# gems
require 'rubygems'
require 'RMagick'

class ImageFile
  
  attr_reader :image_pool
  
  # properties of image
  attr_reader :size
  attr_reader :width
  attr_reader :height

  #
  # page_url is the url of html page relative to the webroot f.e. "img_88.html"
  #         used to link html pages
  # url is the name of image f.e. "img_88.jpg"
  #         used in the src=<...> of the image tag
  #
  def initialize( image_pool, local_path, src_url, page_url )
    @image_pool = image_pool
    @src_url     = src_url
    @page_url    = page_url

    if not File.exist?(local_path)
      raise RAlbumException.new "file '#{local_path}' not exist"
    end
    if File.directory?(local_path)
      raise RAlbumException.new "expected '#{local_path}' as file but it is a directory"
    end

    image = Magick::Image::read(local_path).first
    @width  = image.columns
    @height = image.rows
    @size = image.filesize / 1024
  end

  #############################################################################
  # properties
  #
  def name
    @image_pool.name
  end
  
  def description
    @image_pool.description
  end

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

  attr_reader :src_url  # path where is the image
  attr_reader :page_url # url of html page displaying the image

  def page_url_from_root
    @image_pool.path + "/" + page_url
  end

  def relroot
    @image_pool.relroot
  end
  
  def relroot_with_prefix
    @image_pool.relroot_with_prefix
  end

  
  def breadcrumbs
    @image_pool.breadcrumbs
  end
      
  def prev_page_url
    if @image_pool.prev
      @image_pool.prev.default_image_file.page_url
    else 
      nil 
    end
  end
  
  def next_page_url
    if @image_pool.next
      @image_pool.next.default_image_file.page_url
    else 
      nil
    end      
  end

end