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

{
  system.activationScripts.applications.text = let
    appsSrc = config.system.build.applications + /Applications;
    baseDir = "/Applications/Nix Apps";
  in
    pkgs.lib.mkForce ''
      echo 'Setting up /Applications/Nix Apps...' >&2
      appsSrc="${appsSrc}"
      if [ -d "$appsSrc" ]; then
        baseDir="${baseDir}"
        rsyncFlags=(
          --archive
          --checksum
          --chmod=-w
          --copy-unsafe-links
          --delete
          --no-group
          --no-owner
        )
        $DRY_RUN_CMD mkdir -p "$baseDir"
        $DRY_RUN_CMD ${lib.getBin pkgs.rsync}/bin/rsync \
          ''${VERBOSE_ARG:+-v} "''${rsyncFlags[@]}" "$appsSrc/" "$baseDir"
      fi
    '';

  # nix auto garbage collection
  nix.gc = {
    automatic = true;
    interval = { Weekday = 0; Hour = 0; Minute = 0; };
    options = "--delete-older-than 7d";
  };

  # changing this might break
  system.stateVersion = 5;
}