import { Request, Response, NextFunction } from "express";
import { v4 as uuidv4 } from "uuid";
import { logger } from "../config/logger";

const SKIP_PATHS = ["/api/health", "/uploads"];

export function requestLogger(req: Request, res: Response, next: NextFunction) {
  const requestId =
    (req.headers["x-request-id"] as string) || uuidv4();
  req.headers["x-request-id"] = requestId;
  res.setHeader("X-Request-Id", requestId);

  if (SKIP_PATHS.some((p) => req.path.startsWith(p))) {
    return next();
  }

  const start = Date.now();

  res.on("finish", () => {
    const duration = Date.now() - start;
    const meta = {
      method: req.method,
      url: req.originalUrl,
      status: res.statusCode,
      duration: `${duration}ms`,
      requestId,
      ip: req.ip || req.socket.remoteAddress,
    };

    if (res.statusCode >= 500) {
      logger.error(`${req.method} ${req.originalUrl} ${res.statusCode}`, meta);
    } else if (res.statusCode >= 400) {
      logger.warn(`${req.method} ${req.originalUrl} ${res.statusCode}`, meta);
    } else {
      logger.info(`${req.method} ${req.originalUrl} ${res.statusCode}`, meta);
    }
  });

  next();
}