nix-dotfiles/modules/desktop/themes/default.nix

{ pkgs, lib, config, ... }:

with lib;
with lib.my;
let
  cfg = config.modules.desktop.themes;
in {
  options.modules.desktop.themes = with types; {
    active = mkOption {
      type = types.nullOr types.str;
      default = null;
      description = "Name of the theme to apply; see modules/desktop/themes for a list of valid options";
    };

    dark = mkOpt bool false;

    gtkTheme = {
      name = mkOpt str "";
      package = mkPackageOption pkgs "gtk" {};
    };
    kvantumTheme = {
      name = mkOpt str "";
      package = mkPackageOption pkgs "kvantum" {};
    };
    iconTheme = {
      name = mkOpt str "";
      package = mkPackageOption pkgs "icon" {};
    };
    cursorTheme = {
      name = mkOpt str "";
      package = mkPackageOption pkgs "cursor" {};
      size = mkOpt int 24;
    };
    sddmTheme = {
      name = mkOpt str "";
      package = mkPackageOption pkgs "sddm" {};
    };
    plymouthTheme = {
      name = mkOpt str "";
      package = mkPackageOption pkgs "plymouth" {};
    };

    editor = {
      vscode = {
        colorTheme = {
          name = mkOpt str "";
          extension = mkPackageOption pkgs "extension" {};
        };
        iconTheme = {
          name = mkOpt str "";
          extension = mkPackageOption pkgs "extension" {};
        };
      };
    };

    hyprland = {
      source = mkOpt (nullOr str) null;
      extraConfig = mkOpt (nullOr str) null;
    };

    waybar = mkOpt str "";

    wob = {
      borderColor = mkOpt (nullOr str) null;
      backgroundColor = mkOpt (nullOr str) null;
      barColor = mkOpt (nullOr str) null;
    };

    rofi = mkOpt (nullOr path) null;

    wezterm = mkOpt (nullOr str) null;

    nwg-drawer = mkOpt (nullOr str) null;
  };

  config = mkIf (cfg.active != null) {
    programs.dconf.enable = true;
    hm.dconf = {
      enable = true;
      settings."org/gnome/desktop/interface".color-scheme = mkIf cfg.dark "prefer-dark";
      settings."org/gnome/desktop/interface".gtk-theme = cfg.gtkTheme.name;
      settings."org/gnome/desktop/interface".icon-theme = cfg.iconTheme.name;
      settings."org/gnome/desktop/interface".cursor-theme = cfg.cursorTheme.name;
      settings."org/gnome/desktop/interface".cursor-size = cfg.cursorTheme.size;

      settings."org/gnome/shell/extensions/user-theme".name = cfg.gtkTheme.name;
    };

    hm.gtk = {
      enable = true;
      cursorTheme = {
        name = cfg.cursorTheme.name;
        package = cfg.cursorTheme.package;
        size = cfg.cursorTheme.size;
      };
      iconTheme = cfg.iconTheme;
      theme = cfg.gtkTheme;
      gtk3.extraConfig.gtk-application-prefer-dark-theme = mkIf cfg.dark "1";
      gtk4.extraConfig.gtk-application-prefer-dark-theme = mkIf cfg.dark "1";
    };

    hm.qt = {
      enable = true;
      platformTheme.name = "qtct";
      style.name = "kvantum";
    };

    hm.home.pointerCursor = {
      gtk.enable = true;
      x11.enable = true;
      name = cfg.cursorTheme.name;
      package = cfg.cursorTheme.package;
      size = cfg.cursorTheme.size;
    };

    hm.services.dunst.iconTheme = {
      name = cfg.iconTheme.name;
      package = cfg.iconTheme.package;
    };

    hm.programs.vscode = {
      extensions = [
        cfg.editor.vscode.colorTheme.extension
        cfg.editor.vscode.iconTheme.extension
      ];
      userSettings = {
        "workbench.colorTheme" = cfg.editor.vscode.colorTheme.name;
        "workbench.iconTheme" = cfg.editor.vscode.iconTheme.name;
      };
    };

    hm.wayland.windowManager.hyprland = {
      settings.source = mkIf (cfg.hyprland.source != null) [ cfg.hyprland.source ];
      extraConfig = mkIf (cfg.hyprland.extraConfig != null) cfg.hyprland.extraConfig;
    };

    hm.programs.waybar.style = cfg.waybar;

    hm.services.wob.settings."" = {
      border_color = cfg.wob.borderColor;
      background_color = cfg.wob.backgroundColor;
      bar_color = cfg.wob.barColor;
    };

    hm.programs.rofi.theme = cfg.rofi;

    hm.xdg.configFile = let
      iniFmt = pkgs.formats.ini {};
      
      mkQtctConf = version: let
        zeroCount = if version == 5 then 5 else if version == 6 then 10 else builtins.throw "invalid qtct version";
        zeros = builtins.concatStringsSep "," (builtins.genList (_: "0") zeroCount);
        weight = if version == 5 then 50 else if version == 6 then 400 else builtins.throw "invalid qtct version";
      in {
        Appearance = {
          icon_theme = cfg.iconTheme.name;
          standard_dialogs = "xdgdesktopportal";
          style = "kvantum";
        };

        Fonts = with config.modules.desktop.fonts.fonts; {
          # i'm going to go on a rant here
          # this actually SUCKS omg
          # god is dead and The Qt Company killed him
          # (for qt5, font weight is on a different scale where 50 is equivalent to 400 in qt6, even more fun)
          # font weight is set to 400, this is the default weight for every font ever and it will fall back to something else if the font doesn't have a 400 weight (ex. cozette only has a 500 weight)
          # setting the font style name is BAD!! i found it breaks font selection for others that aren't the weight that is given, and it's not required anyway
          # technically this isn't perfect because we are setting the font size in points to the pixel size, but it doesn't matter since we define it in pixels right afterwards. this is a bit annoying but whatever man
          # oh and, because why not, the qt5 font config has less zeros than the qt6 font config. the docs don't say anything about this. i am going to kill myself @The Qt Company
          # yapping over. this is the best we can do for now
          general = ''"${sansSerif.family},${toString sansSerif.size},${toString sansSerif.size},5,${toString weight},${zeros},1"'';
          fixed = ''"${monospace.family},${toString monospace.size},${toString monospace.size},5,${toString weight},${zeros},1"'';
        };
      };
    in {
      # technically could cause issues w KDE if we use that
      # not a concern for now
      "kdeglobals".text = ''
        [Icons]
        Theme=${cfg.iconTheme.name}
      '';

      "Kvantum/${cfg.kvantumTheme.name}".source = "${cfg.kvantumTheme.package}/share/Kvantum/${cfg.kvantumTheme.name}";
      "Kvantum/kvantum.kvconfig".text = ''
        [General]
        theme=${cfg.kvantumTheme.name}
      '';

      "qt5ct/qt5ct.conf".source = iniFmt.generate "qt5ct.conf" (mkQtctConf 5);
      "qt6ct/qt6ct.conf".source = iniFmt.generate "qt6ct.conf" (mkQtctConf 6);
    };
  };
}