class Renren

  def initialize(e,p)
    @agent = Mechanize.new
    @page = @agent.get('http://3g.renren.com/')
    @page = @page.form_with(:method => 'POST') do |r|
      r.email = e
      r.password = p
    end.submit
  end

  def fetch_other_photo(album_link,foldername)
    photo_urls = []
    puts Iconv.conv("gb2312", "utf-8", "開始分析相冊地址.....")
    begin
      user_id,album_id = parse_album_uri(album_link)
    rescue
      puts Iconv.conv("gb2312", "utf-8", "您的相冊地址不正確，請重新輸入！")
      return
    end
    page = @agent.get("http://3g.renren.com/album/wgetalbum.do?id=#{user_id}&owner=#{album_id}")
    puts Iconv.conv("gb2312", "utf-8", "正在獲取所有照片地址.....")
    loop do
      page.links_with(:href => /http:////3g/.renren/.com//album//wgetphoto/.do?/).each do |link|
        photo = link.click
        photo_urls << photo.link_with(:text => "下載該圖").href
      end
      break if page.link_with(:text => "下一頁").nil?
      page = page.link_with(:text => "下一頁").click
    end
    if photo_urls.length > 0
      puts Iconv.conv("gb2312", "utf-8", "開始下載相冊.....")
      unless File.directory?("#{foldername}")
        Dir.mkdir("#{foldername}")
      end
      Dir.chdir("#{foldername}") do |path|
          photo_urls.each do |photo_url|
            @agent.get(photo_url) do |photo|
              puts Iconv.conv("gb2312","utf-8","正在保存文件#{photo.filename}……已經下載#{((photo_urls.index(photo_url)+1).to_f/photo_urls.length*100).to_i}%")
              photo.save
            end
          end
      end
      puts Iconv.conv("gb2312","utf-8","相冊下載完畢.....")
    else
      puts Iconv.conv("gb2312","utf-8","相冊內沒有照片喲~")
    end
  end

  private

  def parse_album_uri(uri)
    uri = uri.chomp("#thumb")
    uri = uri.split("?")
    if uri.length > 1 and uri[1].include?("owner")
      uri = uri[1].split("&")
      user_id = uri[0].split("=")[1]
      album_id = uri[1].split("=")[1]
    else
      uri = uri[0].split("/")
      album_id = uri[4]
      user_id = uri[5].split("-")[1]
    end
    return user_id,album_id
  end
end

print Iconv.conv("gb2312","utf-8","用戶名：")
username = gets.chomp()
print Iconv.conv("gb2312","utf-8","密碼：")
password = gets.chomp()
renren = Renren.new(username,password)
loop do
  print Iconv.conv("gb2312","utf-8","粘貼相冊地址：")
  uri = gets.chomp()
  renren.fetch_other_photo(uri, username)
  print Iconv.conv("gb2312","utf-8","按0退出程序，按其它鍵繼續下載其它相冊：")
  break if gets.chomp() == "0"
end