name: Sync main and master branches

on:
  push:
    branches:
      - main
      - master

jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Setup Git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Sync branches
        run: |
          # Get the branch that was pushed to
          PUSHED_BRANCH="${GITHUB_REF#refs/heads/}"

          if [ "$PUSHED_BRANCH" = "main" ]; then
            TARGET_BRANCH="master"
          else
            TARGET_BRANCH="main"
          fi

          echo "Syncing $PUSHED_BRANCH → $TARGET_BRANCH"

          git fetch origin $TARGET_BRANCH || git checkout -b $TARGET_BRANCH
          git checkout $TARGET_BRANCH
          git merge origin/$PUSHED_BRANCH --no-edit -m "Sync from $PUSHED_BRANCH"
          git push origin $TARGET_BRANCH