module Omniauth
  class Social::Service
    attr_reader :provider_data, :controller
    
    def initialize(auth, controller)
      @provider_data = auth.env['omniauth.auth']
      @controller    = controller
    end
    
    def execute
      if signin_via_social
        yield(PostService::Success, PostService::Failure)
      else
        yield(PostService::Failure, PostService::Success)
      end
    end
  
    private
  
    def signin_via_social
      false unless @provider_data
  
      account = AuthProvider.find_by(provider_params)&.user || User.find_by(email: provider_data.info.email)
  
      if account
        account.auth_providers.find_or_create_by(provider_params)
      else
        account = User.create!(user_params)
        account.auth_providers.create(provider_params)
      end
  
      controller.sign_in(account)
      controller.session[:user] = account.email
      true
    end
  
    def provider_params
      { uid: provider_data.uid, provider: provider_data.provider }
    end
  
    def user_params
      { username: provider_data.info.name, email: provider_data.info.email, avatar: avatar(provider_data.info.image) }
    end
  
    def avatar(url)
      file = Tempfile.new
      file.binmode
      file.write open(url).read
      file.rewind
      file
    end
  
    class Success
      def self.call
        yield
      end
    end
  
    class Failure
      def self.call; end
    end
  end  
end