Activity.scala

import akka.http.scaladsl.model.Uri
import enumeratum.Enum
import enumeratum.EnumEntry

import java.time.ZonedDateTime

object Activity {
  sealed abstract class Type extends EnumEntry.Lowercase
  object Type extends Enum[Type] {
    case object Post extends Type
    case object Comment extends Type

    override def values: IndexedSeq[Type] = findValues
  }

  case class Parent(id: String, author: User)

  object Target {
    sealed abstract class Type extends EnumEntry.Lowercase
    object Type extends Enum[Type] {
      case object Topic extends Type
      case object Group extends Type
      case object User extends Type

      override def values: IndexedSeq[Type] = findValues
    }
  }
  case class Target(id: String, `type`: Target.Type)


  object Content {
    sealed abstract class Attachment
    object Attachment {
      case class Video(video: Uri) extends Attachment
      case class Image(image: Uri) extends Attachment
    }
  }

  case class Content(language: String,
                     text: String,
                     enriched_text: String,
                     attachments: Seq[Content.Attachment])
}

sealed trait Activity {
  def id: String
  def `type`: Activity.Type
  def author: User
  def content: Activity.Content
  def target: Activity.Target
  def created_at: ZonedDateTime
  def version: String
}

case class Post(id: String,
                author: User,
                content: Activity.Content,
                target: Activity.Target,
                created_at: ZonedDateTime,
                version: String = "2") extends Activity {
  val `type`: Activity.Type = Activity.Type.Post
}

case class Comment(id: String,
                   author: User,
                   content: Activity.Content,
                   target: Activity.Target,
                   parent: Activity.Parent,
                   created_at: ZonedDateTime,
                   version: String = "2") extends Activity {
  val `type`: Activity.Type = Activity.Type.Comment
}