name: Auto-create Release PR

on:
  push:
    branches:
      - 'release/**'

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

      - name: Create pull request
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          existing_pr_count="$(gh pr list \
            --state open \
            --base main \
            --head "${{ github.ref_name }}" \
            --json number \
            --jq 'length')"
          if [ "${existing_pr_count}" -gt 0 ]; then
            echo "Open pull request already exists for branch '${{ github.ref_name }}' into 'main'; skipping creation."
          else
            gh pr create \
              --title "$(git log -1 --pretty=%s)" \
              --body "Automated release PR." \
              --base main \
              --head "${{ github.ref_name }}"
          fi

      - name: Approve pull request
        env:
          # PAT stored in github/CopilotForXcode, with write permissions to pull requests
          GH_TOKEN: ${{ secrets.XCODE_AUTO_APPROVE }}
        run: |
          gh pr review --approve "${{ github.ref_name }}"

      - name: Auto-merge pull request
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh pr merge "${{ github.ref_name }}" \
            --auto \
            --delete-branch