{ self
, utils
, nixpkgs
, nixpkgs-unstable
, nixos-generators
, sops-nix
, microvm
, ...
} @inputs:

# filter i686-liux from defaultSystem to run nix flake check successfully
let filter_system = name: if name == utils.lib.system.i686-linux then false else true;
in (utils.lib.eachSystem (builtins.filter filter_system utils.lib.defaultSystems) ( system:
  let
    pkgs-unstable = nixpkgs-unstable.legacyPackages."${system}";
    pkgs = nixpkgs.legacyPackages."${system}";

    vmMicroVMOverwrites = hostname: options: {
      microvm = {
        mem = pkgs.lib.mkForce 4096;
        hypervisor = pkgs.lib.mkForce "qemu";
        socket = pkgs.lib.mkForce null;
        shares = pkgs.lib.mkForce ([
          {
            tag = "ro-store";
            source = "/nix/store";
            mountPoint = "/nix/.ro-store";
          }
        ] ++ pkgs.lib.optionals (options.varPath != "") [
          {
            source = "${options.varPath}";
            securityModel = "mapped";
            mountPoint = "/var";
            tag = "var";
          }
        ]);
        interfaces = pkgs.lib.mkIf (!options.withNetworking) (pkgs.lib.mkForce [{
          type = "user";
          id = "eth0";
          mac = "02:23:de:ad:be:ef";
        }]);
      };

      fileSystems = {
        "/".fsType = pkgs.lib.mkForce "tmpfs";

        # prometheus uses a memory mapped file which doesnt seem supported by 9p shares
        # therefore we mount a tmpfs inside the datadir
        "/var/lib/prometheus2/data" = pkgs.lib.mkIf (hostname == "overwatch" && options.varPath != "") (pkgs.lib.mkForce {
          fsType = pkgs.lib.mkForce "tmpfs";
        });
      };

      boot.isContainer = pkgs.lib.mkForce false;
      services.timesyncd.enable = false;
      users.users.root.password = "";
      services.getty.helpLine = ''
        Log in as "root" with an empty password.
        Use "reboot" to shut qemu down.
      '';
    };

    vmDiskoOverwrites = {
      boot.initrd = {
        secrets = pkgs.lib.mkForce {};
        network.ssh.enable = pkgs.lib.mkForce false;
      };

      malobeo.disks.enable = pkgs.lib.mkForce false;
      networking.hostId = "a3c3101f";
    };

    vmSopsOverwrites = host: {
      sops.defaultSopsFile = pkgs.lib.mkForce ./machines/${host}/dummy.yaml;

      environment.etc = {
        devHostKey = {
          source = ./machines/secrets/devkey_ed25519;
          mode = "0600";
        };
      };

      services.openssh.hostKeys = [{
        path = "/etc/devHostKey";
        type = "ed25519";
      }];
    };

    buildVM = host: networking: sopsDummy: disableDisko: varPath: (self.nixosConfigurations.${host}.extendModules {
        modules = [
          (vmMicroVMOverwrites host { withNetworking = networking; varPath = "${varPath}"; })
          (if sopsDummy then (vmSopsOverwrites host) else {})
          (if disableDisko then vmDiskoOverwrites else {})
        ] ++ pkgs.lib.optionals (! self.nixosConfigurations.${host}.config ? microvm) [
          microvm.nixosModules.microvm
        ];
      }).config.microvm.declaredRunner;
  in
  {
    devShells.default =
    let
      sops = sops-nix.packages."${pkgs.system}";
      microvmpkg = microvm.packages."${pkgs.system}";
      installed = builtins.attrNames self.legacyPackages."${pkgs.system}".scripts;
    in
    pkgs.mkShell {
      sopsPGPKeyDirs = [
        "./machines/secrets/keys/hosts"
        "./machines/secrets/keys/users"
      ];
    
      nativeBuildInputs = [
        sops.ssh-to-pgp
        sops.sops-import-keys-hook
        sops.sops-init-gpg-key
        pkgs.sops
        pkgs.age
        pkgs.python310Packages.grip
        pkgs.mdbook
        microvmpkg.microvm
      ];

      packages = builtins.map (pkgName: self.legacyPackages."${pkgs.system}".scripts.${pkgName}) installed;
      shellHook = ''echo "Available scripts: ${builtins.concatStringsSep " " installed}"'';
    };

    legacyPackages = {
      scripts.remote-install = pkgs.writeShellScriptBin "remote-install" (builtins.readFile ./scripts/remote-install-encrypt.sh);
      scripts.boot-unlock = pkgs.writeShellScriptBin "boot-unlock" (builtins.readFile ./scripts/unlock-boot.sh);
      scripts.run-vm = self.packages.${system}.run-vm;
    };

