#!/usr/bin/env ruby
# RailsConf Scraper
# Written by Erik Gregg
# 8/2006
require 'rubygems'
require 'ncurses'
require 'open-uri'
require 'diff/lcs'
require 'net/smtp'
require 'rmail'
require 'action_mailer'
require 'active_support'
require 'action_view'
include ActionView::Helpers::DateHelper

# Define all the junk
# ---------------------------------------------------------
dudes = ['hardware.hank@gmail.com'] # People who get emails
site_to_watch = 'http://railsconf.org/pages/registration'
start_time = Time.now
emails = 0
# ---------------------------------------------------------

# Set up Ncurses
Ncurses.initscr
Ncurses.mvaddstr(0, 0, "RailsConf Scraper")
Ncurses.mvaddstr(1, 0, "Written by Erik Gregg")
Ncurses.mvaddstr(2, 0, "Running for #{time_ago_in_words(start_time)}.")
Ncurses.mvaddstr(3, 0, "#{emails} Emails sent.")
Ncurses.refresh

trap("INT") do
	Ncurses.endwin
	exit
end
trap("TERM") do
	Ncurses.endwin
	exit
end

p = open(site_to_watch).read
loop do
	q = open(site_to_watch).read
  a = Diff::LCS.diff(p,q)
  if a.size > 1
    puts time = "RailsConfScrape: "+Time.now.to_s
		num = a.size > 1 ? "#{a.size} Changes" : "#{a.size} Change"
		body = time+"\n"+"#{num} Detected! #{site_to_watch}\nSurf now!"
		# Oh Crap MAIL TIME!
		dudes.each do |dude|
			message = RMail::Message.new
			message.body = body
			message.header.from = "RailsConfScraper@modzer0.cs.uaf.edu"
			message.header.to = dude
			message.header.subject = time
			smtp_server_name = "localhost"
			smtp_client = Net::SMTP.new(smtp_server_name)
			smtp_client.start(smtp_server_name) do |smtp|
				smtp.send_message(
					message,
					message.header['From'],
					message.header['To'])
			end
		emails +=1
		end
  end
	p = q
  sleep 300+rand(300)
	Ncurses.clear
	Ncurses.mvaddstr(0, 0, "RailsConf Scraper")
	Ncurses.mvaddstr(1, 0, "Written by Erik Gregg")
	Ncurses.mvaddstr(2, 0, "Running for #{time_ago_in_words(start_time)}.")
	Ncurses.mvaddstr(3, 0, "#{emails} Emails sent.")
	Ncurses.refresh
end