{ lib, config, ... }:

# Compatibility shim to provide services.logind.settings for NixOS 25.05
# This allows Jovian-NixOS to work with stable NixOS
# REMOVE THIS FILE when upgrading to NixOS 25.11 or later

with lib;

let
  nixosVersion = config.system.nixos.release;
  isCompatibleVersion = versionOlder nixosVersion "25.11";
in
{
  options.services.logind.settings = mkOption {
    type = types.attrsOf (types.attrsOf types.anything);
    default = {};
    description = "systemd-logind configuration. See logind.conf(5) for available options.";
  };

  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 ${nixosVersion}.
            Please remove 'roles/jovian-compat.nix' from your flake.nix imports.
          '';
        }
      ];
    }
    (mkIf (config.services.logind.settings != {}) {
      # Convert the settings to extraConfig format for older NixOS
      services.logind.extraConfig = let
        mkSection = section: settings:
          "[${section}]\n" +
          (concatStringsSep "\n" (mapAttrsToList (k: v: "${k}=${toString v}") settings));
      in
        concatStringsSep "\n\n" (mapAttrsToList mkSection config.services.logind.settings);
    })
  ];
}