name: Refresh BESS list snapshot

on:
  schedule:
    # Daily at 02:00 UTC (~12:00 AEST). AEMO publishes Gen Info updates monthly,
    # so most days produce no diff.
    - cron: "0 2 * * *"
  workflow_dispatch: {}

permissions:
  contents: write

jobs:
  refresh:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: master

      - uses: actions/setup-python@v5
        with:
          python-version: "3.11"

      - name: Install minimal deps
        run: pip install --no-cache-dir httpx==0.27.* openpyxl==3.1.*

      - name: Refresh snapshot
        run: python scripts/refresh_bess_list.py

      - name: Commit if changed
        run: |
          set -e
          # Only commit if the parsed JSON changed. The meta file changes every
          # run (timestamp); committing it alone would churn master without
          # delivering new data.
          if git diff --quiet -- app/data/bess_list.json; then
            echo "No change in bess_list.json; skipping commit."
            exit 0
          fi
          git config user.name  "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add app/data/bess_list.json app/data/bess_list_meta.json
          git commit -m "Refresh BESS list snapshot from AEMO XLSX"
          git push origin master