#!/usr/bin/env bash
# 2025 Hyperling
# Clean up a music library.

# Steps:
# 0) Ensure an OLD folder exists, it is what will be refactored.
# 1) Convert all non-mp3 files to mp3 and put them in an INTERIM folder.
# 2) Loop over all OLD and INTERIM's mp3 files and move them to NEW based on data.
#    - Name the file as "${ZERO_LED_TRACK_NUMBER}. ${SONG_TITLE}
#    - Name parent folder as "${YEAR} - ${ALBUM}" if both exist, otherwise just one or the other "${YEAR}${ALBUM}".
#    - Name grandparent folder as "${ARTIST} - ${GENRE}" if both exist, otherwise "${ARTIST}${GENRE}".

# TODO List
# - Organize tracks by Artist + Album folders.
# - Name parent folder as "$YEAR - $ALBUM" if both exist, otherwise just one or the other.
# - Name grandparent folder as ARTIST if it exists, otherwise GENRE. 

# If we are in OLD, go up one level.
if [[ "`pwd`"== */OLD ]]; then
  cd ..
fi

if [[ ! -d OLD ]]; then
  echo "ERROR: Could not find a folder named 'OLD', please create it and add your library there."
fi


echo "Convert m4a's to mp3's."
ls *.m4a | while read m4a; do ffmpeg -nostdin -hide_banner -loglevel quiet -i "$m4a" "$m4a".mp3; done