# System Module
# Provides: Common system configuration options used by other modules
{
  config,
  lib,
  pkgs,
  ...
}:

let
  cfg = config.myModules.system;
in
{
  options.myModules.system = {
    mainUser = lib.mkOption {
      type = lib.types.str;
      default = "ashie";
      description = "Main user account for running services";
    };

    autoUpdate = {
      enable = lib.mkEnableOption "automatic system updates";
      flake = lib.mkOption {
        type = lib.types.str;
        default = "git+ssh://forgejo@git.ashisgreat.xyz:2222/ashie/nixos-vps.git";
        description = "Flake URI to update from";
      };
      dates = lib.mkOption {
        type = lib.types.str;
        default = "04:00";
        description = "Schedule for updates (systemd.timer format)";
      };
      allowReboot = lib.mkOption {
        type = lib.types.bool;
        default = false;
        description = "Allow automatic reboots after updates";
      };
    };

    maintenance = {
      gc = {
        enable = lib.mkOption {
          type = lib.types.bool;
          default = true;
          description = "Enable automatic garbage collection";
        };
        dates = lib.mkOption {
          type = lib.types.str;
          default = "weekly";
          description = "Schedule for GC (systemd.timer format)";
        };
        olderThan = lib.mkOption {
          type = lib.types.str;
          default = "7d";
          description = "Delete generations older than this";
        };
      };
      optimise = {
        enable = lib.mkOption {
          type = lib.types.bool;
          default = true;
          description = "Enable automatic Nix store optimisation";
        };
      };
    };
  };

  config = {
    # Automatic Updates
    system.autoUpgrade = lib.mkIf cfg.autoUpdate.enable {
      enable = true;
      inherit (cfg.autoUpdate) dates allowReboot flake;
      flags = [
        "--update-input"
        "nixpkgs"
        "-L" # show logs
      ];
    };

    # Nix Maintenance
    nix.gc = lib.mkIf cfg.maintenance.gc.enable {
      automatic = true;
      dates = cfg.maintenance.gc.dates;
      options = "--delete-older-than ${cfg.maintenance.gc.olderThan}";
    };
    nix.optimise.automatic = cfg.maintenance.optimise.enable;
  };
}