wylab-station-14/.github/workflows/upstream-sync.yml

name: Upstream Sync

on:
  schedule:
    - cron: '0 6 * * *'  # Daily at 6am UTC
  workflow_dispatch:  # Manual trigger

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

    - 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 remote
      run: |
        git remote add syndicate https://github.com/space-syndicate/space-station-14.git
        git fetch syndicate master

    - name: Check for upstream updates
      id: check
      run: |
        BEHIND=$(git rev-list HEAD..syndicate/master --count)
        echo "behind=$BEHIND" >> $GITHUB_OUTPUT
        if [ "$BEHIND" -gt 0 ]; then
          echo "Upstream has $BEHIND new commits"
          echo "has_updates=true" >> $GITHUB_OUTPUT
        else
          echo "Already up to date"
          echo "has_updates=false" >> $GITHUB_OUTPUT
        fi

    - name: Rebase onto upstream
      if: steps.check.outputs.has_updates == 'true'
      id: rebase
      run: |
        # Create sync branch
        git checkout -b upstream-sync

        # Try rebase
        if git rebase syndicate/master; then
          echo "rebase_success=true" >> $GITHUB_OUTPUT
          git push -f origin upstream-sync
        else
          git rebase --abort
          echo "rebase_success=false" >> $GITHUB_OUTPUT
        fi

    - name: Create PR for CI verification
      if: steps.check.outputs.has_updates == 'true' && steps.rebase.outputs.rebase_success == 'true'
      uses: actions/github-script@v7
      with:
        script: |
          const behind = '${{ steps.check.outputs.behind }}';

          // Check if PR already exists
          const { data: prs } = await github.rest.pulls.list({
            owner: context.repo.owner,
            repo: context.repo.repo,
            head: `${context.repo.owner}:upstream-sync`,
            state: 'open'
          });

          if (prs.length > 0) {
            console.log('PR already exists, skipping creation');
            return;
          }

          // Create PR
          await github.rest.pulls.create({
            owner: context.repo.owner,
            repo: context.repo.repo,
            title: `Upstream sync: ${behind} new commits from syndicate/master`,
            head: 'upstream-sync',
            base: 'master',
            body: `Automatic rebase of wylab commits onto updated syndicate/master.\n\n**${behind} new upstream commits**\n\nThis PR will be auto-merged when CI passes.`
          });

    - name: Create issue on rebase conflict
      if: steps.check.outputs.has_updates == 'true' && steps.rebase.outputs.rebase_success == 'false'
      uses: actions/github-script@v7
      with:
        script: |
          const behind = '${{ steps.check.outputs.behind }}';
          await github.rest.issues.create({
            owner: context.repo.owner,
            repo: context.repo.repo,
            title: `Upstream sync failed - ${behind} commits behind`,
            body: `Automatic rebase onto syndicate/master failed due to conflicts.\n\nManual intervention required:\n\`\`\`bash\ngit fetch syndicate\ngit rebase syndicate/master\n# resolve conflicts\ngit push --force-with-lease origin master\n\`\`\``,
            labels: ['upstream-sync', 'needs-attention']
          });