{ lib, pkgs, config, ...}: let
  inherit (lib) mkIf mkEnableOption mkOption types optionals optionalAttrs;
  cfg = config.chuj.stuff.i3;
  user = config.chuj.system.user;
in {
  options.chuj.stuff.i3 = {
    enable = mkEnableOption "i3";
    workspaceOutput = mkOption {
      type = types.attrsOf types.str;
      default = {};
    };
    communicators = mkOption {
      type = types.submodule {
        options = {
          autostart = mkOption {
            type = types.bool;
            default = false;
          };
          workspace = mkOption {
            type = types.str;
            default = "";
          };
        };
      };
      default = {};
    };
    battery = mkEnableOption "battery";
    mediaKeys = mkOption {
      type = types.submodule {
        options = let
          mkKeyOpt = default: mkOption { inherit default; type = types.str; };
        in {
          musicMenu = mkKeyOpt "F5";
          musicPlay = mkKeyOpt "F7";
          musicPrev = mkKeyOpt "F6";
          musicNext = mkKeyOpt "F8";
          audioMute = mkKeyOpt "F9";
          audioDown = mkKeyOpt "F10";
          audioUp = mkKeyOpt "F11";
        };
      };
      default = {};
    };
  };

  config = let
    hmCfg = config.home-manager.users.${user};

    exec = what: "exec --no-startup-id ${what}";

    i3-msg = lib.getExe' hmCfg.xsession.windowManager.i3.package "i3-msg";
    terminal = if (config.chuj.stuff.alacritty.enable)
      then (lib.getExe  hmCfg.programs.alacritty.package)
      else (lib.getExe' hmCfg.xsession.windowManager.i3.package "i3-sensible-terminal");
    firefox = lib.getExe hmCfg.programs.firefox.package;
    schildichat = lib.getExe pkgs.schildichat-desktop;
    flameshot = lib.getExe hmCfg.services.flameshot.package;
    dunst = lib.getExe' hmCfg.services.dunst.package "dunst";
    dunstify = lib.getExe' hmCfg.services.dunst.package "dunstify";
    dmenu_run = lib.getExe' pkgs.dmenu "dmenu_run";
    dmenu = lib.getExe pkgs.dmenu;
    yad = lib.getExe pkgs.yad;
    mpc = lib.getExe pkgs.mpc-cli;
    mpdstatus = lib.getExe config.chuj.stuff.mpd.mpdstatusPackage;
    pamixer = lib.getExe pkgs.pamixer;
    xdotool = lib.getExe pkgs.xdotool;
    xkill = lib.getExe pkgs.xorg.xkill;
    killall = lib.getExe pkgs.killall;
    sync = lib.getExe' pkgs.coreutils "sync";
    tail = lib.getExe' pkgs.coreutils "tail";
    find = lib.getExe' pkgs.findutils "find";
    sed = lib.getExe pkgs.gnused;

    i3custom-window-actions = lib.getExe (pkgs.writeShellScriptBin "i3custom-window-actions" ''
      ${yad} --splash --mouse                \
          --title="i3 window actions"        \
          --gtkrc="${../../files/i3gtk.css}" \
          --text="i3 window actions"         \
          --button float:0 --button kill:1

      case $? in
        0) ${i3-msg} "floating toggle";;
        1) ${i3-msg} "kill";;
       -1) ;;
      esac
    '');

    musicsel = lib.getExe (pkgs.writeShellScriptBin "musicsel" ''
      cd ~/Music
      path=$(${find} . -maxdepth 1 -type d | ${tail} -n +2 | ${sed} 's|^./||g' | ${dmenu})
      ${dunstify} "playing from \"$path\""
      ${mpc} update
      ${mpc} rescan
      ${mpc} add "$path"
      ${mpc} random on
      ${mpc} repeat on
      ${mpc} play
    '');

    i3custom-center-mouse-on-focus = lib.getExe (pkgs.writeShellScriptBin "i3custom-center-mouse-on-focus" ''
      eval $(${xdotool} getwindowfocus getwindowgeometry --shell)
      MX=$(($X + $WIDTH / 2))
      MY=$(($Y + $HEIGHT / 2))
      ${xdotool} mousemove $MX $MY
    '');
  in mkIf cfg.enable {
    services.xserver.windowManager.i3.enable = true;
    home-manager.users.${user} = {
      xsession.windowManager.i3 = {
        enable = true;
        config = rec {
          assigns = mkIf (cfg.communicators.workspace != "") {
            ${cfg.communicators.workspace} = [
              { class = "discord"; }
              { class = "SchildiChat"; }
              { class = "element"; }
            ];
          };

          window = {
            border = 1;
            titlebar = true;
          };

          floating = {
            border = 1;
            titlebar = true;
            criteria = [
              { class = "zenity"; }
              { class = "fceux"; }
              { title = "Friends List"; } # steam
            ];
          };

          gaps = {
            inner = 0;
            outer = 0;
          };

          fonts = {
            names = [ "monospace" ];
            size = 10.0;
          };

          defaultWorkspace = "workspace number 1";

