{
  description = "Elixir system monitor daemon";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          system = system;
          config.allowUnfree = true;
        };
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            # Elixir/Erlang for server
            elixir
            erlang
            
            # AI/Development tools  
            claude-code
            aider-chat
            
            # Node.js tools
            nodejs_20
            yarn
            deno
            
            # Python for Home Assistant integration
            python311
            python311Packages.pip
            python311Packages.ipython
            python311Packages.pytest
            python311Packages.black
            python311Packages.isort
            python311Packages.flake8
            python311Packages.mypy
            
            # Home Assistant for development
            home-assistant
          ];

          shellHook = ''
            echo "Systant development environment loaded"
            echo "Elixir: $(elixir --version | head -1)"
            echo "Python: $(python --version)"
            echo "Home Assistant: $(hass --version)"
            echo ""
            echo "Available tools: pytest, black, isort, flake8, mypy"
            echo ""
            echo "Directories:"
            echo "  server/ - Elixir systant daemon"
            echo "  home-assistant-integration/ - Home Assistant custom integration"
            echo "  dev-config/ - Home Assistant development configuration"
            echo ""
            echo "Commands:"
            echo "  hass --config ./dev-config - Start HA dev instance (uses mqtt.home)"
          '';
        };
        packages = {
          default = pkgs.callPackage ./nix/package.nix {
            src = ./server;
          };
          systant = pkgs.callPackage ./nix/package.nix {
            src = ./server;
          };
        };

        apps = {
          default = {
            type = "app";
            program = "${self.packages.${system}.default}/bin/systant";
          };
        };
      }
    ) // {
      nixosModules.default = import ./nix/nixos-module.nix;
    };
}