name: "PR Management Request Backport via Mergify"

on:
  workflow_run:
    workflows:
      - "PR Management Request Backport via Mergify Collect Data"
    types: [completed]

jobs:
  comment-backport:
    runs-on: ubuntu-latest
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    permissions:
      actions: read
      pull-requests: write
    steps:
      - name: Download PR data artifact
        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
        with:
          name: pr-backport-request-data
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ github.token }}

      - name: Load PR data
        run: |
          cat pr-backport-request-data.env >> $GITHUB_ENV

      - name: Post Mergify backport command
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail

          pr_number="$PR_NUMBER"
          repo="${{ github.repository }}"

          labels=$(echo "$PR_LABELS" | tr ',' '\n')

          echo "Labels on PR: $labels"

          matches=$(echo "$labels" | grep -oE '^require backport/v[0-9]+\.[0-9]+$' || true)

          if [[ -z "$matches" ]]; then
            echo "No back-port labels found — skipping."
            exit 0
          fi

          branches=$(echo "$matches" \
            | sed -E 's/^require backport\/v/release-harvester-v/' \
            | sort -u | tr '\n' ' ')
          branches=${branches%% }

          cmd="@Mergifyio backport $branches"
          echo "Posting Mergify command: $cmd"
          gh pr comment "$pr_number" --repo "$repo" --body "$cmd"