import type { Request, Response, NextFunction } from "express";
import { createRequestId, logInfo } from "../utils/logger.js";

export function accessLogMiddleware(
  req: Request,
  res: Response,
  next: NextFunction
): void {
  const startedAt = Date.now();
  const requestId = resolveRequestId(req);

  req.requestId = requestId;
  res.setHeader("X-Request-Id", requestId);

  res.on("finish", () => {
    if (shouldSkipAccessLog(req.originalUrl, res.statusCode)) {
      return;
    }

    logInfo("[http/access]", "request completed", {
      requestId,
      method: req.method,
      originalUrl: req.originalUrl,
      statusCode: res.statusCode,
      durationMs: Date.now() - startedAt,
      ip: req.ip,
      forwardedFor: String(req.headers["x-forwarded-for"] || ""),
      userAgent: String(req.headers["user-agent"] || ""),
      referer: String(req.headers.referer || ""),
      contentLength: Number(res.getHeader("content-length") || 0),
      actorUserId: req.adminSession?.userId || "",
      actorUsername: req.adminSession?.username || "",
      actorRole: req.adminSession?.role || "",
    });
  });

  next();
}

function resolveRequestId(req: Request): string {
  const fromHeader = String(req.headers["x-request-id"] || "").trim();
  return fromHeader || createRequestId("req");
}

function shouldSkipAccessLog(originalUrl: string, statusCode: number): boolean {
  const pathname = String(originalUrl || "").split("?")[0] || "";
  return (
    ["/health", "/health/live", "/health/ready"].includes(pathname) &&
    Number(statusCode) < 400
  );
}