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{ config, lib, pkgs, ... }:

with lib;

let
  quassel = pkgs.kde4.quasselDaemon;
  cfg = config.services.quassel;
  user = if cfg.user != null then cfg.user else "quassel";
in

{

  ###### interface

  options = {

    services.quassel = {

      enable = mkOption {
        default = false;
        description = ''
          Whether to run the Quassel IRC client daemon.
        '';
      };

      interface = mkOption {
        default = "127.0.0.1";
        description = ''
          The interface the Quassel daemon will be listening to.  If `127.0.0.1',
          only clients on the local host can connect to it; if `0.0.0.0', clients
          can access it from any network interface.
        '';
      };

      portNumber = mkOption {
        default = 4242;
        description = ''
          The port number the Quassel daemon will be listening to.
        '';
      };

      dataDir = mkOption {
        default = ''/home/${user}/.config/quassel-irc.org'';
        description = ''
          The directory holding configuration files, the SQlite database and the SSL Cert.
        '';
      };

      user = mkOption {
        default = null;
        description = ''
          The existing user the Quassel daemon should run as. If left empty, a default "quassel" user will be created.
        '';
      };

    };

  };


  ###### implementation

  config = mkIf cfg.enable {

    users.extraUsers = mkIf (cfg.user == null) [
      { name = "quassel";
        description = "Quassel IRC client daemon";
        group = "quassel";
        uid = config.ids.uids.quassel;
      }];

    users.extraGroups = mkIf (cfg.user == null) [
      { name = "quassel";
        gid = config.ids.gids.quassel;
      }];

    jobs.quassel =
      { description = "Quassel IRC client daemon";

        startOn = "ip-up";

        preStart = ''
            mkdir -p ${cfg.dataDir}
            chown ${user} ${cfg.dataDir}
        '';

        exec = ''
            ${pkgs.su}/bin/su -s ${pkgs.stdenv.shell} ${user} \
                -c '${quassel}/bin/quasselcore --listen=${cfg.interface}\
                    --port=${toString cfg.portNumber} --configdir=${cfg.dataDir}'
        '';
      };

  };

}