name: CI & Deploy

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
  workflow_dispatch:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

env:
  PYTHON_VERSION: "3.12"
  NODE_VERSION: "20"

jobs:
  # ──────────────────────────────────────────────
  # Backend: test
  # ──────────────────────────────────────────────
  backend:
    name: Backend CI
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install uv
        run: curl -LsSf https://astral.sh/uv/install.sh | sh

      - name: Set up Python ${{ env.PYTHON_VERSION }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Cache uv
        uses: actions/cache@v4
        with:
          path: |
            ~/.local/share/uv
            ~/.cache/uv
          key: uv-${{ runner.os }}-py${{ env.PYTHON_VERSION }}-${{ hashFiles('backend/pyproject.toml', 'pyproject.toml') }}
          restore-keys: |
            uv-${{ runner.os }}-py${{ env.PYTHON_VERSION }}-

      - name: Install backend dependencies
        run: |
          export PATH="$HOME/.local/bin:$PATH"
          uv venv .venv
          source .venv/bin/activate
          uv pip install -e "./backend[dev]"
          uv pip install pytest httpx

      - name: Run backend tests
        run: |
          export PATH="$HOME/.local/bin:$PATH"
          source .venv/bin/activate
          cd backend
          python -m pytest visual_notebook/tests/ -v --tb=short

  # ──────────────────────────────────────────────
  # Frontend: build
  # ──────────────────────────────────────────────
  frontend:
    name: Frontend CI
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Node.js ${{ env.NODE_VERSION }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
          cache-dependency-path: frontend/package-lock.json

      - name: Install & Build
        working-directory: frontend
        run: npm ci && npm run build

  # ──────────────────────────────────────────────
  # Deploy to Hugging Face Spaces
  # ──────────────────────────────────────────────
  deploy:
    name: Deploy to HF Spaces
    needs: [backend, frontend]
    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to HF Container Registry
        uses: docker/login-action@v3
        with:
          registry: registry.hf.space
          username: ${{ secrets.HF_USERNAME }}
          password: ${{ secrets.HF_TOKEN }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          push: true
          tags: |
            registry.hf.space/${{ secrets.HF_SPACE_ID }}:latest
            registry.hf.space/${{ secrets.HF_SPACE_ID }}:${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Restart HF Space
        run: |
          curl -s -f -X POST \
            "https://huggingface.co/api/spaces/${{ secrets.HF_SPACE_ID }}/restart" \
            -H "Authorization: Bearer ${{ secrets.HF_TOKEN }}" \
            -H "Content-Type: application/json" \
            || echo "Restart request failed — image push should still trigger rebuild."