help.scala

package com.cammy.nvr.ws.messages

import argonaut._, Argonaut._
import com.cammy.nvr.domain.dtos.{CameraStatusDto, DeviceStatusDto}
import com.cammy.nvr.domain.manifest.VideoManifest


sealed trait DeviceResponsePayload

case class StatusResponseMessage(cameras: List[CameraStatusDto], device: DeviceStatusDto) extends DeviceResponsePayload
case class VideoChunksPresenceResponseMessage(videoChunks: List[String]) extends DeviceResponsePayload
case class VideoChunksUploadResponseMessage(manifest: VideoManifest) extends DeviceResponsePayload

object DeviceResponsePayload {

  implicit lazy val CodecStatusResponseMessage: CodecJson[StatusResponseMessage] =
    casecodec2(StatusResponseMessage.apply, StatusResponseMessage.unapply)("cameras", "device")

  implicit lazy val CodecVideoChunksPresenceResponseMessage: CodecJson[VideoChunksPresenceResponseMessage] =
    casecodec1(VideoChunksPresenceResponseMessage.apply, VideoChunksPresenceResponseMessage.unapply)("chunks")

  implicit lazy val CodecVideoChunksUploadResponseMessage: CodecJson[VideoChunksUploadResponseMessage] =
    casecodec1(VideoChunksUploadResponseMessage.apply, VideoChunksUploadResponseMessage.unapply)("manifest")

  implicit lazy val CodecDeviceResponsePayload: CodecJson[DeviceResponsePayload] = CodecJson(
    m => {
      val payload = m match {
        case m: StatusResponseMessage              => m.asJson
        case m: VideoChunksPresenceResponseMessage => m.asJson
        case m: VideoChunksUploadResponseMessage   => m.asJson
      }
      Json("payload" -> payload)
    },
    c => {
      val payload = (c --\ "payload")
      // this works.
      payload.as[StatusResponseMessage].map(identity) ||| payload.as[VideoChunksPresenceResponseMessage].map(identity)
      
      // this does not:
      // payload.as[StatusResponseMessage].map(identity) ||| payload.as[VideoChunksPresenceResponseMessage].map(identity) ||| payload.as[VideoChunksUploadResponseMessage].map(identity)
      
    }
  )
}