def ascertainTarget()

in app/services/NewProjectBackup.scala [124:165]
42 lines of code
5 McCabe index (conditional complexity)

  def ascertainTarget(maybeSourceFileEntry:Option[FileEntry], maybePrevDestEntry:Option[FileEntry], destStorage:StorageEntry):Future[FileEntry] = {
    logger.warn(s"In ascertainTarget. maybePrevDestEntry - ${maybePrevDestEntry}")
    (maybeSourceFileEntry, maybePrevDestEntry) match {
      case (Some(sourceEntry), Some(prevDestEntry))=>
        logger.debug(s"${sourceEntry.filepath}: prevDestEntry is $prevDestEntry")
        if(destStorage.supportsVersions) {
          val intendedTarget = prevDestEntry.copy(id=None,
            storageId=destStorage.id.get,
            version = prevDestEntry.version+1,
            mtime=Timestamp.from(Instant.now()),
            atime=Timestamp.from(Instant.now()),
            hasContent = false,
            hasLink = true,
            backupOf = sourceEntry.id) // check
          findAvailableVersion(destStorage, intendedTarget)
            .map(correctedTarget=>{
              logger.debug(s"Destination storage ${destStorage.id} ${destStorage.rootpath} supports versioning, nothing will be over-written. Target version number is ${correctedTarget.version+1}")
              correctedTarget
            })
        } else {
          logger.warn(s"Backup destination storage ${destStorage.id} ${destStorage.rootpath} does not support versioning, so last backup will get over-written")
          Future(prevDestEntry.copy(
            mtime=Timestamp.from(Instant.now()),
            atime=Timestamp.from(Instant.now())
          ))
        }
      case (Some(sourceEntry), None)=>
        logger.debug(s"${sourceEntry.filepath}: no prev dest entry")
        Future(
          sourceEntry.copy(id=None,
            storageId=destStorage.id.get,
            version=1,
            mtime=Timestamp.from(Instant.now()),
            atime=Timestamp.from(Instant.now()),
            hasContent=false,
            hasLink=true,
            backupOf = sourceEntry.id)
        )
      case (None, _)=>
        throw new RuntimeException("Can't back up as source file was not found")  //fail the Future
    }
  }