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

with lib;
let
  mkFontOption = kind: default: {
    family = mkOption {
      type = types.str;
      default = default.family;
      description = "Family name for ${kind} font profile";
      example = "Fira Code";
    };
    package = mkOption {
      type = types.package;
      default = default.package;
      description = "Package for ${kind} font profile";
      example = "pkgs.fira-code";
    };
    size = mkOption {
      type = types.number;
      default = default.size;
      description = "${kind} font profile size, px";
      example = "11";
    };
  };
  cfg = config.modules.desktop.fonts;
in {
  options.modules.desktop.fonts = {
    enable = mkEnableOption "Enable the font configuration module, containing system fonts";
    baseFonts = mkEnableOption "Add an set of extra base fonts";
    
    fonts = {
      sansSerif = mkFontOption "sansSerif" {
        package = pkgs.my.atkinson-hyperlegible-pro;
        family = "Atkinson Hyperlegible Pro";

        size = 11;
      };
      serif = mkFontOption "serif" {
        package = pkgs.my.atkinson-hyperlegible-pro;
        family = "Atkinson Hyperlegible Pro";

        size = 11;
      };
      monospace = mkFontOption "monospace" {
        package = pkgs.cozette;
        family = "CozetteVector";

        size = 10;
      };
      monospaceBitmap = mkFontOption "bitmap monospace" {
        package = pkgs.cozette;
        family = "Cozette";

        size = 10;
      };
      emoji = mkFontOption "emoji" {
        package = pkgs.twitter-color-emoji;
        family = "Twitter Color Emoji";

        size = 10; # not applicable, but whatever
      };
    };
  };

  config = mkIf cfg.enable {
    fonts = {
      fontDir.enable = true;
      fontconfig.enable = true;
      fontconfig.defaultFonts = {
        sansSerif = [ cfg.fonts.sansSerif.family ];
        serif = [ cfg.fonts.serif.family ];
        monospace = [ cfg.fonts.monospace.family ];
        emoji = [ cfg.fonts.emoji.family ];
      };
      enableGhostscriptFonts = true;
      packages = with pkgs; [  	
        corefonts
        noto-fonts
        noto-fonts-cjk-sans
        liberation_ttf
      ] ++ [
        cfg.fonts.sansSerif.package
        cfg.fonts.serif.package
        cfg.fonts.monospace.package
        cfg.fonts.monospaceBitmap.package
        cfg.fonts.emoji.package
      ];
    } // (mkIf cfg.baseFonts {
      enableDefaultPackages = true;
      packages = with pkgs; [
        fira-code
        fira-code-symbols
        mplus-outline-fonts.githubRelease
        dina-font
        proggyfonts
        atkinson-hyperlegible
        cozette
        twemoji-color-font
        noto-fonts-color-emoji
        noto-fonts-monochrome-emoji
        font-awesome
      ];
    });

    hm.gtk.enable = true;
    hm.gtk.font = with cfg.fonts.sansSerif; { # im great at writing nix, right?
      package = package;
      name = family;

      size = size;
    };

    hm.dconf.settings = {
      "org/gnome/desktop/interface".font-name = with cfg.fonts.sansSerif; "${family} ${toString size}";
      "org/gnome/desktop/interface".document-font-name = with cfg.fonts.serif; "${family} ${toString size}";
      "org/gnome/desktop/interface".monospace-font-name = with cfg.fonts.monospace; "${family} ${toString size}";
    };
  };
}