FROM python:3.11-slim AS builder

WORKDIR /app

# Install dependencies and build wheel
COPY pyproject.toml requirements.txt ./
RUN pip install --no-cache-dir --prefix=/install -r requirements.txt

# Final production stage
FROM python:3.11-slim

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PORT=8080

WORKDIR /app

# Create non-root user for security
RUN groupadd -g 10001 appgroup && \
    useradd -u 10001 -g appgroup -s /bin/sh -m appuser

# Copy installed dependencies and application code
COPY --from=builder /install /usr/local
COPY . .

RUN chown -R appuser:appgroup /app

USER appuser

EXPOSE 8080

HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
  CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8080/health')" || exit 1

CMD ["python", "-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8080"]