module RansackMemory::Concern

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