{ pkgs, lib, self, ... }: {
  # List packages installed in system profile. To search by name, run:
  # $ nix-env -qaP | grep wget
  environment.systemPackages = [ ];

  nix.settings = {
    experimental-features = [ "nix-command" "flakes" ];
    auto-optimise-store = true;
  };

  environment.shells = with pkgs; [ bashInteractive zsh fish ];

  # Auto upgrade nix package and the daemon service.
  services.nix-daemon.enable = true;

  # Enable alternative shell support in nix-darwin.
  # programs.fish.enable = true;

  services.yabai =
    let
      gap = 10;

      gapListParts = builtins.map
        (x: lib.attrsets.nameValuePair (x + "_padding") gap)
        [ "top" "bottom" "left" "right" ];

      gapSettings = (builtins.listToAttrs gapListParts) // { window_gap = gap; };
    in
    {
      enable = true;
      enableScriptingAddition = true;
      config = {
        layout = "bsp";
        window_shadow = "float";

        mouse_modifier = "fn";
        mouse_action1 = "move";
        mouse_action2 = "resize";
        focus_follows_mouse = "autoraise";
        mouse_follows_focus = "off";
        window_topmost = "off";
      } // gapSettings;
      extraConfig = ''
        yabai -m rule --add app="^System Settings$" manage=off
        yabai -m rule --add app="Python" manage=off
        yabai -m rule --add app="macroquad_playground" manage=off
        yabai -m rule --add app="^coreautha$" manage=off
      '';
    };

  services.skhd =
    let
      yabaiSwapToFullscreen = pkgs.writeShellApplication {
        name = "yabai-swap-to-fullscreen";
        runtimeInputs = [ pkgs.jq pkgs.yabai ];
        text = ''
          focus() {
            yabai -m space --focus "$1"
          }

          get_fs_displays() {
            yabai -m query --spaces | jq -c 'map(select(."is-native-fullscreen" == true))'
          }

          get_visible() {
            printf '%s' "$1" | jq -c 'map(select(."is-visible" == true))'
          }

          is_empty() {
            length="$(printf '%s' "$1" | jq 'length')"
            [ "$length" -le 0 ]
          }

          first() {
            printf '%s' "$1" | jq 'sort_by(.index) | .[0].index'
          }

          try_focus_visible() {
            # This should be at max length 1. Though this may likely break in a multimonitor environment
            visible_fullscreen_displays=$(get_visible "$1")

            if ! is_empty "$visible_fullscreen_displays"; then
              visible_index=$(printf '%s' "$visible_fullscreen_displays" | jq -c '.[0].index')
              next_index=$((visible_index + 1))
              if [ "$(printf '%s' "$fullscreen_displays" | jq "map(select(.index == $next_index)) | length")" -gt "0" ]; then
                focus "$next_index"
                return 0
              fi
            fi

            return 1
          }

          main() {
            fullscreen_displays="$(get_fs_displays)"

            is_empty "$fullscreen_displays" && focus 1 && return 1

            try_focus_visible "$fullscreen_displays" && return 1

            focus "$(first "$fullscreen_displays")"
          }

          main
        '';
      };

      # Idk if macos' 'open' is something I can find in nixpkgs lmfao
      newAlacrityWindow = pkgs.writeShellApplication {
        name = "new-alacritty-window";
        runtimeInputs = [ pkgs.alacritty ];
        text = ''
          alacritty_output=$(alacritty msg create-window 2>/dev/null)

          if [ -z "$alacritty_output" ]; then
            open /Applications/Alacritty.app
          fi
        '';
      };

      yabai = lib.getExe pkgs.yabai;
    in
    {
      enable = true;
      skhdConfig = ''
        # float / unfloat window and center on screen
        alt - t : ${yabai} -m window --toggle float --grid 4:4:1:1:2:2

        # open terminal window using shell script
        cmd - return : ${lib.getExe newAlacrityWindow}

        # rebind space switching
        ctrl - left : ${yabai} -m space --focus prev || ${yabai} -m space --focus last
        ctrl - right : ${yabai} -m space --focus next || ${yabai} -m space --focus first

        # focusing specific spaces
        cmd - 1 : ${yabai} -m space --focus 1
        cmd - 2 : ${yabai} -m space --focus 2
        cmd - 3 : ${yabai} -m space --focus 3
        cmd - 4 : ${yabai} -m space --focus 4
        cmd - 5 : ${yabai} -m space --focus 5
        cmd - 6 : ${yabai} -m space --focus 6
        cmd - 7 : ${yabai} -m space --focus 7
        cmd - 8 : ${yabai} -m space --focus 8
        cmd - 9 : ${yabai} -m space --focus 9
        cmd - 0x32 : ${lib.getExe yabaiSwapToFullscreen}


        # moving windows
        cmd + shift - 1 : ${yabai} -m window --space 1
        cmd + shift - 2 : ${yabai} -m window --space 2
        cmd + shift - 3 : ${yabai} -m window --space 3
        # cmd + shift - 4 : ${yabai} -m window --space 4
        cmd + shift - 5 : ${yabai} -m window --space 5
        cmd + shift - 6 : ${yabai} -m window --space 6
        cmd + shift - 7 : ${yabai} -m window --space 7
        cmd + shift - 8 : ${yabai} -m window --space 8
        cmd + shift - 9 : ${yabai} -m window --space 9
        cmd + shift - 0x32 : ${yabai} -m window --toggle native-fullscreen

        # cmd + alt - 4 : "cmd + shift - 4"
      '';
    };

  home-manager.sharedModules = [
    {
      home.file.".config/yabai/yabaiExe".source = lib.getExe pkgs.yabai;
      home.packages = with pkgs; [ yabai ];
    }
  ];

  security.pam.enableSudoTouchIdAuth = true;

  users.users.zynh = {
    name = "zynh";
    home = "/Users/zynh";
  };

  home-manager = {
    users = { "zynh" = import ./home.nix; };
    backupFileExtension = "backup";
  };

  fonts.packages = with pkgs; [
    (nerdfonts.override { fonts = [ "JetBrainsMono" ]; })
  ];

  # Set Git commit hash for darwin-version.
  system.configurationRevision = self.rev or self.dirtyRev or null;
  # $ darwin-rebuild changelog
  system.stateVersion = 5;
}