{
  description = "main system and home configuration flake";

  inputs = {
    # NixOS official package source, using the nixos-25.05 branch as stable and nixos-unstable as default
    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-25.05";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs-master.url = "github:NixOS/nixpkgs/master";
    nur.url = "github:nix-community/NUR";

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

    # Automatic themeing (using home-manager module)
    stylix = {
      url = "github:nix-community/stylix/";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    # Declarative flatpak management, documentation states overriding nixpkgs is not supported
    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=latest";

    # Easy Nix-based neovim config
    nvf = {
      url = "github:notashelf/nvf";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    # Disk partitioning
    disko = {
      url = "github:nix-community/disko";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    # An-anime-game-launcher
    aagl = {
      url = "github:ezKEa/aagl-gtk-on-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    # NixOS Secure Boot
    lanzaboote = {
      url = "github:nix-community/lanzaboote";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    # Useful flake for satusfactory server config in nix
    satisfactory-server = {
      url = "github:nekowinston/satisfactory-server-flake";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    musnix.url = "github:musnix/musnix";
  };

  outputs =
    {
      self,
      nixpkgs-stable,
      nixpkgs,
      nixpkgs-master,
      nur,
      home-manager,
      ...
    }@inputs:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs {
        inherit system;
        config = {
          allowUnfree = true;
        };
        overlays = [
          overlay-stable
          overlay-master
          nur.overlays.default
        ];
      };
      genericModules = [
        {
          nix.registry.nixos.flake = inputs.self;
          environment.etc."nix/inputs/nixpkgs".source = nixpkgs.outPath;
          nix.nixPath = [ "nixpkgs=${nixpkgs.outPath}" ];
        }
      ];
      genericHomeModule = [
        {
          nix.registry.nixos.flake = inputs.self;
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
        }
      ];
      # Overlay definitions
      # nixpkgs-unstable
      overlay-stable = final: prev: {
        stable = import nixpkgs-stable {
          inherit system;
          config.allowUnfree = true;
        };
      };
      # nixpkgs-master
      overlay-master = final: prev: {
        master = import nixpkgs-master {
          inherit system;
          config.allowUnfree = true;
        };
      };
    in
    {
      nixosConfigurations.gabbielaptop = nixpkgs.lib.nixosSystem {
        inherit system;
        inherit pkgs;
        specialArgs = {
          inherit inputs;
        };
        modules = genericModules ++ [
          # Import nixos modules here
          ./hosts/gabbielaptop/configuration.nix
          ./modules/nh.nix
          ./modules/waydroid.nix
          ./modules/packages.nix
          ./modules/aagl.nix
          inputs.aagl.nixosModules.default
          inputs.lanzaboote.nixosModules.lanzaboote
          inputs.musnix.nixosModules.musnix
          { nix.settings = inputs.aagl.nixConfig; } # Setup cachix for aagl projects
        ];
      };
      nixosConfigurations.biggerpi = nixpkgs.lib.nixosSystem {
        inherit system;
        inherit pkgs;
        modules = genericModules ++ [
          inputs.disko.nixosModules.disko
          inputs.satisfactory-server.nixosModules.satisfactory
          ./hosts/biggerpi/configuration.nix
          ./modules/satisfactory-server.nix
        ];
      };

      #  Standalone home-manager config
      homeConfigurations.blue = home-manager.lib.homeManagerConfiguration {
        inherit pkgs;
        extraSpecialArgs = {
          inherit inputs;
        };
        # Import home-manager modules here
        modules = [
          ./home-manager/home.nix
          inputs.nvf.homeManagerModules.default
          inputs.stylix.homeModules.stylix
          inputs.nix-flatpak.homeManagerModules.nix-flatpak
        ];
      };
      # set formatter, using nixfmt-tree here
      formatter.${system} = nixpkgs.legacyPackages.${system}.nixfmt-tree;
    };
}