", { encoding: "utf8" });
  } catch {
    // Never fail the client on logging problems
  }

  return NextResponse.json({ ok: true });
}