require 'rubygems'
require 'mechanize'
require 'uri'
require 'nokogiri'


def get_group_posts(group_id,limit)
    out = []
    client = Mechanize.new

    url_grp = URI::HTTPS.build(host: 'ok.ru',path: "/group#{group_id}")
    body = client.get(url_grp).body
    body =~ /st.markerb="(.+?)"/i
    markerB = $1
    body =~ /gwtHash:"(.+?)"/i
    gwt_requested = $1

    html_requests_page = Nokogiri::HTML.fragment(body)
    puts "1 feed page(#{markerB})"
    out =+ html_requests_page.search(".feed-w")

    start_page = 2

    url = URI::HTTPS.build(host: 'ok.ru',path: '/dk', query: URI.encode_www_form(
      'cmd': 'AltGroupMainFeedsNewRB',
      'st.gid': group_id
    ))
     []

    while markerB && out.count < limit do
        puts "#{start_page} feed page(#{markerB})"
        content = client.post(url,{
            'fetch': false,
            'st.page': start_page,
            'st.markerB': markerB,
            'gwt.requested': gwt_requested
        }).body
        content =~ /st.markerb="(.+?)"/i
        markerB = $1
        ajax_requested_page = Nokogiri::HTML.fragment(content)

        posts = ajax_requested_page.search(".feed-w") #это прост для примера

        out += posts

        start_page += 1

    end

    #вот туть надо сделать чтобы если на странице больше постов чем надо до лимита последнии из out выпиливать
    out
end

get_group_posts('53485850722549',40)