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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.dekorate.testing.openshift;

import io.fabric8.kubernetes.api.model.EndpointSubset;
import io.fabric8.kubernetes.api.model.Endpoints;
import io.fabric8.kubernetes.api.model.HasMetadata;
import io.fabric8.kubernetes.api.model.Pod;
import io.fabric8.kubernetes.api.model.PodCondition;
import io.fabric8.kubernetes.api.model.Node;
import io.fabric8.kubernetes.api.model.NodeCondition;
import io.fabric8.kubernetes.api.model.ReplicationController;
import io.fabric8.kubernetes.api.model.ReplicationControllerSpec;
import io.fabric8.kubernetes.api.model.ReplicationControllerStatus;
import io.fabric8.kubernetes.api.model.apps.Deployment;
import io.fabric8.kubernetes.api.model.apps.DeploymentSpec;
import io.fabric8.kubernetes.api.model.apps.DeploymentStatus;
import io.fabric8.kubernetes.api.model.apps.ReplicaSet;
import io.fabric8.kubernetes.api.model.apps.ReplicaSetSpec;
import io.fabric8.kubernetes.api.model.apps.ReplicaSetStatus;
import io.fabric8.kubernetes.api.model.apps.StatefulSet;
import io.fabric8.kubernetes.api.model.apps.StatefulSetSpec;
import io.fabric8.kubernetes.api.model.apps.StatefulSetStatus;
import io.fabric8.kubernetes.client.internal.readiness.Readiness;
import io.fabric8.kubernetes.client.utils.Utils;
import io.fabric8.openshift.api.model.DeploymentConfig;
import io.fabric8.openshift.api.model.DeploymentConfigSpec;
import io.fabric8.openshift.api.model.DeploymentConfigStatus;

public class OpenshiftReadiness {

  private static final String POD_READY = "Ready";
  private static final String NODE_READY = "Ready";
  private static final String TRUE = "True";


  public static boolean isReadinessApplicable(Class itemClass) {
    return DeploymentConfig.class.isAssignableFrom(itemClass) || Readiness.isReadinessApplicable(itemClass);
  }

  public static boolean isReady(HasMetadata item) {
    if (isReadiableKubernetesResource(item)) {
      return isKubernetesResourceReady(item);
    } else if (isReadiableOpenshiftResource(item)) {
      return isOpenshiftResourceReady(item);
    } else {
      throw new IllegalArgumentException("Item needs to be one of [Node, Deployment, ReplicaSet, StatefulSet, Pod, ReplicationController], but was: [" + (item != null ? item.getKind() : "Unknown (null)") + "]");
    }
  }

  private static boolean isKubernetesResourceReady(HasMetadata item) {

    if (item instanceof Deployment) {
      return Readiness.isDeploymentReady((Deployment) item);
    } else if (item instanceof io.fabric8.kubernetes.api.model.extensions.Deployment) {
      return Readiness.isExtensionsDeploymentReady((io.fabric8.kubernetes.api.model.extensions.Deployment) item);
    } else if (item instanceof ReplicaSet) {
      return Readiness.isReplicaSetReady((ReplicaSet) item);
    } else if (item instanceof Pod) {
      return Readiness.isPodReady((Pod) item);
    } else if (item instanceof ReplicationController) {
      return Readiness.isReplicationControllerReady((ReplicationController) item);
    } else if (item instanceof Endpoints) {
      return Readiness.isEndpointsReady((Endpoints) item);
    } else if (item instanceof Node) {
      return Readiness.isNodeReady((Node) item);
    } else if (item instanceof StatefulSet) {
      return Readiness.isStatefulSetReady((StatefulSet) item);
    }
    return false;
  }

  private static boolean isOpenshiftResourceReady(HasMetadata item) {
    if (item instanceof DeploymentConfig) {
      return isDeploymentConfigReady((DeploymentConfig) item);
    }
    return false;
  }

  protected static boolean isReadiableKubernetesResource(HasMetadata item) {
    return (item instanceof Deployment ||
      item instanceof io.fabric8.kubernetes.api.model.extensions.Deployment ||
    item instanceof ReplicaSet ||
    item instanceof Pod ||
    item instanceof ReplicationController ||
    item instanceof Endpoints ||
    item instanceof Node ||
    item instanceof StatefulSet);
  }

  protected static boolean isReadiableOpenshiftResource(HasMetadata item) {
    return item instanceof DeploymentConfig;
  }

  public static boolean isDeploymentConfigReady(DeploymentConfig d) {
    Utils.checkNotNull(d, "Deployment can't be null.");
    DeploymentConfigSpec spec = d.getSpec();
    DeploymentConfigStatus status = d.getStatus();

    if (status == null || status.getReplicas() == null || status.getAvailableReplicas() == null) {
      return false;
    }

    //Can be true in testing, so handle it to make test writing easier.
    if (spec == null || spec.getReplicas() == null) {
      return false;
    }

    return spec.getReplicas().intValue() == status.getReplicas() &&
      spec.getReplicas().intValue() <= status.getAvailableReplicas();
  }

}