{
  description = "Set Philips Hue lights using MQTT";

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

    pyproject-nix = {
      url = "github:pyproject-nix/pyproject.nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    uv2nix = {
      url = "github:pyproject-nix/uv2nix";
      inputs.pyproject-nix.follows = "pyproject-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    pyproject-build-systems = {
      url = "github:pyproject-nix/build-system-pkgs";
      inputs.pyproject-nix.follows = "pyproject-nix";
      inputs.uv2nix.follows = "uv2nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      uv2nix,
      pyproject-nix,
      pyproject-build-systems,
      ...
    }:
    let
      inherit (nixpkgs) lib;
      forAllSystems = lib.genAttrs lib.systems.flakeExposed;

      workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };

      overlay = workspace.mkPyprojectOverlay {
        sourcePreference = "wheel";
      };

      editableOverlay = workspace.mkEditablePyprojectOverlay {
        root = "$REPO_ROOT";
      };

      # Python sets grouped per system
      pythonSets = forAllSystems (
        system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          inherit (pkgs) stdenv;

          # Base Python package set from pyproject.nix
          baseSet = pkgs.callPackage pyproject-nix.build.packages {
            python = pkgs.python312;
          };

          # An overlay of build fixups & test additions
          pyprojectOverrides = (
            final: prev: {

              huecli = prev.huecli.overrideAttrs (old: {

                # Add tests to passthru.tests
                #
                # These attribute are used in Flake checks.
                passthru = old.passthru // {
                  tests = (old.tests or { }) // {

                    # Run mypy checks
                    mypy =
                      let
                        venv = final.mkVirtualEnv "huecli-typing-env" {
                          huecli = [ "typing" ];
                        };
                      in
                      stdenv.mkDerivation {
                        name = "${final.huecli.name}-mypy";
                        inherit (final.huecli) src;
                        nativeBuildInputs = [
                          venv
                        ];
                        dontConfigure = true;
                        dontInstall = true;
                        buildPhase = ''
                          mkdir $out
                          mypy --strict huecli --junit-xml $out/junit.xml
                        '';
                      };
                  };
                };
              });
            }
          );

        in
        baseSet.overrideScope (
          lib.composeManyExtensions [
            pyproject-build-systems.overlays.default
            overlay
            pyprojectOverrides
          ]
        )
      );
    in
    {
      checks = forAllSystems (
        system:
        let
          pythonSet = pythonSets.${system};
        in
        # Inherit tests from passthru.tests into flake checks
        pythonSet.huecli.passthru.tests
      );

      packages = forAllSystems (
        system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          pythonSet = pythonSets.${system};
          venv = pythonSet.mkVirtualEnv "huecli-env" workspace.deps.default;
        in
        {
          default = pkgs.stdenv.mkDerivation {
            pname = "huecli";
            # TODO: Fix this, get version from pyproject
            version = "0.1.7";
            dontConfigure = true;
            dontUnpack = true;
            dontBuild = true;
            buildInputs = [ venv ];
            nativeBuildInputs = [ pkgs.installShellFiles ];
            postInstall = ''
              mkdir -p $out/bin
              ln -s ${venv}/bin/huecli $out/bin/huecli
              installShellCompletion --cmd huecli \
              --bash <($out/bin/huecli --show-completion bash) \
              --zsh <($out/bin/huecli --show-completion zsh) \
              --fish <($out/bin/huecli --show-completion fish)
            '';
          };
        }
      );

      overlays.default = final: prev: {
        huecli = self.packages.${prev.system}.default;
      };

      # Use an editable Python set for development.
      devShells = forAllSystems (
        system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          editablePythonSet = pythonSets.${system}.overrideScope editableOverlay;
          venv = editablePythonSet.mkVirtualEnv "huecli-dev-env" {
            huecli = [ "dev" ];
          };
        in
        {
          default = pkgs.mkShell {
            packages = [
              venv
              pkgs.uv
            ];
            shellHook = ''
              unset PYTHONPATH
              export REPO_ROOT=$(git rev-parse --show-toplevel)
              export UV_NO_SYNC=1
            '';
          };
        }
      );
    };
}