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/*
 * SonarQube
 * Copyright (C) 2009-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.server.computation.queue;

import com.google.common.base.Optional;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.annotation.Nullable;
import org.sonar.api.ce.ComputeEngineSide;
import org.sonar.api.utils.System2;
import org.sonar.ce.monitoring.CEQueueStatus;
import org.sonar.ce.queue.CeQueueImpl;
import org.sonar.ce.queue.CeQueueListener;
import org.sonar.ce.queue.CeTask;
import org.sonar.ce.queue.CeTaskResult;
import org.sonar.core.util.UuidFactory;
import org.sonar.db.DbClient;
import org.sonar.db.DbSession;
import org.sonar.db.ce.CeActivityDto;
import org.sonar.db.ce.CeQueueDto;

import static java.lang.String.format;

@ComputeEngineSide
public class InternalCeQueueImpl extends CeQueueImpl implements InternalCeQueue {

  private final System2 system2;
  private final DbClient dbClient;
  private final CEQueueStatus queueStatus;

  // state
  private AtomicBoolean peekPaused = new AtomicBoolean(false);

  public InternalCeQueueImpl(System2 system2, DbClient dbClient, UuidFactory uuidFactory,
    CEQueueStatus queueStatus, CeQueueListener[] listeners) {
    super(dbClient, uuidFactory, listeners);
    this.system2 = system2;
    this.dbClient = dbClient;
    this.queueStatus = queueStatus;
  }

  @Override
  public Optional peek() {
    if (peekPaused.get()) {
      return Optional.absent();
    }
    DbSession dbSession = dbClient.openSession(false);
    try {
      Optional dto = dbClient.ceQueueDao().peek(dbSession);
      CeTask task = null;
      if (dto.isPresent()) {
        task = loadTask(dbSession, dto.get());
        queueStatus.addInProgress();
      }
      return Optional.fromNullable(task);

    } finally {
      dbClient.closeSession(dbSession);
    }
  }

  @Override
  public int clear() {
    return cancelAll(true);
  }

  @Override
  public void remove(CeTask task, CeActivityDto.Status status, CeTaskResult taskResult) {
    DbSession dbSession = dbClient.openSession(false);
    try {
      Optional queueDto = dbClient.ceQueueDao().selectByUuid(dbSession, task.getUuid());
      if (!queueDto.isPresent()) {
        throw new IllegalStateException(format("Task does not exist anymore: %s", task));
      }
      CeActivityDto activityDto = new CeActivityDto(queueDto.get());
      activityDto.setStatus(status);
      updateQueueStatus(status, activityDto);
      updateTaskResult(activityDto, taskResult);
      remove(dbSession, task, queueDto.get(), activityDto);

    } finally {
      dbClient.closeSession(dbSession);
    }
  }

  private static void updateTaskResult(CeActivityDto activityDto, @Nullable CeTaskResult taskResult) {
    if (taskResult != null) {
      Long snapshotId = taskResult.getSnapshotId();
      if (snapshotId != null) {
        activityDto.setSnapshotId(snapshotId);
      }
    }
  }

  private void updateQueueStatus(CeActivityDto.Status status, CeActivityDto activityDto) {
    Long startedAt = activityDto.getStartedAt();
    if (startedAt == null) {
      return;
    }
    activityDto.setExecutedAt(system2.now());
    long executionTimeInMs = activityDto.getExecutedAt() - startedAt;
    activityDto.setExecutionTimeMs(executionTimeInMs);
    if (status == CeActivityDto.Status.SUCCESS) {
      queueStatus.addSuccess(executionTimeInMs);
    } else {
      queueStatus.addError(executionTimeInMs);
    }
  }

  @Override
  public void cancel(DbSession dbSession, CeQueueDto ceQueueDto) {
    cancelImpl(dbSession, ceQueueDto);
  }

  @Override
  public void pausePeek() {
    this.peekPaused.set(true);
  }

  @Override
  public void resumePeek() {
    this.peekPaused.set(false);
  }

  @Override
  public boolean isPeekPaused() {
    return peekPaused.get();
  }

}