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#!/usr/bin/env ruby
require 'rubygems'
require 'mechanize'
require 'fastercsv'
require 'progressbar'

cookie, gid = ARGV
url = URI.parse("http://vkontakte.ru/wall-#{gid}")

agent = Mechanize.new
agent.user_agent_alias = 'Mac Safari'
Mechanize::Cookie.parse(url, "remixsid=" + cookie) { |c| agent.cookie_jar.add(url, c) }
pages = agent.get(url.to_s).search('#fw_summary_wrap .pg_lnk:last').attr('href').value.split('=').last.to_i/20

FasterCSV.open('export_vk_wall.csv','w') do |csv|
  csv << ['name', 'message', 'time']
  (0...pages).to_a.each_with_progressbar('Progress') do |p|
    url.query = "offset=#{p * 20}"
    page = agent.get(url.to_s).search("#page_wall_posts")
    page.search('.post .info').each do |post|
      csv << [
        post.search('a.author').text,
        post.search('.wall_text div div').text,
        post.search('.rel_date').text
      ]
    end
    sleep(5 + rand(11))
  end
end