# XDG stands for "Cross-Desktop Group", with X used to mean "cross".
# It's a bunch of specifications from freedesktop.org intended to standardize desktops and
# other GUI applications on various systems (primarily Unix-like) to be interoperable:
#   https://www.freedesktop.org/wiki/Specifications/
{ config, pkgs, ... }: {
  home.packages = with pkgs; [
    xdg-utils # provides cli tools such as `xdg-mime` `xdg-open`
    xdg-user-dirs
  ];

  xdg = {
    enable = true;
    cacheHome = config.home.homeDirectory + "/.cache";

    # manage $XDG_CONFIG_HOME/mimeapps.list
    # xdg search all desktop entries from $XDG_DATA_DIRS, check it by command:
    #  echo $XDG_DATA_DIRS
    # the system-level desktop entries can be list by command:
    #   ls -l /run/current-system/sw/share/applications/
    # the user-level desktop entries can be list by command(user ryan):
    #  ls /etc/profiles/per-user/ryan/share/applications/

    userDirs = {
      enable = true;
      createDirectories = false;
      documents = config.home.homeDirectory + "/doc";
      music = config.home.homeDirectory + "/doc/music";
      desktop = config.home.homeDirectory + "/tmp";
      download = config.home.homeDirectory + "/tmp";
      videos = config.home.homeDirectory + "/tmp";
      pictures = config.home.homeDirectory + "/tmp";
      # templates = config.home.homeDirectory + "/tmp";
      # publicShare = config.home.homeDirectory + "/tmp";
      extraConfig = {
        XDG_SCREENSHOTS_DIR = config.home.homeDirectory + "/tmp/Screenshots";
      };
    };
  };

  # 使用map函数循环 conf 变量，动态的生成 home.file.<user>.config.${i}
  xdg.configFile = builtins.listToAttrs
    (builtins.map
      (name: {
        inherit name;
        value = {
          source = config.home-libs.mkOutOfStoreSymlink "modules/home/xdg/conf/${name}";
        };
      })
      (builtins.attrNames (builtins.readDir ./conf))
    );
}