{

  description = "A flake for building my infra";

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

    darwinConfigurations = {
      blechkasten = inputs.darwin.lib.darwinSystem rec {
        system = "aarch64-darwin";
        pkgs = import inputs.nixpkgsDarwin {
          inherit system;
          config.allowUnfree = true;
          overlays = overlays ++ [(import ./pkgs/darwin)];
        };
        specialArgs = {
          currentSystem = system;
          inherit inputs;
        };
        modules = [
          inputs.mac-app-util.darwinModules.default
          ./machines/blechkasten/darwin-configuration.nix
        ];
      };
    };

    colmena = {
      meta = rec {
        allowApplyAll = false;

        nixpkgs = import inputs.nixpkgs {
          system   = "x86_64-linux";
          overlays = overlays;
        };

        specialArgs = {
          inherit inputs;
          currentSystem = nixpkgs.system;
        };
      };

      defaults = { lib, ... }: {
        imports = [ ./configurations/common ];

        system.nixos.versionSuffix = ".${lib.substring 0 8 (inputs.nixpkgs.sourceInfo.lastModifiedDate or inputs.nixpkgs.sourceInfo.lastModified or "19700101")}.${inputs.nixpkgs.sourceInfo.shortRev or "dirty"}";
        system.nixos.revision       = lib.mkIf (inputs.nixpkgs.sourceInfo ? rev) inputs.nixpkgs.sourceInfo.rev;
      };

      briefkasten      = import ./machines/briefkasten/configuration.nix;

      trabbi           = import ./machines/trabbi/configuration.nix;
      wanderduene      = import ./machines/wanderduene/configuration.nix;
      wanderduene-old  = import ./machines/wanderduene-old/configuration.nix;
    };

    nixosConfigurations = (import (inputs.colmena + "/src/nix/hive/eval.nix") {
      rawFlake = inputs.self;
      colmenaOptions = import (inputs.colmena + "/src/nix/hive/options.nix");
      colmenaModules = import (inputs.colmena + "/src/nix/hive/modules.nix");
    }).nodes;

    overlays = [
      (import ./pkgs/overlay.nix)

      (final: prev: {
        dns      = inputs.dns-nix;
        unstable = inputs.nixpkgsUnstable.legacyPackages.${prev.system};
      })

      inputs.colmena.overlay

      inputs.stagit.overlay

      inputs.gpx-map.overlay
      inputs.mobile-coverage-map.overlay

      inputs.sdm2mqtt.overlay
      inputs.solax2mqtt.overlay
      inputs.lacrosse2mqtt.overlay
      inputs.departures2mqtt.overlay
      inputs.mqtt-webui.overlay

      inputs.ctucx-things.overlay
      inputs.ctucx-gallery.overlay
      inputs.ctucx-website.overlay

      inputs.dnsmasq-lease-overview.overlay
      inputs.flauschehorn-sexy.overlay
      inputs.travelynx2fedi.overlay
    ];

  };

  inputs = {
    nixpkgs = {
      type  = "github";
      owner = "NixOS";
      repo  = "nixpkgs";
      ref   = "nixos-23.11";
    };

    nixpkgsDarwin = {
      type  = "github";
      owner = "NixOS";
      repo  = "nixpkgs";
      ref   = "nixpkgs-23.11-darwin";
    };

    nixpkgsUnstable = {
      type  = "github";
      owner = "NixOS";
      repo  = "nixpkgs";
      ref   = "nixpkgs-unstable";
    };

    nixos-hardware = {
      type  = "github";
      owner = "NixOS";
      repo  = "nixos-hardware";
      ref   = "master";
    };

    home-manager = {
      type  = "github";
      owner = "nix-community";
      repo  = "home-manager";
      ref   = "release-23.11";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    darwin = {
      type  = "github";
      owner = "lnl7";
      repo  = "nix-darwin";
      ref   = "master";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    mac-app-util = {
      type  = "github";
      owner = "hraban";
      repo  = "mac-app-util";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    nix-std = {
      type  = "github";
      owner = "chessai";
      repo  = "nix-std";
      ref   = "master";
    };

    agenix = {
      type  = "github";
      owner = "ryantm";
      repo  = "agenix";
      ref   = "main";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    colmena = {
      type  = "github";
      owner = "zhaofengli";
      repo  = "colmena";
      ref   = "main";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    simple-nixos-mailserver = {
      type  = "gitlab";
      owner = "simple-nixos-mailserver";
      repo  = "nixos-mailserver";
      ref   = "nixos-23.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    flake-utils = {
      type  = "github";
      owner = "numtide";
      repo  = "flake-utils";
      ref   = "main";
    };

    impermanence = {
      type  = "github";
      owner = "nix-community";
      repo  = "impermanence";
      ref   = "master";
    };


    dns-nix = {
      type  = "git";
      url   = "https://git.ctu.cx/dns.nix";
      ref   = "master";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    stagit = {
      type  = "git";
      url   = "https://git.ctu.cx/stagit";
      ref   = "main";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    sdm2mqtt = {
      type  = "git";
      url   = "https://git.ctu.cx/sdm2mqtt";
      ref   = "main";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    solax2mqtt = {
      type  = "git";
      url   = "https://git.ctu.cx/solax2mqtt";
      ref   = "main";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    lacrosse2mqtt = {
      type  = "git";
      url   = "https://git.ctu.cx/lacrosse2mqtt";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    departures2mqtt = {
      type  = "git";
      url   = "https://git.ctu.cx/departures2mqtt";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    mqtt-webui = {
      type  = "git";
      url   = "https://git.ctu.cx/mqtt-webui";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    ctucx-website = {
      type  = "git";
      url   = "https://git.ctu.cx/website";
      ref   = "main";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    ctucx-things = {
      type  = "git";
      url   = "https://git.ctu.cx/ctucx.things";
      ref   = "main";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    ctucx-gallery = {
      type  = "git";
      url   = "https://git.ctu.cx/gallery";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    flauschehorn-sexy = {
      type  = "git";
      url   = "https://git.ctu.cx/flauschehorn.sexy";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    mobile-coverage-map = {
      type  = "git";
      url   = "https://git.ctu.cx/mobile-coverage-map";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    gpx-map = {
      type  = "git";
      url   = "https://git.ctu.cx/gpx-map";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    dnsmasq-lease-overview = {
      type  = "git";
      url   = "https://git.ctu.cx/dnsmasq-lease-overview";
      ref   = "master";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    travelynx2fedi = {
      type  = "git";
      url   = "https://git.ctu.cx/travelynx2fedi";
      ref   = "main";
      inputs.nixpkgs.follows     = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

  };

}