module Danthes
  module ViewHelpers
    # Publish the given data or block to the client by sending
    # a Net::HTTP POST request to the Faye server. If a block
    # or string is passed in, it is evaluated as JavaScript
    # on the client. Otherwise it will be converted to JSON
    # for use in a JavaScript callback.
    def publish_to(channel, data = nil, &block)
      Danthes.publish_to(channel, data || capture(&block))
    end

    # Subscribe the client to the given channel. This generates
    # some JavaScript calling Danthes.sign with the subscription
    # options.
    def subscribe_to(channel, opts = {})
      js_tag = opts.delete(:include_js_tag){ true }
      subscription = Danthes.subscription(channel: channel)
      content = raw("if (typeof Danthes != 'undefined') { Danthes.sign(#{subscription.to_json}) }")
      js_tag ? content_tag('script', content, type: 'text/javascript') : content
    end
  end
end