module.nix

{ config, lib, pkgs, ... }:
with lib;
let
  cfg = config.services.service-name;
  environment = {
    REQUIRE_SSL = cfg.REQUIRE_SSL;
  };
in {
  ###### interface
  options = {
    services.service-name = rec {
      enable = mkEnableOption "service-name-service";
      package = mkOption {
        type = types.path;
        description = "The service-name package.";
      };
      gems = mkOption {
        type = types.path;
        description = "The service-name-gems package.";
      };
      REQUIRE_SSL = mkOption {
        type = types.bool;
        description = "Whether or not to redirect to SSL";
      };
    };
  };

  ###### implementation
  config = mkIf cfg.enable {
    systemd.services = {
      service-name = {
        wantedBy = [ "multi-user.target" ];
        bindsTo = [ "service-name-init.service" ];
        after = [ "service-name-init.service" ];
        inherit environment;
        serviceConfig = {
          ExecStart = "${cfg.package}/bin/service-name";
          User = "mercury";
          Group = "mercury";
          Restart = "always";
          WorkingDirectory = cfg.package;
        };
      };
    };
  };
}