#!/bin/bash

# If there are multiple usable sound cards, prompt the user to choose one,
# using auditory feedback.
# This script is released under the GNU General Public License.

source /usr/share/livecd-sound/functions

nwords() {
	echo $#
}

is_numeric() {
	local str=$1
	expr match "$str" '[[:digit:]]\+$' > /dev/null 2>&1
}

set_default_card() {
	local card=$1
	sed -e "s/%card%/$card/g" < /usr/share/livecd-sound/asound.conf.in \
	    > /etc/asound.conf
}

play_on_card() {
	local card=$1 file=$2
	aplay "-Dplughw:$card,0" "$file"
}

set -f
usable_cards="$(list_non_pcsp_cards)"
num_usable_cards=$(nwords $usable_cards)

if [ "$num_usable_cards" -eq 1 ]; then
	exit 0
fi

for card in $usable_cards; do
	if ! is_numeric "$card"; then
		continue
	fi
	play_on_card "$card" /usr/share/livecd-sound/sounds/pick-a-card.wav&
done
wait
sleep 1
for card in $usable_cards; do
	if ! is_numeric "$card"; then
		continue
	fi
	play_on_card "$card" /usr/share/livecd-sound/sounds/beep.wav
	if read -t 10; then
		set_default_card "$card"
		break
	fi
done