auto-push-main.yml

name: Auto Push to Main

on:
  push:
    branches: [testing]

permissions:
  contents: write
  pull-requests: write

jobs:
  lint-test-merge:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0          # needed for ahead/behind check

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.x'

      - name: Install dependencies
        run: pip install -e ".[dev]"

      - name: Lint (ruff)
        run: ruff check .

      - name: Tests (pytest)
        run: pytest tests/ -v

      - name: Check if testing is ahead of main
        id: ahead_check
        run: |
          git fetch origin main
          AHEAD=$(git rev-list origin/main..HEAD --count)
          echo "ahead=$AHEAD" >> "$GITHUB_OUTPUT"

      - name: Create PR (testing → main)
        if: steps.ahead_check.outputs.ahead != '0'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh pr create \
            --base main \
            --head testing \
            --title "Auto-merge: testing → main (run #${{ github.run_number }})" \
            --body "Automatically created by **Auto Push to Main** workflow after lint and tests passed on the \`testing\` branch." \
          || echo "PR already exists — will merge existing PR"

      - name: Merge PR into main
        if: steps.ahead_check.outputs.ahead != '0'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: gh pr merge testing --merge --delete-branch=false