module.nix

{
  pkgs,
  config,
  lib,
  ...
}:
let
  service_name = "fauxmo";
  cfg = config.services.${service_name};
in
with lib;
{
  options.services.${service_name} = {
    enable = mkEnableOption service_name;
    user = mkOption {
      type = types.str;
      description = "User that fauxmo will run as";
      default = "fauxmo";
    };
    configFile = mkOption {
      type = types.str;
      description = "Path to config.json";
    };
    verbosity = mkOption {
      type = types.enum [
        0
        1
        2
        3
      ];
      default = 0;
    };

    openFirewall = mkOption {
      type = types.bool;
      default = false;
      description = lib.mdDoc "Whether to open TCP ports in the firewall";
    };
    tcpPortRange = mkOption {
      description = "TCP range to open for fauxmo";
      type =
        with types;
        submodule {
          options = {
            from = mkOption {
              type = int;
            };
            to = mkOption {
              type = int;
            };
          };
        };
    };
  };

  config = mkIf cfg.enable {
    networking.firewall = mkIf cfg.openFirewall {
      allowedUDPPorts = [
        1900
      ];
      allowedTCPPortRanges = [
        {
          inherit (cfg.tcpPortRange) to from;
        }
      ];
    };
    systemd.services.${service_name} =
      let
        pythonWithFauxmo = pkgs.python3.withPackages (
          ps: with ps; [
            fauxmo
            uvloop
          ]
        );
        after = [ "network-online.target" ];
      in
      {
        description = service_name;
        inherit after;
        requires = after;
        script =
          let
            verbosity =
              if cfg.verbosity == 0 then
                ""
              else
                "-" + lib.concatStrings (builtins.genList (_: "v") cfg.verbosity);
          in
          ''${pythonWithFauxmo}/bin/python -m fauxmo.cli ${verbosity} -c "${cfg.configFile}"'';
        serviceConfig = {
          User = cfg.user;
          Restart = "on-failure";
          RestartSec = 30;
        };
        wantedBy = [ "multi-user.target" ];
      };
    users = mkIf (cfg.user == "fauxmo") {
      users = {
        fauxmo = {
          isSystemUser = true;
          group = "fauxmo";
        };
      };
      groups.fauxmo = { };
    };
  };
}