Dockerfile.render

# Multi-stage Dockerfile optimized for Render.com deployment
FROM python:3.11-slim as backend-builder

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

# Install system dependencies for building
RUN apt-get update && apt-get install -y \
    build-essential \
    libpq-dev \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Set work directory
WORKDIR /app

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

# Copy backend code
COPY backend/ ./backend/
COPY .env.example .env

# Production stage
FROM python:3.11-slim as production

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    libpq5 \
    && rm -rf /var/lib/apt/lists/*

# Create non-root user
RUN useradd --create-home --shell /bin/bash app

# Set work directory
WORKDIR /app

# Copy installed packages from builder
COPY --from=backend-builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
COPY --from=backend-builder /usr/local/bin /usr/local/bin

# Copy application code
COPY --from=backend-builder /app/backend ./backend
COPY --from=backend-builder /app/.env .env

# Change ownership to app user
RUN chown -R app:app /app
USER app

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:8000/health')" || exit 1

# Start command
CMD ["sh", "-c", "cd backend && uvicorn app.main:app --host 0.0.0.0 --port ${PORT:-8000}"]