{
  description = "Pterodactyl Wings";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  };

  outputs = { self, nixpkgs }:
  {
    packages."x86_64-linux".pterodactyl-wings = nixpkgs.legacyPackages."x86_64-linux".callPackage ./pkgs/wings.nix { };    
    packages."x86_64-linux".default = self.packages."x86_64-linux".pterodactyl-wings;

    packages."aarch64-linux".pterodactyl-wings = nixpkgs.legacyPackages."aarch64-linux".callPackage ./pkgs/wings.nix { };    
    packages."aarch64-linux".default = self.packages."aarch64-linux".pterodactyl-wings;

    nixosModules.pterodactyl-panel = ./modules/panel.nix;
    nixosModules.pterodactyl-wings = { lib, config, pkgs, ... }:
      with lib;
      let
        configuration = ''
          # managed by NixOS
        '' + "${config.services.wings.configuration}";
      in {
        options.services.wings = {
          enable = mkOption {
            type = types.bool;
            default = false;
          };
          configuration = mkOption {
            type = types.str;
            default = null;
          };
          pkg = mkOption { 
            type = types.package;
            default = self.packages.${pkgs.system}.pterodactyl-wings;
          };
        };

        config = mkIf config.services.wings.enable {
          assertions = [{
            assertion = config.services.wings.configuration != null;
            message = "wings is enabled, configuration must be set.";
          }];

          virtualisation.docker.enable = true;
          environment.etc."pterodactyl/config.yml".text = configuration;
          environment.systemPackages = [ config.services.wings.pkg ];
          systemd.services.wings = {
            enable = config.services.wings.enable;
            description = "Pterodactyl Wings daemon";
            after = [ "docker.service" ];
            partOf = [ "docker.service" ];
            requires = [ "docker.service" ];
            startLimitIntervalSec = 180;
            startLimitBurst = 30;
            serviceConfig = {
              User = "root";
              WorkingDirectory = "/run/wings";
              LimitNOFILE = 4096;
              PIDFile = "/var/run/wings/daemon.pid";
              ExecStart =
                "/bin/sh -c '/usr/bin/env mkdir /run/wings; /usr/bin/env cat /etc/pterodactyl/config.yml > /run/wings/config.yml; ${config.services.wings.pkg}/bin/wings --config /run/wings/config.yml'";
              Restart = "on-failure";
              RestartSec = "5s";
            };
            wantedBy = [ "multi-user.target" ];
          };
        };
      };

    nixosModules.default = self.nixosModules.pterodactyl-wings;
  };
}