module RansackMemory::Concern

def save_and_load_filters
  # cancel filter if button pressed
  if params[:cancel_filter].present? && params[:cancel_filter] == "true"
    @selected_filter = nil
    session["#{controller_name}_#{action_name}_#{request.xhr?}"] = nil
    session["#{controller_name}_#{action_name}_#{request.xhr?}_page"] = nil
  end
  if user_signed_in?
    # search term saving
    session["#{controller_name}_#{action_name}_#{request.xhr?}"] = params[::RansackMemory::Core.config[:param]] if params[::RansackMemory::Core.config[:param]].present?
    # page number saving
    session["#{controller_name}_#{action_name}_#{request.xhr?}_page"] = params[:page] if params[:page].present?
    # per page saving
    session["#{controller_name}_#{action_name}_#{request.xhr?}_per_page"] = params[:per_page] if params[:per_page].present?
  end
  if user_signed_in?
    # search term load
    if session["#{controller_name}_#{action_name}_#{request.xhr?}"]
      params[::RansackMemory::Core.config[:param]] = session["#{controller_name}_#{action_name}_#{request.xhr?}"]
    else
      params[::RansackMemory::Core.config[:param]] = nil
    end
    # page number load
    if session["#{controller_name}_#{action_name}_#{request.xhr?}_page"]
      params[:page] = session["#{controller_name}_#{action_name}_#{request.xhr?}_page"]
    else
      params[:page] = nil
    end
    # set page number to 1 if filter has changed
    if (params[::RansackMemory::Core.config[:param]] && session[:last_q_params] != params[::RansackMemory::Core.config[:param]]) || (params[:cancel_filter].present? && session["#{controller_name}_#{action_name}_#{request.xhr?}_page"] != params[:page])
      params[:page] = nil
      session["#{controller_name}_#{action_name}_#{request.xhr?}_page"] = nil
    end
    session[:last_q_params] = params[::RansackMemory::Core.config[:param]]
    # per page load
    if session["#{controller_name}_#{action_name}_#{request.xhr?}_per_page"]
      params[:per_page] = session["#{controller_name}_#{action_name}_#{request.xhr?}_per_page"]
    else
      params[:per_page] = nil
    end
  end
end