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 parse_facebook_signed_request['expires'] > Time.now.to_i # Se o access_token do usuário não estiver expirado
          if !session[:not_verify_facebook_permissions] == true
            begin
              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
            rescue Koala::Facebook::AuthenticationError
              redirect = true

              # Remove o signed_request da URL já que ele está expirado e recarrega o objeto do @oauth
              if params[:callback_url].present?
                params[:callback_url].gsub!("signed_request=#{params[:signed_request]}", "")
              elsif request.present?
                request.fullpath.gsub!("signed_request=#{params[:signed_request]}", "")
              else
                PlataformaSocial.facebook_callback_url.to_s.gsub!("signed_request=#{params[:signed_request]}", "")
              end

              load_oauth
            end
          end
        else
          redirect = true
        end
      end

      if redirect
        render :text => %|<script type="text/javascript">window.top.location.href="#{@oauth.url_for_oauth_code(:permissions => PlataformaSocial.configuration.facebook_scope)}";</script>|
      end
    end

    def load_user_data options = {}
      settings = {
        referral_code: params[:gm_referral_code],
        source: params[:utm_source],
        utm: {
          source: params[:utm_source],
          medium: params[:utm_medium],
          campaign: params[:utm_campaign]
        },
        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],
        utm: {
          source: params[:utm_source],
          medium: params[:utm_medium],
          campaign: params[:utm_campaign]
        },
        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
      if params[:callback_url].present?
        callback_url = params[:callback_url]
      elsif request.present?
        callback_url = "#{request.protocol}#{request.host_with_port}#{request.fullpath}"
      else
        callback_url = PlataformaSocial.facebook_callback_url.to_s
      end

      uri = URI.parse(callback_url)

      callback_url = if uri && uri.scheme.present?
        uri.query = [
          uri.query,
          "gm_referral_code=#{URI.encode(params[:gm_referral_code] || '')}",
          "utm_source=#{URI.encode(params[:utm_source] || '')}",
          "source=#{URI.encode(params[:utm_source] || '')}",
          "campaign=#{URI.encode(params[:utm_campaign] || '')}",
          "utm_campaign=#{URI.encode(params[:utm_campaign] || '')}",
          "medium=#{URI.encode(params[:utm_medium] || '')}",
          "utm_medium=#{URI.encode(params[:utm_medium] || '')}"
        ].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