{
  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    agenix = {
      url = "github:ryantm/agenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = {
    self,
    nixpkgs,
    agenix,
    ...
  }: let
    lib = nixpkgs.lib;
    proj_root = ./../..;
    # TODO: Change respectively to the system or make a nix shell to alias `nix run github:ryantm/agenix -- `
    base_modules = [
      agenix.nixosModule
      {
        age.secrets.s3fs = {
          file = ../../secrets/s3fs.age;
          # mode = "600";  # owner + group only
          # owner = "hungtr";
          # group = "users";
        };
        age.secrets."s3fs.digital-garden" = {
          file = ../../secrets/s3fs.digital-garden.age;
        };
        age.secrets._nhitrl_cred = {
          file = ../../secrets/_nhitrl.age;
        };
        environment.systemPackages = [agenix.defaultPackage.x86_64-linux];
      }
    ];
  in {
    # Windows with NixOS WSL
    nixosConfigurations.Felia = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules =
        base_modules
        ++ [
          ./wsl-configuration.nix
          {
            system.stateVersion = "22.05";
          }
        ];
      specialArgs = {
        # includeHardware = false;
        hostname = "Felia";
        _services.openssh = {
          permitRootLogin = "no";
          enable = true;
        };
      };
    };
    nixosConfigurations.lizzi = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules =
        base_modules
        ++ [
          ./configuration.nix
          {
            system.stateVersion = "22.05";
            mod.tailscale.enable = true;
          }
        ];
      specialArgs = {
        hostname = "lizzi";
        _networking = {
          interfaces.eth1.ipv4.addresses = [
            {
              address = "71.0.0.1";
              prefixLength = 24;
            }
          ];
          firewall = {
            enable = true;
            allowedTCPPorts = [80 443 22];
          };
          useDHCP = false;
          # required so that we get IP address from linode
          interfaces.eth0.useDHCP = true;
        };
        _boot.loader.grub.enable = true;
        _boot.loader.grub.version = 2;
        _services.openssh = {
          permitRootLogin = "no";
          enable = true;
        };
        _services.gitea = {
          enable = true;
          stateDir = "/gitea";
          rootUrl = "https://git.pegasust.com";
          settings = {
            repository = {
              "ENABLE_PUSH_CREATE_USER" = true;
              "ENABLE_PUSH_CREATE_ORG" = true;
            };
          };
        };
        # Highly suspect that thanks to nginx, ipv6 is disabled?
        _services.nginx = {
          enable = true;
          clientMaxBodySize = "100m"; # Allow big file transfers over git :^)
          recommendedGzipSettings = true;
          recommendedOptimisation = true;
          recommendedProxySettings = true;
          recommendedTlsSettings = true;
          virtualHosts."git.pegasust.com" = {
            # Gitea hostname
            sslCertificate = "/var/lib/acme/git.pegasust.com/fullchain.pem";
            sslCertificateKey = "/var/lib/acme/git.pegasust.com/key.pem";
            forceSSL = true; # Runs on port 80 and 443
            locations."/".proxyPass = "http://localhost:3000/"; # Proxy to Gitea
          };
        };
      };
    };
    # Generic machine
    nixosConfigurations.pixi = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules =
        base_modules
        ++ [
          ./configuration.nix
          {
            system.stateVersion = "22.05";
          }
        ];
      specialArgs = {
        hostname = "pixi";
        _networking = {
          # interfaces.eth1.ipv4.addresses = [{
          #   address = "71.0.0.1";
          #   prefixLength = 24;
          # }];
          firewall = {
            enable = false;
            allowedTCPPorts = [80 443 22];
          };
          useDHCP = false;
          # interfaces.eth0.useDHCP = true;
        };
        _boot.loader.grub.enable = true;
        _boot.loader.grub.version = 2;
        _services.openssh = {
          permitRootLogin = "no";
          enable = true;
        };
        _services.gitea = {
          enable = true;
          stateDir = "/gitea";
          rootUrl = "https://git.pegasust.com";
          settings = {
            repository = {
              "ENABLE_PUSH_CREATE_USER" = true;
              "ENABLE_PUSH_CREATE_ORG" = true;
            };
          };
        };
        _services.nginx = {
          enable = true;
          clientMaxBodySize = "100m"; # Allow big file transfers over git :^)
          recommendedGzipSettings = true;
          recommendedOptimisation = true;
          recommendedProxySettings = true;
          recommendedTlsSettings = true;
          virtualHosts."git.pegasust.com" = {
            # Gitea hostname
            sslCertificate = "/var/lib/acme/git.pegasust.com/fullchain.pem";
            sslCertificateKey = "/var/lib/acme/git.pegasust.com/key.pem";
            forceSSL = true; # Runs on port 80 and 443
            locations."/".proxyPass = "http://localhost:3000/"; # Proxy to Gitea
          };
        };
      };
    };
    nixosConfigurations.nyx = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules =
        base_modules
        ++ [
          ./configuration.nix
          {
            system.stateVersion = "22.05";
          }
        ];
      specialArgs = {
        hostname = "nyx";
        _networking = {
          enableIPv6 = false;
          interfaces.eth1.ipv4.addresses = [
            {
              address = "71.0.0.2";
              prefixLength = 24;
            }
          ];
          firewall.enable = true;
          useDHCP = false;
          interfaces.eth0.useDHCP = true;
        };
        _boot.loader.grub.enable = true;
        _boot.loader.grub.version = 2;
        _services.openssh = {
          permitRootLogin = "no";
          enable = true;
        };
      };
    };
    nixosConfigurations.nixos = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules =
        base_modules
        ++ [
          ./configuration.nix
          {
            system.stateVersion = "22.05";
          }
        ];
      specialArgs = {
        hostname = "nixos";
      };
    };
    nixosConfigurations.htran-dev = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules =
        base_modules
        ++ [
          ./configuration.nix
          {
            system.stateVersion = "22.11";
            mod.tailscale.enable = false;
            networking.defaultGateway = {
              address = "10.100.200.1";
              # interface = "ens32";
            };
            networking.interfaces.ens32.ipv4.addresses = [
              {
                address = "10.100.200.230";
                prefixLength = 24;
              }
            ];
          }
        ];
      specialArgs = {
        hostname = "htran-dev";
        _networking = {
          firewall.enable = true;
          useDHCP = false;
          interfaces.eth0.useDHCP = true;
        };
        _boot.loader.grub.enable = true;
        _boot.loader.grub.version = 2;
        _services.openssh = {
          permitRootLogin = "no";
          enable = true;
        };
      };
    };
    nixosConfigurations.bao = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      specialArgs.hostname = "bao";
      modules =
        base_modules
        ++ [
          ./configuration.nix
          ./../../modules/storage.perso.sys.nix
          ./../../modules/kde.sys.nix
          # GPU, sound, networking stuffs
          ./../../modules/pulseaudio.sys.nix
          ./../../modules/opengl.sys.nix
          ./../../modules/nvgpu.sys.nix
          ({
            config,
            pkgs,
            lib,
            ...
          }: {
            mod.tailscale.enable = true;
            # Use UEFI
            boot.loader.systemd-boot.enable = true;

