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/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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.fabric8.kubernetes.client.dsl.internal;

import com.squareup.okhttp.OkHttpClient;
import io.fabric8.kubernetes.api.builder.Visitor;
import io.fabric8.kubernetes.api.model.Container;
import io.fabric8.kubernetes.api.model.ContainerBuilder;
import io.fabric8.kubernetes.api.model.extensions.DoneableReplicaSet;
import io.fabric8.kubernetes.api.model.extensions.ReplicaSet;
import io.fabric8.kubernetes.api.model.extensions.ReplicaSetBuilder;
import io.fabric8.kubernetes.api.model.extensions.ReplicaSetList;
import io.fabric8.kubernetes.client.Config;
import io.fabric8.kubernetes.client.KubernetesClientException;
import io.fabric8.kubernetes.client.Watch;
import io.fabric8.kubernetes.client.Watcher;
import io.fabric8.kubernetes.client.dsl.ClientRollableScallableResource;
import io.fabric8.kubernetes.client.dsl.EditReplacePatchDeletable;
import io.fabric8.kubernetes.client.dsl.ImageEditReplacePatchable;
import io.fabric8.kubernetes.client.dsl.Reaper;
import io.fabric8.kubernetes.client.dsl.TimeoutImageEditReplacePatchable;
import io.fabric8.kubernetes.client.dsl.Watchable;
import io.fabric8.kubernetes.client.dsl.base.HasMetadataOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

public class ReplicaSetOperationsImpl extends HasMetadataOperation>
  implements ClientRollableScallableResource,
  TimeoutImageEditReplacePatchable {

  static final transient Logger LOG = LoggerFactory.getLogger(ReplicationControllerOperationsImpl.class);

  private final Boolean rolling;
  private final long rollingTimeout;
  private final TimeUnit rollingTimeUnit;

  public ReplicaSetOperationsImpl(OkHttpClient client, Config config, String namespace) {
    this(client, config, "v1beta1", namespace, null, true, null, null, false, -1, new TreeMap(), new TreeMap(), new TreeMap(), new TreeMap(), new TreeMap(), false, config.getRollingTimeout(), TimeUnit.MILLISECONDS);
  }

  public ReplicaSetOperationsImpl(OkHttpClient client, Config config, String apiVersion, String namespace, String name, Boolean cascading, ReplicaSet item, String resourceVersion, Boolean reloadingFromServer, long gracePeriodSeconds, Map labels, Map labelsNot, Map labelsIn, Map labelsNotIn, Map fields) {
    this(client, config, apiVersion, namespace, name, cascading, item, resourceVersion, reloadingFromServer, gracePeriodSeconds, labels, labelsNot, labelsIn, labelsNotIn, fields, false, config.getRollingTimeout(), TimeUnit.MILLISECONDS);
  }

  public ReplicaSetOperationsImpl(OkHttpClient client, Config config, String apiVersion, String namespace, String name, Boolean cascading, ReplicaSet item, String resourceVersion, Boolean reloadingFromServer, long gracePeriodSeconds, Map labels, Map labelsNot, Map labelsIn, Map labelsNotIn, Map fields, Boolean rolling, long rollingTimeout, TimeUnit rollingTimeUnit) {
    super(client, config, "extensions", apiVersion, "replicasets", namespace, name, cascading, item, resourceVersion, reloadingFromServer, gracePeriodSeconds, labels, labelsNot, labelsIn, labelsNotIn, fields);
    this.rolling = rolling;
    this.rollingTimeout = rollingTimeout;
    this.rollingTimeUnit = rollingTimeUnit;
    reaper = new ReplicaSetReaper(this);
  }

  @Override
  public ImageEditReplacePatchable withTimeout(long timeout, TimeUnit unit) {
    return new ReplicaSetOperationsImpl(client, getConfig(), getAPIVersion(), namespace, getName(), isCascading(), getItem(), getResourceVersion(), isReloadingFromServer(), getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields(), rolling, timeout, unit);
  }

  @Override
  public ImageEditReplacePatchable withTimeoutInMillis(long timeoutInMillis) {
    return new ReplicaSetOperationsImpl(client, getConfig(), getAPIVersion(), namespace, getName(), isCascading(), getItem(), getResourceVersion(), isReloadingFromServer(), getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields(), rolling, timeoutInMillis, TimeUnit.MILLISECONDS);
  }

  @Override
  public ReplicaSet scale(int count) {
    return scale(count, false);
  }

  @Override
  public ClientRollableScallableResource withName(String name) {
    if (name == null || name.length() == 0) {
      throw new IllegalArgumentException("Name must be provided.");
    }
    return new ReplicaSetOperationsImpl(client, getConfig(), getAPIVersion(), getNamespace(), name, isCascading(), getItem(), getResourceVersion(), isReloadingFromServer(), getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields(), rolling, rollingTimeout, rollingTimeUnit);
  }

  @Override
  public ClientRollableScallableResource fromServer() {
    return new ReplicaSetOperationsImpl(client, getConfig(), getAPIVersion(), getNamespace(), getName(), isCascading(), getItem(), getResourceVersion(), true, getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields(), rolling, rollingTimeout, rollingTimeUnit);
  }

  @Override
  public Watchable> withResourceVersion(String resourceVersion) {
    return new ReplicaSetOperationsImpl(client, getConfig(), getAPIVersion(), getNamespace(), getName(), isCascading(), getItem(), resourceVersion, isReloadingFromServer(), getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields(), rolling, rollingTimeout, rollingTimeUnit);
  }

