#!/bin/sh
set -e

FIFO=/audio/stream.fifo
ICECAST_HOST=${ICECAST_HOST:-icecast}
ICECAST_PORT=${ICECAST_PORT:-8000}
ICECAST_PASSWORD=${ICECAST_SOURCE_PASSWORD:-groove_source}
MOUNT=${ICECAST_MOUNT:-/stream.flac}

until [ -p "$FIFO" ]; do
    echo "[stream-relay] Waiting for $FIFO..."
    sleep 2
done

# Open FIFO with O_RDWR so Mopidy's GStreamer filesink never blocks on open().
# A write-only open blocks until a reader exists; by holding the FIFO open
# O_RDWR here, the write side can proceed immediately at any time.
exec 5<>"$FIFO"

echo "[stream-relay] FIFO open. Encoding PCM → FLAC → icecast://${ICECAST_HOST}:${ICECAST_PORT}${MOUNT}"

ICECAST_URL="icecast://source:${ICECAST_PASSWORD}@${ICECAST_HOST}:${ICECAST_PORT}${MOUNT}"

while true; do
    ffmpeg -nostdin \
        -f s16le -ar 48000 -ac 2 \
        -i "$FIFO" \
        -vn \
        -c:a flac \
        -compression_level 0 \
        -f flac \
        -content_type audio/flac \
        "$ICECAST_URL" 2>&1 || true
    echo "[stream-relay] ffmpeg exited — reconnecting in 3s..."
    sleep 3
done