{
  description = "Evie's machine configurations";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    stylix = {
      url = "github:danth/stylix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { nixpkgs, home-manager, stylix, ... }:
    let
      default = {
        hostName = "Atlas";
        user = "xenia";
        system = "x86_64-linux";
        group = "users";
        shell = "zsh";
        systemModules = [ ./system/hyprland.nix ];
        serviceModules = [ ];
        homeModules = [
          ./home/default.nix
          ./home/emacs.nix
          ./home/accounts/default.nix
          ./home/hyprland/default.nix
          ./home/nyxt/default.nix
        ];
        stateVersion = "23.05";
      };
      systemConfig = { hostName ? default.hostName, user ? default.user
        , system ? default.system, group ? default.group, shell ? default.shell
        , systemModules ? default.systemModules
        , serviceModules ? default.serviceModules
        , homeModules ? default.homeModules, stateVersion ? default.stateVersion
        }:
        let specialArgs = { inherit hostName user; };
        in nixpkgs.lib.nixosSystem {
          inherit system specialArgs;
          modules = [
            ./hosts/${hostName}/configuration.nix
            ./hosts/${hostName}/hardware-configuration.nix
            home-manager.nixosModules.home-manager
            stylix.nixosModules.stylix
            ({ config, lib, pkgs, ... }: {
              boot.loader = {
                systemd-boot.enable = true;
                efi.canTouchEfiVariables = true;
              };
              programs = {
                ${shell}.enable = true;
                nano = {
                  enable = true;
                  syntaxHighlight = true;
                  nanorc = ''
                    set nowrap
                    set tabstospaces
                    set tabsize 2
                  '';
                };
              };
              nix = {
                enable = true;
                settings = {
                  experimental-features = [ "nix-command" "flakes" ];
                  auto-optimise-store = true;
                };
                channel.enable = true;
                registry = {
                  nixpkgs.to = {
                    type = "path";
                    path = pkgs.path;
                  };
                };
                nixPath = [ "nixpkgs=${nixpkgs}" ];
                gc = {
                  automatic = true;
                  options = "--delete-older-than 7d";
                };
                optimise.automatic = true;
                extraOptions = ''
                  keep-outputs = true
                  keep-derivations = true
                  min-free = ${toString (100 * 1024 * 1024)}
                  max-free = ${toString (1024 * 1024 * 1024)}
                '';
              };
              nixpkgs.config.allowUnfreePredicate = pkg:
                builtins.elem (lib.getName pkg) [
                  "steam"
                  "steam-original"
                  "steam-run"
                  "nomachine-client"
                ];
              system = { inherit stateVersion; };
              networking = {
                inherit hostName;
                firewall.enable = true;
              };
              stylix = {
                autoEnable = false;
                targets = {
                  chromium.enable = true;
                  console.enable = true;
                };
                image = ./wallpapers/space.png;
                base16Scheme =
                  "${pkgs.base16-schemes}/share/themes/catppuccin-mocha.yaml";
                override = {
                  scheme =
                    "Catppuccin Mocha, using fg and bg colours from emacs modus-vivdendi-tinted";
                  base00 = "0d0e1c";
                  base01 = "1d2235";
                  base04 = "c6daff";
                  base05 = "ffffff";
                };
                polarity = "dark";
                opacity = {
                  popups = 0.5;
                  terminal = 0.8;
                };
                fonts = rec {
                  sizes.terminal = 12;
                  emoji = {
                    name = "Noto Color Emoji";
                    package = pkgs.noto-fonts-emoji;
                  };
                  monospace = {
                    name = "FiraCode Nerd Font";
                    package =
                      (pkgs.nerdfonts.override { fonts = [ "FiraCode" ]; });
                  };
                  sansSerif = {
                    name = "Fira Sans";
                    package = pkgs.fira;
                  };
                  serif = sansSerif;
                };
                homeManagerIntegration.followSystem = true;
              };
              fonts = {
                packages = with pkgs; [
                  fira
                  fira-mono
                  fira-code
                  (nerdfonts.override {
                    fonts = [ "FiraCode" "NerdFontsSymbolsOnly" ];
                  })
                  emacs-all-the-icons-fonts
                  weather-icons
                  noto-fonts
                  noto-fonts-cjk
                  noto-fonts-emoji
                  liberation_ttf
                ];
                fontconfig.enable = true;
              };
              users.users = let
                authorizedKeys.keys = [
                  "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINI1dWlS16Keil0MGPWmMsBzx8F9ylfz+fRwxUr8/tZ/ ion"
                  "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIANfkqd5lPTsSPU3SRYnAa1UjCYDmDeBTyzq5McmWlm6 xenia@Vanguard"
                  "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJ/ZSSCN5sqrA+tdoIZr5EUm5DRuBV4dQ7J+QBEtUwUU xenia@Northstar"
                ];
              in {
                root.openssh = { inherit authorizedKeys; };
                ${user} = {
                  inherit group;
                  isNormalUser = true;
                  description = "Evie Litherland-Smith";
                  extraGroups =
                    [ "networkmanager" "wheel" "video" "input" "uinput" ];
                  shell = pkgs.${shell};
                  initialHashedPassword =
                    "$y$j9T$tHIPQt09Kf3KH2eIRze3g/$2mwSlcq27DTGvHNPJ5EP9/1CfL3bXP0F6oS/Vuffmn3";
                  openssh = { inherit authorizedKeys; };
                };
              };
              home-manager = {
                extraSpecialArgs = { inherit hostName; };
                useGlobalPkgs = true;
                useUserPackages = true;
                users = {
                  root = {
                    imports = [ ./home/default.nix ];
                    home = {
                      inherit stateVersion;
                      username = "root";
                      homeDirectory = "/root";
                    };
                    programs.home-manager.enable = true;
                  };
                  ${user} = let
                    username = user;
                    homeDirectory = "/home/${user}";
                  in {
                    imports =
                      [ ./hosts/${hostName}/home.nix ./home/default.nix ]
                      ++ homeModules;
                    home = { inherit username homeDirectory stateVersion; };
                    programs.home-manager.enable = true;
                    xdg.userDirs = {
                      enable = true;
                      createDirectories = true;
                      extraConfig = {
                        XDG_PROJECTS_DIR = "${homeDirectory}/Projects";
                      };
                    };
                  };
                };
              };
            })
          ] ++ systemModules ++ serviceModules;
        };
    in {
      nixosConfigurations = {

