name: Automatic Backport

on:
  pull_request_target:
    branches: ['master']
    types: ['labeled', 'closed']

jobs:
  backport:
    name: Backport PR
    if: github.event.pull_request.merged == true && !(contains(github.event.pull_request.labels.*.name, 'backport'))
    runs-on: ubuntu-latest
    permissions:
      id-token: write
      pull-requests: write
      contents: write
    steps:
      # Workaround not to fail the workflow if the PR does not need a backport
      # https://github.com/sorenlouv/backport-github-action/issues/127#issuecomment-2258561266
      - name: Check for backport labels
        id: check_labels
        run: |-
          labels='${{ toJSON(github.event.pull_request.labels.*.name) }}'
          echo "$labels"
          matched=$(echo "${labels}" | jq '. | map(select(startswith("backport-to-"))) | length')
          echo "matched=$matched"
          echo "matched=$matched" >> $GITHUB_OUTPUT

      - name: Backport Action
        if: fromJSON(steps.check_labels.outputs.matched) > 0
        uses: sorenlouv/backport-github-action@v9.5.1
        with:
          github_token: ${{ secrets.PROWLER_BOT_ACCESS_TOKEN }}
          auto_backport_label_prefix: backport-to-

      - name: Info log
        if: ${{ success() && fromJSON(steps.check_labels.outputs.matched) > 0 }}
        run: cat ~/.backport/backport.info.log

      - name: Debug log
        if: ${{ failure() && fromJSON(steps.check_labels.outputs.matched) > 0 }}
        run: cat ~/.backport/backport.debug.log