#!/usr/bin/bash

# This script helped me download back my own albums from deab.bandcamp.com
#
# 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

files="$1*.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 to a correct name into an artist/album/ folder
        new_name=$(printf '%02d - %s.mp3' "$track_number" "$track")
        mkdir -p "$artist"
        mkdir -p "$artist/$album"
        mv "$f" "$artist/$album/$new_name"
    done

# removes the original folder asking confirmation
rm -R "$1"