module ActiveFedora::File::Attributes

def assign_attributes(_)
  # nop
end

def create_date
  created = metadata.attributes["http://fedora.info/definitions/v4/repository#created"]
  created&.first
end

def default_mime_type
  'text/plain'
end

def digest
  response = metadata.ldp_source.graph.query({ predicate: RDF::Vocab::PREMIS.hasMessageDigest })
  # fallback on old predicate for checksum
  response = metadata.ldp_source.graph.query({ predicate: fallback_digest_predicate }) if response.empty?
  response.map(&:object)
end

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

def empty?
  !has_content?
end

def fallback_digest_predicate
  @fallback_digest ||= if RDF::Vocab::Fcrepo4.respond_to? :digest
                         RDF::Vocab::Fcrepo4.digest
                       else
                         ::RDF::URI("http://fedora.info/definitions/v4/repository#digest")
                       end
end

def fetch_mime_type
  return default_mime_type if new_record? && metadata.mime_type.blank?
  metadata.mime_type.first
end

def fetch_original_name
  return if new_record?
  ldp_source.head.content_disposition_filename
end

def has_content?
  size&.positive?
end

def links
  @links ||= ldp_source.head.links
end

def mime_type
  fetch_mime_type
end

def modified_date
  modified = metadata.attributes["http://fedora.info/definitions/v4/repository#lastModified"]
  modified&.first
end

def original_name
  @original_name ||= fetch_original_name
end

def original_name=(name)
  @original_name = name
end

def persisted_size
  ldp_source.head.content_length unless new_record?
end

def size
  dirty_size || persisted_size
end