name: Notebook Test
on: [push]

jobs:
  nb-test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"   # avoid bleeding-edge 3.13 surprises

      - name: Install deps
        run: |
          python -m pip install --upgrade pip
          pip install papermill nbformat ipykernel

      - name: Ensure kernel
        run: python -m ipykernel install --user --name python3

      - name: Create sample notebook if missing
        run: |
          if [ ! -f notebook.ipynb ]; then
            python - <<'PY'
            import nbformat as nbf
            nb = nbf.v4.new_notebook()
            nb.cells = [
              nbf.v4.new_markdown_cell("# Demo Notebook"),
              nbf.v4.new_code_cell("x = 2 + 2\nprint('Result:', x)")
            ]
            with open("notebook.ipynb", "w", encoding="utf-8") as f:
                nbf.write(nb, f)
            PY
          fi

      - name: Execute notebook with Papermill
        run: papermill notebook.ipynb output.ipynb -k python3