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

  unstable = import <nixpkgs-unstable> { };

  activeTasks = pkgs.writers.writeBash "active-tasks" ''
    ${pkgs.taskwarrior}/bin/task export +checklist status:pending +READY | \
    ${pkgs.jq}/bin/jq  \
      --raw-output '
      sort_by(.description) | reverse |
      .[] |
      "[ \( .id ) ] \( .description )"
    '
    echo
    ${pkgs.taskwarrior}/bin/task export  \
    +ACTIVE status:pending \
    | ${pkgs.jq}/bin/jq --raw-output '.[] | "⇒ \(.id) \(.description)"'
  '';

  userHighlight = map ({ user, ... }: user)
    (builtins.attrValues config.programs.custom.browser.configList);

  activeUsers = pkgs.writers.writeBash "active-users" ''
    ${pkgs.procps}/bin/ps -eo user \
     | ${pkgs.gnused}/bin/sed '1 d' \
     | ${pkgs.coreutils}/bin/sort  \
     | ${pkgs.coreutils}/bin/uniq \
     | ${pkgs.gnugrep}/bin/egrep --color=always '(${
       pkgs.lib.concatStringsSep "|" userHighlight
     })|$'
  '';

  qJson = {
    wtf = {

      term = "rxvt-unicode-256color";

      colors.border = {
        focusable = "darkslateblue";
        focused = "orange";
        normal = "green";
      };

      grid = {
        columns = [ 33 40 36 0 ];
        rows = [ 9 3 7 6 0 ];
      };

      refreshInterval = 1;

      mods = {

        digitalclock = {
          title = "";
          type = "digitalclock";
          enabled = true;
          color = "white";
          font = "bigfont";
          hourFormat = 24;
          refreshInterval = 1;
          position.top = 0;
          position.left = 0;
          position.height = 1;
          position.width = 1;
        };
        clocks = {
          title = "";
          type = "clocks";
          enabled = true;
          border = false;
          colors.rows = {
            even = "white";
            odd = "white";
          };
          locations = {
            Berlin = "Europe/Berlin";
            Wellington = "Pacific/Auckland";
          };
          sort = "alphabetical";
          position.top = 1;
          position.left = 0;
          position.height = 1;
          position.width = 1;
          refreshInterval = 60;
        };

        resourceusage = {
          title = "";
          cpuCombined = false;
          enabled = true;
          position.top = 0;
          position.left = 1;
          position.height = 1;
          position.width = 1;
          refreshInterval = 5;
        };

        power = {
          enabled = true;
          position.top = 2;
          position.left = 0;
          position.height = 1;
          position.width = 1;
          refreshInterval = 100;
          title = "Power";
        };

        rates = {
          type = "exchangerates";
          title = "rates";
          enabled = true;
          focusable = false;
          position.top = 3;
          position.left = 0;
          position.height = 1;
          position.width = 1;
          rates.NZD = [ "EUR" ];
          rates.EUR = [ "NZD" ];
        };

        prettyweather = {
          enabled = true;
          title = "";
          city = "Wellington";
          position.top = 0;
          position.left = 2;
          position.height = 1;
          position.width = 1;
          unit = "m";
          view = 0;
          language = "en";
          refreshInterval = 3600;
        };

        calendar = {
          type = "cmdrunner";
          title = "";
          focusable = false;
          args = [ "-3" "--monday" "--color=never" "-w" ];
          cmd = "cal";
          enabled = true;
          position.top = 1;
          position.left = 1;
          position.height = 2;
          position.width = 2;
          refreshInterval = 3600;
        };

        uptime = {
          type = "cmdrunner";
          title = "uptime";
          focusable = false;
          cmd = "uptime";
          enabled = true;
          position.top = 3;
          position.left = 1;
          position.height = 1;
          position.width = 2;
          refreshInterval = 300;
        };

        active-users = {
          type = "cmdrunner";
          title = "users";
          focusable = false;
          cmd = activeUsers;
          enabled = true;
          position.top = 0;
          position.left = 3;
          position.height = 4;
          position.width = 1;
          refreshInterval = 30;
        };

        active-tasks = {
          type = "cmdrunner";
          title = "active tasks";
          focusable = false;
          cmd = activeTasks;
          enabled = true;
          position.top = 4;
          position.left = 0;
          position.height = 1;
          position.width = 4;
          refreshInterval = 60;
        };
      };
    };
  };

  qConfig = pkgs.writeText "config.yml" (builtins.toJSON qJson);

  q = pkgs.writers.writeBashBin "q" ''
    ${unstable.wtf}/bin/wtfutil --config=${toString qConfig}
  '';
in {

  services.upower.enable = true;

  environment.systemPackages = [
    unstable.wtf
    q
    #activeUsers
    #activeTasks
    pkgs.upower
  ];

}