# Daily refresh of the Hacktoberfest 2026 open-PR cleanup tracker.
# Ticks off any tracked pull request that has since been merged/closed, and
# rewrites the "Automated statistics" section (open issue/PR counts + the top
# three `awaiting reviews` directories). The job fails on purpose once
# Hacktoberfest 2026 has begun (>= 2026-10-01), which is the signal to retire it.
name: hacktoberfest_prep

on:
  push:
    paths:
      - ".github/workflows/hacktoberfest_prep.yml"
      - "scripts/hacktoberfest_prep_update.py"
  pull_request:
    paths:
      - ".github/workflows/hacktoberfest_prep.yml"
      - "scripts/hacktoberfest_prep_update.py"
  # schedule:
  #   - cron: "50 11 * * *" # 11:50 UTC every day
  workflow_dispatch: # allow a manual run while testing

permissions:
  contents: write
  pull-requests: write

jobs:
  hacktoberfest-prep:
    # No point running on forks — this pushes to the repo's own docs file.
    if: github.repository == 'TheAlgorithms/Python'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
        with:
          persist-credentials: false
      - uses: actions/setup-python@v7
        with:
          python-version-file: .python-version
          allow-prereleases: true
      - name: Install dependencies
        run: python -m pip install --upgrade "httpx2>=2.0.1"
      - name: Update the tracker
        id: update
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GITHUB_REPOSITORY: ${{ github.repository }}
        # Don't let the intentional post-Oct-1 failure stop the commit step;
        # capture the exit code and re-raise it after pushing any changes.
        run: |
          set +e
          python scripts/hacktoberfest_prep_update.py
          echo "exit_code=$?" >> "$GITHUB_OUTPUT"
      # Dry run on push / pull_request: show the diff the script produced but
      # do NOT commit or push. This lets a PR prove the tracker still gathers
      # its data and rewrites docs/hacktober_2026_prep.md correctly without
      # leaving a permanent commit. Only the schedule/manual runs persist.
      - name: Show changes (dry run)
        if: github.event_name == 'push' || github.event_name == 'pull_request'
        run: |
          echo "Dry run (${{ github.event_name }}): showing git diff, not committing."
          git --no-pager diff -- docs/hacktober_2026_prep.md
          if git diff --quiet -- docs/hacktober_2026_prep.md; then
            echo "No changes to docs/hacktober_2026_prep.md."
          fi
      # `master` is a protected branch: direct pushes are rejected with
      # `GH006: Protected branch update failed ... Changes must be made through
      # a pull request`. So instead of committing straight to master, persist
      # the refreshed tracker on a single rolling branch and open — or, since
      # re-pushing the branch updates the existing PR in place, leave open — one
      # pull request. Uses the bundled `gh` CLI rather than a third-party
      # action (see zizmor's "superfluous actions" audit).
      - name: Open or update the tracker pull request
        if: github.event_name != 'push' && github.event_name != 'pull_request'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          BRANCH: chore/hacktoberfest-2026-prep-refresh
        run: |
          set -euo pipefail
          if git diff --quiet -- docs/hacktober_2026_prep.md; then
            echo "No changes to docs/hacktober_2026_prep.md; nothing to persist."
            exit 0
          fi
          git config --global user.name "$GITHUB_ACTOR"
          git config --global user.email "$GITHUB_ACTOR@users.noreply.github.com"
          # `actions/checkout` runs with `persist-credentials: false`, so git has
          # no token to authenticate the push below (it fails with
          # `fatal: could not read Username for 'https://github.com'`). Wire the
          # bundled `gh` in as git's credential helper so `git push` reuses
          # GH_TOKEN — no third-party action and no token baked into the remote URL.
          gh auth setup-git
          git switch -c "$BRANCH"
          git add docs/hacktober_2026_prep.md
          git commit -m "chore: refresh Hacktoberfest 2026 prep tracker"
          # Force-push so the rolling branch always carries just the latest
          # snapshot on top of master; this also updates any open PR in place.
          git push --force origin "$BRANCH"
          if [ -z "$(gh pr list --head "$BRANCH" --state open --json number --jq '.[].number')" ]; then
            gh pr create \
              --base master \
              --head "$BRANCH" \
              --title "chore: refresh Hacktoberfest 2026 prep tracker" \
              --body "Automated daily refresh of the Hacktoberfest 2026 open-PR cleanup tracker (\`docs/hacktober_2026_prep.md\`): ticks off any tracked pull request that has since been merged/closed and rewrites the **Automated statistics** section.

          This PR is updated in place by the \`hacktoberfest_prep\` workflow, so it always reflects the latest scheduled run. Merge it whenever you want to capture the current snapshot."
          else
            echo "Open tracker PR already exists; force-push updated it in place."
          fi
      - name: Propagate the script's exit code
        env:
          UPDATE_EXIT_CODE: ${{ steps.update.outputs.exit_code }}
        run: exit ${UPDATE_EXIT_CODE}