.dotfiles/modules/nixos/common/settings.nix

{ self, lib, pkgs, config, outputs, inputs, minimal, ... }:
let
  inherit (config.swarselsystems) mainUser;
  settings = if minimal then { } else {
    environment.etc."nixos/configuration.nix".source = pkgs.writeText "configuration.nix" ''
      assert builtins.trace "This location is not used. The config is found in ${config.swarselsystems.flakePath}!" false;
      { }
    '';

    nix =
      let
        flakeInputs = lib.filterAttrs (_: lib.isType "flake") inputs;
      in
      {
        settings = {
          connect-timeout = 5;
          bash-prompt-prefix = "$SHLVL:\\w ";
          bash-prompt = "$(if [[ $? -gt 0 ]]; then printf \"\"; else printf \"\"; fi)λ ";
          fallback = true;
          min-free = 128000000;
          max-free = 1000000000;
          flake-registry = "";
          auto-optimise-store = true;
          warn-dirty = false;
          max-jobs = 1;
          use-cgroups = lib.mkIf config.swarselsystems.isLinux true;
        };
        gc = {
          automatic = true;
          dates = "weekly";
          options = "--delete-older-than 10d";
        };
        optimise = {
          automatic = true;
          dates = "weekly";
        };
        channel.enable = false;
        registry = rec {
          nixpkgs.flake = inputs.nixpkgs;
          # swarsel.flake = inputs.swarsel;
          swarsel.flake = self;
          n = nixpkgs;
          s = swarsel;
        };
        nixPath = lib.mapAttrsToList (n: _: "${n}=flake:${n}") flakeInputs;
      };

    services.dbus.implementation = "broker";

    systemd.services.nix-daemon = {
      environment.TMPDIR = "/var/tmp";
    };

  };
in
{
  options.swarselmodules.general = lib.mkEnableOption "general nix settings";
  config = lib.mkIf config.swarselmodules.general
    (lib.recursiveUpdate
      {
        sops.secrets.github-api-token = lib.mkIf (!minimal) {
          owner = mainUser;
        };

        nix =
          let
            nix-version = "2_30";
          in
          {
            package = pkgs.nixVersions."nix_${nix-version}";
            settings = {
              experimental-features = [
                "nix-command"
                "flakes"
                "ca-derivations"
                "cgroups"
                "pipe-operators"
              ];
              trusted-users = [ "@wheel" "${config.swarselsystems.mainUser}" ];
            };
            # extraOptions = ''
            #   plugin-files = ${pkgs.dev.nix-plugins}/lib/nix/plugins
            #   extra-builtins-file = ${self + /nix/extra-builtins.nix}
            # '' + lib.optionalString (!minimal) ''
            #   !include ${config.sops.secrets.github-api-token.path}
            # '';
            # extraOptions = ''
            #   plugin-files = ${pkgs.nix-plugins.overrideAttrs (o: {
            #     buildInputs = [config.nix.package pkgs.boost];
            #     patches = o.patches or [];
            #   })}/lib/nix/plugins
            #   extra-builtins-file = ${self + /nix/extra-builtins.nix}
            # '';

            extraOptions =
              let
                nix-plugins = pkgs.nix-plugins.override {
                  nixComponents = pkgs.nixVersions."nixComponents_${nix-version}";
                };
              in
              ''
                plugin-files = ${nix-plugins}/lib/nix/plugins
                extra-builtins-file = ${self + /nix/extra-builtins.nix}
              '' + lib.optionalString (!minimal) ''
                !include ${config.sops.secrets.github-api-token.path}
              '';
          };

        system.stateVersion = lib.mkDefault "23.05";

        nixpkgs = {
          overlays = [
            outputs.overlays.default
            (final: prev:
              let
                additions = final: _: import "${self}/pkgs/config" {
                  inherit self config lib;
                  pkgs = final;
                  homeConfig = config.home-manager.users.${config.swarselsystems.mainUser};
                };
              in
              additions final prev
            )
          ];
          config = {
            allowUnfree = true;
          };
        };

      }
      settings);
}