/**
 * Lightweight HTTP request logger that records method, url, status and duration
 * for every incoming request. Skips noisy probe endpoints to keep logs clean.
 */
import type { Request, Response, NextFunction } from "express";
import { childLogger } from "./logger.js";

const httpLog = childLogger("http");

const SKIP_PATHS = new Set(["/api/live", "/api/ready", "/api/health"]);

export function requestLogger(req: Request, res: Response, next: NextFunction): void {
  if (SKIP_PATHS.has(req.path)) return next();

  const startNs = process.hrtime.bigint();

  res.on("finish", () => {
    const durationMs = Number((process.hrtime.bigint() - startNs) / 1_000_000n);
    const status = res.statusCode;
    const payload = {
      method: req.method,
      url: req.originalUrl ?? req.url,
      status,
      durationMs,
    };
    if (status >= 500) httpLog.error(payload, "request failed");
    else if (status >= 400) httpLog.warn(payload, "request error");
    else httpLog.info(payload, "request ok");
  });

  next();
}