name: Backend Tests

on:
  push:
    branches:
      - main
      - master
    paths:
      - 'py/**'
      - 'standalone.py'
      - 'tests/**'
      - 'requirements.txt'
      - 'requirements-dev.txt'
      - 'pyproject.toml'
      - 'pytest.ini'
      - '.github/workflows/backend-tests.yml'
  pull_request:
    paths:
      - 'py/**'
      - 'standalone.py'
      - 'tests/**'
      - 'requirements.txt'
      - 'requirements-dev.txt'
      - 'pyproject.toml'
      - 'pytest.ini'
      - '.github/workflows/backend-tests.yml'

jobs:
  pytest:
    name: Run pytest with coverage
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@v4

      - name: Set up Python 3.11
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'
          cache: 'pip'
          cache-dependency-path: |
            requirements.txt
            requirements-dev.txt

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements-dev.txt

      - name: Verify symlink support
        run: |
          python - <<'PY'
          import os
          import pathlib
          import tempfile

          root = pathlib.Path(tempfile.mkdtemp(prefix="lm-symlink-check-"))
          target = root / "target"
          target.mkdir()
          link = root / "link"
          try:
              link.symlink_to(target, target_is_directory=True)
          except OSError as exc:
              raise SystemExit(f"Failed to create directory symlink in CI: {exc}")

          is_link = os.path.islink(link)
          is_dir = os.path.isdir(link)
          realpath = os.path.realpath(link)
          print(f"islink={is_link} isdir={is_dir} realpath={realpath}")
          if not (is_link and is_dir and realpath == str(target)):
              raise SystemExit("Directory symlink is not functioning correctly in CI; aborting.")
          PY

      - name: Run pytest with coverage
        env:
          COVERAGE_FILE: coverage/backend/.coverage
        run: |
          mkdir -p coverage/backend
          python -m pytest \
            --cov=py \
            --cov=standalone \
            --cov-report=term-missing \
            --cov-report=xml:coverage/backend/coverage.xml \
            --cov-report=html:coverage/backend/html \
            --cov-report=json:coverage/backend/coverage.json

      - name: Upload coverage artifact
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: backend-coverage
          path: coverage/backend
          if-no-files-found: warn