#!/usr/bin/env ruby

require 'net/http'

begin
  require 'json'
rescue LoadError
  STDERR.puts <<EOF

No JSON parser found. Please run the following command to install:

  sudo gem install json

EOF
  raise
end

module FollowMeStephen
  def run
    auth_user, password = get_user_details
    requestors = fetch_requestors
    requestors.each do |user|
      follow user, auth_user, password
    end
  end
  
  private
  
  def get_user_details
    print 'Please enter your Twitter username: '
    auth_user = gets.chomp
    print 'Please enter your Twitter password: '
    password = gets.chomp
    return auth_user, password
  end
  
  def fetch_requestors
    requestors = []
    puts 'Searching for hashtag "followmestephen"...'
    query = '?q=%23followmestephen&rpp=150'
    while query do
      search = JSON.parse(get("/search.json#{query}"))
      puts "Received page #{search['page']}"
      requestors += search['results'].map {|r| r['from_user']}
      query = search['next_page']
    end
    requestors.uniq
  end
  
  def follow user, auth_user, password
    print "Following #{user}... "
    result = post "/friendships/create/#{user}.json", auth_user, password
    puts result
  end
  
  def get path
    Net::HTTP.get 'search.twitter.com', path
  end
  
  def post path, auth_user, password
    request = Net::HTTP::Post.new path
    request.basic_auth auth_user, password
    response = Net::HTTP.new('twitter.com').start {|http| http.request(request)}
    (response.kind_of? Net::HTTPSuccess) ? 'OK' : 'Failed'
  end
end

include FollowMeStephen
run