{
  description = "flake for matt-nixos";

  inputs = {

    #####################################################
    #                   Desktop                         #
    #####################################################

    # nixpgs
    desktop-nixpkgs = {
      url = "github:NixOS/nixpkgs/staging-next";
    };

    # Chaotic-nix
    desktop-chaotic = {
      url = "github:chaotic-cx/nyx/nyxpkgs-unstable";
    };

    # Home Manager
    desktop-home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "desktop-nixpkgs";
    };

    # Impermenance
    desktop-impermanence = {
      url = "github:nix-community/impermanence";
    };

    # Lanzaboote
    desktop-lanzaboote = {
      url = "github:nix-community/lanzaboote/v0.4.2";
      inputs.nixpkgs.follows = "desktop-nixpkgs";
    };

    # Nix hardware
    desktop-nixos-hardware = {
      url = "github:NixOS/nixos-hardware/master";
    };

    # Sops-nix
    desktop-sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "desktop-nixpkgs";
    };

    # steam rom manager
    desktop-steam-rom-manager = {
      url = "github:mjallen18/nix-steam-rom-manager";
      inputs.nixpkgs.follows = "desktop-nixpkgs";
      inputs.home-manager.follows = "desktop-home-manager";
    };

    #####################################################
    #                     NAS                           #
    #####################################################

    # nixpgs
    nas-nixpkgs = {
      # url = "github:NixOS/nixpkgs/nixos-24.11";
      url = "github:NixOS/nixpkgs/nixos-unstable";
    };

    nas-nixpkgs-stable = {
      url = "github:NixOS/nixpkgs/nixos-24.11";
    };

    # Authentik
    nas-authentik-nix = {
      url = "github:nix-community/authentik-nix";
      inputs.nixpkgs.follows = "nas-nixpkgs";
    };

    # cosmic launcher
    nas-cosmic = {
      url = "github:lilyinstarlight/nixos-cosmic";
      inputs.nixpkgs.follows = "nas-nixpkgs-stable";
    };

    # crowdsec
    nas-crowdsec = {
      url = "git+https://codeberg.org/kampka/nix-flake-crowdsec.git";
      inputs.nixpkgs.follows = "nas-nixpkgs";
    };

    # Home Manager
    nas-home-manager = {
      # url = "github:nix-community/home-manager/release-24.11";
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nas-nixpkgs";
    };

    # Impermenance
    nas-impermanence = {
      url = "github:nix-community/impermanence";
    };

    # Lanzaboote
    nas-lanzaboote = {
      url = "github:nix-community/lanzaboote/v0.4.2";
      inputs.nixpkgs.follows = "nas-nixpkgs";
    };

    # Nix hardware
    nas-nixos-hardware = {
      url = "github:NixOS/nixos-hardware/master";
    };

    # Sops-nix
    nas-sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "nas-nixpkgs";
    };

    #####################################################
    #                     Pi5                           #
    #####################################################

    # nixpgs
    Pi5-nixpkgs = {
      url = "github:NixOS/nixpkgs/nixos-24.05";
    };

    # Home Manager
    Pi5-home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "Pi5-nixpkgs";
    };

    # Impermenance
    Pi5-impermanence = {
      url = "github:nix-community/impermanence";
    };

    # Nix hardware
    Pi5-nixos-hardware = {
      url = "github:NixOS/nixos-hardware/master";
    };

    # Sops-nix
    Pi5-sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "Pi5-nixpkgs";
    };

    nixos-raspberrypi.url = "github:nvmd/nixos-raspberrypi";

    #####################################################
    #                  Steamdeck                        #
    #####################################################

    # nixpgs
    steamdeck-nixpkgs = {
      url = "github:NixOS/nixpkgs/nixos-unstable";
    };

    # Joviain for steamdeck
    steamdeck-jovian = {
      url = "github:Jovian-Experiments/Jovian-NixOS";
      inputs.nixpkgs.follows = "steamdeck-nixpkgs";
    };

    # Chaotic-nix
    steamdeck-chaotic = {
      url = "github:chaotic-cx/nyx/nyxpkgs-unstable";
    };

    # Impermenance
    steamdeck-impermanence = {
      url = "github:nix-community/impermanence";
    };

    # Home Manager
    steamdeck-home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "steamdeck-nixpkgs";
    };

    # Lanzaboote
    steamdeck-lanzaboote = {
      url = "github:nix-community/lanzaboote/v0.4.2";
      inputs.nixpkgs.follows = "steamdeck-nixpkgs";
    };

    # Sops-nix
    steamdeck-sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "steamdeck-nixpkgs";
    };

    # Nix hardware
    steamdeck-nixos-hardware = {
      url = "github:NixOS/nixos-hardware/master";
    };

    # steam rom manager
    steamdeck-steam-rom-manager = {
      url = "github:mjallen18/nix-steam-rom-manager";
      inputs.nixpkgs.follows = "steamdeck-nixpkgs";
      inputs.home-manager.follows = "steamdeck-home-manager";
    };

