require 'omniauth-oauth2'

module OmniAuth
  module Strategies
    class Yammer < OmniAuth::Strategies::OAuth2
      
      option :name, 'yammer'
      
      option :client_options, {
        :site => 'https://www.yammer.com',
        :authorize_url => '/dialog/oauth',
        :token_url => '/oauth2/access_token.json'
      }
      
      uid { raw_info['id'] }
      
      info do
        prune!({
          :nickname => raw_info['name'],
          :full_name => raw_info['full_name'],
          :location => raw_info['location'],
          :image => raw_info['mugshot_url'],
          :description => raw_info['job_title'],
          :email => raw_info['contact']['email_addresses'][0]['address'],
          :urls => {
            :yammer => raw_info['web_url']
          }
        })
      end

      extra do
        prune!({:raw_info => raw_info})
      end
      
      def request_phase
        options[:authorize_params] = {:scope => options[:scope]} if options[:scope]
        super
      end
        
      def build_access_token
        access_token = super
        token = eval(access_token.token)['token']
        @access_token = ::OAuth2::AccessToken.new(client, token, access_token.params)
      end
 
      def raw_info
        @raw_info ||= access_token.get('/api/v1/users/current.json').parsed
      end
      
      private

      def prune!(hash)
        hash.delete_if do |_, value|
          prune!(value) if value.is_a?(Hash)
          value.nil? || (value.respond_to?(:empty?) && value.empty?)
        end
      end
      
    end
  end
end