#!/bin/ash

PROC="/proc/asound/pcm"

i=0
while [ "$(( ++i ))" -lt 10 ]; do
	[ -r "$PROC" ] && break
	sleep 1
done
if ! [ -r "$PROC" ]; then
	echo "'${PROC}' not found or not readable. Not setting default sound card."
	exit 0
fi

if [ -w "/etc" ]; then
	FILE="/etc/asound.conf"
elif [ -n "$HOME" ]; then
	FILE="${HOME}/.asoundrc"
else
	FILE="$(getent passwd "$(id -u)" | awk -F ':' '{print $6}')/.asoundrc"
fi

if [ -e "${FILE}" -a "x$1" != "x--force" ]; then
	echo "'${FILE}' already exists, use --force to overwrite."
	exit 1
fi

. /opt/openslx/config

GREPOPT="-v -m 1"
if [ "x$SLX_PREFERRED_SOUND_OUTPUT" = "xHDMI" ]; then
	# Prefer HDMI, so let's check whether there is actually
	# something connected via HDMI. This might still be screen
	# that doesn't support sound output, but it's better than nothing
	found=false
	cnt=1
	for i in /sys/class/drm/card*-HDMI*; do
		if [ "x$(cat "$i/status")" = "xconnected" ]; then
			found=true
			break
		fi
		cnt=$(( cnt + 1 ))
	done
	if $found; then
		GREPOPT="-m $cnt"
	fi
fi
# Try to filter/prefer HDMI cards
tmpf=$( mktemp )
[ -z "$tmpf" ] && tmpf=/tmp/borkenbämpfong
sort -u "${PROC}" | grep $GREPOPT -i HDMI | tail -n 1 | cut -c1-5 | tr -- '-' ' ' > "$tmpf"
< "$tmpf"  read card device _
rm -f -- "$tmpf"

# If empty, do nothing so defaults get used
if [ -z "${card}" ]; then
	echo "No suitable sound card found, defaults apply."
	exit 0
fi

# Remove leading zero if any (both values are two digit)
card=${card#0}
device=${device#0}

cat > "${FILE}" <<HEREDOC
defaults.pcm.!card $card
defaults.ctl.!card $card

defaults.pcm.!device $device
defaults.ctl.!device $device

HEREDOC