  @Override
  public EditReplacePatchDeletable cascading(boolean enabled) {
    return new ReplicaSetOperationsImpl(client, getConfig(), getAPIVersion(), getNamespace(), getName(), enabled, getItem(), getResourceVersion(), isReloadingFromServer(), getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields(), rolling, rollingTimeout, rollingTimeUnit);
  }

  @Override
  public ReplicaSet scale(int count, boolean wait) {
    ReplicaSet res = cascading(false).edit().editSpec().withReplicas(count).endSpec().done();
    if (wait) {
      waitUntilScaled();
      res = getMandatory();
    }
    return res;
  }

  /**
   * Lets wait until there are enough Ready pods
   */
  private void waitUntilScaled() {
    final CountDownLatch countDownLatch = new CountDownLatch(1);

    final AtomicReference atomicRC = new AtomicReference<>();

    final Runnable rcPoller = new Runnable() {
      public void run() {
        ReplicaSet rc = getMandatory();
        atomicRC.set(rc);
        if (rc.getStatus().getObservedGeneration() >= rc.getMetadata().getGeneration() && Objects.equals(rc.getSpec().getReplicas(), rc.getStatus().getReplicas())) {
          countDownLatch.countDown();
        } else {
          LOG.debug("Only {}/{} replicas scheduled for ReplicaSet: {} in namespace: {} seconds so waiting...",
            rc.getStatus().getReplicas(), rc.getSpec().getReplicas(), rc.getMetadata().getName(), namespace);
        }
      }
    };

    ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
    ScheduledFuture poller = executor.scheduleWithFixedDelay(rcPoller, 0, POLL_INTERVAL_MS, TimeUnit.MILLISECONDS);
    try {
      countDownLatch.await(rollingTimeout, rollingTimeUnit);
      executor.shutdown();
    } catch (InterruptedException e) {
      poller.cancel(true);
      executor.shutdown();
      LOG.error("Only {}/{} pod(s) ready for ReplicaSet: {} in namespace: {}  after waiting for {} seconds so giving up",
        atomicRC.get().getStatus().getReplicas(), atomicRC.get().getSpec().getReplicas(), atomicRC.get().getMetadata().getName(), namespace, rollingTimeUnit.toSeconds(rollingTimeout));
    }
  }

  @Override
  public ReplicaSetOperationsImpl rolling() {
    return new ReplicaSetOperationsImpl(client, getConfig(), getAPIVersion(), getNamespace(), getName(), isCascading(), getItem(), getResourceVersion(), isReloadingFromServer(), getGracePeriodSeconds(), getLabels(), getLabelsNot(), getLabelsIn(), getLabelsNotIn(), getFields(), true, rollingTimeout, rollingTimeUnit);
  }

  @Override
  public ReplicaSet updateImage(String image) {
    ReplicaSet oldRC = get();

    if (oldRC == null) {
      throw new KubernetesClientException("Existing replication controller doesn't exist");
    }
    if (oldRC.getSpec().getTemplate().getSpec().getContainers().size() > 1) {
      throw new KubernetesClientException("Image update is not supported for multicontainer pods");
    }
    if (oldRC.getSpec().getTemplate().getSpec().getContainers().size() == 0) {
      throw new KubernetesClientException("Pod has no containers!");
    }

    Container updatedContainer = new ContainerBuilder(oldRC.getSpec().getTemplate().getSpec().getContainers().iterator().next()).withImage(image).build();

    ReplicaSetBuilder newRCBuilder = new ReplicaSetBuilder(oldRC);
    newRCBuilder.editMetadata().withResourceVersion(null).endMetadata()
      .editSpec().editTemplate().editSpec().withContainers(Collections.singletonList(updatedContainer))
      .endSpec().endTemplate().endSpec();

    return new ReplicaSetRollingUpdater(client, config, namespace).rollUpdate(oldRC, newRCBuilder.build());
  }

  @Override
  public DoneableReplicaSet edit() {
    if (!rolling) {
      return super.edit();
    }

    final Visitor visitor = new Visitor() {
      @Override
      public void visit(ReplicaSet rc) {
        try {
          new ReplicaSetRollingUpdater(client, config, namespace).rollUpdate(getMandatory(), rc);
        } catch (Exception e) {
          throw KubernetesClientException.launderThrowable(e);
        }
      }
    };

    try {
      return getDoneableType().getDeclaredConstructor(getType(), Visitor.class).newInstance(get(), visitor);
    } catch (InvocationTargetException | NoSuchMethodException | IllegalAccessException | InstantiationException e) {
      throw KubernetesClientException.launderThrowable(e);
    }
  }

  @Override
  public ReplicaSet replace(ReplicaSet rc) {
    if (!rolling) {
      return super.replace(rc);
    }
    return new ReplicaSetRollingUpdater(client, config, namespace, rollingTimeUnit.toMillis(rollingTimeout), getConfig().getLoggingInterval()).rollUpdate(getMandatory(), rc);
  }

  @Override
  public ReplicaSet patch(ReplicaSet rc) {
    if (!rolling) {
      return super.patch(rc);
    }
    return new ReplicaSetRollingUpdater(client, config, namespace, rollingTimeUnit.toMillis(rollingTimeout), getConfig().getLoggingInterval()).rollUpdate(getMandatory(), rc);
  }

  private static class ReplicaSetReaper implements Reaper {
    private ReplicaSetOperationsImpl oper;

    public ReplicaSetReaper(ReplicaSetOperationsImpl oper) {
      this.oper = oper;
    }

    @Override
    public void reap() {
      oper.scale(0, true);
    }
  }
}