require 'koala'
require 'uri'

module PlataformaSocial
  module Facebook
    def facebook_login
      load_oauth
      load_graph
      
      redirect = false
      
      if params[:code]
        begin
          @oauth.get_access_token(params[:code])
        rescue Koala::Facebook::OAuthTokenRequestError
          redirect = true if parse_facebook_signed_request && !parse_facebook_signed_request['oauth_token']
        end
      else
        redirect = true if parse_facebook_signed_request && !parse_facebook_signed_request['oauth_token']
      end
      
      if parse_facebook_signed_request && parse_facebook_signed_request['oauth_token']
        if !session[:not_verify_facebook_permissions] === true
          permissions = @graph.get_object('me', :fields => 'permissions')['permissions']['data'][0]
          session[:not_verify_facebook_permissions] = true
        
          PlataformaSocial.facebook_scope.split(',').each do |permission|
            redirect = true unless permissions[permission.strip]
          end
        end
      end
      
      render :text => %|<script type="text/javascript">window.top.location.href="#{@oauth.url_for_oauth_code(:permissions => PlataformaSocial.configuration.facebook_scope)}";</script>| if redirect
    end
    
    def load_user_data options = {}
      settings = {
        referral_code: params[:gm_referral_code],
        source: params[:utm_source],
        referrer: request.referer,
        signed_request: params[:signed_request]
      }.merge options
      
      facebook_data          = facebook_user_data.try(:symbolize_keys)
      plataforma_social_data = plataforma_social_user_data(settings).try(:symbolize_keys)
      
      @user_data = { :facebook => facebook_data, :plataforma_social => plataforma_social_data }
    end
    
    def plataforma_social_user_data options = {}
      settings = {
        referral_code: params[:gm_referral_code],
        source: params[:utm_source],
        referrer: request.referer,
        signed_request: params[:signed_request]
      }.merge options
      
      if settings[:signed_request]
        response = Request.post("#{PlataformaSocial.domains('login')}/register", settings)
        
        data = {}
        data[:reference] = response['id'] if response.present? && response['id']
        
        data
      end
    end
    
    def facebook_user_data
      if load_graph
        @graph.get_object('me')
      end
    end
    
    def parse_facebook_signed_request
      load_oauth
      @oauth.parse_signed_request params[:signed_request] if params[:signed_request].present?
    end
    
    def load_oauth
      uri = URI.parse(PlataformaSocial.facebook_callback_url.to_s)
      
      callback_url = if uri && uri.scheme.present?
        uri.query = [uri.query, "gm_referral_code=#{params[:gm_referral_code]}", "utm_source=#{params[:utm_source]}"].compact.join('&')
        uri.to_s
      else
        nil
      end
      
      @oauth = Koala::Facebook::OAuth.new(PlataformaSocial.facebook_app_id, PlataformaSocial.facebook_app_secret, callback_url)
    end
    
    def load_graph
      @graph = Koala::Facebook::API.new parse_facebook_signed_request['oauth_token'] if parse_facebook_signed_request.present? && parse_facebook_signed_request['oauth_token']
    end
  end
end

class ActionController::Base
  include PlataformaSocial::Facebook
end