name: Auto PR (master → main)

on:
  push:
    branches: [master]

jobs:
  create-pr:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Create or update PR
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          EXISTING_PR=$(gh pr list --base main --head master --state open --json number --jq '.[0].number')

          if [ -n "$EXISTING_PR" ]; then
            echo "PR #$EXISTING_PR already exists — new commits will appear automatically"
          else
            echo "Creating new PR: master → main"
            gh pr create \
              --base main \
              --head master \
              --title "Sync: master → main" \
              --body "Automated PR to sync master branch changes to main.

          This PR was created automatically and will be merged once CI checks pass."
          fi
