#!/bin/bash

parser="$(echo $PWD | rev)"
IFS="
"

partist="$(echo $parser | cut -f 2 -d '/' | rev)"
palbum="$(echo $parser | cut -f 1 -d '/' | rev)"
pgenre="$(echo $parser | cut -f 3 -d '/' | rev)"

if [ "$partist" == "" ] || [ "$palbum" == "" ] || [ "$pgenre" == "" ]; then
    echo "This script expects a format of "'$MUSICBASEPATH'"/Genre/Artist/Album/Song.ext"
    exit;
fi
echo Expected metadata:
echo Artist: $partist
echo Album: $palbum
echo Genre: $pgenre
echo

for i in $@; do
    if [ ! -f "$i" ]; then
        echo File doesn\'t exist. $i
        continue;
    fi
    ffartist="$(ffprobe -hide_banner -i $i 2>&1 | grep artist | grep -v 'album_artist' | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' | sed -e 's/*[[:space:]]$//')"
    ffalbum="$(ffprobe -hide_banner -i $i 2>&1 | grep album | grep -v 'album_artist' | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' | sed -e 's/*[[:space:]]$//')"
    ffgenre="$(ffprobe -hide_banner -i $i 2>&1 | grep genre | head -n 1 | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' | sed -e 's/*[[:space:]]$//')"
    echo For \[$i\]...
    unset tags
    echo Found artist \[$ffartist\]
    if [ "$partist" != "$ffartist" ]; then
        export tags=$tags" -metadata artist=\"$partist\""
    fi
    echo Found album \[$ffalbum\]
    if [ "$ffalbum" != "$palbum" ]; then
        export tags=$tags" -metadata album=\"$palbum\""
    fi
    echo Found genre \[$ffgenre\]
    if [ "$ffgenre" != "$pgenre" ]; then
        export tags=$tags" -metadata genre=\"$pgenre\""
    fi
    if [ "$tags" != "" ]; then
        bash -c "ffmpeg -hide_banner -i \"$i\"$tags \"$i.ffmpeg.mp3\""
        mv "$i.ffmpeg.mp3" "$i"
    fi
    echo
done