{
  config,
  pkgs,
  lib,
  inputs,
  osConfig ? null,
  ...
}:
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;
  fcitx5 = lib.getExe' osConfig.i18n.inputMethod.package "fcitx5";

  polkit-kde-agent = getExe' pkgs.kdePackages.polkit-kde-agent-1 "polkit-kde-agent";
  wpctl = getExe' pkgs.wireplumber "wpctl";
  waypaper = getExe pkgs.waypaper;
  alacritty = getExe config.programs.alacritty.package;
  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+Shift+Slash" [
        (flag "show-hotkey-overlay")
      ])
      (plain "Mod+T" [
        (spawn [
          alacritty
        ])
      ])
      (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")
        ]
      )
      (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 [ polkit-kde-agent ])
    (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 "click-method" [ "clickfinger" ])
        (flag "dwt")
        (leaf "scroll-method" [ "two-finger" ])
        (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 "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")
      ])
    ])
  ] # others
)
++ (
  let
    window-rule = plain "window-rule";
    match = leaf "match";
  in
  [
    (window-rule [
      (leaf "draw-border-with-background" [ true ])
      (leaf "geometry-corner-radius" [ 12.0 ])
      (leaf "clip-to-geometry" [ true ])
    ])
    (window-rule [
      (match [ { app-id = "^org\\.keepassxc\\.KeePassXC$"; } ])
      (match [ { app-id = "^org\\.gnome\\.World\\.Secrets$"; } ])
      (leaf "block-out-from" [ "screen-capture" ])
    ])
    (window-rule [
      (match [ { is-active = true; } ])
      (leaf "opacity" [ 0.95 ])
    ])
    (window-rule [
      (match [ { is-active = false; } ])
      (leaf "opacity" [ 0.8 ])
      (leaf "draw-border-with-background" [ false ])
    ])
    (window-rule [
      (match [ { app-id = "^Alacritty$"; } ])
      (match [ { app-id = "^com\\.mitchellh\\.ghostty$"; } ])
      (match [ { app-id = "^neovide$"; } ])
      (leaf "draw-border-with-background" [ false ])
    ])
    (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
)
++ (
  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
)
