with builtins;
with import (toString ../functions);

{pkgs, config, lib, ...}: {

options = with lib; with types; {
  #cascade.source.enable = mkOption {
  #  default = true;
  #  type = bool;
  #  description = ''
  #    Include cascade source code configured for nixos-rebuild.
  #  '';
  #};
  #cascade.source.git-url = mkOption {
  #  default = "https://gitlab.com/jamesandariese/cascade";
  #  type = str;
  #  description = ''
  #    git URL where cascade sources can be found
  #  '';
  #};
  cascade.source.path = mkOption {
    default = "${<cascade>}";
    type = str;
    description = ''
      where to get cascade source from
    '';
  };
  cascade.source.set-nix-path = mkOption {
    default = true;
    type = bool;
    description = ''
      set cascade=/usr/src/cascade in NIX_PATH if cascade.source.enable is also true.

      if this option or cascade.source.enable are false, this will not be done.
    '';
  };
};

config = with lib; {
  #system.activationScripts.cascade-source = mkMerge [
  #  (mkIf config.cascade.source.enable ''
  #    if [ ! -f /usr/src/cascade/.created-by-nixos ];then
  #      mkdir -m 0755 -p /usr/src /etc/nixos
  #      # if it's just a symlink, delete it.
  #      [ -e /usr/src/cascade ] && mv /usr/src/cascade /usr/src/cascade.before-nixos
  #      ${pkgs.git}/bin/git clone ${config.cascade.source.git-url} /usr/src/cascade
  #      touch /usr/src/cascade/.created-by-nixos
  #    fi
  #  '')
  #  (mkIf (!config.cascade.source.enable) ''
  #    # only cleanup if we actually created /usr/src/cascade
  #    if [ -f /usr/src/cascade/.created-by-nixos ];then
  #      rm -rf /usr/src/cascade && \
  #      [ -e /usr/src/cascade.before-nixos ] && mv /usr/src/cascade.before-nixos /usr/src/cascade
  #    fi
  #  '')
  #];

  nix.nixPath = mkMerge [
    [ "nixpkgs=${import <cascade-local/nixpkgs-path.nix>}" ]
    [ "cascade=${config.cascade.source.path}" ]
    #(mkIf (config.cascade.source.set-nix-path && config.cascade.source.enable) [ "cascade=/usr/src/cascade" ])
    #(mkIf (!(config.cascade.source.set-nix-path && config.cascade.source.enable)) [ "cascade=https://gitlab.com/jamesandariese/cascade/-/archive/main/cascade-main.tar.gz" ])
  ];
};

}