name: Nix CI

on:
  push:
    branches:
      - main
      - master
  pull_request:

jobs:
  nix-tests:
    name: Nix Build & Tests
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v27
        with:
          extra_nix_config: |
            experimental-features = nix-command flakes

      - name: Build ARC with Nix
        run: nix build .#arc

      - name: Run flake checks
        run: nix flake check --show-trace

      - name: Run Makefile tests inside Nix environment
        run: |
          nix develop -c bash -c "make test"

      # Changed step:
      - name: Run arc --help via Nix app
        run: |
          nix run .#arc -- --help