{ config, pkgs, lib, ... }:
with import ../../lib/pure.nix { inherit lib; }; {

  options.krebs.reaktor2 = mkOption {
    default = {};
    type = types.attrsOf (types.submodule (self: let
      name = self.config._module.args.name;
    in {
      options = {
        nick = mkOption {
          default = name;
          # TODO types.irc.nickname
          type = types.str;
        };
        hostname = mkOption {
          default = "irc.r";
          type = types.hostname;
        };
        port = mkOption {
          default = "6667";
          type = types.str;
        };
        plugins = mkOption {
          default = [];
          type = types.listOf types.attrs;
        };
        stateDir = mkOption {
          default = "/var/lib/${self.config.username}";
          defaultText = "/var/lib/‹username›";
          readOnly = true;
          type = types.absolute-pathname;
        };
        systemd-service-name = mkOption {
          default = "reaktor2${optionalString (name != "default") "-${name}"}";
          defaultText = "reaktor2-‹name› or just reaktor2 if ‹name› is \"default\"";
          type = types.filename;
        };
        sendDelaySec = mkOption {
          default = 0.7;
          type = types.nullOr types.float;
        };
        username = mkOption {
          default = self.config.systemd-service-name;
          defaultText = "‹systemd-service-name›";
          type = types.username;
        };
        useTLS = mkOption {
          default = self.config.port == "6697";
          type = types.bool;
        };
        API.listen = mkOption {
          default = null;
          type = types.nullOr types.str;
        };
      };
    }));
  };

  config = {
    systemd.services = flip mapAttrs' config.krebs.reaktor2 (_: cfg:
      nameValuePair cfg.systemd-service-name {
        after = [ "network.target" ];
        environment = {
          LC_ALL = "en_US.UTF-8";
        };
        wantedBy = [ "multi-user.target" ];
        serviceConfig = {
          User = cfg.username;
          Group = "reaktor2";
          DynamicUser = true;
          StateDirectory = cfg.username;
          ExecStart = let
            configFile = pkgs.writers.writeJSON configFileName configValue;
            configFileName = "${cfg.systemd-service-name}.config.json";
            configValue = stripAttr (
              recursiveUpdate {
                logTime = false;
              } (removeAttrs cfg ["_module"])
            );
          in "${pkgs.reaktor2}/bin/reaktor ${configFile}";
          Restart = "always";
          RestartSec = "30";
        };
      }
    );
  };
}