#!/bin/bash

IFS=$'\n'

mkdir unknown
for i in $(ls -1 *.{m,M}{p,P}3)
do
    filename=${i%[.][mM][pP][3]}

    id3v2 -l -C "$i"

    id3_artist=`id3v2 -l "$i" | grep -i TPE1 | cut -d ':' -f 2`
    id3_title=`id3v2 -l "$i" | grep -i TIT2 | cut -d ':' -f 2`
    id3_album=`id3v2 -l "$i" | grep -i TALB | cut -d ':' -f 2`
    id3_track=`id3v2 -l "$i" | grep -i TRCK | cut -d ':' -f 2`
    id3_year=`id3v2 -l "$i" | grep -i TYER | cut -d ':' -f 2`
    id3_lang=`id3v2 -l "$i" | grep -i TLEN | cut -d ':' -f 2`

    id3_artist=${id3_artist:1}
    id3_title=${id3_title:1}
    id3_album=${id3_album:1}
    id3_track=${id3_track:1}
    id3_year=${id3_year:1}
    id3_lang=${id3_lang:1}

    ffmpeg -i "$i" -acodec libvorbis -aq 6 "$filename.ogg"

    vorbiscomment -a -R \
    -t "ARTIST=$id3_artist" \
    -t "TITLE=$id3_title" \
    -t "ALBUM=$id3_album" \
    -t "TRACKNUMBER=$id3_track" \
    -t "DATE=$id3_year" \
    -t "LANGUAGE=$id3_lang" \
    -t "GENRE=" \
    -t "ALBUM_PIC=" \
    -t "YOUTUBE=" \
    "$filename.ogg"

    if [ -z $id3_artist ]; then
        mv "$filename.ogg" "unknown/$filename.ogg"
    else
        if [ -z $id3_album ]; then
            mkdir -p "$id3_artist/unknown"
            mv "$filename.ogg" "$id3_artist/unknown"
        else
            mkdir -p "$id3_artist/$id3_album"
            if [ -z $id3_title ]; then
                mv "$filename.ogg" "$id3_artist/$id3_album/X - $filename.ogg"
            else
                mv "$filename.ogg" "$id3_artist/$id3_album/$id3_track - $id3_title.ogg"
            fi
        fi
    fi
done