module ApplicationHelper

def action_cable_meta_tag_dynamic
  scheme = (request.env['HTTP_X_FORWARDED_PROTO'] || request.env["rack.url_scheme"] || '').split(',').last
  return '' if scheme.blank?
  host = request.env['HTTP_X_FORWARDED_HOST'] || request.env["HTTP_HOST"]
  scope = ENV.fetch('FLY_ATC_SCOPE', "")
  root = request.env['RAILS_RELATIVE_URL_ROOT']
  if scope != ""
    websocket = "#{scheme.sub('http', 'ws')}://#{host}#{root}#{scope}/cable"
  else
    websocket = "#{scheme.sub('http', 'ws')}://#{host}#{root}/cable"
  end
  "<meta name=\"action-cable-url\" content=\"#{websocket}\" />".html_safe
end