{ config, pkgs, ... }:

let
  shell = "${pkgs.dash}/bin/dash";

  default_master_ratio = "0.6";
  up_layout = "Up ((h: v v) 1 ${default_master_ratio} 0)";
  down_layout = "Down ((h: v v) 1 ${default_master_ratio} 1)";
  left_layout = "Left ((v: h h) 1 ${default_master_ratio} 0)";
  right_layout = "Right ((v: h h) 1 ${default_master_ratio} 1)";
  deck_layout = "Deck deck";
  full_layout = "Full full";
  wide_layout = "Wide ((v: h h h) 1 0.5 1)";
  column_layout = "Cols (v: v)";
  default_layout = left_layout;

  riverctl = "${pkgs.river}/bin/riverctl";
  kile = "${pkgs.kile-wl}/bin/kile";
  kile_namespace = "kile";

in {

  home.packages = with pkgs; [ kile-wl ];

  systemd.user.services.kile-wl = {
    Unit = {
      Description = "kile layout generator";
      BindsTo = [ "river-session.target" ];
    };
    Service = {
      Type = "simple";
      ExecStart =
        "${kile} --namespace ${kile_namespace}";
    };
    Install = { WantedBy = [ "river-session.target" ]; };
  };

  xdg.dataFile = {
    layout = {
      target = "${config.xdg.configHome}/river/layout.kl";
      source = ./layout.kl;
    };
    init-kile = {
      executable = true;
      target = "${config.xdg.configHome}/river/init-kile";
      text = ''
        #!${shell}

        # Super+H and Super+L to decrease/increase the main ratio
        ${riverctl} map -repeat normal Super Equal send-layout-cmd ${kile_namespace} "mod_main_ratio +0.01"
        ${riverctl} map -repeat normal Super Minus send-layout-cmd ${kile_namespace} "mod_main_ratio -0.01"

        # Super+Comma and Super+Period. to increment/decrement the main count
        ${riverctl} map normal Super Comma  send-layout-cmd ${kile_namespace} "mod_main_amount +1"
        ${riverctl} map normal Super Period send-layout-cmd ${kile_namespace} "mod_main_amount -1"

        # Super+{Up,Right,Down,Left} to change layout orientation
        ${riverctl} map normal Super+Control K send-layout-cmd ${kile_namespace} "focused ${up_layout}"
        ${riverctl} map normal Super+Control J send-layout-cmd ${kile_namespace} "focused ${down_layout}"
        ${riverctl} map normal Super+Control H send-layout-cmd ${kile_namespace} "focused ${left_layout}"
        ${riverctl} map normal Super+Control L send-layout-cmd ${kile_namespace} "focused ${right_layout}"
        ${riverctl} map normal Super+Control D send-layout-cmd ${kile_namespace} "focused ${deck_layout}"
        ${riverctl} map normal Super+Control F send-layout-cmd ${kile_namespace} "focused ${full_layout}"
        ${riverctl} map normal Super+Control W send-layout-cmd ${kile_namespace} "focused ${wide_layout}"
        ${riverctl} map normal Super+Control C send-layout-cmd ${kile_namespace} "focused ${column_layout}"
        ${riverctl} map normal Super+Shift Space send-layout-cmd ${kile_namespace} "focused ${default_layout}"

        ${riverctl} default-layout ${kile_namespace}
      '';
    };
  };
}