require "id3tag"
require "fileutils"

puts "enter absolute path to music folder:"
indir = gets.chomp
# Example: "/home/shivam/Music/Music/F01"
indir = indir.sub(/\/$/, "") + "/*"

puts "enter extraction path (absolute):"
outdir = gets.chomp
# Example: "/tmp/songs"
outdir = outdir.sub(/\/$/, "") + "/"

files = Dir[indir]
files.reject! { |file| file !~ /.mp3/ }

meta_array = []

files.each { |file|
	hash = {}
	ID3Tag.read(File.open(file, "rb")) do |tag|
		hash[:artist] = tag.artist
		hash[:title] = tag.title
		hash[:album] = tag.album
		hash[:path] = file
	end
	meta_array << hash
}

albums =  meta_array.group_by { |a| a[:album] }

begin
albums.each { |album|
	album_path = outdir + album[0].gsub(/\//,"-")
	FileUtils.mkdir_p album_path
	album.last.each { |hash|
		title = (hash[:title] || "Unknown Track #{rand(1000)}").gsub(/\//,"-")
		FileUtils.cp hash[:path], (album_path + "/" + title).sub(/\.mp3$/,"") + ".mp3"
	}
}
end
rescue => e
	puts e.inspect
	puts @hash.inspect
end