Dockerfile

# Multi-stage Dockerfile for ExplainGrade AI
FROM python:3.11-slim as builder

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommend \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements and install Python dependencies
COPY requirements.txt .
RUN pip install --user --no-cache-dir -r requirements.txt

# Download spaCy model
RUN python -m spacy download en_core_web_sm

# Production stage
FROM python:3.11-slim

WORKDIR /app

# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommend \
    libgomp1 \
    && rm -rf /var/lib/apt/lists/*

# Copy Python dependencies from builder
COPY --from=builder /root/.local /root/.local
COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages

# Set environment variables
ENV PATH=/root/.local/bin:$PATH \
    PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1

# Copy application code
COPY local_grader.py .
COPY src/ ./src/
COPY requirements.txt .

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import sys; print('OK')" || exit 1

# Default command
CMD ["python", "local_grader.py"]