#!/bin/bash

# This script helps me download back my own albums from deab.bandcamp.com from my unraid server
#
# It takes the first positional argument : a folder with youtube-dl downloaded audio-only tracks from bandcamp with their associated pictures and json metadata
# And it parses the json to extract track name and number, album name, cover and number of tracks, and uses eyeD3 to updates the ID3 tags, rename and move the files

for d in /mnt/user/downloads/youtube-dl/autoprocessor/*/
    do
        echo "Processing " "$d"
        echo "..."

        files="$d*.mp3"

        for f in $files;
            do
                # collects metadata from json file
                track=$(jq ".track" "${f%.*}.info.json"  | tr -d '"');
                track_number=$(jq ".track_number" "${f%.*}.info.json" | tr -d '"');
                n_entries=$(jq ".n_entries" "${f%.*}.info.json" | tr -d '"');
                artist=$(jq ".artist" "${f%.*}.info.json" | tr -d '"');
                album=$(jq ".album" "${f%.*}.info.json" | tr -d '"');
                year=$(jq ".release_year" "${f%.*}.info.json" | tr -d '"');
                cover="${f%.*}.jpg";

                # updates the ID3 tags on the mp3 file
                eyeD3 --title "$track" \
                    --track "$track_number" \
                    --track-total "$n_entries" \
                    --artist "$artist" \
                    --album "$album" \
                    --release-year "$year" \
                    --add-image "$cover":FRONT_COVER: \
                    "$f";

                # moves the files into an path/to/music/folder/artist/album/
                new_name=$(printf '%02d - %s.mp3' "$track_number" "$track");
                mkdir -p "/mnt/user/music/nettoyage/youtubedl/$artist";
                mkdir -p "/mnt/user/music/nettoyage/youtubedl/$artist/$year - $album";
                mv "$f" "/mnt/user/music/nettoyage/youtubedl/$artist/$year - $album/$new_name";
            done

        # removes the original folder
        rm -R "$d"

        echo "Done with" "$d"
        echo "---"
    done