{
  config,
  lib,
  pkgs,
  ...
}:
let
  cfg = config.programs.aria2;

  formatLine =
    n: v:
    let
      formatValue = v: if builtins.isBool v then (if v then "true" else "false") else toString v;
    in
    "${n}=${formatValue v}";
in
{
  meta.maintainers = [ lib.hm.maintainers.justinlovinger ];

  options.programs.aria2 = {
    enable = lib.mkEnableOption "aria2";

    package = lib.mkPackageOption pkgs "aria2" { nullable = true; };

    settings = lib.mkOption {
      type =
        with lib.types;
        attrsOf (oneOf [
          bool
          float
          int
          str
        ]);
      default = { };
      description = ''
        Options to add to {file}`aria2.conf` file.
        See
        {manpage}`aria2c(1)`
        for options.
      '';
      example = lib.literalExpression ''
        {
          listen-port = 60000;
          dht-listen-port = 60000;
          seed-ratio = 1.0;
          max-upload-limit = "50K";
          ftp-pasv = true;
        }
      '';
    };

    extraConfig = lib.mkOption {
      type = lib.types.lines;
      default = "";
      description = ''
        Extra lines added to {file}`aria2.conf` file.
      '';
    };
  };

  config = lib.mkIf cfg.enable {
    home.packages = lib.mkIf (cfg.package != null) [ cfg.package ];

    xdg.configFile."aria2/aria2.conf".text = lib.concatStringsSep "\n" (
      [ ]
      ++ lib.mapAttrsToList formatLine cfg.settings
      ++ lib.optional (cfg.extraConfig != "") cfg.extraConfig
    );
  };
}