{
    description = "Unified System Configuration";

    inputs = {

        srvcs.url = "./services";

        pckgs.url = "./packages";

        prgms.url = "./programs";

        diskoConfig.url = "./disko";

        impermanenceConfig.url = "./impermanence";

    };

    outputs = { self, ... }@inputs: {

        nixosModule = { config, lib, pkgs, core_inputs, ... }: {
            imports = [ 
                ./configuration
                ./configuration/${core_inputs.host}/hardware-configuration.nix
                inputs.diskoConfig.module
                inputs.impermanenceConfig.module
                inputs.srvcs.module
                inputs.pckgs.module
                inputs.prgms.module
                ./first_boot
            ];

            options = {
                sysconfig.opts = {
                    host = lib.options.mkOption {
                        type = lib.types.str;
                        default = null;
                    };
                    username = lib.options.mkOption {
                        type = lib.types.str;
                        default = "nathan";
                    };
                    devices = {
                        main = lib.options.mkOption {
                            type = lib.types.str;
                            default = null;
                        };
                        bonus = lib.options.mkOption {
                            type = lib.types.attrsOf lib.types.str;
                            default = null;
                        };
                    };
                };
            };

            config = {

                assertions = [
                    {
                        assertion = (config.sysconfig.opts.host != null);
                        message = "host cannot be null";
                    }

                    {
                        assertion = (config.sysconfig.opts.devices.main != null);
                        message = "devices.main cannot be null";
                    }
                ];
                
                networking.hostName = lib.mkDefault config.sysconfig.opts.host;

                #users.users.${config.sysconfig.opts.username} = {

                #};
            };
        };

    };

}