name: "PR Management Add Backport Labels"

on:
  workflow_run:
    workflows:
      - "PR Management Add Labels Collect Data"
    types: [completed]

jobs:
  add-require-backport-label:
    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-label-data
          run-id: ${{ github.event.workflow_run.id }}
          github-token: ${{ github.token }}

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

      - name: Add require-backport label (main branch PRs)
        if: env.PR_BASE_REF == 'main'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail

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

          release_branches=$(gh api "repos/${repo}/branches" --paginate --jq '.[].name' | grep -E '^release-harvester-v[0-9]+\.[0-9]+$' || true)

          if [[ -z "$release_branches" ]]; then
            echo "No release branches found, skipping."
            exit 0
          fi

          latest_branch=$(echo "$release_branches" | sort -Vr | head -n1)
          version="${latest_branch#release-harvester-v}"
          release_tag="v${version}.0"

          tags=$(gh api "repos/${repo}/releases" --paginate --jq '.[].tag_name')
          if echo "$tags" | grep -Fxq "$release_tag"; then
            echo "Release $release_tag already published, skipping."
            exit 0
          fi

          label="require backport/v${version}"
          pr_labels=$(gh pr view "$pr_number" --repo "$repo" --json labels --jq '.labels[].name' || echo "")

          if echo "$pr_labels" | grep -Fxq "$label"; then
            echo "Label '$label' already present, skipping."
            exit 0
          fi

          echo "Adding label: $label"
          gh pr edit "$pr_number" --repo "$repo" --add-label "$label"

      - name: Add backport label (release branch PRs opened by Mergify)
        if: startsWith(env.PR_BASE_REF, 'release-harvester-v')
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail

          IS_MERGIFY=$(echo "$PR_USER_LOGIN" | grep -iq 'mergify' && echo true || echo false)

          if [[ "$IS_MERGIFY" != "true" ]]; then
            echo "PR author is not Mergify, skipping."
            exit 0
          fi

          version="${PR_BASE_REF#release-harvester-v}"
          label="backport/v${version}"
          echo "Adding label: $label"
          gh pr edit "$PR_NUMBER" --repo "${{ github.repository }}" --add-label "$label"