    vmBuilder = buildVM;

    packages = {
      docs = pkgs.stdenv.mkDerivation {
        name = "malobeo-docs";
        phases = [ "buildPhase" ];
        buildInputs = [ pkgs.mdbook ];
      
        inputs = pkgs.lib.sourceFilesBySuffices ./doc/. [ ".md" ".toml" ];
      
        buildPhase = ''
          dest=$out/share/doc
          mkdir -p $dest
          cp -r --no-preserve=all $inputs/* ./
          mdbook build
          ls
          cp -r ./book/* $dest
        '';
      };

      run-vm = pkgs.writeShellScriptBin "run-vm" ''
        usage() {
            echo "Usage: run-vm <hostname> [--networking] [--dummy-secrets] [--no-disko]"
            echo "ATTENTION: This script must be run from the flakes root directory"
            echo "--networking setup interfaces. requires root and hostbridge enabled on the host"
            echo "--dummy-secrets run vm with dummy sops secrets"
            echo "--no-disko disable disko and initrd secrets. needed for real hosts like fanny"
            echo "--var path to directory that should be shared as /var. may require root otherwise some systemd units fail within vm. if dir is empty vm will populate"
            exit 1
        }
        
        # check at least one arg was given
        if [ "$#" -lt 1 ]; then
            usage
        fi
        
        HOSTNAME=$1
        
        # Optionale Argumente
        NETWORK=false
        DUMMY_SECRETS=false
        NO_DISKO=false
        VAR_PATH=""
        
        # check argws
        shift
        while [[ "$#" -gt 0 ]]; do
            case $1 in
                --networking) NETWORK=true ;;
                --dummy-secrets) DUMMY_SECRETS=true ;;
                --no-disko) NO_DISKO=true ;;
                --var) 
                  if [[ -n "$2" && ! "$2" =~ ^- ]]; then
                      VAR_PATH="$2"
                      shift
                  else
                      echo "Error: --var requires a non-empty string argument."
                      usage
                  fi
                  ;;
                *) echo "Unknown argument: $1"; usage ;;
            esac
            shift
        done
        echo "starting host $HOSTNAME"
        echo "enable networking: $NETWORK"
        echo "deploy dummy secrets: $DUMMY_SECRETS"
        echo "disable disko and initrd secrets: $NO_DISKO"
        if [ -n "$VAR_PATH" ]; then
          echo "sharing var directory: $VAR_PATH"
        fi
        
        ${pkgs.nix}/bin/nix run --show-trace --impure --expr "((builtins.getFlake \"$(pwd)\").vmBuilder.x86_64-linux \"$HOSTNAME\" $NETWORK $DUMMY_SECRETS $NO_DISKO \"$VAR_PATH\")"
      '';
    };

    apps = {
      docs = {
        type = "app";
        program = builtins.toString (pkgs.writeShellScript "docs" ''
          ${pkgs.xdg-utils}/bin/xdg-open "${self.packages.${system}.docs}/share/doc/index.html"
        '');
      };


      docsDev = {
        type = "app";
        program = builtins.toString (pkgs.writeShellScript "docs" ''
          echo "needs to run from infrastuctre root folder"
          ${pkgs.mdbook}/bin/mdbook serve --open ./doc
        '');
      };

      run-vm = {
        type = "app";
        program = "${self.packages.${system}.run-vm}/bin/run-vm";
      };
    };

  })) // {
    nixosConfigurations = import ./machines/configuration.nix (inputs // {
      inherit inputs;
      self = self;
    });

    nixosModules.malobeo = {
      host.imports = [ ./machines/durruti/host_config.nix ];
      microvm.imports = [ ./machines/modules/malobeo/microvm_host.nix ];
      vpn.imports = [ ./machines/modules/malobeo/wireguard.nix ];
      initssh.imports = [ ./machines/modules/malobeo/initssh.nix ];
      disko.imports = [ ./machines/modules/disko ];
    };

    hydraJobs = nixpkgs.lib.mapAttrs (_: nixpkgs.lib.hydraJob) (
      let
        getBuildEntry = name: nixosSystem:
          if (nixpkgs.lib.hasPrefix "sdImage" name) then
              nixosSystem.config.system.build.sdImage
          else
            nixosSystem.config.system.build.toplevel;
      in
      nixpkgs.lib.mapAttrs getBuildEntry self.nixosConfigurations

      );
}