        ## Server

        Legion = let
          hostName = "Legion";
          user = "xenia";
          system = "x86_64-linux";
        in systemConfig {
          inherit hostName user system;
          systemModules = [ ./system/default.nix ./system/autoupgrade.nix ];
          serviceModules = [
            ./services/adguardhome.nix
            ./services/caddy.nix
            ./services/gitea.nix
            ./services/grafana.nix
            ./services/ntfy-sh.nix
            ./services/sshd.nix
            ./services/syncthing.nix
          ];
          homeModules = [ ./home/default.nix ];
        };

        ## Laptops

        Northstar = let
          hostName = "Northstar";
          user = "xenia";
          system = "x86_64-linux";
        in systemConfig { inherit hostName user system; };

        Ronin = let
          hostName = "Ronin";
          user = "elitherl";
          system = "x86_64-linux";
        in systemConfig { inherit hostName user system; };

        ## Desktops

        Scorch = let
          hostName = "Scorch";
          user = "elitherl";
          system = "x86_64-linux";
        in systemConfig {
          inherit hostName user system;
          systemModules = default.systemModules ++ [ ./system/autoupgrade.nix ];
        };

        Vanguard = let
          hostName = "Vanguard";
          user = "xenia";
          system = "x86_64-linux";
        in systemConfig {
          inherit hostName user system;
          systemModules = default.systemModules
            ++ [ ./system/autoupgrade.nix ./system/steam.nix ];
          homeModules = default.homeModules ++ [ ./home/games/default.nix ];
        };

      };
    };
}