namespace :g do
  desc "Create migration"
  task :migration, [:name] do |t, args|
    if args[:name].nil?
      raise "Please provide a name for migration (rake 'g:migration[my_file_name]')"
    end

    date_part = Time.now.strftime("%Y%m%d%H%M%S")
    words_part = args[:name].to_s.split(/(?=[A-Z])/).map(&:downcase).join("_")
    filename = "#{date_part}_#{words_part}.rb"

    full_filename = File.join("db", "migrate", filename)

    File.open(full_filename, "w") do |file|
      file.puts("Sequel.migration do")
      file.puts("  change do")
      file.puts("  end")
      file.puts("end")
    end
  end
end