FROM librespace/gnuradio:latest

# PulseAudio client + ALSA-PulseAudio plugin for audio output
# GNU Radio uses ALSA backend, so we bridge ALSA → PulseAudio
RUN apt-get update && apt-get install -y --no-install-recommends \
    pulseaudio-utils \
    libpulse0 \
    libasound2-plugins \
    alsa-utils \
    && rm -rf /var/lib/apt/lists/*

# Configure ALSA to use PulseAudio as default output
# This makes any ALSA app (including GNU Radio) output to PulseAudio
RUN echo 'pcm.!default { type pulse }' > /etc/asound.conf && \
    echo 'ctl.!default { type pulse }' >> /etc/asound.conf

# Create non-root user for PulseAudio (matches typical host UID)
ARG USER_ID=1000
ARG GROUP_ID=1000
RUN groupadd -g ${GROUP_ID} gnuradio || true \
    && useradd -m -u ${USER_ID} -g ${GROUP_ID} gnuradio || true

WORKDIR /flowgraphs

# PulseAudio socket location
ENV PULSE_SERVER=unix:/run/pulse/native

# XML-RPC port for runtime control
ENV XMLRPC_PORT=8090
EXPOSE 8090

USER gnuradio

# Default: run a flowgraph passed as argument
ENTRYPOINT ["python3"]