module DockerSigh

# File lib/docker_sigh.rb, line 15
def self.load_tasks(opts)
  extend Rake::DSL
  dockerfile_template = Util::template_url(opts)
  dockerfile = dockerfile_template.gsub("Dockerfile.template.erb", "Dockerfile")

  namespace :ds do
    task :template do
      Util::validate_opts(opts)
      Util::validate_repo(opts)
      LOGGER.debug "Beginning 'template' task."

      template = Erber::Templater.new(IO.read(dockerfile_template), DockerfileMash)
      IO.write(dockerfile, template.render(Util::generate_template_args(opts)))

      LOGGER.debug "Ending 'template' task."
    end
    
    task :build do
      Util::validate_opts(opts)
      Util::validate_repo(opts)
      LOGGER.debug "Beginning 'build' task."
      Dir.chdir(opts[:repository_root]) do
        name = opts[:container_name]

        ret = sh "docker build -t '#{name}:working' ."
        raise "failed to build" unless ret

        [ Util::repo_current_commit(opts),
            Util::tag_from_branch_name(opts),
            Util::repo_current_tags(opts) ].flatten.each do |tag|
          ret = sh "docker tag --force #{name}:working #{name}:#{tag}"
          raise "failed to tag with '#{tag}'" unless ret
        end

        ret = sh "docker rmi #{name}:working"
        raise "failed to rmi working tag" unless ret
      end
      LOGGER.debug "Ending 'build' task."
    end

    task :clean do
      Util::validate_opts(opts)
      LOGGER.debug "Beginning 'clean' task."

      LOGGER.debug "Deleting '#{dockerfile}'."
      FileUtils.rm_f dockerfile

      LOGGER.debug "Ending 'clean' task."
    end

    task :push do
      LOGGER.debug "Beginning 'push' task."
      Dir.chdir(opts[:repository_root]) do
        name = opts[:container_name]
        
        [ Util::repo_current_commit(opts),
            Util::tag_from_branch_name(opts),
            Util::repo_current_tags(opts) ].flatten.each do |tag|

          ret = sh "docker push #{name}:#{tag}"
          raise "failed to push with tag '#{tag}'" unless ret
        end
      end
      LOGGER.debug "Ending 'push' task."
    end

    task :go => [ :template, :build, :clean ]  { }
  end
end