module TrustyCms
  module Pagination
    module Controller
      # for inclusion into public-facing controllers

      def configure_pagination
        # unconfigured parameters remain at will_paginate defaults
        # will_paginate controller options are not overridden by tag attribetus
        WillPaginate::ViewHelpers.pagination_options[:param_name] = TrustyCms::Config['pagination.param_name'].to_sym unless TrustyCms::Config['pagination.param_name'].blank?
        WillPaginate::ViewHelpers.pagination_options[:per_page_param_name] = TrustyCms::Config['pagination.per_page_param_name'].blank? ? :per_page : TrustyCms::Config['pagination.per_page_param_name'].to_sym

        # will_paginate view options can be overridden by tag attributes
        %i[class previous_label next_label inner_window outer_window separator container].each do |opt|
          WillPaginate::ViewHelpers.pagination_options[opt] = TrustyCms::Config["pagination.#{opt}"] unless TrustyCms::Config["pagination.#{opt}"].blank?
        end
      end

      def pagination_parameters
        {
          page: params[WillPaginate::ViewHelpers.pagination_options[:param_name]] || 1,
          per_page: params[WillPaginate::ViewHelpers.pagination_options[:per_page_param_name]] || TrustyCms::Config['pagination.per_page'] || 20,
        }
      end

      def self.included(base)
        base.class_eval do
          helper_method :pagination_parameters
          before_action :configure_pagination
        end
      end
    end
  end
end