            networking.hostName = "bao"; # Define your hostname.
            # Pick only one of the below networking options.
            # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
            networking.networkmanager.enable = true; # Easiest to use and most distros use this by default.

            time.timeZone = "America/Phoenix";
            # Configure keymap in X11
            services.xserver.layout = "us";
            # services.xserver.xkbOptions = {
            #   "eurosign:e";
            #   "caps:escape" # map caps to escape.
            # };

            # Enable CUPS to print documents.
            # services.printing.enable = true;

            # Enable touchpad support (enabled default in most desktopManager).
            # services.xserver.libinput.enable = true;
            # Just an initial user to get this started lol
            users.users.user = {
              initialPassword = "pw123";
              extraGroups = ["wheel" "networkmanager" "audio"];
              isNormalUser = true;
            };

            # Some programs need SUID wrappers, can be configured further or are
            # started in user sessions.
            # programs.mtr.enable = true;
            # programs.gnupg.agent = {
            #   enable = true;
            #   enableSSHSupport = true;
            # };

            # List services that you want to enable:

            # Enable the OpenSSH daemon.
            services.openssh.enable = true;

            # This value determines the NixOS release from which the default
            # settings for stateful data, like file locations and database versions
            # on your system were taken. It‘s perfectly fine and recommended to leave
            # this value at the release version of the first install of this system.
            # Before changing this value read the documentation for this option
            # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
            system.stateVersion = "22.11"; # Did you read the comment?
          })
        ];
    };
  };
}