name: Sync with BMAD-METHOD Upstream

on:
  schedule:
    - cron: '0 */12 * * *'  # Every 12 hours (BMAD updates frequently)
  workflow_dispatch:  # Manual trigger option

jobs:
  sync:
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout Fork
        uses: actions/checkout@v4
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          fetch-depth: 0
      
      - name: Configure Git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
      
      - name: Add Upstream and Sync
        run: |
          git remote add upstream https://github.com/bmad-code-org/BMAD-METHOD.git
          git fetch upstream
          git checkout main
          
          # Check if merge will have conflicts
          if git merge-tree $(git merge-base main upstream/main) main upstream/main | grep -q "^<<<<<<<"; then
            echo "⚠️ Merge conflicts detected, creating PR instead"
            BRANCH_NAME="sync-upstream-$(date +%Y%m%d-%H%M%S)"
            git checkout -b $BRANCH_NAME
            git merge upstream/main --no-edit || true
            git push origin $BRANCH_NAME
            echo "conflict=true" >> $GITHUB_ENV
            echo "branch=$BRANCH_NAME" >> $GITHUB_ENV
          else
            echo "✅ Clean merge, updating main"
            git merge upstream/main --no-edit
            git push origin main
            echo "conflict=false" >> $GITHUB_ENV
          fi
      
      - name: Create PR on Conflict
        if: env.conflict == 'true'
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: '🔄 Sync with BMAD-METHOD upstream (requires manual review)',
              head: process.env.branch,
              base: 'main',
              body: `## Upstream Sync with Conflicts
              
              Automated sync from [bmad-code-org/BMAD-METHOD](https://github.com/bmad-code-org/BMAD-METHOD) detected merge conflicts.
              
              **What happened:**
              - BMAD-METHOD has new updates
              - Your fork has changes that conflict with upstream
              
              **Next steps:**
              1. Review the conflicts in this PR
              2. Resolve conflicts locally or in the GitHub editor
              3. Merge when ready
              
              **Tip:** Consider keeping your customizations in a separate branch to make syncing easier.`
            });