class LocalResource
  attr_reader :uri

  def initialize(uri)
    @uri = uri
  end

  def file
    @file ||= Tempfile.new(tmp_filename, tmp_folder, encoding: encoding).tap do |f|
      io.rewind
      f.write(io.read)
      f.close
    end
  end

  def io
    @io ||= uri.open
  end

  def encoding
    io.rewind
    io.read.encoding
  end

  def tmp_filename
    [
      Time.now.to_i.to_s,
      Pathname.new(uri.path).extname
    ]
  end

  def tmp_folder
    # If we're using Rails:
    Rails.root.join('tmp')
    # Otherwise:
    # '/wherever/you/want'
  end
end