class Tynn
  # Adds helper methods to get and check the current environment.
  #
  # ```
  # require "tynn"
  # require "tynn/environment"
  #
  # Tynn.helpers(Tynn::Environment)
  #
  # Tynn.environment  # => :development
  #
  # Tynn.development? # => true
  # Tynn.production?  # => false
  # Tynn.test?        # => false
  # ```
  #
  # By default, the environment is based on `ENV["RACK_ENV"]`.
  #
  # ```
  # Tynn.helpers(Tynn::Environment, env: ENV["RACK_ENV"])
  # ```
  #
  module Environment
    def self.setup(app, env: ENV["RACK_ENV"]) # :nodoc:
      app.set(:environment, (env || :development).to_sym)
    end

    module ClassMethods # :nodoc:
      def environment
        return settings[:environment]
      end

      def development?
        return environment == :development
      end

      def test?
        return environment == :test
      end

      def production?
        return environment == :production
      end
    end
  end
end