# Waybar — two-tier theming:
#
#  1. Default: structure, fonts, geometry AND palette baked from
#     theme-state.json (colors as GTK named colors, @define-color).
#
#  2. Whole-swap: themes with their own visual identity ship
#     <themesDir>/<slug>/waybar.css (and optionally waybar.jsonc) which
#     replace the generated style/layout entirely. Probed at eval time —
#     pure, it's flake source.
{ config, lib, ... }:

let
  t = config.nomarchy.theme;

  # Per-theme override probe.
  assetDir = config.nomarchy.themesDir + "/${t.slug}";
  styleOverride = assetDir + "/waybar.css";
  configOverride = assetDir + "/waybar.jsonc";
  hasStyleOverride = builtins.pathExists styleOverride;
  hasConfigOverride = builtins.pathExists configOverride;

  # The palette as GTK named colors, straight from the JSON.
  colorDefs = lib.concatStringsSep "\n"
    (lib.mapAttrsToList (name: value: "@define-color ${name} ${value};") t.colors);

  generatedSettings = {
    layer = "top";
    position = "top";
    height = 34;
    margin-top = t.ui.gapsOut;
    margin-left = t.ui.gapsOut;
    margin-right = t.ui.gapsOut;
    spacing = 8;

    # waybar re-reads style.css when it changes on disk, so a
    # home-manager switch restyles the running bar without a restart.
    reload_style_on_change = true;

    modules-left = [ "hyprland/workspaces" "hyprland/window" ];
    modules-center = [ "clock" ];
    modules-right = [ "tray" "pulseaudio" "network" "cpu" "memory" "battery" ];

    "hyprland/workspaces" = {
      format = "{icon}";
      on-click = "activate";
    };

    "hyprland/window" = {
      max-length = 48;
      separate-outputs = true;
    };

    clock = {
      format = "{:%H:%M}";
      format-alt = "{:%A %d %B %Y}";
      tooltip-format = "<tt><small>{calendar}</small></tt>";
    };

    pulseaudio = {
      format = "{icon} {volume}%";
      format-muted = "󰝟";
      format-icons.default = [ "󰕿" "󰖀" "󰕾" ];
      on-click = "pamixer -t";
    };

    network = {
      format-wifi = "󰤨 {essid}";
      format-ethernet = "󰈀";
      format-disconnected = "󰤭";
      tooltip-format = "{ipaddr} via {gwaddr}";
    };

    cpu.format = "󰍛 {usage}%";
    memory.format = "󰾆 {percentage}%";

    battery = {
      states = { warning = 25; critical = 10; };
      format = "{icon} {capacity}%";
      format-charging = "󰂄 {capacity}%";
      format-icons = [ "󰁺" "󰁼" "󰁾" "󰂀" "󰁹" ];
    };

    tray.spacing = 8;
  };

  generatedStyle = ''
    /* Palette baked from theme-state.json */
    ${colorDefs}

    * {
      font-family: "${t.fonts.ui}", "${t.fonts.mono}";
      font-size: ${toString t.fonts.size}pt;
      min-height: 0;
    }

    window#waybar {
      background: alpha(@base, 0.85);
      color: @text;
      border: ${toString t.ui.borderSize}px solid alpha(@accent, 0.4);
      border-radius: ${toString t.ui.rounding}px;
    }

    #workspaces button {
      padding: 0 8px;
      color: @muted;
      border-radius: ${toString t.ui.rounding}px;
    }

    #workspaces button.active {
      color: @base;
      background: @accent;
    }

    #workspaces button.urgent {
      color: @base;
      background: @bad;
    }

    #window {
      color: @subtext;
      padding: 0 12px;
    }

    #clock {
      color: @text;
      font-weight: bold;
    }

    #tray, #pulseaudio, #network, #cpu, #memory, #battery {
      color: @subtext;
      padding: 0 10px;
    }

    #pulseaudio.muted { color: @muted; }
    #battery.warning { color: @warn; }
    #battery.critical { color: @bad; }
    #battery.charging { color: @good; }
  '';
in
{
  programs.waybar = lib.mkIf config.nomarchy.waybar.enable {
    enable = true;
    systemd.enable = true; # started/stopped with graphical-session.target

    settings.mainBar =
      if hasConfigOverride
      then builtins.fromJSON (builtins.readFile configOverride)
      else generatedSettings;

    style =
      if hasStyleOverride
      then builtins.readFile styleOverride
      else generatedStyle;
  };
}