{
  options,
  config,
  lib,
  pkgs,
  ...
}:
with lib; let
  cfg = config.aa.services.prometheus;
in {
  options.aa.services.prometheus = with types; {
    enable = mkEnableOption "prometheus";
    acmeCertName = mkOption {
      type = str;
      default = "";
      description = ''
        If set to a non-empty string, forces SSL with the supplied acme
        certificate.
      '';
    };
  };

  config = mkIf cfg.enable {
    services.prometheus.enable = true;

    services.nginx = {
      enable = true;
      virtualHosts."prometheus.${cfg.acmeCertName}" =
        {
          locations."/" = {
            proxyPass = "http://${config.services.prometheus.listenAddress}:${toString config.services.prometheus.port}";
          };
        }
        // lib.optionalAttrs (cfg.acmeCertName != "") {
          forceSSL = true;
          useACMEHost = cfg.acmeCertName;
        };
    };

    networking.firewall = {
      allowedTCPPorts = [80 443];
    };
  };
}