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#encoding:utf-8
require "base64"

class TurnUrl

  def initialize(url)
    @url = url.to_s
  end

  def url_encoding
    @url =  Base64.decode64(@url)
  end

  def to_s
    if @url.empty?
      return "地址为空，请重新输入\n"
    end
    if @url =~ /thunder/
      @url = @url[10..-1] + "\n"
      @url = url_encoding()
      @url = @url[2...-2]
    elsif @url =~ /flashget/
      @url = @url[11...@url.index("&")] + "\n"
      @url = url_encoding()
      @url = @url[10...-10]
    elsif @url =~ /qqdl/
      @url = @url[7..-1] + "\n"
      @url = url_encoding()
    else
      @url = "地址非法，请重新输入"
    end
    return @url
  end

  private :url_encoding

end

item = "thunder://QUFodHRwOi8veGlhemFpLnhpYXphaWJhLmNvbS9Tb2Z0L1kvWW91\
ZGFvRGljdF94aWF6YWliYS5leGVaWg=="

url = TurnUrl.new(item)

print "url is: #{url}"