#!/bin/sh

printhelp() {
	cat <<EOF
Usage: ${0##*/} [-v VOL] [PATHS...]

Play audio files in PATHS (or .) in random order

	-h	Print this help
	-v VOL	Play with volume VOL (default 100)
EOF
	exit 0
}

printusage() {
	printf 'Usage: %s [-v VOL] [PATHS...]\n' "${0##*/}"
	exit 1
}

volume=100
while getopts hv: opt; do
	case "$opt" in
	h) printhelp ;;
	v)
		if printf %d "$OPTARG" >/dev/null 2>&1; then
			volume="$OPTARG"
		else
			printf "%s: invalid number '%s'\n" "${0##*/}" "$OPTARG"
			exit 1
		fi
		;;
	?) printusage ;;
	esac
done

shift $((OPTIND-1))

if [ $# -lt 1 ]; then
	# set -- "$(. "${XDG_CONFIG_HOME:-"$HOME"/.config}/user-dirs.dirs" && printf '%s' "$XDG_MUSIC_DIR")"
	set -- .
fi

prev1=
prev2=
while true; do
	file="$(find -L "$@" -type f \( -name '*.m4a' -o -name '*.opus' \) ! -path "$prev1" ! -path "$prev2" -exec shuf -n1 -e '{}' +)"
	prev1="$prev2"
	prev2="$file"
	printf 'Playing %s\n' "${file#$dir/}"
	mpv --volume="$volume" "$file"
done