{ lib, config, ... }:

# Minimal Jovian compatibility layer for NixOS stable (25.05)
# Defines only the Jovian options used by roles/desktop/steamos.nix
# No actual implementation - just option definitions to prevent evaluation errors
# REMOVE THIS FILE when all systems are on NixOS 25.11+ or unstable

with lib;

let
  nixosVersion = config.system.nixos.release;
  isCompatibleVersion = versionOlder nixosVersion "25.11";
in
{
  options.jovian = {
    steam = {
      enable = mkEnableOption "Steam (jovian-compat stub)";

      autoStart = mkOption {
        type = types.bool;
        default = false;
        description = "Auto-start Steam (jovian-compat stub)";
      };

      user = mkOption {
        type = types.str;
        default = "user";
        description = "Steam user (jovian-compat stub)";
      };

      desktopSession = mkOption {
        type = types.nullOr types.str;
        default = null;
        description = "Desktop session (jovian-compat stub)";
      };
    };

    decky-loader = {
      enable = mkEnableOption "Decky Loader (jovian-compat stub)";
    };
  };

  config = mkMerge [
    {
      assertions = [
        {
          assertion = isCompatibleVersion;
          message = ''
            The Jovian compatibility shim (roles/jovian-compat.nix) is only needed for NixOS 25.05 and earlier.
            You are running NixOS ${nixosVersion}.
            Please remove 'roles/jovian-compat.nix' from your flake.nix nixosModules list.
          '';
        }
      ];
    }
    # No config implementation - these options do nothing on stable systems
    # steamos role is only enabled on nix-deck which uses unstable anyway
    (mkIf config.jovian.steam.enable {
      warnings = [
        "Jovian is enabled but you're using the compatibility stub. This won't work correctly. Use NixOS unstable for Jovian support."
      ];
    })
  ];
}