require 'net/http'
require 'json'

# need to accumulate twitter usernames to avoid hitting twitter api
# rate limit. the users/lookup method will lookup up to 100 users at
# a time.
@twitter_username_sxsocial_id_map = {}

def get_user_id
  @username = @link.url.split('/').last
  @network  = @link.url.match(/([\w]+).com/)[1]
  case @network
  when 'facebook' then get_facebook_id if @link.user.facebook_id.blank?
  when 'twitter'  then push_twitter_username if @link.user.twitter_id.blank?
  when 'linkedin' then get_linkedin_id if @link.user.linkedin_id.blank?
  else
    @id = nil
  end
  if @id
    @link.user.save
  end
end

def get_facebook_id
  response = Net::HTTP.get_response('graph.facebook.com', "/#{@username}")
  if response.code == '200'
    puts response.body
    unless response.body.match(/^false/) # some kind of error
      json = JSON.parse(response.body)
      @id = json['id']
      @link.user.facebook_id = @id
    end
  else
    @id = nil
  end
end

def push_twitter_username
  @twitter_username_sxsocial_id_map[@username.downcase] = @link.user.id
  # can only do 100 at a time due to twitter api limitation
  if @twitter_username_sxsocial_id_map.size == 99
    pop_twitter_usernames
    @twitter_username_sxsocial_id_map = {}
  end
  @id = nil # so we don't try to save this user yet
end

def pop_twitter_usernames
  puts "POPPING TWITTER USERNAMES"
  username_list = []
  @twitter_username_sxsocial_id_map.each_key do |username|
    username_list << username
  end
  twitter_users = Twitter.users(username_list.join(', '))
  twitter_users.each do |twitter_user|
    our_user_id = @twitter_username_sxsocial_id_map[twitter_user['screen_name'].downcase]
    unless our_user_id.blank?
      our_user = User.find(our_user_id)
      our_user.update_attribute :twitter_id, twitter_user['id']
    end
  end
end

### not implemented yet
def get_linkedin_id
  @id = nil
end

#links = Link.find(:all, :conditions => 'user_id = 444')

links = Link.find(:all,
  :conditions => "url ilike '%facebook.com%' or url ilike '%twitter.com%'"#,
  #:limit => 10
)

links.each do |link|
  @link = link
  get_user_id
end

# pop the remaining twitter usernames
pop_twitter_usernames