# ── builder ──────────────────────────────────────────────────────────────────
FROM python:3.12-slim AS builder

WORKDIR /build

COPY services/ws-gateway/requirements.txt ./requirements.txt
RUN pip install --upgrade pip && \
    pip install --no-cache-dir --prefix=/install -r requirements.txt

# ── runtime ──────────────────────────────────────────────────────────────────
FROM python:3.12-slim AS runtime

RUN addgroup --system appgroup && adduser --system --ingroup appgroup appuser

WORKDIR /app

COPY --from=builder /install /usr/local

# Shared module
COPY shared/ shared/

# Service source
COPY services/ws-gateway/app/ app/

RUN chown -R appuser:appgroup /app

USER appuser

EXPOSE 8000

# Single worker — each instance handles many WS connections via asyncio
CMD ["gunicorn", "app.main:app", \
     "-k", "uvicorn.workers.UvicornWorker", \
     "--bind", "0.0.0.0:8000", \
     "--workers", "1", \
     "--timeout", "0"]