server/task/task-memory/src/main/scala/org/apache/james/task/eventsourcing/DecisionProjection.scala

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package org.apache.james.task.eventsourcing

import org.apache.james.eventsourcing.Event
import org.apache.james.task.TaskManager.Status

case class DecisionProjection(status: Option[Status]) {
  val update: Event => DecisionProjection =
    DecisionProjection.create
}

object DecisionProjection {
  def create(event: Event): DecisionProjection = DecisionProjection(Some(fromEvent(event)))

  def empty: DecisionProjection = DecisionProjection(None)

  private def fromEvent(event: Event): Status = event match {
    case event: Created => Status.WAITING
    case event: Started => Status.IN_PROGRESS
    case event: CancelRequested => Status.CANCEL_REQUESTED
    case event: Cancelled => Status.CANCELLED
    case event: Completed => Status.COMPLETED
    case event: Failed => Status.FAILED
  }
}