name: Sync upstream

# Syncs upstream/master into this fork's master, then re-applies fork overrides
# for any upstream workflow files that should not run in the fork (docker.yml, release.yml).
# Triggers assemble-local.yml automatically via the master push.
#
# Run manually or on a schedule to keep master current with upstream.

on:
  schedule:
    - cron: '0 7 * * *'   # daily at 2am EST (UTC-5)
  workflow_dispatch:

permissions:
  contents: write

jobs:
  sync:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - name: Checkout master
        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: Fetch upstream
        run: |
          git remote add upstream https://github.com/paperclipai/paperclip.git 2>/dev/null || true
          git fetch upstream

      - name: Fast-forward master to upstream
        run: |
          git merge --ff-only upstream/master || {
            echo "::error::Cannot fast-forward master to upstream/master — diverged history"
            echo "::error::Resolve manually: git fetch upstream && git rebase upstream/master"
            exit 1
          }

      - name: Re-apply fork workflow overrides
        run: |
          # These files are overridden in the fork to prevent upstream workflows from
          # running on fork pushes. Re-apply after each upstream sync.
          OVERRIDE_FILES=(
            ".github/workflows/docker.yml"
            ".github/workflows/release.yml"
          )
          changed=false
          for f in "${OVERRIDE_FILES[@]}"; do
            fork_version=$(git show origin/master:"$f" 2>/dev/null || true)
            current=$(cat "$f" 2>/dev/null || true)
            if [ "$fork_version" != "$current" ]; then
              echo "Re-applying fork override: $f"
              git checkout origin/master -- "$f"
              changed=true
            fi
          done
          if [ "$changed" = true ]; then
            git add "${OVERRIDE_FILES[@]}"
            git commit -m "chore(ci): re-apply fork workflow overrides after upstream sync"
          fi

      - name: Push master
        run: git push origin master