module TrustyCms::Pagination::Controller

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

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