ci-python.yml

name: Python API Tests 🐍

on:
  push:

jobs:
  python-tests:
    runs-on: ubuntu-latest

    env:
      PINEAPPL_VERSION: 1.4.0-alpha1
      APFELXX_BRANCH: QED

    steps:
      - uses: actions/checkout@v4

      # ---- Python environment ----
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.12"

      # ---- System C++ build tools ----
      - name: Install system dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y build-essential cmake pkg-config libyaml-cpp-dev ninja-build

      # ---- Cache local installs (.local) ----
      - name: Cache PineAPPL and APFEL++
        id: cache-local
        uses: actions/cache@v4
        with:
          path: ~/.local
          key: >
            ${{ runner.os }}-local-
            pineappl-${{ env.PINEAPPL_VERSION }}-
            apfelxx-${{ env.APFELXX_BRANCH }}-
            ${{ hashFiles('.github/workflows/ci-python.yml') }}

      # ---- Install PineAPPL C API (if not cached) ----
      - name: Install PineAPPL C API
        if: steps.cache-local.outputs.cache-hit != 'true'
        run: |
          curl --proto '=https' --tlsv1.2 -sSf https://nnpdf.github.io/pineappl/install-capi.sh \
            | sh -s -- --prefix "$HOME/.local" --version $PINEAPPL_VERSION

      # ---- Build APFEL++ from source (if not cached) ----
      - name: Build and install APFEL++
        if: steps.cache-local.outputs.cache-hit != 'true'
        run: |
          git clone --branch $APFELXX_BRANCH https://github.com/vbertone/apfelxx.git /tmp/apfelxx
          cd /tmp/apfelxx
          mkdir build && cd build
          cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/.local
          make -j$(nproc)
          make install

      # ---- Export C++ library paths ----
      - name: Export local paths
        run: |
          echo "$HOME/.local/bin" >> $GITHUB_PATH
          echo "PKG_CONFIG_PATH=$HOME/.local/lib/pkgconfig:$PKG_CONFIG_PATH" >> $GITHUB_ENV
          echo "LD_LIBRARY_PATH=$HOME/.local/lib:$LD_LIBRARY_PATH" >> $GITHUB_ENV

      # ---- Python dependencies ----
      - name: Install Python dependencies
        run: |
          pip install meson ninja pybind11 pineappl numpy pytest

      # ---- Build pineapfel with Meson (produces the Python extension .so) ----
      - name: Build pineapfel
        run: |
          meson setup builddir
          ninja -C builddir

      # ---- Expose the Python package for in-tree testing ----
      - name: Set up pineapfel Python package
        run: |
          SO_FILE=$(ls builddir/_pineapfel*.so 2>/dev/null | head -1)
          if [ -z "$SO_FILE" ]; then
            echo "ERROR: _pineapfel*.so not found in builddir/" && exit 1
          fi
          ln -sf "$(pwd)/$SO_FILE" pineapfel_pyapi/pineapfel/
          echo "PYTHONPATH=$(pwd)/pineapfel_pyapi" >> $GITHUB_ENV

      # ---- Run the Python test suite ----
      - name: Run Python tests
        run: |
          python3 -m pytest pineapfel_pyapi/tests/ -v --tb=short