module StatisticsHelper
  include AttachmentsHelper

  def data_format_string num
    result = num
    if num < 1
      result = format("%0.1f", (num*1024)).to_s + " KB"
    elsif num < 1024
      result = format("%0.1f", num).to_s + " MB"
    elsif num < 1024 * 1024
      result = format("%0.1f", (num/1024)).to_s + " GB"
    else
      result = format("%0.1f", (num/(1024*1024))).to_s + " TB"
    end
    source = result.split(".")
    source[0] = source[0].gsub(/(\d)(?=(\d{3})+(?!\d))/, "\\1,")
    return source.join(".")
  end

  # excel中的数据大小转换成MB
  def file_size_revert size_str
    result = 0
    unit = size_str[-2, 2]
    if unit == "GB"
      result = size_str.to_f * 1024
    elsif unit == "KB"
      result = (size_str.to_f / 1024).round(3)
    else
      result = size_str.to_f
    end
    result
  end
end