module ActiveFedora::File::Persistence

def content
  local_or_remote_content(true)
end

def content= string_or_io
  content_will_change! unless @content == string_or_io
  @content = string_or_io
end

def local_or_remote_content(ensure_fetch = true)
  return @content if new_record?
  @content ||= ensure_fetch ? remote_content : @ds_content
  if behaves_like_io?(@content)
    begin
      @content.rewind
      @content.read
    ensure
      @content.rewind
    end
  else
    @content
  end
  @content
end

def retrieve_content
  ldp_source.get.body
end

def save(*)
  return unless content_changed?
  headers = { 'Content-Type'.freeze => mime_type, 'Content-Length'.freeze => content.size.to_s }
  headers['Content-Disposition'.freeze] = "attachment; filename=\"#{URI.encode(@original_name)}\"" if @original_name
  ldp_source.content = content
  if new_record?
    ldp_source.create do |req|
      req.headers.merge!(headers)
    end
  else
    ldp_source.update do |req|
      req.headers.merge!(headers)
    end
  end
  reset
  changed_attributes.clear
end

def uploaded_file?(payload)
  defined?(ActionDispatch::Http::UploadedFile) and payload.instance_of?(ActionDispatch::Http::UploadedFile)
end