{ config, lib, pkgs, ... }:
let
  inherit (lib)
    mkIf
    mkOptionDefault
  ;

  isEnabled = config.my.home.x.enable;

  myTerminal =
    # FIXME: fix when terminal is setup in home
    # if config.my.home.terminal.program != null
    if true
    then "alacritty"
    else "i3-sensible-terminal";

  alt = "Mod1"; # `Alt` key
  modifier = "Mod4"; # `Super` key

  logoutMode = "[L]ogout, [S]uspend, [P]oweroff, [R]eboot";

  i3Theme = config.my.theme.i3Theme;
in
{
  config = mkIf isEnabled {
    my.home = {
      flameshot.enable = true;
    };

    home.packages = [ pkgs.betterlockscreen ];

    xsession.windowManager.i3 = {
      enable = true;

      config = {
        inherit modifier;

        bars =
          let
            barConfigPath =
              config.xdg.configFile."i3status-rust/config-top.toml".target;
          in
          [
            {
              statusCommand = "i3status-rs ${barConfigPath}";
              position = "top";
              fonts = {
                names = [ "DejaVuSansMono" "FontAwesome5Free" ];
                size = 9.0;
              };

              colors = i3Theme.bar;

              trayOutput = "primary";

              # disable mouse scroll wheel in bar
              extraConfig = ''
                bindsym button4 nop
                bindsym button5 nop
              '';
            }
          ];

        colors = {
          inherit (i3Theme)
            focused
            focusedInactive
            unfocused
            urgent
          ;
        };

        focus = {
          followMouse = true;
          mouseWarping = true;
        };

        workspaceAutoBackAndForth = true;

        fonts = {
          names = [ "DejaVu Sans Mono" ];
          size = 8.0;
        };

        keybindings = mkOptionDefault {
          "${modifier}+Shift+e" = ''mode "${logoutMode}"'';
          "${modifier}+i" = "exec emacsclient -c";

          # Volume handling
          "XF86AudioRaiseVolume" = "exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ +5%";
          "XF86AudioLowerVolume" = "exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ -5%";
          "XF86AudioMute" = "exec --no-startup-id pactl set-sink-mute @DEFAULT_SINK@ toggle";
          "XF86AudioMicMute" = "exec --no-startup-id pactl set-source-mute @DEFAULT_SOURCE@ toggle";

          "XF86AudioPlay" = "exec --no-startup-id dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Play";
          "XF86AudioPause" = "exec --no-startup-id dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Pause";

          "XF86MonBrightnessDown" = "exec --no-startup-id light -U 5";
          "XF86MonBrightnessUp" = "exec --no-startup-id light -A 5";
          "${modifier}+XF86MonBrightnessDown" = "exec --no-startup-id light -U 0.1";
          "${modifier}+XF86MonBrightnessUp" = "exec --no-startup-id light -A 0.1";

          "${modifier}+l" = "exec --no-startup-id betterlockscreen --lock";
          "${modifier}+d" = "exec ${pkgs.rofi}/bin/rofi -show run";
        };

        modes =
          let
            makeModeBindings = attrs: attrs // {
              "Escape" = "mode default";
              "Return" = "mode default";
            };
          in
            mkOptionDefault {
              "${logoutMode}" = makeModeBindings {
                "l" = "exec --no-startup-id i3-msg exit, mode default";
                "s" = "exec --no-startup-id betterlockscreen --suspend, mode default";
                "p" = "exec --no-startup-id systemctl poweroff, mode default";
                "r" = "exec --no-startup-id systemctl reboot, mode default";
              };
            };

        terminal = myTerminal;

        assigns = {
          "10" = [
            { class = "Slack"; }
            { class = "discord"; }
          ];
        };

        window.commands = [
          { command = "border pixel 2"; criteria = { class = "Alacritty"; }; }

          # NOTE: should be done with an assign command, but Spotify doesn't set
          # its class until after initialization, so has to be done this way.
          #
          # See https://i3wm.org/docs/userguide.html#assign_workspace
          {
            criteria = { class = "Spotify"; };
            command = "move --no-auto-back-and-forth to workspace 8";
          }
        ];
      };
    };
  };
}