class ActiveFedora::File

def attribute_will_change!(attr)
  if attr == 'content'
    changed_attributes['content'] = true
  else
    super
  end
end

def behaves_like_io?(obj)
  [IO, Tempfile, StringIO].any? { |klass| obj.kind_of? klass } || (defined?(Rack) && obj.is_a?(Rack::Test::UploadedFile))
end

def changed?
  super || content_changed?
end

def check_fixity
  FixityService.new(@ldp_source.subject).check
end

def content_changed?
  return true if new_record? and !local_or_remote_content(false).blank?
  local_or_remote_content(false) != @ds_content
end

def datastream_will_change!
  attribute_will_change! :profile
end

def default_mime_type
  'text/plain'
end

def described_by
  raise "#{self} isn't persisted yet" if new_record?
  links['describedby'].first
end

def digest
  response = metadata.ldp_source.graph.query(predicate: ActiveFedora::RDF::Fcrepo4.digest)
  response.map(&:object)
end

def dirty_size
  content.size if changed? && content.respond_to?(:size)
end

def empty?
  !has_content?
end

def exists!
  @exists = true
end

def fetch_mime_type
  ldp_source.head.headers['Content-Type']
end

def fetch_original_name_from_headers
  return if new_record?
  m = ldp_source.head.headers['Content-Disposition'].match(/filename="(?<filename>[^"]*)";/)
  URI.decode(m[:filename])
end

def freeze
  @frozen = true
end

def frozen?
  !!@frozen
end

def has_content?
  size && size > 0
end

def initialize(parent_or_url_or_hash = nil, path=nil, options={})
  case parent_or_url_or_hash
  when Hash
    content = ''
    @ldp_source = Ldp::Resource::BinarySource.new(ldp_connection, nil, content, ActiveFedora.fedora.host + ActiveFedora.fedora.base_path)
  when nil, String
  #TODO this is similar to Core#build_ldp_resource
    content = ''
    @ldp_source = Ldp::Resource::BinarySource.new(ldp_connection, parent_or_url_or_hash, content, ActiveFedora.fedora.host + ActiveFedora.fedora.base_path)
  when ActiveFedora::Base
    Deprecation.warn File, "Initializing a file by passing a container is deprecated. Initialize with a uri instead. This capability will be removed in active-fedora 10.0"
    uri = if parent_or_url_or_hash.uri.kind_of?(::RDF::URI) && parent_or_url_or_hash.uri.value.empty?
      nil
    else
      "#{parent_or_url_or_hash.uri}/#{path}"
    end
    @ldp_source = Ldp::Resource::BinarySource.new(ldp_connection, uri, nil, ActiveFedora.fedora.host + ActiveFedora.fedora.base_path)
  else
    raise "The first argument to #{self} must be a String or an ActiveFedora::Base. You provided a #{parent_or_url.class}"
  end
  @attributes = {}.with_indifferent_access
end

def inspect
  "#<#{self.class} uri=\"#{uri}\" >"
end

def ldp_connection
  ActiveFedora.fedora.connection
end

def ldp_source
  @ldp_source || raise("NO source")
end

def links
  @links ||= Ldp::Response.links(ldp_source.head)
end

def metadata
  @metadata ||= ActiveFedora::WithMetadata::MetadataNode.new(self)
end

def metadata?
  false
end

def mime_type
  @mime_type ||= fetch_mime_type unless new_record?
  @mime_type || default_mime_type
end

def new_record?
  !@exists && ldp_source.new?
end

def original_name
  @original_name ||= fetch_original_name_from_headers
end

def original_name= name
  @original_name = name
end

def persisted_size
  ldp_source.head.headers['Content-Length'].to_i unless new_record?
end

def prefix(path)
  path ? "#{path.underscore}__" : ''
end

def reload
  return if new_record?
  reset
end

def remote_content
  return if new_record?
  @ds_content ||= retrieve_content
end

def reset
  @ldp_source = Ldp::Resource::BinarySource.new(ldp_connection, uri)
  @original_name = nil
  @mime_type = nil
  @content = nil
  @metadata = nil
end

def serialize!
end

def size
  dirty_size || persisted_size
end

def to_solr(solr_doc={}, opts={})
  solr_doc
end

def uri
  ldp_source.subject
end

def uri= uri
  @ldp_source = Ldp::Resource::BinarySource.new(ldp_connection, uri, '', ActiveFedora.fedora.host + ActiveFedora.fedora.base_path)
end