#!/usr/bin/env bash

# I frequently discover some of my music is simply awful. So I file them away in
# my 1-star.m3u playlist. This script reads those songs, deletes them, and
# cleans up any empty folders it leaves behind.
#
# Usage: cleanup-music

set -e
shopt -s nullglob

musicdir=$(awk '/music_directory/ { print gensub(/"/, "", "g", $2); }' "$HOME/.config/mpd/mpd.conf")
musicdir="${musicdir/#\~/$HOME}"
playlistdir=$(awk '/playlist_directory/ { print gensub(/"/, "", "g", $2); }' "$HOME/.config/mpd/mpd.conf")
playlistdir="${playlistdir/#\~/$HOME}"

playlistfile="${playlistdir}/1-star.m3u"

# Delete designated songs
IFS=$'\n'
declare -a to_delete=()
while read -r song; do
    songpath="${musicdir}/${song}"
    [[ -f $songpath ]] && to_delete+=("$songpath")
done < "$playlistfile"

if (( ${#to_delete[@]} == 0 )); then
    echo "Nothing to delete"
    exit
fi

printf "Deleting %s songs:\n\n%s\n\nConfirm? (y/n) " \
    "${#to_delete[@]}" \
    "$(IFS=$'\n'; printf "%s" "${to_delete[*]}")"
read -r confirm
case $confirm in
    y|Y)
        echo "Deleting..."
        for file in "${to_delete[@]}"; do
            rm -fv "$file"
        done
        ;;
    n|N) echo "Aborted"; exit ;;
    *) echo "Invalid" ;;
esac
:>"$playlistfile"

# Remove duplicates across all playlists
for playlist in ${playlistdir}/*.m3u; do
    awk '!seen[$0]++' "${playlist}" > "${playlist}.tmp"
    if [[ -f "${playlist}.tmp" ]]; then
        rm -f "$playlist"
        mv "${playlist}.tmp" "$playlist"
    fi
done

# Remove empty directories
find "$HOME/music" -type d -empty -delete