# coding: utf-8

module Thinreports
  module Generator

    module PDF::Page
      # Add JIS-B4,B5 page geometry
      ::PDF::Core::PageGeometry::SIZES.update(
        'B4_JIS' => [728.5, 1031.8],
        'B5_JIS' => [515.9, 728.5]
      )

      # @param [Thinreports::Layout::Format] format
      def start_new_page(format)
        format_id =
          if change_page_format?(format)
            pdf.start_new_page(new_basic_page_options(format))
            @current_page_format = format

            unless format_stamp_registry.include?(format.identifier)
              create_format_stamp(format)
            end
            format.identifier
          else
            pdf.start_new_page(new_basic_page_options(current_page_format))
            current_page_format.identifier
          end

        stamp(format_id.to_s)
      end

      def add_blank_page
        pdf.start_new_page(pdf.page_count.zero? ? {size: 'A4'} : {})
      end

    private

      # @return [Thinreports::Layout::Format]
      attr_reader :current_page_format

      # @param [Thinreports::Layout::Format] new_format
      # @return [Boolean]
      def change_page_format?(new_format)
        !current_page_format ||
          current_page_format.identifier != new_format.identifier
      end

      # @param [Thinreports::Layout::Format] format
      def create_format_stamp(format)
        create_stamp(format.identifier.to_s) do
          parse_svg(format.layout, '/svg/g')
        end
        format_stamp_registry << format.identifier
      end

      # @return [Array]
      def format_stamp_registry
        @format_stamp_registry ||= []
      end

      # @param [Thinreports::Layout::Format] format
      # @return [Hash]
      def new_basic_page_options(format)
        options = {layout: format.page_orientation.to_sym}

        options[:size] =
          if format.user_paper_type?
            [format.page_width.to_f, format.page_height.to_f]
          else
            case format.page_paper_type
            # Convert B4(5)_ISO to B4(5)
            when 'B4_ISO', 'B5_ISO'
              format.page_paper_type.delete('_ISO')
            # Convert B4(5) to B4(5)_JIS
            when 'B4', 'B5'
              "#{format.page_paper_type}_JIS"
            else
              format.page_paper_type
            end
          end
        options
      end
    end

  end
end