name: Backend CI
on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main ]

jobs:
  backend:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: ["3.9", "3.10", "3.11"]
    steps:
    - uses: actions/checkout@v4
    - name: Setup Python ${{ matrix.python-version }}
      uses: actions/setup-python@v4
      with:
        python-version: ${{ matrix.python-version }}
    - name: Cache pip
      uses: actions/cache@v3
      with:
        path: ~/.cache/pip
        key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml', 'requirements.txt') }}
        restore-keys: |
          ${{ runner.os }}-pip-
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install -e ".[dev]"
    - name: Lint with flake8
      run: |
        flake8 app/ tests/
    - name: Type check with mypy
      run: |
        mypy app/
    - name: Run tests with coverage
      run: |
        python -m pytest --cov --cov-report=xml --cov-report=term-missing
    - name: Upload coverage to Codecov
      uses: codecov/codecov-action@v3
      with:
        file: ./coverage.xml
        flags: unittests
        name: codecov-umbrella
        fail_ci_if_error: false

  deploy:
    runs-on: ubuntu-latest
    needs: backend
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          lfs: true
          
      - name: Debug - Check secrets are set
        run: |
          echo "Checking if secrets are available..."
          if [ -z "${{ secrets.HF_TOKEN }}" ]; then
            echo "❌ HF_TOKEN is NOT set!"
          else
            echo "✅ HF_TOKEN is set (length: ${{ secrets.HF_TOKEN != '' && 'yes' || 'no' }})"
          fi
          
          if [ -z "${{ secrets.HF_USERNAME }}" ]; then
            echo "❌ HF_USERNAME is NOT set!"
          else
            echo "✅ HF_USERNAME is set"
          fi
          
          if [ -z "${{ secrets.HF_SPACE_NAME }}" ]; then
            echo "❌ HF_SPACE_NAME is NOT set!"
          else
            echo "✅ HF_SPACE_NAME is set"
          fi
          
      - name: Verify Space Configuration
        env:
          HF_TOKEN: ${{ secrets.HF_TOKEN }}
          HF_USERNAME: ${{ secrets.HF_USERNAME }}
          HF_SPACE_NAME: ${{ secrets.HF_SPACE_NAME }}
        run: |
          set +e  # Don't exit on error in this step
          
          echo "=== Space Configuration Check ==="
          
          # Check if variables are set
          if [ -z "$HF_USERNAME" ]; then
            echo "❌ ERROR: HF_USERNAME is empty!"
            echo "Please add HF_USERNAME secret in GitHub Settings > Secrets > Actions"
            exit 1
          fi
          
          if [ -z "$HF_SPACE_NAME" ]; then
            echo "❌ ERROR: HF_SPACE_NAME is empty!"
            echo "Please add HF_SPACE_NAME secret in GitHub Settings > Secrets > Actions"
            exit 1
          fi
          
          if [ -z "$HF_TOKEN" ]; then
            echo "❌ ERROR: HF_TOKEN is empty!"
            echo "Please add HF_TOKEN secret in GitHub Settings > Secrets > Actions"
            exit 1
          fi
          
          echo "✅ All secrets are set"
          echo ""
          echo "String lengths:"
          echo "  HF_USERNAME: ${#HF_USERNAME} characters"
          echo "  HF_SPACE_NAME: ${#HF_SPACE_NAME} characters"
          echo "  HF_TOKEN: ${#HF_TOKEN} characters"
          echo ""
          
          # Check for common issues
          if [[ "$HF_USERNAME" =~ ^[[:space:]] ]] || [[ "$HF_USERNAME" =~ [[:space:]]$ ]]; then
            echo "⚠️  WARNING: HF_USERNAME has leading or trailing spaces!"
          fi
          
          if [[ "$HF_SPACE_NAME" =~ ^[[:space:]] ]] || [[ "$HF_SPACE_NAME" =~ [[:space:]]$ ]]; then
            echo "⚠️  WARNING: HF_SPACE_NAME has leading or trailing spaces!"
          fi
          
          # Test API access
          echo ""
          echo "Testing Hugging Face API access..."
          HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" \
            -H "Authorization: Bearer ${HF_TOKEN}" \
            "https://huggingface.co/api/spaces/${HF_USERNAME}/${HF_SPACE_NAME}")
          
          echo "API Response: $HTTP_CODE"
          
          case $HTTP_CODE in
            200)
              echo "✅ Space found and accessible!"
              ;;
            404)
              echo "❌ Space not found (404)"
              echo ""
              echo "Troubleshooting steps:"
              echo "1. Verify your space exists on Hugging Face"
              echo "2. Check the URL format: https://huggingface.co/spaces/USERNAME/SPACE-NAME"
              echo "3. Ensure HF_USERNAME matches your Hugging Face username exactly (case-sensitive)"
              echo "4. Ensure HF_SPACE_NAME matches your space name exactly (case-sensitive)"
              exit 1
              ;;
            401|403)
              echo "❌ Authentication failed ($HTTP_CODE)"
              echo ""
              echo "Token may be invalid or expired. Please:"
              echo "1. Go to https://huggingface.co/settings/tokens"
              echo "2. Create a new token with 'write' permissions"
              echo "3. Update the HF_TOKEN secret in GitHub"
              exit 1
              ;;
            *)
              echo "⚠️  Unexpected response: $HTTP_CODE"
              echo "Proceeding anyway..."
              ;;
          esac
          
          echo "===================================="
          
      - name: Deploy to Hugging Face Space
        env:
          HF_TOKEN: ${{ secrets.HF_TOKEN }}
          HF_USERNAME: ${{ secrets.HF_USERNAME }}
          HF_SPACE_NAME: ${{ secrets.HF_SPACE_NAME }}
        run: |
          # Configure Git
          git config --global user.email "github-actions[bot]@users.noreply.github.com"
          git config --global user.name "github-actions[bot]"
          
          # Set up the remote URL with authentication
          SPACE_URL="https://${HF_USERNAME}:${HF_TOKEN}@huggingface.co/spaces/${HF_USERNAME}/${HF_SPACE_NAME}"
          
          # Remove existing remote if present
          git remote remove space 2>/dev/null || true
          
          # Add the Hugging Face Space as a remote
          git remote add space "${SPACE_URL}"
          
          # Try to fetch from the space
          echo "Fetching from Hugging Face Space..."
          if git fetch space 2>&1 | tee /tmp/fetch_output.txt; then
            echo "✅ Fetch successful"
          else
            if grep -q "Repository not found" /tmp/fetch_output.txt; then
              echo "❌ Repository not found - this usually means:"
              echo "   1. The space doesn't exist"
              echo "   2. The username or space name is incorrect"
              echo "   3. The space is private and the token doesn't have access"
              exit 1
            fi
            echo "⚠️  Fetch failed, but continuing (may be first push)"
          fi
          
          # Push to the space
          echo ""
          echo "Pushing to Hugging Face Space..."
          if git push space HEAD:main --force; then
            echo ""
            echo "✅ Successfully deployed!"
            echo "🚀 View your space at: https://huggingface.co/spaces/${HF_USERNAME}/${HF_SPACE_NAME}"
          else
            echo ""
            echo "❌ Push failed!"
            exit 1
          fi