    #####################################################
    #                   MacBook                         #
    #####################################################

    #Apple
    nix-darwin = {
      url = "github:LnL7/nix-darwin";
      inputs.nixpkgs.follows = "desktop-nixpkgs";
    };

    #####################################################
    #                    Common                         #
    #####################################################

    nixpkgs-unstable = {
      url = "github:NixOS/nixpkgs/nixos-unstable";
    };

    nixpkgs-stable = {
      url = "github:NixOS/nixpkgs/nixos-24.11";
    };
  };

  outputs =
    {
      self,

      # Desktop
      desktop-nixpkgs,
      desktop-chaotic,
      desktop-home-manager,
      desktop-impermanence,
      desktop-lanzaboote,
      desktop-nixos-hardware,
      desktop-sops-nix,
      desktop-steam-rom-manager,

      # NAS
      nas-nixpkgs,
      nas-nixpkgs-stable,
      nas-authentik-nix,
      nas-cosmic,
      nas-crowdsec,
      nas-home-manager,
      nas-impermanence,
      nas-lanzaboote,
      nas-nixos-hardware,
      nas-sops-nix,

      # Pi5
      Pi5-nixpkgs,
      Pi5-home-manager,
      Pi5-impermanence,
      Pi5-nixos-hardware,
      Pi5-sops-nix,
      nixos-raspberrypi,

      # Steamdeck
      steamdeck-nixpkgs,
      steamdeck-chaotic,
      steamdeck-home-manager,
      steamdeck-impermanence,
      steamdeck-jovian,
      steamdeck-lanzaboote,
      steamdeck-nixos-hardware,
      steamdeck-sops-nix,
      steamdeck-steam-rom-manager,

      # MacBook
      nix-darwin,

      # Common
      nixpkgs-unstable,
      nixpkgs-stable,
    }@inputs:
    let
      inherit (self) outputs;
    in
    {
      overlays = import ./overlays { inherit inputs; };

      nixosConfigurations = {
        # Desktop
        "matt-nixos" = desktop-nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs outputs;
          };
          modules = [
            desktop-impermanence.nixosModules.impermanence
            desktop-lanzaboote.nixosModules.lanzaboote
            ./hosts/desktop/configuration.nix
            ./share/impermanence
            desktop-chaotic.nixosModules.default
            desktop-home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users.matt =
                { ... }:
                {
                  imports = [
                    ./hosts/desktop/home.nix
                    desktop-steam-rom-manager.homeManagerModules.default
                    desktop-sops-nix.homeManagerModules.sops
                  ];
                };
              home-manager.users.root =
                { ... }:
                {
                  imports = [
                    ./share/root-user
                    desktop-sops-nix.homeManagerModules.sops
                  ];
                };
              home-manager.backupFileExtension = "backup";
            }

            desktop-nixos-hardware.nixosModules.common-cpu-amd
            desktop-nixos-hardware.nixosModules.common-gpu-amd
            desktop-nixos-hardware.nixosModules.common-hidpi
            desktop-nixos-hardware.nixosModules.common-pc

            desktop-sops-nix.nixosModules.sops
          ];
        };

        # NAS
        "jallen-nas" = nas-nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs outputs;
          };
          modules = [
            nas-impermanence.nixosModules.impermanence
            nas-lanzaboote.nixosModules.lanzaboote
            nas-cosmic.nixosModules.default
            ./hosts/nas/configuration.nix
            ./hosts/nas/impermanence.nix
            nas-home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = false;
              home-manager.useUserPackages = true;
              home-manager.users.admin =
                { ... }:
                {
                  imports = [
                    ./hosts/nas/home.nix
                    nas-sops-nix.homeManagerModules.sops
                  ];
                };
              home-manager.users.root =
                { ... }:
                {
                  imports = [
                    ./share/root-user
                    nas-sops-nix.homeManagerModules.sops
                  ];
                };
              home-manager.backupFileExtension = "backup";
            }

            nas-authentik-nix.nixosModules.default

            nas-sops-nix.nixosModules.sops

            nas-crowdsec.nixosModules.crowdsec
            nas-crowdsec.nixosModules.crowdsec-firewall-bouncer

            (
              { ... }:
              {
                nixpkgs.overlays = [ nas-crowdsec.overlays.default ];
              }
            )

            nas-nixos-hardware.nixosModules.common-pc
            nas-nixos-hardware.nixosModules.common-cpu-amd
            nas-nixos-hardware.nixosModules.common-hidpi
          ];
        };

