name: CI - Build & Test

# Run on all pushes and pull requests to catch build errors early
on:
  push:
    branches:
      - main
      - develop
      - huggingface-deploy  # Test deploy branch before HF build
  pull_request:
    branches:
      - main
      - develop

jobs:
  # Test 1: Frontend TypeScript Build
  frontend-build:
    name: Frontend Build (TypeScript + Vite)
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
          cache-dependency-path: frontend/package-lock.json

      - name: Install frontend dependencies
        run: |
          cd frontend
          npm ci

      - name: Run TypeScript type check
        run: |
          cd frontend
          npx tsc --noEmit

      - name: Build frontend
        run: |
          cd frontend
          npm run build

      - name: Check build artifacts
        run: |
          if [ ! -d "frontend/dist" ]; then
            echo "❌ Frontend build failed - no dist directory"
            exit 1
          fi
          echo "✅ Frontend build successful"

  # Test 2: Documentation Site Build
  # CRITICAL: This catches Docusaurus config errors (like duplicate gtag) before HuggingFace deployment
  docs-build:
    name: Documentation Build (Docusaurus)
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
          cache-dependency-path: website/package-lock.json

      - name: Install docs dependencies
        run: |
          cd website
          npm ci

      - name: Build documentation
        run: |
          cd website
          npm run build

      - name: Check build artifacts
        run: |
          if [ ! -d "website/build" ]; then
            echo "❌ Docs build failed - no build directory"
            exit 1
          fi
          echo "✅ Documentation build successful"

  # Test 3: Python Backend
  backend-test:
    name: Backend Tests (Python)
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'
          cache: 'pip'

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt

      - name: Check Python syntax
        run: |
          python -m py_compile main.py
          find api -name "*.py" -exec python -m py_compile {} \;
          echo "✅ Python syntax check passed"

      - name: Import test
        run: |
          python -c "import main; print('✅ Main module imports successfully')"
          python -c "from api.app import app; print('✅ API app imports successfully')"

  # Test 4: Docker Build (Full Integration Test)
  docker-build:
    name: Docker Build Test (Full Stack)
    runs-on: ubuntu-latest
    needs: [frontend-build, docs-build, backend-test]
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

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

      - name: Build Docker image (no push)
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile.huggingface
          push: false
          tags: test-build:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Report success
        run: |
          echo "✅ All builds passed!"
          echo "✅ Frontend: TypeScript + Vite"
          echo "✅ Documentation: Docusaurus"
          echo "✅ Backend: Python imports"
          echo "✅ Docker: Full stack build"