#!/usr/bin/env bash
# from http://www.linuxtutorialblog.com/post/solution-converting-flac-to-mp3

OUT_DIR=${OUT_DIR:="$HOME/tmp/mp3"}
[ ! -d ${OUT_DIR} ] && mkdir -p ${OUT_DIR}

# modify the lame options to your
# preference
lame_opts=" --vbr-new -V 2 -B 256 "

for x in "${@}"
do
	FLAC=${x}
	MP3=`basename "${FLAC%.flac}.mp3"`

	[ -r "$FLAC" ] || { echo can not read file \"$FLAC\" >&1 ; exit 1 ; } ;

	TITLE=""
	TRACKNUMBER=""
	GENRE=""
	DATE=""
	COMMENT=""
	ARTIST=""
	ALBUM=""
	Title=""
	Tracknumber=""
	Genre=""
	Date=""
	Comment=""
	Artist=""
	Album=""

	metaflac --export-tags-to=- "$FLAC" | sed 's/=\(.*\)/="\1"/' > $OUT_DIR/tmp.tmp

	. $OUT_DIR/tmp.tmp
	rm $OUT_DIR/tmp.tmp

	[ -z "$TITLE" ] && TITLE="$Title"
	[ -z "$TRACKNUMBER" ] && TRACKNUMBER="$Tracknumber"
	[ -z "$GENRE" ] && GENRE="$Genre"
	[ -z "$DATE" ] && DATE="$Date"
	[ -z "$COMMENT" ] && COMMENT="$Comment"
	[ -z "$ARTIST" ] && ARTIST="$Artist"
	[ -z "$ALBUM" ] && ALBUM="$Album"

	echo "Converting ${FLAC} to MP3 format"

	OUTFILE="${OUT_DIR}/$ARTIST/${DATE}_$ALBUM/$MP3"
	mkdir -p "${OUT_DIR}/$ARTIST/${DATE}_$ALBUM"
	flac -c -d "$FLAC" | lame ${lame_opts} - "$OUTFILE"

	id3v2 \
		-a "$ARTIST" \
		-A "$ALBUM" \
		-t "$TITLE" \
		-c "$COMMENT" \
		-g "$GENRE" \
		-y "$DATE" \
		-T "$TRACKNUMBER" \
		"$OUTFILE"

done