hello-gem/hello

module Hello
  module Business
    module Authentication
      class SignIn < Base
        attr_accessor :login, :password

        def authenticate(login, password)
          @ignited = true
          @login = login
          @password = password

          validates_presence_of :login, :password
          return false if any_errors?

          find_user_by_login
          check_login_found
          return false if any_errors?

          check_password_matches
          return false if any_errors?

          true
        end

        def bad_login?
          !!@bad_login
        end

        def bad_password?
          !!@bad_password
        end

        def user
          @user ||= ::User.new
        end

        private

        # authenticate helpers

        def any_errors?
          errors.full_messages.any?
        end

        def find_user_by_login
          @user = if login_is_email?
                    find_user_by_login_email
                  else
                    find_user_by_login_username
          end
        end

        def find_user_by_login_email
          e = ::EmailCredential.find_by_email(login)
          e && e.user
        end

        def find_user_by_login_username
          ::User.where(username: login).first
        end

        def check_login_found
          add_errors_for_login_not_found if @user.nil?
        end

        def check_password_matches
          add_errors_for_password_incorrect unless user.password_is?(password)
        end

        def add_errors_for_login_not_found
          @bad_login = true
          errors.add(:login, 'was not found')
        end

        def add_errors_for_password_incorrect
          @bad_password = true
          errors.add(:password, 'is incorrect')
        end

        # helpers

        def login_is_email?
          login.to_s.include? '@'
        end

        def ignited
          @ignited || false
        end
      end
    end
  end
end