{
  description = "Pazpi's systems";

  inputs = {

    # NixOS related inputs
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";

    nixos-hardware.url = "github:NixOS/nixos-hardware/master";

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

    colmena = {
      url = "github:zhaofengli/colmena";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    home-manager = {
      url = "github:nix-community/home-manager/release-24.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      nixpkgs-unstable,
      agenix,
      colmena,
      home-manager,
      ...
    }@inputs:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; };

      myModule = {
        imports = [ ./modules ];
      };

      proxmoxModule = {
        imports = [
          "${nixpkgs}/nixos/modules/virtualisation/proxmox-lxc.nix"
          ./modules/virtualisation/proxmox.nix
        ];
      };

    in
    {

      # used with: `nix fmt`
      formatter.${system} = pkgs.nixfmt-rfc-style;

      nixosConfigurations.deadbeef = nixpkgs.lib.nixosSystem {
        inherit system;
        specialArgs = {
          inherit inputs;
        };
        modules = [
          myModule
          ./hosts/deadbeef
        ];
      };

      nixosConfigurations.arr = nixpkgs.lib.nixosSystem {
        inherit system;
        specialArgs = {
          inherit inputs;
        };

        modules = [
          myModule
          proxmoxModule
          ./hosts/arr
        ];
      };

      colmena =
        {
          meta = {
            description = "pazpi.top infrastructure";
            nixpkgs = import nixpkgs { inherit system; };
          };
        }
        // builtins.mapAttrs (name: value: {
          nixpkgs.system = value.config.nixpkgs.system;
          imports = value._module.args.modules;
          deployment = {
            targetHost = "${name}.nixos.org";
          };
        }) self.nixosConfigurations;

      # colmena = {
      #   meta = {
      #     nixpkgs = pkgs;
      #     specialArgs = {
      #       inherit inputs;
      #     };
      #   };

      #   defaults = {
      #     imports = [
      #       "${nixpkgs}/nixos/modules/virtualisation/proxmox-lxc.nix"
      #       ./modules
      #       ./modules/virtualisation/proxmox.nix
      #     ];
      #   };

      #   # childnixos = {
      #   #   deployment = {
      #   #     targetHost = "10.233.244.63";
      #   #     targetPort = 22;
      #   #     targetUser = "root";
      #   #   };

      #   #   imports = [ ./lxc-nix/configuration.nix ];
      #   # };

      #   arr = {
      #     deployment = {
      #       targetHost = "192.168.1.189";
      #       targetPort = 22;
      #       targetUser = "pazpi";
      #     };

      #     time.timeZone = "Europe/Rome";
      #     imports = [ ./hosts/arr ];
      #   };

      # };

      devShells.${system}.default = pkgs.mkShell {
        buildInputs = with pkgs; [
          agenix.packages.${system}.agenix
          colmena.packages.${system}.colmena
        ];
      };

    };

}