package com.hubspot.singularity.smtp;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Optional;
import com.hubspot.singularity.ExtendedTaskState;
import com.hubspot.singularity.SingularityDisastersData;
import com.hubspot.singularity.SingularityRequest;
import com.hubspot.singularity.SingularityTask;
import com.hubspot.singularity.SingularityTaskHistory;
import com.hubspot.singularity.SingularityTaskId;
import com.hubspot.singularity.api.SingularityPauseRequest;
import com.hubspot.singularity.api.SingularityScaleRequest;

public class NoopMailer implements SingularityMailer {
  private static final Logger LOG = LoggerFactory.getLogger(NoopMailer.class);

  private static final NoopMailer INSTANCE = new NoopMailer();

  private NoopMailer() {}

  public static NoopMailer getInstance() {
    return INSTANCE;
  }

  @Override
  public void sendTaskOverdueMail(Optional<SingularityTask> task, SingularityTaskId taskId, SingularityRequest request, long runTime, long expectedRuntime) {
    logNotSendingEmail("task overdue");
  }

  @Override
  public void queueTaskCompletedMail(Optional<SingularityTask> task, SingularityTaskId taskId, SingularityRequest request, ExtendedTaskState taskState) {
    logNotSendingEmail("task completed");
  }

  @Override
  public void sendTaskCompletedMail(SingularityTaskHistory taskHistory, SingularityRequest request) {
    logNotSendingEmail("task completed");
  }

  @Override
  public void sendRequestPausedMail(SingularityRequest request, Optional<SingularityPauseRequest> pauseRequest, Optional<String> user) {
    logNotSendingEmail("request paused");
  }

  @Override
  public void sendRequestUnpausedMail(SingularityRequest request, Optional<String> user, Optional<String> message) {
    logNotSendingEmail("request unpaused");
  }

  @Override
  public void sendRequestScaledMail(SingularityRequest request, Optional<SingularityScaleRequest> newScaleRequest, Optional<Integer> formerInstances, Optional<String> user) {
    logNotSendingEmail("request scaled");
  }

  @Override
  public void sendRequestRemovedMail(SingularityRequest request, Optional<String> user, Optional<String> message) {
    logNotSendingEmail("request removed");
  }

  @Override
  public void sendRequestInCooldownMail(SingularityRequest request) {
    logNotSendingEmail("request in cooldown");
  }

  private void logNotSendingEmail(String type) {
    LOG.debug("Not sending " + type + " mail - no SMTP configuration is present");
  }

  @Override
  public void sendDisasterMail(final SingularityDisastersData disastersData) {
    logNotSendingEmail("new disaster");
  }
}