name: Auto-request Copilot review

on:
  pull_request:
    types: [opened, reopened, ready_for_review]

permissions:
  pull-requests: write

jobs:
  request:
    if: github.event.pull_request.draft == false
    runs-on: ubuntu-latest
    timeout-minutes: 2
    steps:
      - name: Request Copilot reviewer
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
        run: |
          set -e
          if gh api "repos/${{ github.repository }}/pulls/$PR_NUMBER" \
              --jq '.requested_reviewers[].login' \
              | grep -qE '^(Copilot|copilot-pull-request-reviewer\[bot\])$'; then
            echo "Copilot already requested as reviewer."
            exit 0
          fi
          # 422 here usually means Copilot has already submitted a review (so the
          # request slot is gone). Treat that as benign.
          if ! resp=$(gh api -X POST \
              "repos/${{ github.repository }}/pulls/$PR_NUMBER/requested_reviewers" \
              -f 'reviewers[]=copilot-pull-request-reviewer[bot]' 2>&1); then
            echo "$resp"
            if echo "$resp" | grep -q '"status":"422"'; then
              echo "POST returned 422; Copilot likely already reviewed."
              exit 0
            fi
            exit 1
          fi