# ralbum
require 'treevisitor/leaf_node'
  
#
# ImagePool e' creata da una PhotoItem identificata da un md5
# ImagePool ha una 'key' con cui viene identificata nel catalog
# ha un 'title' che e' anche il 'name' del LeafNode
# ha una 'description' della photo che rappresenta
#
class ImagePool < LeafNode
  # include ObjectWithProperties
    
  #
  # md5 of original photo
  #
  attr_reader   :md5
    
  #
  # key (number) assigned by catalog for the original photo
  #
  attr_reader   :key

  # title -> name
  attr_reader   :description

  def initialize( album, md5, key, title, description )
    super( title, album )
    @md5 = md5

    @key = key
    @album = album
    @description = description

    @images = {}
  end

  ############################################################################
  # paths

  def relroot
    parent.relroot
  end
    
  def relroot_with_prefix
    parent.relroot_with_prefix
  end
    
  def breadcrumbs
    parent.breadcrumbs
  end

  ############################################################################
  # images management
  
  def image( type, image_file = nil)
    if image_file
      @images[ type ] = image_file
    end
    res = @images[ type ]
    if res.nil?
      raise "image type '#{type}' of photo '#{name}' not found"
    end
    res
  end

  def default_image_file
    image("default")
  end

  def thumb
    image("thumb")
  end

  ############################################################################

  def to_s
    str = "ip: #{name.to_s} -#{@images.length}-"
    @images.each_key { |key| str += key.to_s }
    str
  end
    
end