{ config, lib, ... }: let
	cfg = config.fonts.fontconfig;
	fcConfd = "fontconfig/conf.d";
	fcResources = ./resources/fontconfig;

	extraConfigFile = lib.types.submodule ({ name, ... }: {
		options = {
			enable = lib.mkEnableOption "Whether this font config file should be generated.";
			text = lib.mkOption {
				type = lib.types.nullOr lib.types.lines;
				default = null;
				description = "Verbatim contents of the config file. If this option is null then the 'source' option must be set.";
			};
			source = lib.mkOption {
				type = lib.types.nullOr lib.types.path;
				default = null;
				description = "Config file to source. Alternatively, use the 'text' option instead.";
			};
			label = lib.mkOption {
				type = lib.types.str;
				default = "name";
				description = "Label to use for the name of the config file.";
			};
			priority = lib.mkOption {
				type = lib.types.addCheck lib.types.int (x: x >= 0 && x <= 99);
				default = 90;
				description = ''
					Determines the order in which configs are loaded.
					Must be a value within the range of 0-99, where priority 0 is the highest priority and 99 is the lowest.
				'';
			};
		};
		config = {
			label = lib.mkDefault name;
		};
	});
in {
	options.fonts.fontconfig = {
		_extraConfigFiles = lib.mkOption {
			type = lib.types.attrsOf extraConfigFile;
			default = {};
			description = ''
				Extra font config files that will be added to `~/.config/fontconfig/conf.d/`.
				Files are added as `conf.d/{priority}-{label}.conf`.
			'';
			example = ''
				{
					tamzen = {
						enable = true;
						label = "tamzen-disable-antialiasing";
						text = tamzenFontConfig;  # Pretend this is defined elsewhere
						priority = 90;
					};  # => conf.d/90-tamzen-disable-antialiasing.conf
					commit-mono-options = {
						enable = true;
						source = ./resources/fontconfig/commit-mono.conf;
						priority = 80;
					};  # => conf.d/80-commit-mono-options.conf
				};
			'';
		};
	};

	config = lib.mkIf cfg.enable {
		fonts.fontconfig._extraConfigFiles = {
			tamzen-disable-antialiasing = {
				enable = true;
				text = builtins.readFile ./resources/fontconfig/90-tamzen-disable-anti-aliasing.conf;
				priority = 90;
			};
			commit-mono-options = {
				enable = true;
				source = ./resources/fontconfig/90-commit-mono-options.conf;
				priority = 90;
			};
		};

		xdg.configFile = lib.mapAttrs' (name: config:
			lib.nameValuePair "${fcConfd}/${builtins.toString config.priority}-${config.label}.conf"
			{ inherit (config) text; source = lib.mkIf (config.source != null) config.source; }
		) cfg._extraConfigFiles;
	};
}