# frozen_string_literal: true

require 'auth/token_service'

# Manages tokens for this App
module Auth
  class AuthTokenService
    include Singleton

    def refresh
      @tokens = mutex.synchronize { obtain_tokens }
    end

    def access_token
      ensure_tokens
      @tokens[:access_token]
    end

  private
    def ensure_tokens
      @tokens ||= mutex.synchronize { obtain_tokens }
    end

    def obtain_tokens
      token_source.fetch('client_credentials', client_id, client_secret)
    end

    def mutex
      @mutex ||= Mutex.new
    end

    def token_source
      @token_source ||= Auth::TokenService.new(auth_url)
    end

    def client_id
      AppConfig.auth.client_id
    end

    def client_secret
      AppConfig.auth.client_secret
    end

    def auth_url
      URI(AppConfig.auth.url)
    end
  end
end