FROM python:3.11-slim

ENV PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

WORKDIR /app

RUN apt-get update \
    && apt-get install -y --no-install-recommends gcc libpq-dev \
    && rm -rf /var/lib/apt/lists/*

COPY requirements.txt .
RUN pip install -r requirements.txt

COPY . .

ENV PORT=5051
EXPOSE 5051

# Run migrations on every start (idempotent), then gunicorn with gevent for SSE.
CMD ["sh", "-c", "alembic upgrade head && exec gunicorn web_app:app --bind 0.0.0.0:${PORT} --worker-class gevent --workers 1 --timeout 300 --access-logfile -"]