page fragments.scala

case class PermalinkPageData(
	post: Post,
	comments: ReplyList,
	sidebar: Sidebar)
	
class PermalinkPageDataSoy extends SoyWrites[PermalinkPageData] {
	def toSoy: Future[SoyMap] = Soy.future {
		"post" -> post.toSoy,
		"comments" -> comments.toSoy,
		"sidebar" -> sidebar.render.map(SoyString(_))
	}
}
	
case class SidebarData(
	titles: Future[List[String]])

class SidebarDataSoy extends SoyWrites[SidebarData] {
	def toSoy = Soy.map {
		"titles" -> titles.toSoy
	}
}

trait PageFragment {
	val render: Future[String] = data.map(Closure.render(template, _.toSoy))
}
	
class PermalinkPage(postId: Id) extends PageFragment {
	val template = "permalink.soy"

	val data: Future[PermalinkPageData] =
		async {
			val post = PostApiClient.getPost(postId)
			val comments = ReplyApiClient.getReplies(postId)
			val sidebar = new Sidebar(post.authorId)
			(post, comments, sidebar)
		} map {
			case(post, comments, sidebar) =>
				PermalinkPageData(
					post = post,
					comments = comments,
					sidebar = sidebar)
		}
}

class Sidebar(authorId: Id) extends PageFragment {
	val template = "sidebar.soy"

	val data: Future[SidebarData] = 
		SidebarApiClient.getTitles(authorId).map {
			SidebarData(titles = _).toSoy
		}
}


object PermalinkController {
	def permalinkPage(postId: Id) = new PermalinkPage(postId).render.map(SimpleResult(_))
}