#!/bin/sh
# Prepare the radio volumes so radio_conjurer.liq boots on a fresh VM, then
# start (or point at) PulseAudio and exec liquidsoap. Existing files are never
# overwritten - live-edited script/params/playlists always win.
set -e

DATA="${RADIO_DATA_DIR:-/home/pi/Conjurer}"
MUSIC="${RADIO_MUSIC_DIR:-/home/pi/MediaFolder/mp3}"
mkdir -p "$DATA" "$MUSIC"

# Seed the script + persistent interactive params from the image on first run.
[ -e "$DATA/radio_conjurer.liq" ] || cp /app/radio_conjurer.liq "$DATA/"
if [ ! -e "$DATA/script.params" ]; then
    if [ -e /app/script.params ]; then cp /app/script.params "$DATA/"; else : > "$DATA/script.params"; fi
fi

# Playlists + logs the script watches/writes; empty files keep it happy until
# the musician/betoniarka populate them.
for f in all_playlist.playlist priority_queue.playlist hit.playlist \
         request.playlist jingles.playlist persistence.log; do
    [ -e "$DATA/$f" ] || : > "$DATA/$f"
done

# Icecast credentials are a secret - never baked into the image. Seed a
# placeholder so the script can parse the JSON, but shout about it.
if [ ! -e "$DATA/icecast_credentials.json" ]; then
    printf '{\n"password" : "CHANGE_ME"\n}\n' > "$DATA/icecast_credentials.json"
    echo "WARNING: seeded placeholder icecast_credentials.json - the icecast" >&2
    echo "         output will be rejected until you set the real password!" >&2
fi

# single() aborts the whole script when its file is missing; guarantee the
# emergency fallback exists (5s of silence beats a dead radio).
EMERGENCY="$MUSIC/Youtube/Dr. Peacock - Trip to Ireland [GvrvQTUbUcA].mp3"
if [ ! -e "$EMERGENCY" ]; then
    mkdir -p "$MUSIC/Youtube"
    if ffmpeg -loglevel error -f lavfi -i anullsrc=r=44100:cl=stereo -t 5 \
              -codec:a libmp3lame -q:a 9 "$EMERGENCY"; then
        echo "WARNING: emergency track was missing - generated silent placeholder" >&2
    else
        echo "WARNING: could not create emergency track; single() may abort" >&2
    fi
fi

# PulseAudio wiring:
#   internal (default) - system-wide pulse inside the container with a null
#                        sink (see /etc/pulse/system.pa); no sound hardware
#                        needed, mic path reads silence.
#   host               - use a socket mounted from the host; set PULSE_SERVER
#                        (e.g. unix:/tmp/pulseaudio.socket) in the env file.
#   none               - you edited the script to drop pulse in/out.
case "${PULSE_MODE:-internal}" in
    internal)
        pulseaudio --system --daemonize=yes --disallow-exit --exit-idle-time=-1 \
            || echo "WARNING: internal pulseaudio failed to start" >&2
        export PULSE_SERVER="${PULSE_SERVER:-unix:/var/run/pulse/native}"
        ;;
    host)
        [ -n "$PULSE_SERVER" ] || echo "WARNING: PULSE_MODE=host but PULSE_SERVER is unset" >&2
        ;;
    none)
        ;;
esac

cd "$DATA"
exec "$@"