{
  description = "CentralCloud OnCall Mobile — ntfy iOS app (Swift/Xcode, macOS only)";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
    flake-utils.url = "github:numtide/flake-utils";
  };

  nixConfig = {
    extra-substituters = [
      "https://cache.centralcloud.com/default"
    ];
    extra-trusted-public-keys = [
      "default:ywfU21WX06iOn2Ec2lae1jYh4w8LO4IQkmp06vJzsk8="
    ];
  };

  outputs = {
    nixpkgs,
    flake-utils,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {inherit system;};
      isDarwin = pkgs.stdenv.isDarwin;
    in {
      devShells.default = pkgs.mkShell {
        packages =
          [
            pkgs.git
            pkgs.jq
          ]
          ++ pkgs.lib.optionals isDarwin [
            # macOS-only: Xcode toolchain is managed outside Nix via xcode-select
            pkgs.xcbeautify   # prettier xcodebuild output
            pkgs.swiftlint    # Swift linting
            pkgs.swiftformat  # Swift formatting
          ];

        shellHook = ''
          echo "CentralCloud OnCall Mobile (iOS) dev shell"
          ${pkgs.lib.optionalString isDarwin ''
            echo "  xcbeautify : $(xcbeautify --version 2>/dev/null || echo 'available')"
            echo "  swiftlint  : $(swiftlint --version 2>/dev/null || echo 'available')"
            echo ""
            echo "Build: xcodebuild -scheme ntfy -destination 'generic/platform=iOS' | xcbeautify"
            echo "Note : Xcode must be installed via xcode-select (not managed by Nix)"
          ''}
          ${pkgs.lib.optionalString (!isDarwin) ''
            echo ""
            echo "NOTE: iOS builds require macOS + Xcode. This shell provides only"
            echo "      scripting utilities on Linux/other platforms."
          ''}
        '';
      };
    });
}