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# This function creates a NixOS system based on our VM setup for a
# particular architecture.
{
  self,
  nixpkgs,
  inputs,
  overlays,
}:

systemName:
{
  system,
  user,
  darwin ? false,
}:

let
  # The config files for this system.
  machineConfig = ../machines/${systemName};
  userOSConfig = ../users/${user}/${if darwin then "darwin" else "nixos"}.nix;
  userHMConfig = ../users/${user}/home-manager.nix;

  # NixOS vs nix-darwin functions
  systemFunc = if darwin then inputs.darwin.lib.darwinSystem else nixpkgs.lib.nixosSystem;
  home-manager =
    if darwin then inputs.home-manager.darwinModules else inputs.home-manager.nixosModules;
in
systemFunc rec {
  inherit system;

  modules =
    [
      # Allow unfree packages.
      { nixpkgs.config.allowUnfree = true; }

      # Add overlays
      { nixpkgs.overlays = overlays; }

      machineConfig
      userOSConfig
      home-manager.home-manager

      inputs.agenix.nixosModules.default
    ]
    ++ nixpkgs.lib.optional (!darwin) [
      (import ../modules/fcuny-net.nix)
      inputs.disko.nixosModules.disko
    ]
    ++ [
      {
        home-manager.useGlobalPkgs = true;
        home-manager.useUserPackages = true;
        home-manager.sharedModules = [
          inputs.agenix.homeManagerModules.default
        ];
        home-manager.users.${user} = import userHMConfig {
          inherit
            self
            inputs
            darwin
            systemName
            ;
        };
        home-manager.extraSpecialArgs = {
          inherit self inputs;
          configPath = "${self}/configs/users/${user}";
        };
      }

      # We expose some extra arguments so that our modules can parameterize
      # better based on these values.
      {
        config._module.args = {
          currentSystem = system;
          currentSystemName = systemName;
          currentSystemUser = user;
          inputs = inputs;
        };
      }
    ];
}