{
  description = "PVV System flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05-small";
    unstable.url = "github:NixOS/nixpkgs/nixos-unstable-small";

    sops-nix.url = "github:Mic92/sops-nix";
    sops-nix.inputs.nixpkgs.follows = "nixpkgs";

    pvv-calendar-bot.url = "git+https://git.pvv.ntnu.no/Projects/calendar-bot.git";
    pvv-calendar-bot.inputs.nixpkgs.follows = "nixpkgs";

    matrix-next.url = "github:dali99/nixos-matrix-modules";

    grzegorz.url = "github:Programvareverkstedet/grzegorz";
    grzegorz.inputs.nixpkgs.follows = "unstable";
    grzegorz-clients.url = "github:Programvareverkstedet/grzegorz-clients";
    grzegorz-clients.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, matrix-next, pvv-calendar-bot, unstable, sops-nix, ... }@inputs:
  let
    nixlib = nixpkgs.lib;
    systems = [
      "x86_64-linux"
      "aarch64-linux"
      "aarch64-darwin"
    ];
    forAllSystems = f: nixlib.genAttrs systems (system: f system);
    allMachines = nixlib.mapAttrsToList (name: _: name) self.nixosConfigurations;
    importantMachines = [
      "bekkalokk"
      "bicep"
      "brzeczyszczykiewicz"
      "georg"
      "ildkule"
    ];
  in {
    nixosConfigurations = let
      nixosConfig = nixpkgs: name: config: nixpkgs.lib.nixosSystem (nixpkgs.lib.recursiveUpdate
        rec {
          system = "x86_64-linux";
          specialArgs = {
            inherit unstable inputs;
            values = import ./values.nix;
          };

          modules = [
            ./hosts/${name}/configuration.nix
            sops-nix.nixosModules.sops
          ];

          pkgs = import nixpkgs {
            inherit system;
            overlays = [
              (final: prev: {
                mx-puppet-discord = prev.mx-puppet-discord.override { nodejs_14 = final.nodejs_18; };
              })
              pvv-calendar-bot.overlays.${system}.default
            ];
          };
        }
        config
      );

      stableNixosConfig = nixosConfig nixpkgs;
      unstableNixosConfig = nixosConfig unstable;
    in {
      bicep = stableNixosConfig "bicep" {
        modules = [
          ./hosts/bicep/configuration.nix
          sops-nix.nixosModules.sops

          matrix-next.nixosModules.default
          pvv-calendar-bot.nixosModules.default
        ];
      };
      bekkalokk = stableNixosConfig "bekkalokk" { };
      ildkule = stableNixosConfig "ildkule" { };
      #ildkule-unstable = unstableNixosConfig "ildkule" { };
      shark = stableNixosConfig "shark" { };

      brzeczyszczykiewicz = stableNixosConfig "brzeczyszczykiewicz" {
        modules = [
          ./hosts/brzeczyszczykiewicz/configuration.nix
          sops-nix.nixosModules.sops

          inputs.grzegorz.nixosModules.grzegorz-kiosk
          inputs.grzegorz-clients.nixosModules.grzegorz-webui
        ];
      };
      georg = stableNixosConfig "georg" {
        modules = [
          ./hosts/georg/configuration.nix
          sops-nix.nixosModules.sops

          inputs.grzegorz.nixosModules.grzegorz-kiosk
          inputs.grzegorz-clients.nixosModules.grzegorz-webui
        ];
      };

      grevling = stableNixosConfig "grevling" {
        modules = [
          ./hosts/grevling/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };

      tuba = stableNixosConfig "grevling" {
        modules = [
          ./hosts/tuba/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };
    };

    devShells = forAllSystems (system: {
      default = nixpkgs.legacyPackages.${system}.callPackage ./shell.nix { };
    });

    packages = {
      "x86_64-linux" = let
        pkgs = nixpkgs.legacyPackages."x86_64-linux";
      in rec {
        default = important-machines;
        important-machines = pkgs.linkFarm "important-machines"
          (nixlib.getAttrs importantMachines self.packages.x86_64-linux);
        all-machines = pkgs.linkFarm "all-machines"
          (nixlib.getAttrs allMachines self.packages.x86_64-linux);
      } // nixlib.genAttrs allMachines
        (machine: self.nixosConfigurations.${machine}.config.system.build.toplevel);
    };
  };
}