{
  config,
  lib,
  inputs,
  ...
}:
{
  config.david.programs.niri.config =
    let
      inherit (lib) getExe getExe';
      inherit (inputs.niri-flake.lib.kdl)
        # node with args, props and children
        # node:: \lambda name -> [argOrProp] -> [child] -> Output
        # arg: single value
        # prop: attr contains one or more key-value pair
        # children: node
        node
        # node without children
        # leaf:: \lambda name -> [argOrProp] -> Output
        leaf
        # node only name
        # flag:: \lambda name -> Output
        flag
        # node without args/props
        # plain:: \lambda name -> [child] -> Output
        plain
        ;

      # swaylock = getExe config.programs.swaylock.package;
      # fuzzel = getExe config.programs.fuzzel.package;
      # waybar = getExe config.programs.waybar.package;
      # swaync = getExe config.services.swaync.package;

      # wpctl = getExe' pkgs.wireplumber "wpctl";
      # waypaper = getExe pkgs.waypaper;
      default-terminal = getExe config.programs.ghostty.package;
      default-browser = getExe' config.programs.zen-browser.package "zen-twilight";
      # wl-paste = getExe' pkgs.wl-clipboard "wl-paste";
      # cliphist = getExe' pkgs.cliphist "cliphist";
      # cliphist-fuzzel-img = getExe' pkgs.cliphist "cliphist-fuzzel-img";
      # wl-clip-persist = getExe pkgs.wl-clip-persist;
    in
    (
      let
        spawn = leaf "spawn";
      in
      [
        (plain "binds" [
          # (plain "Mod+V" [
          #   (spawn [cliphist-fuzzel-img])
          # ])
          # (plain "Mod+Shift+P" [
          #   (spawn [
          #     swaylock
          #     "--screenshots"
          #     "--clock"
          #     "--indicator"
          #     "--indicator-radius"
          #     "100"
          #     "--indicator-thickness"
          #     "7"
          #     "--effect-blur"
          #     "7x5"
          #     "--effect-vignette"
          #     "0.5:0.5"
          #     "--grace"
          #     "2"
          #     "--fade-in"
          #     "0.5"
          #   ])
          # ])
          (plain "Mod+B" [
            (spawn [ default-browser ])
          ])
          (plain "Mod+Shift+Slash" [
            (flag "show-hotkey-overlay")
          ])
          (plain "Mod+T" [
            (spawn [
              default-terminal
            ])
          ])
          (plain "Mod+Shift+T" [
            (flag "toggle-column-tabbed-display")
          ])
          # (plain "Mod+Space" [
          #   (spawn [fuzzel])
          # ])
          # (
          #   node "XF86AudioRaiseVolume"
          #   [{allow-when-locked = true;}]
          #   [
          #     (spawn [
          #       wpctl
          #       "set-volume"
          #       "@DEFAULT_AUDIO_SINK@"
          #       "0.1+"
          #     ])
          #   ]
          # )
          # (
          #   node "XF86AudioLowerVolume"
          #   [{allow-when-locked = true;}]
          #   [
          #     (spawn [
          #       wpctl
          #       "set-volume"
          #       "@DEFAULT_AUDIO_SINK@"
          #       "0.1-"
          #     ])
          #   ]
          # )
          # (
          #   node "XF86AudioMute"
          #   [{allow-when-locked = true;}]
          #   [
          #     (spawn [
          #       wpctl
          #       "set-volume"
          #       "@DEFAULT_AUDIO_SINK@"
          #       "toggle"
          #     ])
          #   ]
          # )
          # (
          #   node "XF86AudioMicMute"
          #   [{allow-when-locked = true;}]
          #   [
          #     (spawn [
          #       wpctl
          #       "set-volume"
          #       "@DEFAULT_AUDIO_SOURCE@"
          #       "toggle"
          #     ])
          #   ]
          # )
          (plain "Mod+Q" [
            (flag "close-window")
          ])
          (node "Mod+O"
            [ { repeat = false; } ]
            [
              (flag "toggle-overview")
            ]
          )
          (plain "Mod+Left" [
            (flag "focus-column-left")
          ])
          (plain "Mod+Down" [
            (flag "focus-window-down")
          ])
          (plain "Mod+Up" [
