{ config, options, lib, ... }:
with lib;
let mkOptionStr = value: mkOption
  { type = types.str;
    default = value; };
in {
  imports = [
    <home-manager/nixos>

    ./desktop
    ./dev
    ./editors
    ./shell
    ./services
    ./themes
  ];

  options = {
    my = {
      # Personal details
      username = mkOptionStr "foo-dogsquared";
      email = mkOptionStr "foo.dogsquared@gmail.com";

      # Convenience aliases
      home = mkOption { type = options.home-manager.users.type.functor.wrapped; };
      user = mkOption { type = types.submodule; };
      packages = mkOption { type = with types; listOf package; };

      # Environment
      env = mkOption {
        type = with types; attrsOf (either (either str path) (listOf (either str path)));
        apply = mapAttrs
          (n: v: if isList v
                 then concatMapStringsSep ":" (x: toString x) v
                 else (toString v));
      };

      alias = mkOption {
        type = with types; nullOr (attrsOf (nullOr (either str path)));
      };

      zsh = {
        rc = mkOption {
          type = types.lines;
          default = "";
          description = ''
            Zsh lines to be written to $XDG_CONFIG_HOME/zsh/extra.zshrc and
            sourced by $XDG_CONFIG_HOME/zsh/.zshrc
          '';
        };
        env = mkOption {
          type = types.lines;
          default = "";
          description = ''
            Zsh lines to be written to $XDG_CONFIG_HOME/zsh/extra.zshenv and
            sourced by $XDG_CONFIG_HOME/zsh/.zshenv
          '';
        };
      };
    };
  };

  config = {
    # Convenience aliases
    home-manager.users.${config.my.username} = mkAliasDefinitions options.my.home;
    home-manager.useGlobalPkgs = true;
    users.users.${config.my.username} = mkAliasDefinitions options.my.user;
    my.user.packages = config.my.packages;

    # PATH should always start with its old value
    my.env.PATH = [ <config/bin> "$PATH" ];

    # Put the configured custom environment variables (config.my.env) into initialization phase.
    environment.extraInit = 
      let exportLines = mapAttrsToList (key: value: "export ${key}=\"${value}\"") config.my.env;
      in ''
      export XAUTHORITY=/tmp/XAUTHORITY
      [ -e ~/.Xauthority ] && mv -f ~/.Xauthority "$XAUTHORITY"

       ${concatStringsSep "\n" exportLines}
      '';

    my.home.xdg.configFile = {
      "zsh/.zshrc".text =
        let aliasLines = mapAttrsToList (key: value: "alias ${key}=\"${value}\"") config.my.alias;
        in ''
          # This file is autogenerated, do not edit it!
          ${concatStringsSep "\n" aliasLines}
          ${config.my.zsh.rc}
        '';
      "zsh/.zshenv".text = ''
        # This file is autogenerated, please do not edit it!
        ${config.my.zsh.env}
      '';
    };
  };
}