module Terraformer
  module Credentials
    class DatadogMissingCredentals < RuntimeError
      attr_reader :key

      def initialize(key)
        @key = key

        super(message)
      end

      def message
        "'#{key}' not being passed. set it via CLI --#{key} or #{key.upcase} enviroment variable."
      end
    end

    class Datadog
      KEYS = %w(datadog_api_key datadog_app_key).freeze

      def self.get_from_options(options)
        KEYS.inject({}) do |credentials, key|
          datadog_key = key.sub("datadog_", "").to_sym
          credentials[datadog_key] = options[key.to_sym].nil? ? options[key] : options[key.to_sym]
          credentials[datadog_key] = ENV[key.upcase] if credentials[datadog_key].nil?
          raise DatadogMissingCredentals.new(key) if credentials[datadog_key].nil?

          credentials
        end
      end
    end
  end
end