{ config, pkgs, lib, ... }:
with builtins // lib;
let
  cfg = config.kobo;
  ini = pkgs.formats.ini {};
in {
  options.kobo = {
    enable = mkEnableOption "main configurations";

    path = mkOption {
      type = types.str;
      readOnly = true;
      internal = true;
      default = ".kobo/Kobo";
    };

    devicePath = mkOption {
      type = types.str;
      readOnly = true;
      internal = true;
      default = "/mnt/onboard/${cfg.path}";
    };

    file = mkOption {
      default = {};
      type = types.attrsOf (types.submodule (pkgs.callPackage ../lib/file-type.nix {}));
      apply = filterAttrs (_: v: v.enable);
    };

    _allFiles = mkOption {
      type = types.package;
      readOnly = true;
      internal = true;
      default = pkgs.symlinkJoin {
        name = "kobo-files";
        paths = mapAttrsToList (v: v._package) cfg.file;
      };
    };

    conf = mkOption {
      type = ini.type;
      default = {};
      description = "https://wiki.mobileread.com/wiki/Kobo_Configuration_Options";
    };
  };

  config = mkMerge [
    {
      kobo = {
        conf = {
          FeatureSettings.ExcludeSyncFolders = ''(\.(?!kobo|adobe).+|([^.][^/]*/)+\..+)'';
          ApplicationPreferences = {
            SideloadedMode = true;
            QuickTourShown = true;
          };
        };

        file = mkIf (cfg.conf != {}) {
          "Kobo eReader.conf".text = generators.toINI {} cfg.conf;
        };
      };
    }
    (mkIf cfg.enable {
      koboroot.include = singleton (pkgs.linkFarm [{
        name = cfg.devicePath;
        path = cfg._allFiles;
      }]);
    })
  ];
}