{ config, inputs, pkgs, ... }:
let
  wallpaperDir    = "${config.home.homeDirectory}/.config/wallpapers";
  defaultWallpaper = "${wallpaperDir}/even-in-arcadia.png";

  noctaliaIpc = pkgs.writeShellScriptBin "noctalia-ipc" ''
    set -eu
    exec noctalia msg "$@"
  '';
in
{
  imports = [ inputs.noctalia.homeModules.default ];

  home.packages = [ noctaliaIpc ];

  # Wallpapers tracked in the repo; linked to ~/.config/wallpapers for noctalia
  xdg.configFile."wallpapers".source = ./wallpapers;

  programs.noctalia = {
    enable = true;
    settings = {
      bar.default = {
        # "group:sysmon" renders as one capsule containing cpu + ram
        start          = [ "launcher" "clipboard" "group:sysmon" "network" ];
        center         = [ "clock" ];
        end            = [ "notifications" "volume" "brightness" "battery" "control-center" "session" ];
        thickness      = 40;
        padding        = 10;
        radius         = 0;
        margin_edge    = 0;
        margin_ends    = 0;
        widget_spacing = 8;

        capsule_group = [
          {
            id      = "sysmon";
            members = [ "cpu" "ram" ];
            fill    = "surface_variant";
            opacity = 1.0;
            padding = 6.0;
          }
        ];
      };

      idle = {
        behavior_order = [ "lock" "screen-off" ];
        behavior = {
          lock = {
            action  = "lock";
            enabled = true;
            timeout = 600;
          };
          screen-off = {
            action  = "screen_off";
            enabled = true;
            timeout = 660;
          };
        };
      };

      lockscreen.wallpaper = defaultWallpaper;

      nightlight.enabled = true;

      osd.position = "top_right";

      shell = {
        font_family         = "JetBrainsMono Nerd Font";
        polkit_agent        = true;
        corner_radius_scale = 1.0;
        animation.speed     = 1.5;
        panel = {
          clipboard_placement     = "attached";
          launcher_placement      = "attached";
          launcher_session_search = true;
          panel_overlap           = 1;    # pull panel flush against bar to hide seam
          contact_shadow          = true; # gradient at meeting point masks any residual gap
        };
        shadow.alpha = 0.5;
      };

      theme.builtin = "Kanagawa";

      wallpaper = {
        enabled      = true;
        directory    = wallpaperDir;
        default.path = defaultWallpaper;
      };
    };
  };
}