# frozen_string_literal: true

require "em_promise"

module EM
	def self.promise_defer(klass: EMPromise, &block)
		promise = klass.new
		EventMachine.defer(
			block,
			promise.method(:fulfill),
			promise.method(:reject)
		)
		promise
	end

	def self.promise_fiber
		promise = EMPromise.new
		Fiber.new {
			begin
				promise.fulfill(yield)
			rescue StandardError => e
				promise.reject(e)
			end
		}.resume
		promise
	end

	def self.promise_timer(timeout)
		promise = EMPromise.new
		EM.add_timer(timeout) do
			promise.fulfill(nil)
		end
		promise
	end
end