name: PySR backend update
on:
  schedule:
    - cron: '00 00 * * *'
  workflow_dispatch:
jobs:
  update_compat:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: 3.12
          cache: pip

      - name: "Install dependencies"
        run: |
          python -m pip install --upgrade pip
          pip install tomlkit

      - name: "Get SymbolicRegression.jl latest version"
        id: get-latest
        run: |
          cd $(mktemp -d)
          git clone https://github.com/MilesCranmer/SymbolicRegression.jl
          cd SymbolicRegression.jl
          echo "version=$(git describe --tags --match='v*' --abbrev=0 | sed 's/^v//')" >> $GITHUB_OUTPUT

      - name: "Update SymbolicRegression.jl version in PySR"
        run: |
          python .github/workflows/update_backend_version.py ${{ steps.get-latest.outputs.version }}

      - name: "Restore changes if no diff to `pysr/juliapkg.json`"
        run: |
          if git diff --quiet pysr/juliapkg.json; then
            echo "No changes to pysr/juliapkg.json. Restoring changes."
            git restore pyproject.toml
          fi

      - name: "Create PR if necessary"
        uses: peter-evans/create-pull-request@v6
        with:
          title: "Automated update to backend: v${{ steps.get-latest.outputs.version }}"
          body: |
            This PR was automatically generated by the GitHub Action `.github/workflows/update-backend.yml`

            It updates the backend version to v${{ steps.get-latest.outputs.version }}. For a full description of the changes, see the backend changelog: [v${{ steps.get-latest.outputs.version }}](https://github.com/MilesCranmer/SymbolicRegression.jl/releases/tag/v${{ steps.get-latest.outputs.version }}).
          delete-branch: true
          commit-message: "Update backend version to v${{ steps.get-latest.outputs.version }}"
          add-paths: |
            pyproject.toml
            pysr/juliapkg.json