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require 'rubygems'
require 'digest/md5'
require 'rest_client'
require 'json'
require 'pp'

module Facebook
  Config ={
    :key => 'xxx',
    :secret => 'xx',
    :restserver => 'http://api.facebook.com/restserver.php'
  }

  module API
    Defaults = {
      'v' => '1.0',
      'format' => 'json',
      'api_key' => Config[:key]
    }

    class Session

      attr_reader :auth_token, :auth_session

      def initialize(opts = {})
        @auth_token, @auth_session = nil, nil
      end

      def request_auth_token
        return @auth_token unless @auth_token.nil?
        token = request( 'method' => 'Auth.createToken')
        @auth_token = token.to_a.first.strip.tr('"', '')
        @auth_token
      end

      def request_auth_session
        return @auth_session unless @auth_session.nil?
        request_auth_token
        session = request({'method' => 'Auth.getSession', 'auth_token' => @auth_token})
        @auth_session = session
      end

      def query(q)
        request('method' => 'Fql.query', 'query' => q, 'call_id' => Time.now.to_i)
      end

      private

      def request(args, url="http://api.facebook.com/restserver.php")
        args = API::Defaults.merge(args)
        @response = ""
        RestClient.post(url, args.merge('sig' => signature_for(args))) do |response|
          @response = JSON.parse(response.body) rescue response.body.strip
          yield @response rescue LocalJumpError
        end
        return @response
      end

      def signature_for(params)
        request_str = params.keys.sort.map{|k| "#{k.to_s}=#{params[k.to_s]}" }.join
        Digest::MD5.hexdigest(request_str + Config[:secret])
      end

    end
  end

end

fbs = Facebook::API::Session.new
pp fbs.query("SELECT name FROM user WHERE username='lkundrak'")