{ nixpkgs, ... }@inputs:
rec {
  generateNixosSystem = name: {
    system ? "x86_64-linux",
    group ? null,
    modules ? [],
    site
  }: let
    localNixpkgs = nixpkgs.lib.attrByPath [ "nixpkgs-${name}" ] nixpkgs inputs;
  in localNixpkgs.lib.nixosSystem {
    system = system;
    modules = modules ++ [
      ./configuration/common
      ./configuration/proxmox-vm
      ./configuration/proxmox-vm/hardware-configuration.nix
      ./hosts/${name}
    ];
  };

  mapToNixosConfigurations = name: host: generateNixosSystem name host;

  filterUnderscore = hosts: (nixpkgs.lib.filterAttrs (name: host: (builtins.substring 0 1 name) != "_") hosts);

  buildHosts = hosts: builtins.mapAttrs (name: host: host.config.system.build.toplevel) (filterUnderscore hosts);
}