{ config, pkgs, ... }:

with pkgs.lib;

let

  bitlbeeUid = config.ids.uids.bitlbee;

  inherit (config.services.bitlbee) portNumber interface;

in

{

  ###### interface

  options = {

    services.bitlbee = {

      enable = mkOption {
	default = false;
	description = ''
	  Whether to run the BitlBee IRC to other chat network gateway.
	  Running it allows you to access the MSN, Jabber, Yahoo! and ICQ chat
	  networks via an IRC client.
	'';
      };

      interface = mkOption {
	default = "127.0.0.1";
	description = ''
	  The interface the BitlBee deamon 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 = 6667;
	description = ''
	  Number of the port BitlBee will be listening to.
	'';
      };

    };

  };


  ###### implementation

  config = mkIf config.services.bitlbee.enable {

    users.extraUsers = singleton
      { name = "bitlbee";
	uid = bitlbeeUid;
	description = "BitlBee user";
	home = "/var/empty";
      };

    users.extraGroups = singleton
      { name = "bitlbee";
	gid = config.ids.gids.bitlbee;
      };

    jobs.bitlbee =
      { description = "BitlBee IRC to other chat networks gateway";
	name = "bitlbee";

	startOn = "ip-up";

	preStart =
	  ''
	    if ! test -d /var/lib/bitlbee
	    then
		mkdir -p /var/lib/bitlbee
		chown bitlbee:bitlbee /var/lib/bitlbee
	    fi
	  '';

	exec =
	  ''
	    ${pkgs.bitlbee}/sbin/bitlbee -F -p ${toString portNumber} \
	      -i ${interface} -u bitlbee
	  '';
      };

    environment.systemPackages = [ pkgs.bitlbee ];

  };

}