module NoosferoHttpCaching

  def self.included(c)
    c.send(:after_filter, :noosfero_set_cache)
    c.send(:after_filter, :noosfero_session_check)
  end

  def noosfero_set_cache
    return if logged_in?
    n = nil
    if profile
      unless request.path =~ /^\/myprofile/
        n = environment.profile_cache_in_minutes
      end
    else
      if request.path == '/'
        n = environment.home_cache_in_minutes
      else
        if params[:controller] != 'account' && !request.xhr? && request.path !~ /^\/admin/
          n = environment.general_cache_in_minutes
        end
      end
    end
    if n
      expires_in n.minutes, :private => false, :public => true
    end
  end

  def noosfero_session_check
    return if params[:controller] == 'account' || request.xhr?
    headers["X-Noosfero-Auth"] = (session[:user] != nil).to_s
  end

  class Middleware
    def initialize(app)
      @app = app
    end
    def call(env)
      status, headers, body = @app.call(env)
      if headers['X-Noosfero-Auth'] == 'false'
        headers.delete('Set-Cookie')
      end
      headers.delete('X-Noosfero-Auth')
      [status, headers, body]
    end
  end

end

unless Rails.env.development?
  middleware = ActionController::Dispatcher.middleware
  cookies_mw = ActionController::Session::CookieStore
  ActionController::Base.send(:include, NoosferoHttpCaching)
  middleware.insert_before(cookies_mw, NoosferoHttpCaching::Middleware)
end