#!/bin/bash

# check for opustags
if [[ ! "$(command -v opustags)" ]]; then
	printf "Opustags is required to run this script, please install\n"
	exit 1
fi

# strip whitespace function
function _strip { awk '{gsub(/^[ \t]+| [ \t]+$/,""); print $0}' ; }

for i in *.opus; do
	printf "Processing: %s... " "$i"
	opustags -i -D "$i"
	opustags -i -s "GENRE=Audiobook" "$i"
	artist=$(printf "%s" "$i" | awk -F\- '{print $1}' | _strip)
	opustags -i -s "ARTIST=$artist" "$i"
	if [[ "$i" == *"#"* ]]; then
		# series
		album=$(printf "%s" "$i" | awk -F"-" '{print $2}' | awk -F"#" '{print $1}' | _strip)
		track=$(printf "%s" "$i" | awk -F"-" '{print $2}' | awk -F"#" '{print $2}' | awk '{gsub ("^0*",""); print}' | _strip)
		title=$(printf "%s" "$i" | awk -F"-" '{gsub(".opus",""); print $3}' | _strip)
		opustags -i -s "ALBUM=$album" "$i"
		opustags -i -s "TRACKNUMBER=$track" "$i"
		opustags -i -s "TITLE=$title" "$i"
	else
		# single
		title=$(printf "%s" "$i" | awk -F"-" '{gsub(".opus",""); print $2}' | _strip)
		opustags -i -s "TITLE=$title" "$i"
	fi
	printf "Done.\n"
done