Dockerfile.backend

# SentinelFetal Backend Dockerfile
# Multi-stage build for Python FastAPI application

# ============================================================================
# Stage 1: Builder - Install dependencies
# ============================================================================
FROM python:3.12-slim as builder

WORKDIR /app

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

# Create virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Copy and install requirements
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# ============================================================================
# Stage 2: Runtime - Production image
# ============================================================================
FROM python:3.12-slim as runtime

WORKDIR /app

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Create non-root user for security
RUN useradd --create-home --shell /bin/bash appuser && \
    chown -R appuser:appuser /app

# Copy application code
COPY --chown=appuser:appuser api/ ./api/
COPY --chown=appuser:appuser src/ ./src/
COPY --chown=appuser:appuser models/ ./models/

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/api/health')" || exit 1

# Run the application
CMD ["uvicorn", "api.main:app", "--host", "0.0.0.0", "--port", "8000"]