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/*
Copyright 2020 The Kubernetes Authors.
Licensed 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 io.kubernetes.client.extended.controller;

import io.kubernetes.client.common.KubernetesObject;
import io.kubernetes.client.extended.controller.reconciler.Request;
import io.kubernetes.client.extended.workqueue.WorkQueue;
import io.kubernetes.client.informer.ResourceEventHandler;
import java.time.Duration;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.function.Predicate;

/**
 * An event handler plumbs work-queue into a controller.
 *
 * @param  the type parameter
 */
public class DefaultControllerWatch
    implements ControllerWatch {

  private final WorkQueue workQueue;
  private final Function workKeyGenerator;

  private Class apiTypeClass;
  private Predicate onAddFilterPredicate;
  private BiPredicate onUpdateFilterPredicate;
  private BiPredicate onDeleteFilterPredicate;
  private Duration resyncPeriod;

  /**
   * Instantiates a new Work queue resource event handler.
   *
   * @param workQueue the work queue
   * @param workKeyGenerator the work key generator
   */
  public DefaultControllerWatch(
      Class apiTypeClass,
      WorkQueue workQueue,
      Function workKeyGenerator,
      Duration resyncPeriod) {
    this.workQueue = workQueue;
    this.apiTypeClass = apiTypeClass;
    this.workKeyGenerator = workKeyGenerator;
    this.resyncPeriod = resyncPeriod;
  }

  public Predicate getOnAddFilterPredicate() {
    return onAddFilterPredicate;
  }

  public void setOnAddFilterPredicate(Predicate onAddFilterPredicate) {
    this.onAddFilterPredicate = onAddFilterPredicate;
  }

  public BiPredicate getOnUpdateFilterPredicate() {
    return onUpdateFilterPredicate;
  }

  public void setOnUpdateFilterPredicate(BiPredicate onUpdateFilterPredicate) {
    this.onUpdateFilterPredicate = onUpdateFilterPredicate;
  }

  public BiPredicate getOnDeleteFilterPredicate() {
    return onDeleteFilterPredicate;
  }

  public void setOnDeleteFilterPredicate(BiPredicate onDeleteFilterPredicate) {
    this.onDeleteFilterPredicate = onDeleteFilterPredicate;
  }

  public Class getApiTypeClass() {
    return apiTypeClass;
  }

  @Override
  public Class getResourceClass() {
    return this.apiTypeClass;
  }

  @Override
  public ResourceEventHandler getResourceEventHandler() {
    return new ResourceEventHandler() {
      @Override
      public void onAdd(ApiType obj) {
        if (onAddFilterPredicate == null || onAddFilterPredicate.test(obj)) {
          Request req = workKeyGenerator.apply(obj);
          if (null != req) {
            workQueue.add(req);
          }
        }
      }

      @Override
      public void onUpdate(ApiType oldObj, ApiType newObj) {
        if (onUpdateFilterPredicate == null || onUpdateFilterPredicate.test(oldObj, newObj)) {
          Request req = workKeyGenerator.apply(newObj);
          if (null != req) {
            workQueue.add(req);
          }
        }
      }

      @Override
      public void onDelete(ApiType obj, boolean deletedFinalStateUnknown) {
        if (onDeleteFilterPredicate == null
            || onDeleteFilterPredicate.test(obj, deletedFinalStateUnknown)) {
          Request req = workKeyGenerator.apply(obj);
          if (null != req) {
            workQueue.add(req);
          }
        }
      }
    };
  }

  @Override
  public Duration getResyncPeriod() {
    return this.resyncPeriod;
  }
}