module Cul::Scv::Hydra::Models::ImageResource
  IMAGE_EXT = {"image/bmp" => 'bmp', "image/gif" => 'gif', "image/jpeg" => 'jpg', "image/png" => 'png', "image/tiff" => 'tif', "image/x-windows-bmp" => 'bmp', 'image/jp2' => 'jp2'}
  WIDTH = RDF::URI(ActiveFedora::Predicates.find_graph_predicate(:image_width))
  LENGTH = RDF::URI(ActiveFedora::Predicates.find_graph_predicate(:image_length))
  WIDTH_PREDICATE = ActiveFedora::Predicates.short_predicate("http://www.w3.org/2003/12/exif/ns#imageWidth").to_s
  LENGTH_PREDICATE = ActiveFedora::Predicates.short_predicate("http://www.w3.org/2003/12/exif/ns#imageLength").to_s
  EXTENT_PREDICATE = ActiveFedora::Predicates.short_predicate("http://purl.org/dc/terms/extent").to_s
  FORMAT_OF_PREDICATE = ActiveFedora::Predicates.short_predicate("http://purl.org/dc/terms/isFormatOf").to_s
  FORMAT_URI = RDF::URI("http://purl.org/dc/terms/format")

  DJATOKA_THUMBNAIL_PARMS = {
    "url_ver" => "Z39.88-2004",
    "svc_id" => "info:lanl-repo/svc/getRegion",
    "svc_val_fmt" => "info:ofi/fmt:kev:mtx:jpeg2000",
    "svc.format" => "image/jpeg",
    "svc.level" => "",
    "svc.rotate" => "0",
    "svc.scale" => "200",
    "svc.clayers" => ""
  }

  DJATOKA_BASE_URL = "http://iris.cul.columbia.edu:8888/resolve"

  def long
    @long_side ||= max(width(), length())
  end

  def width
    @width ||= begin
      ds = datastreams["content"]
      width = 0
      unless ds.nil? or rels_int.relationships(ds,:exif_image_width).blank?
        width = rels_int.relationships(ds,:exif_image_width).first.object.to_s.to_i
      end
      width = relationships(:image_width).first.to_s.to_i if width == 0
      width
    end
  end

  def length
    @length ||= begin
      ds = datastreams["content"]
      length = 0
      unless ds.nil? or rels_int.relationships(ds,:exif_image_length).blank?
        length = rels_int.relationships(ds,:exif_image_length).first.object.to_s.to_i
      end
      length = relationships(:image_length).first.to_s.to_i if length == 0
      length
    end
  end

  def zooming?
    zoom = rels_int.relationships(datastreams['content'],:foaf_zooming).first
    return zoom.object.to_s if zoom
    datastreams.each do |k,v|
      if v.mimeType =~ /image\/jp2$/i
        zoom = "info:fedora/#{k.dsid}"
      end
    end
    return zoom
  end

  def thumbnail_info
    thumb = rels_int.relationships(datastreams['content'],:foaf_thumbnail).first
    if thumb
      t_dsid = thumb.object.to_s.split('/')[-1]
      t_url = "#{ActiveFedora.fedora_config.credentials[:url]}/objects/#{pid}/datastreams/#{t_dsid}/content"
      return {:url=>t_url,:mime=>datastreams[t_dsid].mimeType}
    elsif (zoom = self.zooming?)
      t_dsid = zoom.split('/')[-1]
      t_parms = DJATOKA_THUMBNAIL_PARMS.merge({"rft_id" => datastreams[t_dsid].dsLocation})
      url = "#{DJATOKA_BASE_URL}?#{options.map { |key, value|  "#{CGI::escape(key.to_s)}=#{CGI::escape(value.to_s)}"}.join("&")  }"
      {:url => url, :mime => t_parms["svc.format"]}
    else
      return {:url=>image_url("cul_scv_hydra/crystal/file.png",:mime=>'image/png'}
    end
  end
end