        # Pi5
        "pi5" = nixos-raspberrypi.lib.nixosSystem {
          specialArgs = inputs;
          modules = [
            Pi5-impermanence.nixosModules.impermanence
            ./hosts/pi5/configuration.nix
            {
              # Hardware specific configuration, see section below for a more complete 
              # list of modules
              imports = with nixos-raspberrypi.nixosModules; [
                raspberry-pi-5.base
                raspberry-pi-5.display-vc4
                raspberry-pi-5.bluetooth
              ];
            }

            ({ config, pkgs, lib, ... }:
            let
              kernelBundle = pkgs.linuxAndFirmware.v6_6_31;
            in {
              boot = {
                loader.raspberryPi.firmwarePackage = kernelBundle.raspberrypifw;
                kernelPackages = kernelBundle.linuxPackages_rpi5;
              };
              nixpkgs.overlays = lib.mkAfter [
                (self: super: {
                  # This is used in (modulesPath + "/hardware/all-firmware.nix") when at least 
                  # enableRedistributableFirmware is enabled
                  # I know no easier way to override this package
                  inherit (kernelBundle) raspberrypiWirelessFirmware;
                  # Some derivations want to use it as an input,
                  # e.g. raspberrypi-dtbs, omxplayer, sd-image-* modules
                  inherit (kernelBundle) raspberrypifw;
                })
              ];
              networking.hostName = "pi5";

              system.nixos.tags = let
                cfg = config.boot.loader.raspberryPi;
              in [
                "raspberry-pi-${cfg.variant}"
                cfg.bootloader
                config.boot.kernelPackages.kernel.version
              ];
            })

            # ...

          ];
        };
        # "pi5" = Pi5-nixpkgs.lib.nixosSystem {
        #   system = "aarch64-linux";
        #   modules = [
        #     Pi5-nixos-hardware.nixosModules.raspberry-pi-4
        #     Pi5-impermanence.nixosModules.impermanence
        #     ./hosts/pi5/configuration.nix
        #     Pi5-sops-nix.nixosModules.sops
            

        #     Pi5-home-manager.nixosModules.home-manager
        #     {
        #       home-manager.useGlobalPkgs = true;
        #       home-manager.useUserPackages = true;
        #       home-manager.users.matt = 
        #         { ... }:
        #         {
        #           imports = [
        #             ./hosts/pi5/home.nix
        #             Pi5-sops-nix.homeManagerModules.sops
        #           ];
        #         };
        #     }
        #   ];
        # };

        "steamdeck" = steamdeck-nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs outputs;
          };
          modules = [
            steamdeck-impermanence.nixosModules.impermanence
            steamdeck-lanzaboote.nixosModules.lanzaboote
            ./hosts/deck/configuration.nix
            ./share/impermanence
            steamdeck-home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users.deck =
                { ... }:
                {
                  imports = [
                    ./hosts/deck/home.nix
                    steamdeck-steam-rom-manager.homeManagerModules.default
                  ];
                };
              home-manager.backupFileExtension = "backup";
            }

            steamdeck-nixos-hardware.nixosModules.common-cpu-amd
            steamdeck-nixos-hardware.nixosModules.common-gpu-amd
            steamdeck-nixos-hardware.nixosModules.common-hidpi
            steamdeck-nixos-hardware.nixosModules.common-pc

            steamdeck-sops-nix.nixosModules.sops

            steamdeck-jovian.nixosModules.jovian

            steamdeck-chaotic.nixosModules.default
          ];
        };

        # home assistant
        # "jallen-hass" = nixpkgs-unstable.lib.nixosSystem {
        #   system = "x86_64-linux";
        #   modules = [
        #     impermanence.nixosModules.impermanence
        #     ./hosts/homeassistant/configuration.nix
        #     sops-nix.nixosModules.sops

        #     home-manager.nixosModules.home-manager
        #     {
        #       home-manager.useGlobalPkgs = true;
        #       home-manager.useUserPackages = true;
        #       home-manager.users.hass-admin = import ./hosts/homeassistant/home.nix;
        #     }
        #   ];
        # };
      };

      darwinConfigurations = {
        "MacBook-Pro" = nix-darwin.lib.darwinSystem {
          system = "aarch64-darwin";
          modules = [
            ./hosts/mac/configuration.nix
            desktop-home-manager.darwinModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users.mattjallen = import ./hosts/mac/home.nix;
            }
          ];
        };
      };

      # Improved build-all app
      apps.x86_64-linux.build-all =
        let
          pkgs = nas-nixpkgs.legacyPackages.x86_64-linux;
        in
        {
          type = "app";
          program = toString (
            pkgs.writeShellScript "build-all" ''
              #!/usr/bin/env bash
              set -euo pipefail

              # Get the list of system names directly from flake.nix
              # This avoids JSON serialization issues
              systems=($(grep -o '"[^"]*"[[:space:]]*=' flake.nix | grep -v '_\|#\|"\.\|\*' | sed 's/"//g' | sed 's/=//g' | xargs))

              echo "Found systems: ''${systems[@]}"
              echo "Building all compatible systems..."

