module TrustyCms::Pagination::Controller

def self.included(base)
  base.class_eval {
    helper_method :pagination_parameters
    before_filter :configure_pagination
  }
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
  [: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