          # transforms
          # { "<workspace>" = "<output>"; }
          # into
          # [{ workspace = "<workspace>"; output = "<output>"; }]
          workspaceOutputAssign = lib.mapAttrsToList
            (workspace: output: { inherit workspace output; })
          cfg.workspaceOutput;

          focus = {
            followMouse = true;
            mouseWarping = true;
            newWindow = "urgent";
          };

          startup = []
          ++ optionals config.chuj.stuff.dunst.enable     [{ command = "${dunst}       &"; notification = false; }]
          ++ optionals config.chuj.stuff.flameshot.enable [{ command = "${flameshot}   &"; notification = false; }]
          ++ optionals cfg.communicators.autostart        [{ command = "${schildichat} &"; notification = false; }]
          ++ optionals config.chuj.stuff.mpd.enable       [{ command = "${mpdstatus}   &"; notification = false; }];

          modes = {
            resize = {
              "Left"   = "resize shrink width  10 px or 10 ppt; ${exec i3custom-center-mouse-on-focus}";
              "Right"  = "resize grow   width  10 px or 10 ppt; ${exec i3custom-center-mouse-on-focus}";
              "Up"     = "resize shrink height 10 px or 10 ppt; ${exec i3custom-center-mouse-on-focus}";
              "Down"   = "resize grow   height 10 px or 10 ppt; ${exec i3custom-center-mouse-on-focus}";
              "Escape" = "mode default";
            };
          };

          modifier = "Mod4";
          floating.modifier = "Mod4";

          keybindings = with config.chuj.stuff.i3.mediaKeys; let
            mod = modifier;
            update_mpdstatus = "${killall} -USR1 mpdstatus && ${sync} ${config.chuj.stuff.mpd.statusFile}";
            update_i3status  = "${killall} -USR1 i3status";
            center_mouse = exec i3custom-center-mouse-on-focus;
          in {
            # Program keybinds
            "${mod}+Return"  = exec terminal;
            "${mod}+d"       = exec dmenu_run;
            "${mod}+Shift+s" = mkIf config.chuj.stuff.flameshot.enable (exec "${flameshot} gui");
            "${mod}+b"       = mkIf config.chuj.stuff.firefox.enable (exec firefox);
            "--release ${mod}+k" = exec xkill;

            # Volume control
            "Ctrl+${audioMute}" = exec "${pamixer} --toggle-mute && ${update_i3status}";
            "Ctrl+${audioDown}" = exec "${pamixer} --decrease 5  && ${update_i3status}";
            "Ctrl+${audioUp}"   = exec "${pamixer} --increase 5  && ${update_i3status}";

            # General i3 keybindings
            "${mod}+Shift+q" = "kill;              ${center_mouse}";
            "${mod}+f"       = "fullscreen toggle; ${center_mouse}";
            "${mod}+r"       = "mode resize";
            "${mod}+Shift+r" = "restart";
            "--border button3" = exec i3custom-window-actions;

            "${mod}+Left"        = "focus left;  ${center_mouse}";
            "${mod}+Right"       = "focus right; ${center_mouse}";
            "${mod}+Up"          = "focus up;    ${center_mouse}";
            "${mod}+Down"        = "focus down;  ${center_mouse}";
            "${mod}+Shift+Left"  = "move left;   ${center_mouse}";
            "${mod}+Shift+Right" = "move right;  ${center_mouse}";
            "${mod}+Shift+Up"    = "move up;     ${center_mouse}";
            "${mod}+Shift+Down"  = "move down;   ${center_mouse}";

            "${mod}+q" = "layout stacking;     ${center_mouse}";
            "${mod}+w" = "layout tabbed;       ${center_mouse}";
            "${mod}+e" = "layout toggle split; ${center_mouse}";

            "${mod}+Shift+space" = "floating toggle;   ${center_mouse}";
            "${mod}+space"       = "focus mode_toggle; ${center_mouse}";

