import dotenv from "dotenv";
import { NextFunction, Request, Response } from "express";
import { resolve } from "path";
import { logger } from "../server.js";

dotenv.config({
  path: resolve(process.cwd(), `.env.${process.env.NODE_ENV || "development"}`)
});

export default function ValidateImsToken(req: Request, res: Response, next: NextFunction) {
  try {
    const IMS_TOKEN: string = (process.env.IMS_TOKEN || "").trim();

    if (!IMS_TOKEN) {
      logger.debug("IMS_TOKEN not set, skipping token validation.");
      next();
      return;
    }

    const token = req.headers.ims_token || req.headers["ims-token"] || req.headers["x-ims-token"];
    if (token !== IMS_TOKEN) {
      logger.warning("Invalid IMS token provided.", { provided: token });
      res.sendStatus(401);
      return;
    }

    next();
  } catch (error) {
    logger.error("Error validating IMS token.", { error: (error as Error).message });
    if (!res.headersSent) res.sendStatus(401);
  }
}