require 'active-fedora'
module Cul
module Scv
module Hydra
module Datastreams
class DCMetadata < ::ActiveFedora::OmDatastream

  after_save :action_after_save
  set_terminology do |t|
    t.root(:path=>"dc", :namespace_prefix=>"oai_dc",
           "xmlns:oai_dc"=>"http://www.openarchives.org/OAI/2.0/oai_dc/",
           "xmlns:dc"=>"http://purl.org/dc/elements/1.1/",
           :schema=>"http://www.openarchives.org/OAI/2.0/oai_dc.xsd")
    t.dc_contributor(:path=>"contributor", 
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_coverage(:path=>"coverage",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_creator(:path=>"creator",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_date(:path=>"date",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_description(:path=>"description",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_format(:path=>"format",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_identifier(:path=>"identifier",
      :namespace_prefix=>"dc",
      :type=>:string,
      :index_as=>[:symbol])
    t.dc_language(:path=>"language",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_publisher(:path=>"publisher",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_relation(:path=>"relation",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_rights(:path=>"rights",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_source(:path=>"source",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_subject(:path=>"subject",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_title(:path=>"title",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
    t.dc_type(:path=>"type",
      :namespace_prefix=>"dc",
      :index_as=>[:displayable, :searchable])
  end

  def self.xml_template

    Nokogiri::XML::Document.parse(<<-src
<oai_dc:dc
    xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/'
    xmlns:dc='http://purl.org/dc/elements/1.1/'
    xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
    xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'></oai_dc:dc>
src
)
  end
  # Because FCRepo 3.5+ modifies DC on saves (to ensure that PID is a dc:identifier value),
  # this datastream's content must be reloaded after saves
  def action_after_save
    @content = nil
    @ng_xml = nil
    remove_instance_variable(:@ng_xml)
  end

  def prefix
    if ::ActiveFedora::VERSION >= '8'
      Rails.logger.warn("the prefix method of #{self.class.name} was overriden to maintain backwards compatibility")
    end
    ''
  end

  def method_missing method, *args
    query = false
    _mname = method.id2name
    if _mname[-1,1] == '?'
      query = true
      _mname = _mname[0,_mname.length-1]
    end
    _msym = _mname.to_sym
    has_term = self.class.terminology.has_term?(_msym)
    return false if query and not has_term
    _r = super(_mname.to_sym, *args)
    if query
      _r.length > 0
    else
      _r
    end
  end
end
end
end
end
end