require 'rubygems'
require 'nokogiri'
require 'rest-client'
require 'mail'
require 'uri'

options = { address:               "smtp.gmail.com",
            port:                   587,
            domain:                'localhost',
            user_name:             'pavel.shebalkou@gmail.com',
            password:              '*********',
            authentication:        'plain',
            enable_starttls_auto:   true }

Mail.defaults do
  delivery_method :smtp, options
end

def execution_loop(period)
  loop do
    before = Time.now
    yield
    interval = period - (Time.now - before)
    sleep(interval) if interval > 0
  end
end

def get_url
  url = RestClient.get('https://vk.com/psychohell')
end

def read_html(link)
  page = Nokogiri::HTML(link)
end

def get_status(page)
  status = page.css('.profile_time_lv').text
end

def send_email(status)
  if status.include?("заходил") || status.include?("сети")
    puts "Вадим #{status}"

  else
    Mail.deliver do
      to 'elizeoban@gmail.com'
      from 'pavel.shebalkou@gmail.com'
      subject 'vk_online_checker_notification'
      body 'Nell is now online'
    end
    puts 'Вадим сейчас Online'
  end
end

begin
  execution_loop(60) do
    url = get_url
    html_page = read_html(url)
    status = get_status(html_page)
    send_email(status)
  end

rescue
  LoadError

ensure
  puts "Попробуйте еще раз"
end