name: Rebuild data model documentation
on:
  workflow_dispatch:
  schedule:
    - cron: '17 1 * * *'  # 01:17 every night
jobs:
  datamodel-doc:
    runs-on: ubuntu-latest
    if: github.repository == 'AliceO2Group/AliceO2'
    steps:

      - name: Checkout O2
        uses: actions/checkout@v5
        with:
          path: O2
          persist-credentials: false

      - name: Checkout O2Physics
        uses: actions/checkout@v5
        with:
          repository: AliceO2Group/O2Physics
          path: O2Physics
          persist-credentials: false

      - name: Checkout documentation
        uses: actions/checkout@v5
        with:
          repository: AliceO2Group/analysis-framework
          path: analysis-framework
          persist-credentials: false
          # To push the updated branch, we need a non-shallow clone.
          fetch-depth: 0

      - name: Create PR branch in docs
        working-directory: analysis-framework
        run: |
          git config --global user.email 'alibuild@cern.ch'
          git config --global user.name 'ALICE Action Bot'
          # Overwrite branch, creating a new one based on HEAD
          git checkout -B auto-datamodel-doc

      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: 3.x

      - name: Install prerequisites
        run: |
          python3 -m pip install --user -U numpy nltk
          python3 -m nltk.downloader -d ~/nltk_data punkt
          python3 -m nltk.downloader -d ~/nltk_data punkt_tab

      - name: Generate documentation
        run: exec bash -exo pipefail O2/scripts/datamodel-doc/update-datamodel.sh

      - name: Send pull request with updated docs
        env:
          GITHUB_TOKEN: ${{ secrets.ALIBUILD_GITHUB_TOKEN }}
        working-directory: analysis-framework/docs/datamodel
        run: |
          # git diff --quiet exits with 1 if any tracked files have changed, and
          # with 0 otherwise.
          set -e
          if git diff --quiet; then
            exit  # Nothing has changed, so no need to send a PR.
          fi
          git add ao2dTables.md helperTaskTables.md pwgTables.md joinsAndIterators.md
          git commit -m 'Automatic data model update'
          git remote set-url origin "https://alibuild:$GITHUB_TOKEN@github.com/alibuild/analysis-framework"
          git push -f origin auto-datamodel-doc

          # Send pull request
          # We need to use "gh" ourselves because alisw/pull-request gets
          # confused when multiple repos are checked out.
          GH_TOKEN="$GITHUB_TOKEN" gh pr create -R AliceO2Group/analysis-framework -B master \
          --no-maintainer-edit -t 'Automatic data model update' -b "This update \
          to the data model documentation was automatically created from \
          tonight's O2 dev branch." || true
          # If the PR already exists, hub fails, but we've just force-pushed, so we don't need a new PR.