require 'caracal/core/models/base_model'


module Caracal
  module Core
    module Models

      # This class handles block options passed to the page_numbers
      # method.
      #
      class PageNumberModel < BaseModel

        #-------------------------------------------------------------
        # Configuration
        #-------------------------------------------------------------

        # constants
        const_set(:DEFAULT_PAGE_NUMBER_ALIGN, :center)
        const_set(:DEFAULT_PAGE_NUMBER_SHOW,  false)

        # accessors
        attr_reader :page_number_align
        attr_reader :page_number_label
        attr_reader :page_number_show

        # initialization
        def initialize(options={}, &block)
          @page_number_align = DEFAULT_PAGE_NUMBER_ALIGN
          @page_number_label = nil
          @page_number_show  = DEFAULT_PAGE_NUMBER_SHOW

          super options, &block
        end


        #-------------------------------------------------------------
        # Public Methods
        #-------------------------------------------------------------

        #=============== SETTERS ==============================

        def align(value)
          @page_number_align = value.to_s.to_sym
        end

        def label(value)
          @page_number_label = value.to_s.strip   # renderer will enforce trailing space
        end

        def show(value)
          @page_number_show = !!value
        end


        #=============== VALIDATION ===========================

        def valid?
          (!page_number_show || [:left, :center, :right].include?(page_number_align))
        end


        #-------------------------------------------------------------
        # Private Instance Methods
        #-------------------------------------------------------------
        private

        def option_keys
          [:align, :label, :show]
        end

      end

    end
  end
end