change duplicate file names

file-change.rb

file_extension = '.rb'
files = Dir["./*#{file_extension}"]

puts "="*10
puts " Total files: #{files.count}"
puts "="*10
files_deleted = 0
file_timestamp = Time.now.strftime('%Y%m%d')
files.each do |file|
  puts File.basename file, file_extension
  fielname = File.basename file, file_extension
  file_words = filename.split('_')
  file_words[-2] = file_timestamp # second last
  new_filename = file_words.join('_') + file_extension

  # if file exists then check for its size
  # if current file's size is greater than replace, otherwise move on
  if File.exist?(new_filename)
    if File.size(filename) < File.size(new_filename)
      puts "deleting file #{new_filename} as its size: #{File.size(new_filename)} than new file found: #{filename} size: #{File.size(filename)}"
      files_deleted += 1
      # File.delete(new_filename)
    end
  end
  puts "renaming file from #{filename} to #{new_filename}"
  # File.rename(filename, new_filename)
  # puts file_timestamp

  # puts File.size(file)
end

puts "#{files_deleted} File deleted"