name: CI

on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main]

jobs:
  # ── Backend Tests ─────────────────────────────────────────────────────────
  backend:
    name: Backend Tests
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Python 3.10
        uses: actions/setup-python@v5
        with:
          python-version: "3.10"
          cache: pip

      - name: Install CI dependencies (lightweight subset)
        run: |
          pip install --upgrade pip
          pip install \
            opencv-python-headless==4.9.0.80 \
            numpy==1.26.4 \
            Pillow==10.3.0 \
            scipy==1.13.0 \
            scikit-image==0.23.2 \
            flask==3.0.3 \
            flask-cors==4.0.1 \
            python-dotenv==1.0.1 \
            onnxruntime==1.19.2 \
            pytest==8.2.0

      - name: Run tests
        run: python -m pytest tests/ -v --tb=short

  # ── Frontend Build ────────────────────────────────────────────────────────
  frontend:
    name: Frontend Build
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

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

      - name: Install dependencies
        working-directory: frontend
        run: npm ci --silent

      - name: Build React app
        working-directory: frontend
        run: npm run build

      - name: Upload React build artifact
        uses: actions/upload-artifact@v4
        with:
          name: react-build
          path: static/react/
          retention-days: 7