            (flag "focus-window-up")
          ])
          (plain "Mod+Right" [
            (flag "focus-column-right")
          ])
          (plain "Mod+H" [
            (flag "focus-column-or-monitor-left")
          ])
          (plain "Mod+J" [
            (flag "focus-window-or-workspace-down")
          ])
          (plain "Mod+K" [
            (flag "focus-window-or-workspace-up")
          ])
          (plain "Mod+L" [
            (flag "focus-column-or-monitor-right")
          ])
          (plain "Mod+Shift+Left" [
            (flag "move-column-left")
          ])
          (plain "Mod+Shift+Down" [
            (flag "move-window-down")
          ])
          (plain "Mod+Shift+Up" [
            (flag "move-window-up")
          ])
          (plain "Mod+Shift+Right" [
            (flag "move-column-right")
          ])
          (plain "Mod+Shift+H" [
            (flag "move-column-left-or-to-monitor-left")
          ])
          (plain "Mod+Shift+J" [
            (flag "move-window-down-or-to-workspace-down")
          ])
          (plain "Mod+Shift+K" [
            (flag "move-window-up-or-to-workspace-up")
          ])
          (plain "Mod+Shift+L" [
            (flag "move-column-right-or-to-monitor-right")
          ])
          (plain "Mod+Home" [
            (flag "focus-column-first")
          ])
          (plain "Mod+End" [
            (flag "focus-column-last")
          ])
          (plain "Mod+Ctrl+Home" [
            (flag "move-column-to-first")
          ])
          (plain "Mod+Ctrl+End" [
            (flag "move-column-to-last")
          ])
          (plain "Mod+Ctrl+Left" [
            (flag "focus-monitor-left")
          ])
          (plain "Mod+Ctrl+Down" [
            (flag "focus-monitor-down")
          ])
          (plain "Mod+Ctrl+Up" [
            (flag "focus-monitor-up")
          ])
          (plain "Mod+Ctrl+Right" [
            (flag "focus-monitor-right")
          ])
          (plain "Mod+Ctrl+H" [
            (flag "focus-monitor-left")
          ])
          (plain "Mod+Ctrl+J" [
            (flag "focus-monitor-down")
          ])
          (plain "Mod+Ctrl+K" [
            (flag "focus-monitor-up")
          ])
          (plain "Mod+Ctrl+L" [
            (flag "focus-monitor-right")
          ])
          (plain "Mod+Shift+Ctrl+Left" [
            (flag "move-column-to-monitor-left")
          ])
          (plain "Mod+Shift+Ctrl+Down" [
            (flag "move-column-to-monitor-down")
          ])
          (plain "Mod+Shift+Ctrl+Up" [
            (flag "move-column-to-monitor-up")
          ])
          (plain "Mod+Shift+Ctrl+Right" [
            (flag "move-column-to-monitor-right")
          ])
          (plain "Mod+Shift+Ctrl+H" [
            (flag "move-column-to-monitor-left")
          ])
          (plain "Mod+Shift+Ctrl+J" [
            (flag "move-column-to-monitor-down")
          ])
          (plain "Mod+Shift+Ctrl+K" [
            (flag "move-column-to-monitor-up")
          ])
          (plain "Mod+Shift+Ctrl+L" [
            (flag "move-column-to-monitor-right")
          ])
          (plain "Mod+Page_Down" [
            (flag "focus-workspace-down")
          ])
          (plain "Mod+Page_Up" [
            (flag "focus-workspace-up")
          ])
          (plain "Mod+U" [
            (flag "focus-workspace-down")
          ])
          (plain "Mod+I" [
            (flag "focus-workspace-up")
          ])
          (plain "Mod+Shift+Page_Down" [
            (flag "move-column-to-workspace-down")
          ])
          (plain "Mod+Shift+Page_Up" [
            (flag "move-column-to-workspace-up")
          ])
          (plain "Mod+Shift+U" [
            (flag "move-column-to-workspace-down")
          ])
          (plain "Mod+Shift+I" [
            (flag "move-column-to-workspace-up")
          ])
          (plain "Mod+Ctrl+Page_Down" [
            (flag "move-workspace-down")
          ])
          (plain "Mod+Ctrl+Page_Up" [
            (flag "move-workspace-up")
          ])
          (plain "Mod+Ctrl+U" [
            (flag "move-workspace-down")
          ])
          (plain "Mod+Ctrl+I" [
            (flag "move-workspace-up")
          ])
