{ lib, config, pkgs, mmdvm_host, ... }:
with lib;
let
  # Shorter name to access final settings a 
  # user of hello.nix module HAS ACTUALLY SET.
  # cfg is a typical convention.
  cfg = config.services.mmdvm_host;
in
{

  options.services.mmdvm_host = {
    enable = mkEnableOption "MMDVMHost service";
    package = mkOption {
      default = mmdvm_host.x86_64-linux.default;
      type = types.package;
    };
    user = mkOption {
      type = types.str;
      default = "afg";
    };
  };


  config = mkIf cfg.enable {
    # List packages installed in system profile. To search, run:
    # $ nix search wget
    environment.systemPackages = [
      cfg.package
    ];

    systemd.services.mmdvm_host = {
      wantedBy = [ "multi-user.target" ];
      wants = [ "network.target" ];
      after = [ "network.target" ];
      description = "MMDVMHost service";
      serviceConfig = {
        Type = "exec";
        User = cfg.user;
        Restart = "always";
        RestartSec = "3s";
        StartLimitIntervalSec = "0";
        RuntimeDirectory = "MMDVMHost";
      };
      script = ''
        exec ${cfg.package}/bin/MMDVMHost
      '';
    };
  };

}