# -*- coding: utf-8 -*-
require 'write_xlsx/package/xml_writer_simple'
require 'write_xlsx/utility'

module Writexlsx
  module Package
    class App

      include Writexlsx::Utility

      def initialize
        @writer = Package::XMLWriterSimple.new
        @part_names    = []
        @heading_pairs = []
        @properties    = {}
      end

      def set_xml_writer(filename)
        @writer.set_xml_writer(filename)
      end

      def assemble_xml_file
        write_xml_declaration
        write_properties do
          write_application
          write_doc_security
          write_scale_crop
          write_heading_pairs
          write_titles_of_parts
          write_manager
          write_company
          write_links_up_to_date
          write_shared_doc
          write_hyperlinks_changed
          write_app_version
        end
        @writer.crlf
        @writer.close
      end

      def add_part_name(part_name)
        @part_names.push(part_name)
      end

      def add_heading_pair(heading_pair)
        return if heading_pair[1] == 0

        @heading_pairs.push(['lpstr', heading_pair[0]], ['i4', heading_pair[1]])
      end

      #
      # Set the document properties.
      #
      def set_properties(properties)
        @properties = properties
      end

      private

      def write_xml_declaration
        @writer.xml_decl
      end

      #
      # Write the <Properties> element.
      #
      def write_properties
        tag = 'Properties'

        schema   = 'http://schemas.openxmlformats.org/officeDocument/2006/'
        attributes = [
            'xmlns',     "#{schema}extended-properties",
            'xmlns:vt',  "#{schema}docPropsVTypes"
        ]

        @writer.tag_elements('Properties', attributes) { yield }
      end

      #
      # Write the <Application> element.
      #
      def write_application
        data = 'Microsoft Excel'

        @writer.data_element('Application', data)
      end

      #
      # Write the <DocSecurity> element.
      #
      def write_doc_security
        data = 0

        @writer.data_element('DocSecurity', data)
      end

      #
      # Write the <ScaleCrop> element.
      #
      def write_scale_crop
        data = 'false'

        @writer.data_element('ScaleCrop', data)
      end

      #
      # Write the <HeadingPairs> element.
      #
      def write_heading_pairs
        @writer.tag_elements('HeadingPairs') do
          write_vt_vector('variant', @heading_pairs)
        end
      end

      #
      # Write the <TitlesOfParts> element.
      #
      def write_titles_of_parts
        @writer.tag_elements('TitlesOfParts') do
          parts_data = @part_names.collect { |part_name| ['lpstr', part_name] }
          write_vt_vector('lpstr', parts_data)
        end
      end

      #
      # Write the <vt:vector> element.
      #
      def write_vt_vector(base_type, data)
        attributes = [
          'size',     data.size,
          'baseType', base_type
        ]

        @writer.tag_elements('vt:vector', attributes) do
          data.each do |a|
            if base_type == 'variant'
              @writer.tag_elements('vt:variant') { write_vt_data(*a) }
            else
              write_vt_data(*a)
            end
          end
        end
      end

      #
      # Write the <vt:*> elements such as <vt:lpstr> and <vt:if>.
      #
      def write_vt_data(type, data)
        @writer.data_element("vt:#{type}", data)
      end

      #
      # Write the <Company> element.
      #
      def write_company
        data = @properties[:company] || ''

        @writer.data_element('Company', data)
      end

      #
      # Write the <Manager> element.
      #
      def write_manager
        data = @properties[:manager]

        return unless data

        @writer.data_element('Manager', data)
      end

      #
      # Write the <LinksUpToDate> element.
      #
      def write_links_up_to_date
        data = 'false'

        @writer.data_element('LinksUpToDate', data)
      end

      #
      # Write the <SharedDoc> element.
      #
      def write_shared_doc
        data = 'false'

        @writer.data_element('SharedDoc', data)
      end

      #
      # Write the <HyperlinksChanged> element.
      #
      def write_hyperlinks_changed
        data = 'false'

        @writer.data_element('HyperlinksChanged', data)
      end

      #
      # Write the <AppVersion> element.
      #
      def write_app_version
        data = '12.0000'

        @writer.data_element('AppVersion', data)
      end
    end
  end
end