/*
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 com.dlink.gateway.kubernetes;

import com.dlink.assertion.Asserts;
import com.dlink.gateway.GatewayType;
import com.dlink.gateway.config.AppConfig;
import com.dlink.gateway.result.GatewayResult;
import com.dlink.gateway.result.KubernetesResult;
import com.dlink.model.SystemConfiguration;
import com.dlink.utils.LogUtil;

import org.apache.flink.client.deployment.ClusterSpecification;
import org.apache.flink.client.deployment.application.ApplicationConfiguration;
import org.apache.flink.client.program.ClusterClient;
import org.apache.flink.client.program.ClusterClientProvider;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.DeploymentOptionsInternal;
import org.apache.flink.configuration.GlobalConfiguration;
import org.apache.flink.configuration.JobManagerOptions;
import org.apache.flink.configuration.PipelineOptions;
import org.apache.flink.configuration.TaskManagerOptions;
import org.apache.flink.kubernetes.KubernetesClusterDescriptor;
import org.apache.flink.runtime.client.JobStatusMessage;
import org.apache.http.util.TextUtils;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * KubernetesApplicationGateway
 *
 * @author wenmo
 * @since 2021/12/26 14:59
 */
public class KubernetesApplicationGateway extends KubernetesGateway {

    @Override
    public GatewayType getType() {
        return GatewayType.KUBERNETES_APPLICATION;
    }

    @Override
    public GatewayResult submitJar() {
        if (Asserts.isNull(client)) {
            init();
        }
        KubernetesResult result = KubernetesResult.build(getType());
        AppConfig appConfig = config.getAppConfig();
        String flinkConfigPath = config.getClusterConfig().getFlinkConfigPath();
        Configuration loadConfiguration = GlobalConfiguration.loadConfiguration(flinkConfigPath);
        if (loadConfiguration != null) {
            loadConfiguration.addAll(configuration);
            configuration = loadConfiguration;
        }
        configuration.set(DeploymentOptionsInternal.CONF_DIR, flinkConfigPath);

        configuration.set(PipelineOptions.JARS, Collections.singletonList(appConfig.getUserJarPath()));
        String[] userJarParas = appConfig.getUserJarParas();
        if (Asserts.isNull(userJarParas)) {
            userJarParas = new String[0];
        }
        ApplicationConfiguration applicationConfiguration = new ApplicationConfiguration(userJarParas,
                appConfig.getUserJarMainAppClass());
        KubernetesClusterDescriptor kubernetesClusterDescriptor = new KubernetesClusterDescriptor(configuration,
                client);

        ClusterSpecification.ClusterSpecificationBuilder clusterSpecificationBuilder = new ClusterSpecification.ClusterSpecificationBuilder();
        if (configuration.contains(JobManagerOptions.TOTAL_PROCESS_MEMORY)) {
            clusterSpecificationBuilder
                    .setMasterMemoryMB(configuration.get(JobManagerOptions.TOTAL_PROCESS_MEMORY).getMebiBytes());
        }
        if (configuration.contains(TaskManagerOptions.TOTAL_PROCESS_MEMORY)) {
            clusterSpecificationBuilder
                    .setTaskManagerMemoryMB(configuration.get(TaskManagerOptions.TOTAL_PROCESS_MEMORY).getMebiBytes());
        }
        if (configuration.contains(TaskManagerOptions.NUM_TASK_SLOTS)) {
            clusterSpecificationBuilder.setSlotsPerTaskManager(configuration.get(TaskManagerOptions.NUM_TASK_SLOTS))
                    .createClusterSpecification();
        }

        try {
            ClusterClientProvider<String> clusterClientProvider = kubernetesClusterDescriptor.deployApplicationCluster(
                    clusterSpecificationBuilder.createClusterSpecification(), applicationConfiguration);
            ClusterClient<String> clusterClient = clusterClientProvider.getClusterClient();
            Collection<JobStatusMessage> jobStatusMessages = clusterClient.listJobs().get();
            int counts = SystemConfiguration.getInstances().getJobIdWait();
            while (jobStatusMessages.size() == 0 && counts > 0) {
                Thread.sleep(1000);
                counts--;
                jobStatusMessages = clusterClient.listJobs().get();
                if (jobStatusMessages.size() > 0) {
                    break;
                }
            }
            if (jobStatusMessages.size() > 0) {
                List<String> jids = new ArrayList<>();
                for (JobStatusMessage jobStatusMessage : jobStatusMessages) {
                    jids.add(jobStatusMessage.getJobId().toHexString());
                }
                result.setJids(jids);
            }
            String jobId = "";
            // application mode only have one job, so we can get any one to be jobId
            for (JobStatusMessage jobStatusMessage : jobStatusMessages) {
                jobId = jobStatusMessage.getJobId().toHexString();
            }
            // if JobStatusMessage not have job id, use timestamp
            // and... it`s maybe wrong with submit
            if (TextUtils.isEmpty(jobId)) {
                jobId = "unknown" + System.currentTimeMillis();
            }
            result.setClusterId(jobId);
            result.setWebURL(clusterClient.getWebInterfaceURL());
            result.success();
        } catch (Exception e) {
            result.fail(LogUtil.getError(e));
        } finally {
            kubernetesClusterDescriptor.close();
        }
        return result;
    }
}
