{
  description = "Evie's machine configurations";

  nixConfig = {
    extra-substituters = ["https://nix.xenia.me.uk"];
    extra-trusted-public-keys = ["nix.xenia.me.uk:tlgwOaG5KMLjQUk2YaErS8mAG69ZCr3PaHXZYi+Y5eI="];
  };

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
    home-manager = {
      url = "github:nix-community/home-manager/release-23.11";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    iosevka-custom.url = "git+https://git.xenia.me.uk/pixelifytica/iosevka.git";
    base16.url = "github:SenchoPens/base16.nix";
    tt-schemes = {
      url = "github:tinted-theming/schemes";
      flake = false;
    };
  };

  outputs = {
    nixpkgs,
    home-manager,
    iosevka-custom,
    base16,
    tt-schemes,
    ...
  }: let
    systemConfig = {
      hostName ? "Atlas",
      user ? "pixelifytica",
      system ? "x86_64-linux",
      stateVersion ? "23.05",
      systemModules ? [],
      homeModules ? [],
    }: let
      defaultUserShell = "zsh";
      specialArgs = {
        inherit hostName user;
        accentColour = "base07"; # catppuccin lavender
        catppuccinVariant = "Mocha";
        fonts = with import nixpkgs {inherit system;};
        with iosevka-custom.outputs; rec {
          sizes = {
            applications = 14;
            desktop = 12;
            popups = 12;
            terminal = 14;
          };
          serif = sansSerif;
          sansSerif = {
            name = names."iosevka-custom-aile";
            package = packages.${system}."iosevka-custom-aile";
          };
          monospace = {
            name = names."iosevka-custom-nerdfont";
            package = packages.${system}."iosevka-custom-nerdfont";
          };
          emoji = {
            name = "Noto Color Emoji";
            package = noto-fonts-emoji;
          };
        };
      };
    in
      nixpkgs.lib.nixosSystem {
        inherit system specialArgs;
        modules =
          [
            home-manager.nixosModules.home-manager
            base16.nixosModule
            ./hosts/${hostName}/configuration.nix
            ./hosts/${hostName}/hardware-configuration.nix
            ./system/default.nix
            ({
              config,
              lib,
              pkgs,
              catppuccinVariant ? "Mocha",
              ...
            }: {
              scheme = "${tt-schemes}/base16/catppuccin-${lib.strings.toLower catppuccinVariant}.yaml";
              nix = {
                enable = true;
                package = pkgs.nixVersions.unstable;
                settings = {
                  cores = 0;
                  max-jobs = "auto";
                  trusted-users = ["root" user];
                  experimental-features = ["nix-command" "flakes"];
                  auto-optimise-store = true;
                };
                channel.enable = true;
                nixPath = ["nixpkgs=${pkgs.path}"];
                registry.nixpkgs.flake = nixpkgs;
                gc = {
                  automatic = true;
                  options = "--delete-older-than 7d";
                };
                optimise.automatic = true;
                extraOptions = ''
                  keep-outputs = false
                  keep-derivations = false
                  min-free = ${toString (100 * 1024 * 1024)}
                  max-free = ${toString (1024 * 1024 * 1024)}
                '';
              };
              nixpkgs.config.allowUnfree = true;
              networking = {inherit hostName;};
              programs.${defaultUserShell}.enable = true;
              system = {inherit stateVersion;};
              users = {
                defaultUserShell = pkgs.${defaultUserShell};
                users = let
                  authorizedKeys.keys = [
                    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINI1dWlS16Keil0MGPWmMsBzx8F9ylfz+fRwxUr8/tZ/ ion"
                    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDOcgeR3hh23aTiXnyC37xdP8oXfTZbbjgWzkUyxhT9P root@Vanguard"
                    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIANfkqd5lPTsSPU3SRYnAa1UjCYDmDeBTyzq5McmWlm6 xenia@Vanguard"
                    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJ/ZSSCN5sqrA+tdoIZr5EUm5DRuBV4dQ7J+QBEtUwUU xenia@Northstar"
                  ];
                in {
                  root.openssh = {inherit authorizedKeys;};
                  ${user} = {
                    group = "users";
                    isNormalUser = true;
                    description = "Evie Litherland-Smith";
                    extraGroups = ["networkmanager" "wheel" "video" "input" "uinput"];
                    initialHashedPassword = "$y$j9T$tHIPQt09Kf3KH2eIRze3g/$2mwSlcq27DTGvHNPJ5EP9/1CfL3bXP0F6oS/Vuffmn3";
                    openssh = {inherit authorizedKeys;};
                  };
                };
              };
              home-manager = {
                extraSpecialArgs = {inherit (config) scheme;} // specialArgs;
                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;
      };
  in {
    nixosConfigurations = {
      ## Server

      Legion = systemConfig {
        hostName = "Legion";
        systemModules = [
          ./services/caddy.nix
          ./services/forgejo.nix
          ./services/grafana.nix
          ./services/minecraft.nix
          ./services/nix-serve.nix
          ./services/radicale.nix
          ./services/sshd.nix
          ./services/syncthing.nix
        ];
        homeModules = [./home/default.nix];
      };

      ## Personal

      Northstar = systemConfig {
        hostName = "Northstar";
        systemModules = [
          ./system/laptop.nix
          ./system/sway.nix
        ];
        homeModules = [
          ./home/sway/default.nix
          ./home/email/work.nix
        ];
      };

      Vanguard = systemConfig {
        hostName = "Vanguard";
        systemModules = [
          ./system/desktop.nix
          ./system/games.nix
          ./system/sway.nix
        ];
        homeModules = [
          ./home/sway/default.nix
          ./home/email/work.nix
        ];
      };

      ## Work

      Ronin = systemConfig {
        hostName = "Ronin";
        user = "elitherl";
        systemModules = [
          ./system/laptop.nix
          ./system/sway.nix
        ];
        homeModules = [
          ./home/sway/default.nix
          ./home/email/work.nix
        ];
      };

      Scorch = systemConfig {
        hostName = "Scorch";
        user = "elitherl";
        systemModules = [
          ./system/desktop.nix
          ./system/sway.nix
        ];
        homeModules = [
          ./home/sway/default.nix
          ./home/email/work.nix
        ];
      };
    };
  };
}