require 'omniauth/oauth'
require 'multi_json'

module OmniAuth
  module Strategies
    # Authenticate to Plurk via OAuth and retrieve basic user info.
    #
    # Please note that this strategy relies on Plurk API 2.0,
    # which is still in Beta.
    #
    # Usage:
    #   use OmniAuth::Strategies::Plurk
    class Plurk < OmniAuth::Strategies::OAuth
      # @param [Rack Application] app standard middleware application parameter
      # @param [String] consumer_key App key [registered on plurk] (http://www.plurk.com/PlurkApp/register)
      # @param [String] consumer_secret App secret registered on plurk
      def initialize(app, consumer_key=nil, consumer_secret=nil, options={}, &block)
        client_options = {
          :access_token_path => '/OAuth/access_token',
          :authorize_path => '/OAuth/authorize',
          :request_token_path => '/OAuth/request_token',
          :site => 'http://www.plurk.com',
        }
        super(app, :plurk, consumer_key, consumer_secret, client_options, options, &block)
      end

      def auth_hash
        user = self.user_hash
        OmniAuth::Utils.deep_merge(super,
          {
            'uid' => user['id'],
            'user_info' => user_info,
            'extra' => {
              'user_hash' => user_hash,
            },
          }
        )
      end

      def user_info
        user = self.user_hash
        {
          'name' => user['full_name'],
          'nickname' => user['display_name'] || user['nick_name'],
          'location' => user['location'],
          'image' => user['has_profile_image'] == 1 ? "http://avatars.plurk.com/#{user['id']}-medium#{user['avatar']}.gif" : 'http://www.plurk.com/static/default_medium.gif',
          'urls' => {'Plurk' => 'http://plurk.com/' + user['nick_name']},
        }
      end

      def user_hash
        @user_hash  ||= MultiJson.decode(@access_token.get('/APP/Profile/getOwnProfile').body)['user_info']
      end

    end
  end
end