module Mailings
  module PublicUrl
    module_function

    def options
      opts = Rails.application.config.action_mailer.default_url_options.to_h.symbolize_keys
      opts[:protocol] ||= protocol
      port = opts[:port].to_i
      opts.delete(:port) if port.zero? || default_port?(port)
      opts
    end

    def protocol
      return "https" if Rails.application.config.force_ssl
      return "https" if ENV["ASSUME_SSL"] == "true"

      "http"
    end

    def default_port?(port)
      (protocol == "https" && port == 443) || (protocol == "http" && port == 80)
    end
  end
end