{
  description = "Flake of ponymushama";

  outputs = inputs@{ self, ... }:
    let
      # ---- SYSTEM SETTINGS ---- #
      systemSettings = {
        system = "x86_64-linux"; # system arch
        hostname = "ama_nix"; # hostname
        profile = "personal"; # select a profile defined from my profiles directory
        timezone = "Asia/Shanghai"; # select timezone
        locale = "en_US.UTF-8"; # select locale
        bootMode = "uefi"; # uefi or bios
        bootMountPath = "/boot"; # mount path for efi boot partition; only used for uefi boot mode
        grubDevice = ""; # device identifier for grub; only used for legacy (bios) boot mode
        gpuType = "amd"; # amd, intel or nvidia; only makes some slight mods for amd at the moment
      };

      # ----- USER SETTINGS ----- #
      userSettings = rec {
        username = "ama"; # username
        name = "ama"; # name/identifier
        email = "ponymushama@gmail.com"; # email (used for certain configurations)
        dotfilesDir = "~/.dotfiles"; # absolute path of the local repo
        theme = "io"; # selcted theme from my themes directory (./themes/)
        wm = "hyprland"; # Selected window manager or desktop environment; must select one in both ./user/wm/ and ./system/wm/
        # window manager type (hyprland or x11) translator
        wmType = if (wm == "hyprland") then "wayland" else "x11";
        browser = "librewolf"; # Default browser; must select one from ./user/app/browser/
        defaultRoamDir = "Personal.p"; # Default org roam directory relative to ~/Org
        term = "alacritty"; # Default terminal command;
        font = "Intel One Mono"; # Selected font
        fontPkg = pkgs.intel-one-mono; # Font package
        editor = "nvim"; # Default editor;
        # editor spawning translator
        # generates a command that can be used to spawn editor inside a gui
        # EDITOR and TERM session variables must be set in home.nix or other module
        # I set the session variable SPAWNEDITOR to this in my home.nix for convenience
        spawnEditor = if (editor == "emacsclient") then
                        "emacsclient -c -a 'emacs'"
                      else
                        (if ((editor == "vim") ||
                             (editor == "nvim") ||
                             (editor == "nano")) then
                               "exec " + term + " -e " + editor
                         else
                           editor);
      };

      # create patched nixpkgs
      nixpkgs-patched =
        (import inputs.nixpkgs { system = systemSettings.system; rocmSupport = (if systemSettings.gpu == "amd" then true else false); }).applyPatches {
          name = "nixpkgs-patched";
          src = inputs.nixpkgs;
        };

      # configure pkgs
      # use nixpkgs if running a server (homelab or worklab profile)
      # otherwise use patched nixos-unstable nixpkgs
      pkgs = (if ((systemSettings.profile == "homelab") || (systemSettings.profile == "worklab"))
              then
                pkgs-stable
              else
                (import nixpkgs-patched {
                  system = systemSettings.system;
                  config = {
                    allowUnfree = true;
                    allowUnfreePredicate = (_: true);
                  };
                  overlays = [ inputs.rust-overlay.overlays.default ];
                }));

      pkgs-stable = import inputs.nixpkgs-stable {
        system = systemSettings.system;
        config = {
          allowUnfree = true;
          allowUnfreePredicate = (_: true);
        };
      };

      pkgs-unstable = import inputs.nixpkgs-patched {
        system = systemSettings.system;
        config = {
          allowUnfree = true;
          allowUnfreePredicate = (_: true);
        };
        overlays = [ inputs.rust-overlay.overlays.default ];
      };

      pkgs-kdenlive = import inputs.kdenlive-pin-nixpkgs {
        system = systemSettings.system;
      };

      pkgs-nwg-dock-hyprland = import inputs.nwg-dock-hyprland-pin-nixpkgs {
        system = systemSettings.system;
      };

      # configure lib
      # use nixpkgs if running a server (homelab or worklab profile)
      # otherwise use patched nixos-unstable nixpkgs
      lib = (if ((systemSettings.profile == "homelab") || (systemSettings.profile == "worklab"))
             then
               inputs.nixpkgs-stable.lib
             else
               inputs.nixpkgs.lib);

      # use home-manager-stable if running a server (homelab or worklab profile)
      # otherwise use home-manager-unstable
      home-manager = (if ((systemSettings.profile == "homelab") || (systemSettings.profile == "worklab"))
             then
               inputs.home-manager-stable
             else
               inputs.home-manager-unstable);

