# Multi-stage to keep the runtime image small.
# build123d pulls scipy + matplotlib + OCP wheel — a few hundred MB.

FROM python:3.12-slim AS builder

ENV PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

RUN apt-get update && apt-get install -y --no-install-recommends \
        build-essential libgl1 libglu1-mesa libxrender1 libxext6 libsm6 \
        libgomp1 \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY requirements.txt .
RUN pip install --user -r requirements.txt && \
    pip install --user gunicorn

# ---------------------------------------------------------------------------

FROM python:3.12-slim AS runtime

# OCP runtime libs + openscad (subprocess for /api/holder/render).
# openscad headless renders STL from .scad with parameter overrides via -D.
RUN apt-get update && apt-get install -y --no-install-recommends \
        libgl1 libglu1-mesa libxrender1 libxext6 libsm6 libgomp1 \
        openscad xvfb \
    && rm -rf /var/lib/apt/lists/* \
    && useradd --create-home --shell /usr/sbin/nologin app

COPY --from=builder /root/.local /home/app/.local
ENV PATH=/home/app/.local/bin:$PATH \
    PYTHONUNBUFFERED=1 \
    HOST=0.0.0.0 \
    PORT=5000 \
    FLASK_DEBUG=0

WORKDIR /app
COPY --chown=app:app app.py busbar_export.py ./
COPY --chown=app:app static/ ./static/

USER app
EXPOSE 5000

# SQLite DB lives here; mount as a volume to persist across container restarts.
ENV BUSBAR_DB=/app/data/busbar.db
VOLUME /app/data

# 2 workers is plenty — each export is CPU-bound on OpenCASCADE; more workers
# don't help on a single-socket VM and just balloon RAM.
CMD ["gunicorn", "--bind=0.0.0.0:5000", "--workers=2", "--threads=2", \
     "--timeout=120", "app:app"]