# This action creates downstream PRs for PRs with backport labels defined.
# See docs here: https://github.com/hashicorp/backport-assistant

name: Backport Assistant Runner

on:
  pull_request_target:
    types:
      - closed
      - labeled
    branches:
      - main
      - 'release/*.*.x'

jobs:
  backport:
    if: github.event.pull_request.merged
    runs-on: ubuntu-latest
    container: hashicorpdev/backport-assistant:0.3.0
    steps:
      - name: Run Backport Assistant for stable-website
        run: |
          backport-assistant backport -merge-method=squash -gh-automerge
        env:
          BACKPORT_LABEL_REGEXP: "type/docs-(?P<target>cherrypick)"
          BACKPORT_TARGET_TEMPLATE: "stable-website"
          BACKPORT_MERGE_COMMIT: true
          GITHUB_TOKEN: ${{ secrets.ELEVATED_GITHUB_TOKEN }}
      - name: Backport changes to latest release branch
        run: |
          # Use standard token here 
          resp=$(curl -f -s -H 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' "https://api.github.com/repos/$GITHUB_REPOSITORY/labels?per_page=100")
          ret="$?"
          if [[ "$ret" -ne 0 ]]; then
              echo "The GitHub API returned $ret"
              exit $ret
          fi
          # get the latest backport label excluding any website labels, ex: `backport/0.3.x` and not `backport/website`
          latest_backport_label=$(echo "$resp" | jq -r '.[] | select(.name | (startswith("backport/") and (contains("website") | not))) | .name' | sort -rV | head -n1)
          echo "Latest backport label: $latest_backport_label"
          # set BACKPORT_TARGET_TEMPLATE for backport-assistant
          # trims backport/ from the beginning with parameter substitution
          export BACKPORT_TARGET_TEMPLATE="release/${latest_backport_label#backport/}.x"
          backport-assistant backport -merge-method=squash -gh-automerge
        env:
          BACKPORT_LABEL_REGEXP: "type/docs-(?P<target>cherrypick)"
          GITHUB_TOKEN: ${{ secrets.ELEVATED_GITHUB_TOKEN }}
      - name: Run Backport Assistant for release branches
        run: |
          backport-assistant backport -merge-method=squash -gh-automerge
        env:
          BACKPORT_LABEL_REGEXP: "backport/(?P<target>\\d+\\.\\d+)"
          BACKPORT_TARGET_TEMPLATE: "release/{{.target}}.x"
          GITHUB_TOKEN: ${{ secrets.ELEVATED_GITHUB_TOKEN }}