FROM python:3.9.2-slim

ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Install minimal build deps (kept small). Adjust if your requirements need additional system packages.
RUN sed -i 's|http://deb.debian.org/debian|http://archive.debian.org/debian|g' /etc/apt/sources.list \
    || true \
    && sed -i 's|http://security.debian.org/debian-security|http://archive.debian.org/debian-security|g' /etc/apt/sources.list \
    || true \
    && echo 'Acquire::Check-Valid-Until "false";' > /etc/apt/apt.conf.d/99no-check-valid-until \
    && apt-get update \
    && apt-get install -y --no-install-recommends gcc ca-certificates \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Copy only requirements first to leverage Docker cache
COPY requirements.txt /app/requirements.txt

RUN pip install --upgrade pip \
    && pip install --no-cache-dir -r /app/requirements.txt

# By default the container runs Python; pass a script name or `-m` args after the image name.
ENTRYPOINT ["python3"]

# Recommended working directory for runs
CMD ["-V"]