/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.texera.amber.engine.architecture.controller.promisehandlers

import com.twitter.util.Future
import org.apache.texera.amber.engine.architecture.controller.{
  ControllerAsyncRPCHandlerInitializer,
  ExecutionStatsUpdate,
  RuntimeStatisticsPersist
}
import org.apache.texera.amber.engine.architecture.rpc.controlcommands.{
  AsyncRPCContext,
  EmptyRequest
}
import org.apache.texera.amber.engine.architecture.rpc.controlreturns.EmptyReturn
import org.apache.texera.amber.util.VirtualIdentityUtils

/** resume the entire workflow
  *
  * possible sender: controller, client
  */
trait ResumeHandler {
  this: ControllerAsyncRPCHandlerInitializer =>

  override def resumeWorkflow(msg: EmptyRequest, ctx: AsyncRPCContext): Future[EmptyReturn] = {
    // send all workers resume
    // resume message has no effect on non-paused workers
    Future
      .collect(
        cp.workflowExecution.getRunningRegionExecutions
          .flatMap(_.getAllOperatorExecutions.map(_._2))
          .flatMap(_.getWorkerIds)
          .map { workerId =>
            workerInterface.resumeWorker(EmptyRequest(), mkContext(workerId)).map { resp =>
              cp.workflowExecution
                .getLatestOperatorExecution(VirtualIdentityUtils.getPhysicalOpId(workerId))
                .getWorkerExecution(workerId)
                .update(System.nanoTime(), resp.state)
            }
          }
          .toSeq
      )
      .map { _ =>
        // update frontend status and persist statistics
        val stats = cp.workflowExecution.getAllRegionExecutionsStats
        sendToClient(ExecutionStatsUpdate(stats))
        sendToClient(RuntimeStatisticsPersist(stats))
        cp.controllerTimerService
          .enableStatusUpdate() //re-enabled it since it is disabled in pause
        cp.controllerTimerService
          .enableRuntimeStatisticsCollection() //re-enabled it since it is disabled in pause
        EmptyReturn()
      }
  }

}
