#!/usr/bin/env ruby

# Install: kid3-common

require "fileutils"

$stdout.sync = true
files = Dir.glob("*.mp3").sort

if files.empty?
  $stderr.puts "No .mp3 files found"
  exit 1
end

unless File.exist?("albumart.jpg")
  $stderr.puts "albumart.jpg not found"
  exit 1
end

$stdout.write("Artist: ")
artist = gets.chomp

$stdout.write("Album: ")
album = gets.chomp

$stdout.write("Year: ")
year = gets.chomp

files.each do |file|
  if file =~ /^(\d+)\s*(.*)\.mp3$/
    track_number, title = $1.to_i, $2
    command = %w[kid3-cli]
    command += ["-c", %[set artist "#{artist}" 12]]
    command += ["-c", %[set title "#{title}" 12]]
    command += ["-c", %[set album "#{album}" 12]]
    command += ["-c", %[set date "#{year}" 12]]
    command += ["-c", %[set track "#{track_number}" 12]]
    command += ["-c", %[set picture:albumart.jpg 'Front Cover' 2]]
    command += ["-c", "save"]
    command << file
    system(*command)
  else
    $stderr.puts "Warning: skipping #{file}, unrecognized name format"
  end
end