# encoding: utf-8
module GpxTrackGenerator
  # A gpx file
  class GpxFile
    private

    attr_reader :path

    public

    def initialize(path)
      @path = path
    end

    # Return nodes
    def nodes
      document = Nokogiri::XML('')
      node_set = Nokogiri::XML::NodeSet.new(document)

      node_set += extract_route_nodes unless extract_route_nodes.empty?
      node_set += extract_track_nodes unless extract_track_nodes.empty?

      node_set.css('trkpt').each_with_index { |e, i| e.css('name').first.content = "WP #{i + 1}" }

      node_set
    end

    # Return file name
    def file_name
      File.basename(path)
    end

    private

    def extract_route_nodes
      node_set = Nokogiri::XML(File.open(path)).remove_namespaces!.css('rtept')
      node_set.each { |n| n.name = 'trkpt' }

      node_set
    end

    def extract_track_nodes
      node_set = Nokogiri::XML(File.open(path)).remove_namespaces!.css('trkpt')
      node_set.each { |n| n.name = 'trkpt' }

      node_set
    end
  end
end