import { RequestHandler } from "express";
import promBundle from "express-prom-bundle";
import { config } from "../utils/config";
import constants from "../utils/constants";

export const metricsMiddleware: RequestHandler = promBundle({
  includeStatusCode: true,
  includeMethod: true,
  includePath: true,

  bypass: (req) => req.path === "/health",

  autoregister: false,

  // histogram buckets in ms
  buckets:
    config.INVENTORY === "internal"
      ? constants.INTERNAL_PROMETHEUS_BUCKETS_MS.map((b) => b / 1000)
      : constants.EXTERNAL_PROMETHEUS_BUCKETS_MS.map((b) => b / 1000),
});