name: Labeller
on:
  pull_request_target:
    types: closed

jobs:
  label:

    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write

    steps:
      - uses: actions/checkout@v4
        with:
          sparse-checkout: .github/scripts
      - name: Add release labels on merge
        run: |
          PR_NUMBER="${{ github.event.pull_request.number }}"
          
          echo "Base REF:   $GITHUB_BASE_REF"
          echo "**Branch:** [$GITHUB_BASE_REF](https://github.com/$GITHUB_REPOSITORY/tree/$GITHUB_BASE_REF)" >> $GITHUB_STEP_SUMMARY
          echo "PR:         https://github.com/$GITHUB_REPOSITORY/pull/$PR_NUMBER"
          echo "**PR:** [$PR_NUMBER](https://github.com/$GITHUB_REPOSITORY/pull/$PR_NUMBER)" >> $GITHUB_STEP_SUMMARY
          
          if [ "$GITHUB_BASE_REF" == "main" ]; then
            LAST_MAJOR="$(gh api /repos/$GITHUB_REPOSITORY/branches --paginate --jq .[].name | grep '^release/' | cut -d '/' -f 2 | cut -d '.' -f 1 | sort -n -r | head -n 1)"
            NEXT_MAJOR="$(($LAST_MAJOR + 1))"
            LABEL="release/$NEXT_MAJOR.0.0"
            BACKPORT_LABEL="backport/main"
          elif [[ "$GITHUB_BASE_REF" = release/* ]]; then
            MAJOR_MINOR="$(echo $GITHUB_BASE_REF | cut -d '/' -f 2)"
            LAST_MICRO="$(gh api /repos/$GITHUB_REPOSITORY/tags --jq .[].name | sort -V -r | grep $MAJOR_MINOR | head -n 1 | cut -d '.' -f 3)"
            NEXT_MICRO="$(($LAST_MICRO + 1))"
            LABEL="release/$MAJOR_MINOR.$NEXT_MICRO"
            BACKPORT_LABEL="backport/$MAJOR_MINOR"
          fi
          
          echo "Label:      $LABEL"
          echo "**Label:** [$LABEL](https://github.com/$GITHUB_REPOSITORY/labels/$(echo $LABEL | sed 's|/|%2F|g'))" >> $GITHUB_STEP_SUMMARY
          
          gh api "repos/$GITHUB_REPOSITORY/labels/$(echo $LABEL | sed 's|/|%2F|g')" --silent 2>/dev/null || gh label create -R "$GITHUB_REPOSITORY" "$LABEL" -c "0E8A16"
          
          echo ""
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "Updating issues:"
          echo "**Updating issues:**" >> $GITHUB_STEP_SUMMARY
          
          ISSUES=$(.github/scripts/pr-find-issues.sh "$PR_NUMBER" "$GITHUB_REPOSITORY")
          for ISSUE in $ISSUES; do
            gh issue edit "$ISSUE" -R "$GITHUB_REPOSITORY" --add-label "$LABEL" --remove-label "$BACKPORT_LABEL"
            echo "* [$ISSUE](https://github.com/$GITHUB_REPOSITORY/issues/$ISSUE)" >> $GITHUB_STEP_SUMMARY
          done
        if: github.repository	== 'keycloak/keycloak' && github.event_name == 'pull_request_target' && github.event.action == 'closed' && github.event.pull_request.merged == true
        env:
          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"