      # Systems that can run tests:
      supportedSystems = [ "aarch64-linux" "i686-linux" "x86_64-linux" ];

      # Function to generate a set based on supported systems:
      forAllSystems = inputs.nixpkgs.lib.genAttrs supportedSystems;

      # Attribute set of nixpkgs for each system:
      nixpkgsFor =
        forAllSystems (system: import inputs.nixpkgs { inherit system; });

    in {
      homeConfigurations = {
        user = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;
          modules = [
            (./. + "/profiles" + ("/" + systemSettings.profile) + "/home.nix") # load home.nix from selected PROFILE
          ];
          extraSpecialArgs = {
            # pass config variables from above
            inherit pkgs-stable;
            inherit pkgs-kdenlive;
            inherit pkgs-nwg-dock-hyprland;
            inherit systemSettings;
            inherit userSettings;
            inherit inputs;
          };
        };
      };
      nixosConfigurations = {
        system = lib.nixosSystem {
          system = systemSettings.system;
          modules = [
            (./. + "/profiles" + ("/" + systemSettings.profile) + "/configuration.nix")
            ./system/bin/phoenix.nix
          ]; # load configuration.nix from selected PROFILE
          specialArgs = {
            # pass config variables from above
            inherit pkgs-stable;
            inherit systemSettings;
            inherit userSettings;
            inherit inputs;
          };
        };
      };
      nixOnDroidConfigurations = {
        inherit pkgs;
        default = inputs.nix-on-droid.lib.nixOnDroidConfiguration {
          modules = [ ./profiles/nix-on-droid/configuration.nix ];
        };
        extraSpecialArgs = {
          # pass config variables from above
          inherit pkgs-stable;
          inherit systemSettings;
          inherit userSettings;
          inherit inputs;
        };
      };

      packages = forAllSystems (system:
        let pkgs = nixpkgsFor.${system};
        in {
          default = self.packages.${system}.install;

          install = pkgs.writeShellApplication {
            name = "install";
            runtimeInputs = with pkgs; [ git ]; # I could make this fancier by adding other deps
            text = ''${./install.sh} "$@"'';
          };
        });

      apps = forAllSystems (system: {
        default = self.apps.${system}.install;

        install = {
          type = "app";
          program = "${self.packages.${system}.install}/bin/install";
        };
      });
    };

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    nixpkgs-stable.url = "nixpkgs/nixos-24.05";
    kdenlive-pin-nixpkgs.url = "nixpkgs/cfec6d9203a461d9d698d8a60ef003cac6d0da94";
    nwg-dock-hyprland-pin-nixpkgs.url = "nixpkgs/2098d845d76f8a21ae4fe12ed7c7df49098d3f15";

    home-manager-unstable.url = "github:nix-community/home-manager/master";
    home-manager-unstable.inputs.nixpkgs.follows = "nixpkgs";

    home-manager-stable.url = "github:nix-community/home-manager/release-24.05";
    home-manager-stable.inputs.nixpkgs.follows = "nixpkgs-stable";

    nix-on-droid = {
      url = "github:nix-community/nix-on-droid/master";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.home-manager.follows = "home-manager-unstable";
    };

    hyprland = {
      type = "git";
      url = "https://github.com/hyprwm/Hyprland";
      submodules = true;
      rev = "918d8340afd652b011b937d29d5eea0be08467f5";
    };
    hyprland.inputs.nixpkgs.follows = "nixpkgs";
    hyprland-plugins.url = "github:hyprwm/hyprland-plugins/3ae670253a5a3ae1e3a3104fb732a8c990a31487";
    hyprland-plugins.inputs.hyprland.follows = "hyprland";
    hycov.url = "github:DreamMaoMao/hycov/de15cdd6bf2e46cbc69735307f340b57e2ce3dd0";
    hycov.inputs.hyprland.follows = "hyprland";
    hyprgrass.url = "github:horriblename/hyprgrass/736119f828eecaed2deaae1d6ff1f50d6dabaaba";
    hyprgrass.inputs.hyprland.follows = "hyprland";

    rust-overlay.url = "github:oxalica/rust-overlay";

    blocklist-hosts = {
      url = "github:StevenBlack/hosts";
      flake = false;
    };
  };
}