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

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

options = with lib; with types; {
  cascade.local.git-url = mkOption {
    default = null;
    type = nullOr str;
    description = ''
      git URL where cascade sources can be found
    '';
  };
};

config = with lib; {
  #system.activationScripts.cascade-local-source = mkMerge [
  #  (mkIf (config.cascade.local.git-url != null) ''
  #    if [ ! -f /usr/src/cascade-local/.created-by-nixos ];then
  #      mkdir -m 0755 -p /usr/src
  #      # if it's just a symlink, delete it.
  #      if [ -e /usr/src/cascade-local.before-nixos ] ;then
  #        1>&2 echo "there is already a backup at /usr/src/cascade-local.before-nixos"
  #        exit 1
  #      fi

  #      if [ -h /usr/src/cascade-local.before-nixos ];then
  #        rm -v /usr/src/cascade-local.before-nixos
  #      fi
  #      [ -e /usr/src/cascade-local ] && mv /usr/src/cascade-local /usr/src/cascade-local.before-nixos
  #      ${pkgs.git}/bin/git clone ${config.cascade.source.git-url} /usr/src/cascade-local
  #      touch /usr/src/cascade-local/.created-by-nixosa
  #    fi
  #  '')
  #  (mkIf (config.cascade.local.git-url == null) ''
  #    # if it's a symlink, just delete it.
  #    if [ -h /usr/src/cascade-local ];then
  #      rm -v /usr/src/cascade-local
  #    fi

  #    # only cleanup if we actually created /usr/src/cascade-local
  #    if [ -f /usr/src/cascade-local/.created-by-nixos ];then
  #      rm -rf /usr/src/cascade-local && \
  #      [ -e /usr/src/cascade-local.before-nixos ] && mv /usr/src/cascade-local.before-nixos /usr/src/cascade-local
  #    fi
  #    
  #    mkdir -m 0755 -p /usr/src

  #    if [ -h /usr/src/cascade-local.before-nixos ];then
  #      rm -v /usr/src/cascade-local.before-nixos
  #    fi
  #    if [ -e /usr/src/cascade-local ];then
  #      mv /usr/src/cascade-local /usr/src/cascade-local.before-nixos
  #    fi

  #    ln -sfn ${<cascade-local>} /usr/src/cascade-local
  #  '')
  #];
  # no matter what, we always set cascade-local in NIX_PATH to /usr/src/cascade-local
  nix.nixPath = [ "cascade-local=/usr/src/cascade-local" ];
};

}