            "${mod}+1" = "workspace number 1;  ${center_mouse}";
            "${mod}+2" = "workspace number 2;  ${center_mouse}";
            "${mod}+3" = "workspace number 3;  ${center_mouse}";
            "${mod}+4" = "workspace number 4;  ${center_mouse}";
            "${mod}+5" = "workspace number 5;  ${center_mouse}";
            "${mod}+6" = "workspace number 6;  ${center_mouse}";
            "${mod}+7" = "workspace number 7;  ${center_mouse}";
            "${mod}+8" = "workspace number 8;  ${center_mouse}";
            "${mod}+9" = "workspace number 9;  ${center_mouse}";
            "${mod}+0" = "workspace number 10; ${center_mouse}";

            "${mod}+Shift+1" = "move container to workspace number 1;  ${center_mouse}";
            "${mod}+Shift+2" = "move container to workspace number 2;  ${center_mouse}";
            "${mod}+Shift+3" = "move container to workspace number 3;  ${center_mouse}";
            "${mod}+Shift+4" = "move container to workspace number 4;  ${center_mouse}";
            "${mod}+Shift+5" = "move container to workspace number 5;  ${center_mouse}";
            "${mod}+Shift+6" = "move container to workspace number 6;  ${center_mouse}";
            "${mod}+Shift+7" = "move container to workspace number 7;  ${center_mouse}";
            "${mod}+Shift+8" = "move container to workspace number 8;  ${center_mouse}";
            "${mod}+Shift+9" = "move container to workspace number 9;  ${center_mouse}";
            "${mod}+Shift+0" = "move container to workspace number 10; ${center_mouse}";
          } // (optionalAttrs config.chuj.stuff.mpd.enable {
            # MPD controls
            "Ctrl+${musicMenu}"       = exec  "${musicsel} && ${update_mpdstatus} && ${update_i3status}";
            "Ctrl+${musicPrev}"       = exec  "${mpc} prev && ${update_mpdstatus} && ${update_i3status}";
            "Ctrl+${musicNext}"       = exec  "${mpc} next && ${update_mpdstatus} && ${update_i3status}";
            "Ctrl+${musicPlay}"       = exec  "${mpc} toggle && ${update_mpdstatus} && ${update_i3status}";
            "Ctrl+Shift+${musicPlay}" = exec  "${mpc} clear  && ${update_mpdstatus} && ${update_i3status}";
            "Ctrl+Shift+${musicPrev}" = exec  "${mpc} seek -3";
            "Ctrl+Shift+${musicNext}" = exec  "${mpc} seek +3";
            "Ctrl+Shift+${audioDown}" = exec ''${mpc} volume -5 && ${dunstify} "mpc $(${mpc} volume)" -r 420'';
            "Ctrl+Shift+${audioUp}"   = exec ''${mpc} volume +5 && ${dunstify} "mpc $(${mpc} volume)" -r 420'';
          });

          bars = [{
            inherit fonts;
            trayOutput = "primary";
            statusCommand = "${lib.getExe hmCfg.programs.i3status.package}";
            extraConfig = ''
              height 24
            '';
          }];
        };
      };

      programs.i3status = {
        enable = true;
        enableDefault = false;

        general = {
          interval = 1;
          colors = true;
          color_good = "#91d956";
          color_bad = "#f43841";
          color_degraded = "#ffdd33";
          output_format = "i3bar";
        };

        modules = {
          "cpu_usage" = {
            position = 0;
            settings = {
              format = "cpu: %usage";
            };
          };
          "memory" = {
            position = 1;
            settings = {
              format = "mem: %used";
              threshold_degraded = "1G";
              format_degraded = "MEMORY < %available";
            };
          };
          "volume master" = {
            position = 2;
            settings = {
              color_degraded = "#333333";
              format = "vol: %volume";
              format_muted = "vol: ---";
            };
          };
          "tztime local" = {
            position = 4;
            settings = {
              format = "%Y-%m-%d %H:%M:%S (%A)";
            };
          };
        } // (optionalAttrs cfg.battery {
          "battery 0" = {
            position = 3;
            settings = {
              format = "bat%status: %percentage";
              status_chr = "(+)";
              status_bat = "";
              status_unk = "(?)";
              status_full = "(+)";
              status_idle = "";
              low_threshold = 30;
            };
          };
        }) // (optionalAttrs config.chuj.stuff.mpd.enable {
          "read_file mpd" = {
            position = -1;
            settings = {
              format = "%content";
              format_bad = "mpdstatus file not found";
              path = config.chuj.stuff.mpd.statusFile;
              color_good = "#ffffff";
            };
          };
        });
      };
    };
  };
}