module Api
  module OpenidConnect
    class OAuthApplication < ActiveRecord::Base
      has_many :authorizations
      has_many :user, through: :authorizations

      validates :client_id, presence: true, uniqueness: true
      validates :client_secret, presence: true
      validates :client_name, presence: true

      serialize :redirect_uris, JSON
      serialize :response_types, JSON
      serialize :grant_types, JSON
      serialize :contacts, JSON

      before_validation :setup, on: :create

      def setup
        self.client_id = SecureRandom.hex(16)
        self.client_secret = SecureRandom.hex(32)
        self.response_types = []
        self.grant_types = []
        self.application_type = "web"
        self.contacts = []
        self.logo_uri = ""
        self.client_uri = ""
        self.policy_uri = ""
        self.tos_uri = ""
      end

      class << self
        def available_response_types
          ["id_token", "id_token token", "code"]
        end

        def register!(registrar)
          registrar.validate!
          build_client_application(registrar)
        end

        private

        def build_client_application(registrar)
          create! registrar_attributes(registrar)
        end

        def supported_metadata
          %i(client_name response_types grant_types application_type
             contacts logo_uri client_uri policy_uri tos_uri redirect_uris)
        end

        def registrar_attributes(registrar)
          supported_metadata.each_with_object({}) do |key, attr|
            attr[key] = registrar.public_send(key) if registrar.public_send(key)
          end
        end
      end
    end
  end
end