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/**
 * Copyright 2018 The original 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.ap4k.kubernetes.generator;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;

import javax.lang.model.element.Element;

import io.ap4k.Generator;
import io.ap4k.Resources;
import io.ap4k.SessionListener;
import io.ap4k.WithProject;
import io.ap4k.config.ConfigurationSupplier;
import io.ap4k.deps.kubernetes.api.model.KubernetesList;
import io.ap4k.deps.kubernetes.client.DefaultKubernetesClient;
import io.ap4k.deps.kubernetes.client.KubernetesClient;
import io.ap4k.hook.OrderedHook;
import io.ap4k.hook.ProjectHook;
import io.ap4k.kubernetes.adapter.KubernetesConfigAdapter;
import io.ap4k.kubernetes.annotation.KubernetesApplication;
import io.ap4k.kubernetes.config.KubernetesConfig;
import io.ap4k.kubernetes.configurator.ApplyAutoBuild;
import io.ap4k.kubernetes.configurator.ApplyDockerBuildHook;
import io.ap4k.kubernetes.handler.KubernetesHandler;
import io.ap4k.kubernetes.hook.DockerBuildHook;
import io.ap4k.kubernetes.hook.DockerPushHook;
import io.ap4k.kubernetes.hook.ScaleDeploymentHook;
import io.ap4k.project.ApplyProjectInfo;

public interface KubernetesApplicationGenerator extends Generator, SessionListener, WithProject {

  String KUBERNETES = "kubernetes";

  @Override
  default void add(Map map) {
        add(new ConfigurationSupplier<>(
            KubernetesConfigAdapter
            .newBuilder(propertiesMap(map, KubernetesApplication.class))
            .accept(new ApplyAutoBuild())
            .accept(new ApplyProjectInfo(getProject()))
            .accept(new ApplyDockerBuildHook())));
  }

  default void add(Element element) {
    KubernetesApplication application = element.getAnnotation(KubernetesApplication.class);
     add(new ConfigurationSupplier<>(
            KubernetesConfigAdapter
            .newBuilder(application)
            .accept(new ApplyAutoBuild())
            .accept(new ApplyProjectInfo(getProject()))
            .accept(new ApplyDockerBuildHook())));
  }

  default void add(ConfigurationSupplier config)  {
    session.configurators().add(config);
    session.handlers().add(new KubernetesHandler(session.resources()));
    session.addListener(this);
  }

  default void onClosed() {
    Optional config = session.configurators().get(KubernetesConfig.class);
    if (!config.isPresent()) {
      return;
    }

    KubernetesConfig kubernetesConfig = config.get();
    Resources resources = session.resources();
    if (kubernetesConfig.isAutoPushEnabled()) {
      // When deploy is enabled, we scale the Deployment down before push
      // then scale it back up once the image has been successfully pushed
      // This ensure that the pod runs the proper image
      List hooks = new ArrayList<>();
      if (kubernetesConfig.isAutoDeployEnabled()) {
        KubernetesList generated = session.getGeneratedResources().getOrDefault(KUBERNETES, new KubernetesList());
        try (KubernetesClient client = new DefaultKubernetesClient()) {
          client.resourceList(generated).createOrReplace();
        }
        hooks.add(new ScaleDeploymentHook(getProject(), session.resources().getName(), 0));
      }
      hooks.add(new DockerBuildHook(getProject(), config.get()));
      hooks.add(new DockerPushHook(getProject(), config.get()));
      if (kubernetesConfig.isAutoDeployEnabled()) {
        hooks.add(new ScaleDeploymentHook(getProject(), session.resources().getName(), 1));
      }
      OrderedHook hook = OrderedHook.create(hooks.toArray(new ProjectHook[hooks.size()]));
      hook.register();
    } else if (kubernetesConfig.isAutoBuildEnabled()) {
      DockerBuildHook hook = new DockerBuildHook(getProject(), config.get());
      hook.register();
    }
  }
}