          (node "Mod+Shift+WheelScrollDown"
            [ { cooldown-ms = 150; } ]
            [
              (flag "focus-workspace-down")
            ]
          )
          (node "Mod+Shift+WheelScrollUp"
            [ { cooldown-ms = 150; } ]
            [
              (flag "focus-workspace-up")
            ]
          )
          (plain "Mod+WheelScrollDown" [
            (flag "focus-column-right")
          ])
          (plain "Mod+WheelScrollUp" [
            (flag "focus-column-left")
          ])
          (plain "Mod+1" [
            (leaf "focus-workspace" [ 1 ])
          ])
          (plain "Mod+2" [
            (leaf "focus-workspace" [ 2 ])
          ])
          (plain "Mod+3" [
            (leaf "focus-workspace" [ 3 ])
          ])
          (plain "Mod+4" [
            (leaf "focus-workspace" [ 4 ])
          ])
          (plain "Mod+5" [
            (leaf "focus-workspace" [ 5 ])
          ])
          (plain "Mod+6" [
            (leaf "focus-workspace" [ 6 ])
          ])
          (plain "Mod+7" [
            (leaf "focus-workspace" [ 7 ])
          ])
          (plain "Mod+8" [
            (leaf "focus-workspace" [ 8 ])
          ])
          (plain "Mod+9" [
            (leaf "focus-workspace" [ 9 ])
          ])
          (plain "Mod+Shift+1" [
            (leaf "move-column-to-workspace" [ 1 ])
          ])
          (plain "Mod+Shift+2" [
            (leaf "move-column-to-workspace" [ 2 ])
          ])
          (plain "Mod+Shift+3" [
            (leaf "move-column-to-workspace" [ 3 ])
          ])
          (plain "Mod+Shift+4" [
            (leaf "move-column-to-workspace" [ 4 ])
          ])
          (plain "Mod+Shift+5" [
            (leaf "move-column-to-workspace" [ 5 ])
          ])
          (plain "Mod+Shift+6" [
            (leaf "move-column-to-workspace" [ 6 ])
          ])
          (plain "Mod+Shift+7" [
            (leaf "move-column-to-workspace" [ 7 ])
          ])
          (plain "Mod+Shift+8" [
            (leaf "move-column-to-workspace" [ 8 ])
          ])
          (plain "Mod+Shift+9" [
            (leaf "move-column-to-workspace" [ 9 ])
          ])
          (plain "Mod+F" [
            (flag "toggle-window-floating")
          ])
          (plain "Mod+Shift+F" [
            (flag "toggle-windowed-fullscreen")
          ])
          (plain "Mod+Tab" [
            (flag "focus-window-previous")
          ])
          (plain "Mod+Shift+Tab" [
            (flag "switch-focus-between-floating-and-tiling")
          ])
          (plain "Mod+BracketLeft" [
            (flag "consume-or-expel-window-left")
          ])
          (plain "Mod+BracketRight" [
            (flag "consume-or-expel-window-right")
          ])
          (plain "Mod+Comma" [
            (flag "consume-window-into-column")
          ])
          (plain "Mod+Period" [
            (flag "expel-window-from-column")
          ])
          (node "Mod+R"
            [ { repeat = false; } ]
            [
              (flag "switch-preset-column-width")
            ]
          )
          (node "Mod+Shift+R"
            [ { repeat = false; } ]
            [
              (flag "switch-preset-window-height")
            ]
          )
          (plain "Mod+Ctrl+R" [
            (flag "reset-window-height")
          ])
          (node "Mod+M"
            [ { repeat = false; } ]
            [
              (flag "maximize-column")
            ]
          )
          (node "Mod+Shift+M"
            [ { repeat = false; } ]
            [
              (flag "fullscreen-window")
            ]
          )
          (node "Mod+Ctrl+M"
            [ { repeat = false; } ]
            [
              (flag "maximize-window-to-edges")
            ]
          )
          (plain "Mod+Z" [
            (flag "center-column")
          ])
          (node "Mod+Minus"
            [ { repeat = false; } ]
            [
              (leaf "set-column-width" [ "-10%" ])
            ]
          )
          (node "Mod+Equal"
            [ { repeat = false; } ]
            [
              (leaf "set-column-width" [ "+10%" ])
            ]
          )
          (node "Mod+Shift+Minus"
            [ { repeat = false; } ]
            [
