name: Deploy to Hugging Face Space

on:
    push:
        branches: [main]
    workflow_dispatch:

# Allow only one deploy at a time; cancel older in-progress runs.
concurrency:
    group: deploy-hf
    cancel-in-progress: true

jobs:
    deploy:
        runs-on: ubuntu-latest
        steps:
            - name: Checkout (full history)
              uses: actions/checkout@v4
              with:
                  fetch-depth: 0

            - name: Set up Node
              uses: actions/setup-node@v4
              with:
                  node-version: "20"
                  cache: npm
                  cache-dependency-path: frontend/package-lock.json

            # The HF Space uses the Gradio SDK (Python only) and won't run npm.
            # Build the Three.js bundle here and commit it so the Space gets the
            # static assets it serves from frontend/dist/.
            - name: Build frontend bundle
              working-directory: frontend
              run: |
                  npm ci
                  npm run build

            - name: Commit built bundle for the Space
              run: |
                  git config user.name "github-actions[bot]"
                  git config user.email "github-actions[bot]@users.noreply.github.com"
                  git add -f frontend/dist
                  git commit -m "ci: build frontend bundle for HF Space" || echo "No changes to commit"

            - name: Push to Hugging Face Space
              env:
                  HF_TOKEN: ${{ secrets.HF_TOKEN }}
                  # e.g. "your-username/your-space-name"
                  HF_SPACE_ID: ${{ secrets.HF_SPACE_ID }}
              run: |
                  if [ -z "$HF_TOKEN" ] || [ -z "$HF_SPACE_ID" ]; then
                    echo "::error::HF_TOKEN secret and HF_SPACE_ID secret must be set."
                    exit 1
                  fi
                  git push --force \
                    "https://github-actions:${HF_TOKEN}@huggingface.co/spaces/${HF_SPACE_ID}.git" \
                    HEAD:main