              # Track success/failure
              success=()
              failure=()

              for system in "''${systems[@]}"; do
                echo "Attempting to build $system..."
                
                # Detect system type without JSON evaluation
                if nix eval --raw ".#nixosConfigurations.$system.pkgs.stdenv.hostPlatform.system" 2>/dev/null; then
                  system_type=$(nix eval --raw ".#nixosConfigurations.$system.pkgs.stdenv.hostPlatform.system" 2>/dev/null || echo "unknown")
                  
                  # Only build if we're on the same system type or can cross-compile
                  if [ "$system_type" = "x86_64-linux" ]; then
                    echo "Building $system (x86_64-linux)..."
                    if nix build ".#nixosConfigurations.$system.config.system.build.toplevel" --out-link "./result-$system" --no-link; then
                      echo "✅ Successfully built $system"
                      
                      # Copy to the binary cache
                      echo "Copying $system to binary cache..."
                      nix copy --to "https://cache.mjallen.dev?secret-key=/etc/nix/cache-priv-key.pem" ".#nixosConfigurations.$system.config.system.build.toplevel"
                      success+=("$system")
                    else
                      echo "❌ Failed to build $system"
                      failure+=("$system")
                    fi
                  elif [ "$system_type" = "aarch64-linux" ] && command -v qemu-aarch64-static >/dev/null 2>&1; then
                    echo "Cross-building $system (aarch64-linux)..."
                    if nix build ".#nixosConfigurations.$system.config.system.build.toplevel" --system aarch64-linux --out-link "./result-$system" --no-link; then
                      echo "✅ Successfully built $system"
                      nix copy --to "https://cache.mjallen.dev?secret-key=/etc/nix/cache-priv-key.pem" ".#nixosConfigurations.$system.config.system.build.toplevel"
                      success+=("$system")
                    else
                      echo "❌ Failed to build $system"
                      failure+=("$system")
                    fi
                  else
                    echo "⚠️ Skipping $system ($system_type) - incompatible with this host"
                    failure+=("$system (incompatible)")
                  fi
                elif nix eval --raw ".#darwinConfigurations.$system.system" 2>/dev/null; then
                  echo "Found Darwin system $system, attempting to build packages..."
                  if nix build ".#darwinConfigurations.$system.system" --out-link "./result-darwin-$system" --no-link; then
                    echo "✅ Successfully built $system packages"
                    nix copy --to "https://cache.mjallen.dev?secret-key=/etc/nix/cache-priv-key.pem" ".#darwinConfigurations.$system.system"
                    success+=("$system (darwin)")
                  else
                    echo "❌ Failed to build $system packages"
                    failure+=("$system (darwin)")
                  fi
                else
                  echo "⚠️ Skipping $system - could not determine system type"
                  failure+=("$system (unknown)")
                fi
              done

              # Summary
              echo ""
              echo "===== Build Summary ====="
              echo "✅ Successfully built: ''${success[*]:-none}"
              echo "❌ Failed to build: ''${failure[*]:-none}"

              # Return error code if any builds failed
              if [ ''${#failure[@]} -gt 0 ]; then
                exit 1
              fi
            ''
          );
        };

      # You could also provide a separate script that only lists systems
      apps.x86_64-linux.list-systems =
        let
          pkgs = nas-nixpkgs.legacyPackages.x86_64-linux;
        in
        {
          type = "app";
          program = toString (
            pkgs.writeShellScript "list-systems" ''
              #!/usr/bin/env bash
              set -euo pipefail

              # Get systems from flake.nix
              systems=($(grep -o '"[^"]*"[[:space:]]*=' flake.nix | grep -v '_\|#\|"\.\|\*' | sed 's/"//g' | sed 's/=//g' | xargs))

              echo "Found systems in flake.nix:"
              for system in "''${systems[@]}"; do
                # Try to determine if it's a NixOS or Darwin system
                if nix eval --raw ".#nixosConfigurations.$system.pkgs.stdenv.hostPlatform.system" 2>/dev/null; then
                  system_type=$(nix eval --raw ".#nixosConfigurations.$system.pkgs.stdenv.hostPlatform.system" 2>/dev/null)
                  echo "  - $system (NixOS, $system_type)"
                elif nix eval --raw ".#darwinConfigurations.$system.system" 2>/dev/null; then
                  echo "  - $system (Darwin)"
                else
                  echo "  - $system (unknown type)"
                fi
              done
            ''
          );
        };

      # Expose the package set, including overlays, for convenience.
      darwinPackages = self.darwinConfigurations."MacBook-Pro".pkgs;

      # Set Git commit hash for darwin-version.
      system.configurationRevision = self.rev or self.dirtyRev or null;
    };
}