              (leaf "set-window-height" [ "-10%" ])
            ]
          )
          (node "Mod+Shift+Equal"
            [ { repeat = false; } ]
            [
              (leaf "set-window-height" [ "+10%" ])
            ]
          )
          (plain "Print" [
            (flag "screenshot")
          ])
          (plain "Ctrl+Print" [
            (flag "screenshot-screen")
          ])
          (plain "Alt+Print" [
            (flag "screenshot-window")
          ])
          (plain "Mod+Shift+Q" [
            (flag "quit")
          ])
          (plain "Mod+E" [
            (flag "expand-column-to-available-width")
          ])
          (plain "Mod+Shift+S" [
            (flag "toggle-keyboard-shortcuts-inhibit")
          ])
          (plain "Mod+Shift+C" [
            (flag "set-dynamic-cast-window")
          ])
          (plain "Mod+Shift+Ctrl+C" [
            (flag "clear-dynamic-cast-target")
          ])
        ])
      ] # binds
    )
    ++
      # let
      #   spawn-at-startup = leaf "spawn-at-startup";
      # in
      [
        (leaf "screenshot-path" [ "${config.xdg.userDirs.pictures}/screenshots/%Y-%m-%d_%H:%M:%S.png" ])
        (plain "hotkey-overlay" [
          (flag "skip-at-startup")
        ])
        (flag "prefer-no-csd")
        # (spawn-at-startup [waybar])
        # (spawn-at-startup [swaync])
        # (spawn-at-startup [
        #   waypaper
        #   "--restore"
        # ])
        # (spawn-at-startup [
        #   wl-paste
        #   "--watch"
        #   cliphist
        #   "store"
        # ])
        # (spawn-at-startup [
        #   wl-clip-persist
        #   "--clipboard"
        #   "regular"
        # ])
        # (spawn-at-startup [
        #   fcitx5
        #   "--replace"
        # ])
        (plain "input" [
          (plain "touchpad" [
            (leaf "scroll-method" [ "two-finger" ])
            (flag "middle-emulation")
            (flag "tap")
            (flag "dwt")
            (leaf "drag" [ true ])
            (leaf "click-method" [ "clickfinger" ])
            (leaf "tap-button-map" [ "left-right-middle" ])
          ])
        ])
        (plain "cursor" [
          (leaf "hide-after-inactive-ms" [ 3000 ])
          (flag "hide-when-typing")
        ])
        (plain "layout" [
          (leaf "background-color" [ "transparent" ])
          (plain "border" [
            (flag "off")
            (leaf "width" [ 4 ])
            (leaf "active-color" [ "#7fc8ff" ])
            (leaf "inactive-color" [ "#505050" ])
          ])
          (plain "focus-ring" [
            # (flag "off")
            (leaf "width" [ 4 ])
            (leaf "active-color" [ "#7fc8ff" ])
            (leaf "active-gradient" [
              {
                from = "#e00a54";
                to = "#b8de17";
                angle = 45;
              }
            ])
            (leaf "inactive-color" [ "#505050" ])
          ])
          (plain "tab-indicator" [
            (flag "hide-when-single-tab")
          ])
          (plain "preset-column-widths" [
            (leaf "proportion" [ (1. / 4.) ])
            (leaf "proportion" [ (1. / 3.) ])
            (leaf "proportion" [ (1. / 2.) ])
            (leaf "proportion" [ (2. / 3.) ])
            (leaf "proportion" [ (3. / 4.) ])
            (leaf "proportion" [ (4. / 4.) ])
          ])
          (flag "always-center-single-column")
          (leaf "center-focused-column" [ "never" ])
          (leaf "default-column-display" [ "tabbed" ])
          (plain "default-column-width" [
            (leaf "proportion" [ (1. / 2.) ])
          ])
          (flag "empty-workspace-above-first")
          (leaf "gaps" [ 16 ])
        ])
        (plain "animations" [
          (plain "window-close" [
            (leaf "spring" [
              {
                damping-ratio = 1.0;
                stiffness = 800;
                epsilon = 0.0001;
              }
            ])
          ])
        ])
        (plain "overview" [
          (plain "workspace-shadow" [
            (flag "off")
          ])
        ])
        (plain "blur" [
          (leaf "passes" [ 4 ])
          (leaf "offset" [ 4 ])
          (leaf "noise" [ 0.02 ])
          (leaf "saturation" [ 1.0 ])
