{ pkgs, ... }:
{
  # "https://cache.mjallen.dev"
  # "cache.mjallen.dev-1:IzFmKCd8/gggI6lcCXsW65qQwiCLGFFN9t9s2iw7Lvc="
  services.nix-serve = {
    enable = true;
    secretKeyFile = "/etc/nix/cache-priv-key.pem";
    port = 5000;  # Choose your preferred port
    openFirewall = true;
  };
  
  # Improved systemd service with better error handling
  systemd.services.nix-rebuild-cache = {
    description = "Rebuild all NixOS configurations for cache";
    serviceConfig = {
      Type = "oneshot";
      User = "root";
      WorkingDirectory = "/etc/nixos";  # Update this path
      StandardOutput = "journal+console";
      StandardError = "journal+console";
      Restart = "no";
      # Increase timeout for large builds
      TimeoutStartSec = "2h";
    };
    path = with pkgs; [
      nix
      git
      coreutils
      gnugrep
      gnused
    ];
    script = ''
      #!/usr/bin/env bash
      set -euo pipefail
      
      # Pull latest changes if in a git repo
      if [ -d .git ]; then
        git pull || echo "Warning: Could not pull latest changes"
      fi
      
      # Run the build-all script
      echo "Starting build of all systems at $(date)"
      if nix run .#build-all; then
        echo "All systems built successfully at $(date)"
      else
        echo "Some systems failed to build at $(date)"
        exit 1
      fi
    '';
    # # Send an email on failure (optional)
    # startPost = ''
    #   if [ $SERVICE_RESULT != "success" ]; then
    #     ${pkgs.mailutils}/bin/mail -s "NixOS cache rebuild failed" your-email@example.com <<EOF
    #   The nix-rebuild-cache service failed at $(date).
    #   Please check the logs with: journalctl -u nix-rebuild-cache
    #   EOF
    #   fi
    # '';
  };

  systemd.timers.nix-rebuild-cache = {
    description = "Timer for rebuilding NixOS configurations cache";
    wantedBy = [ "timers.target" ];
    timerConfig = {
      OnCalendar = "weekly";  # Or your preferred schedule
      Persistent = true;
      RandomizedDelaySec = "1h";  # Spread load
    };
  };
}