{
  config,
  lib,
  ...
}:

with lib;
let
  generateOption = name: value:
    if isBool value
    then "OPTIONS=${if value then "" else "!"}${name}"
    else "OPTIONS=${name}:${toString value}";

  generateHilite = field: settings:
    let createHiliteString = trigger: color: "/${trigger}/${color}";
        hilite_strings = mapAttrsToList combine settings;
    in "OPTIONS=hilite_status:${field}${concatStrings hilite_strings}";

  generateMsgType = action: messages:
    let createMsgTypeString = message: ''MSGTYPE=${action} "${message}"'';
        msg_type_strings = map createMsgTypeString messages;
    in concatStringsSep "\n" msg_type_strings;

  generateMenuColor = regex: color: ''MENUCOLOR="${regex}"=${color}'';

  generateNehackrc = nethack_config:
    let all_configs = (mapAttrsToList generateOption nethack_config.options)
                   ++ (mapAttrsToList generateHilite nethack_config.hilite_status)
                   ++ (mapAttrsToList generateMsgType nethack_config.msg_types)
                   ++ (mapAttrsToList generateMenuColor nethack_config.menu_colors);
    in concatStringsSep "\n" all_configs;
in
{
  options.programs.nethack = with types; {
    enable = mkEnableOption "nethack configuration";

    options = mkOption {
      type = attrsOf (oneOf [bool int str]);
      default = {};
      description = "Nethack options";
      example = literalExpression ''
        {
          boulder = "0";
          windowtype = "curses";
          statuslines = 3;
          autopickup = true;
        }
      '';
    }

    hilite_status = mkOption {
      type = attrsOf (attrsOf str);
      default = {};
      description = "Status hilites options set";
      example = literalExpression ''
        {
          hitpoints = {
            "100%" = "grey&normal";
            "<100%" = "green&normal";
            "<66%" = "yellow&normal";
            "<50%" = "orange&normal";
            "<33%" = "red&bold";
          };

          gold.up = "yellow";
          gold.down = "brown";
        }
      '';
    };

    menu_colors = mkOption {
      type = attrsOf str;
      default = {};
      description = "Set of MENUCOLOR= options";
    };

    msg_types = mkOption {
      type = attrsOf (listOf str);
      default = {};
      description = "Set of MSGTYPE= options";
      example = literalExpression ''
        {
          hide = [
            "You swap places with .*"
            "Your tentacles suck the .*"
          ];

          norep = [
            "You see here a.*"
          ];
        }
      '';
    };
  };

  config = {
    home.file.".nethackrc" = with config.programs.nethack; {
      inherit enable;
      text = generateNehackrc config.programs.nethack;
    };
  };
}
# vim: et ts=2 sw=2