require 'tempfile'
require 'fileutils'

module Vx ; module Lib ; module Container ;

  class Local

    include Lib::Container::Instrument

    autoload :Spawner, File.expand_path("../local/spawner", __FILE__)

    attr_reader :work_dir

    def initialize(options = {})
      @work_dir = options[:work_dir] || default_work_dir
      @work_dir = File.expand_path(@work_dir)
    end

    def start(&block)
      instrument( "create", container_type: 'local', container: { work_dir: work_dir }) do
        FileUtils.rm_rf(work_dir)
        FileUtils.mkdir_p(work_dir)
      end

      begin
        spawner = Spawner.new(work_dir)
        yield spawner
      ensure
        instrument( "kill", container_type: 'local', container: { work_dir: work_dir }) do
          FileUtils.mkdir_p(work_dir)
        end
      end
    end

    private

    def default_work_dir
      "#{::Dir.tmpdir}/vx_lib_container_#{::Process.pid}"
    end

  end

end ; end ; end