# treevisitor
require 'gf_utilities/md5'
require 'treevisitor/leaf_node'

# ralbum
require 'ralbum'
require 'ralbum/options'
require 'ralbum/ralbum_exception'
require 'ralbum/photo_tree/photo_file'

#
# PhotoTreeItem contains a "photo"
# (it is different from image; only albums contains images)
#
class PhotoTreeItem < LeafNode

  attr_reader :photo_file

  attr_accessor :title
  attr_accessor :description

  def initialize( filename, photo_tree_node )
    @title = nil
    @description = nil
    
    if photo_tree_node.nil?
      raise RAlbumException.new("photo_tree_node cannot be nil")
    end
    if File.dirname( filename ) == "."
      filename = File.join( photo_tree_node.path_with_prefix, filename )
    end
    super( filename, photo_tree_node )
    @photo_file = PhotoFile.new(filename)
  end
  
  def basename
    File.basename( name )
  end

  def to_s
    if title and not title.empty?
      "'#{basename}': '#{title}'"
    else
      "'#{basename}'"
    end
  end

  ############################################################################
  # configurations
      
  def write_xml( xml_el )
    xml_photo = xml_el.add_element( "photo" )            
    xml_photo.add_element("md5").text = md5
    xml_photo.add_element("title").text = name
    xml_photo.add_element("description").text = self["description"]
    xml_photo.add_element("file_date").text = time
    
    xml_exif = xml_photo.add_element("exif")
    xml_exif.add_element("model").text         = self["model"]
    xml_exif.add_element("date_and_time").text = self["date_and_time"]
    xml_exif.add_element("FocalLength").text   = self["FocalLength"]
    xml_exif.add_element("exposure_time").text = self["exposure_time"]
    xml_exif.add_element("white_balance").text = self["white_balance"]
    xml_exif.add_element("iso_speed").text     = self["iso_speed"]
  end

end