        ])
      ] # others
    ++ (
      let
        window-rule = plain "window-rule";
        match = leaf "match";
      in
      [
        (window-rule [
          (leaf "draw-border-with-background" [ true ])
          (leaf "geometry-corner-radius" [ 0.0 ])
          (leaf "clip-to-geometry" [ true ])
        ])
        (window-rule [
          (match [ { app-id = "^org\\.keepassxc\\.KeePassXC$"; } ])
          (match [ { app-id = "^org\\.gnome\\.World\\.Secrets$"; } ])
          (leaf "block-out-from" [ "screen-capture" ])
        ])
        (window-rule [
          (plain "background-effect" [
            (leaf "blur" [ true ])
          ])
        ])
        (window-rule [
          (match [ { is-active = true; } ])
          (leaf "opacity" [ 1.0 ])
        ])
        (window-rule [
          (match [ { is-active = false; } ])
          (leaf "opacity" [ 0.8 ])
          (leaf "draw-border-with-background" [ false ])
        ])
        (window-rule [
          (match [ { app-id = "^Alacritty$"; } ])
          (match [ { app-id = "^com\\.mitchellh\\.ghostty$"; } ])
          (match [ { app-id = "^neovide$"; } ])
          (leaf "draw-border-with-background" [ false ])
          (leaf "opacity" [ 0.65 ])
        ])
        (window-rule [
          (match [ { app-id = "^org\\.kde\\.polkit-kde-authentication-agent-1$"; } ])
          (leaf "open-floating" [ true ])
        ])
        (window-rule [
          (match [ { app-id = "^swayimg$"; } ])
          (leaf "draw-border-with-background" [ false ])
          (leaf "open-floating" [ true ])
        ])
        (window-rule [
          (match [ { is-window-cast-target = true; } ])
          (plain "focus-ring" [
            (leaf "active-color" [ "#f38ba8" ])
            (leaf "inactive-color" [ "#7d0d2d" ])
          ])
          (plain "border" [
            (leaf "active-color" [ "#f38ba8" ])
            (leaf "inactive-color" [ "#7d0d2d" ])
          ])
          (plain "tab-indicator" [
            (leaf "active-color" [ "#f38ba8" ])
            (leaf "inactive-color" [ "#7d0d2d" ])
          ])
          (plain "shadow" [
            (flag "on")
          ])
        ])
        (window-rule [
          (match [
            {
              app-id = "^org\\.telegram\\.desktop$";
              title = "Media viewer";
            }
          ])
          (match [
            {
              app-id = "^QQ$";
              title = "图片查看器";
            }
          ])
          (leaf "open-floating" [ true ])
          (leaf "open-fullscreen" [ false ])
        ])
        (window-rule [
          (match [
            {
              app-id = "^wechat$";
              title = "^wechat$";
            }
          ])
          (leaf "open-focused" [ false ])
        ])
        (window-rule [
          (match [
            {
              app-id = "^steam$";
              title = "^notificationtoasts_\\d+_desktop$";
            }
          ])
          (leaf "open-floating" [ true ])
          (leaf "open-focused" [ false ])
          (leaf "default-floating-position" [
            {
              x = 10;
              y = 10;
              "relative-to" = "bottom-right";
            }
          ])
          (leaf "clip-to-geometry" [ false ])
        ])
        (window-rule [
          (match [
            {
              app-id = "^zen-twilight$";
              title = "^画中画$";
            }
          ])
          (leaf "open-floating" [ true ])
          (leaf "open-focused" [ false ])
        ])
      ] # window-rule
    )
  # ++ (
  #   let
  #     layer-rule = plain "layer-rule";
  #     match = leaf "match";
  #   in [
  #     (layer-rule [
  #       (match [{namespace = "^swaync-notification-window$";}])
  #       (match [{namespace = "^swaync-control-center$";}])
  #       (leaf "block-out-from" ["screen-capture"])
  #     ])
  #     (layer-rule [
  #       (match [{namespace = "^launcher$";}])
  #       (plain "shadow" [
  #         (flag "on")
  #       ])
  #       (leaf "geometry-corner-radius" [10.0])
  #     ])
  #     (layer-rule [
  #       (match [{namespace = "^mpvpaper$";}])
  #       (leaf "place-within-backdrop" [true])
  #     ])
  #   ] # layer-rule
  # )
  ;
}