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package com.datastax.insight.core.driver;

import com.datastax.insight.core.conf.Configuration;
import com.datastax.util.io.FileUtil;
import com.datastax.util.lang.ProcessStreamHandler;
import com.datastax.util.lang.ProcessUtil;
import com.datastax.util.lang.StringUtil;
import com.google.common.base.Strings;
import org.apache.spark.launcher.SparkLauncher;

import java.io.File;
import java.nio.file.Paths;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import static com.datastax.insight.core.Consts.DELIMITER;

/**
 * User: Anders Hong
 * Date: 07/09/2016
 * Time: 16:29
 */
public class Launcher {
    public static final int INTERVAL=5000;

    public static boolean launch(Configuration configuration, SparkConfig sparkAction, String logId) {
        Map env=new HashMap<>();
        env.put("hadoop.home.dir", configuration.getHadoopHome());
        env.put("HADOOP_HOME", configuration.getHadoopHome());
        env.put("spark.home.dir", configuration.getSparkHome());
        env.put("SPARK_HOME", configuration.getSparkHome());
        env.put("HADOOP_CONF_DIR", configuration.getHadoopConfDir());

        if(!Strings.isNullOrEmpty(configuration.getYarnConfDir())) {
            env.put("YARN_CONF_DIR", configuration.getYarnConfDir());
        }
        env.put("HADOOP_USER_NAME", configuration.getHadoopUserName());

        try {
            SparkLauncher launcher = new SparkLauncher(env);

            if(!Strings.isNullOrEmpty(configuration.getJars())) {
                launcher = launcher.addJar(configuration.getJars());
            }

            launcher = launcher.setAppName("spark-app-" + sparkAction.getAppArgs().get(7))
                    .setAppResource(sparkAction.getAppResource())
                    .setMainClass(sparkAction.getMainClass())
                    .setMaster(sparkAction.getMaster())
                    .setVerbose(sparkAction.isVerbose());
            if(sparkAction.getDeployMode()!=null){
                launcher=launcher.setDeployMode(sparkAction.getDeployMode());
            }
            for(String key : sparkAction.getConfMap().keySet()){
                launcher=launcher.setConf(key, sparkAction.getConfMap().get(key));
            }
            if(sparkAction.getAppArgs()!=null) {
                for (String arg : sparkAction.getAppArgs()) {
                    launcher=launcher.addAppArgs(arg);
                }
            }
            if (configuration.getQueue() != null) {
                launcher = launcher.addSparkArg("--conf","spark.yarn.queue"+ "=" + configuration.getQueue());
            }

            Process process = launcher.launch();

            File logFile = Paths.get(configuration.getLogDir(), logId+".log").toFile();
            DateFormat dFormat = new SimpleDateFormat("yy/MM/dd HH:mm:ss");
            ProcessStreamHandler handler = "yarn".equals(sparkAction.getMaster())
                    ? line -> FileUtil.writeFile(logFile,dFormat.format(new Date()) + DELIMITER + line + "\r\n",true)
                    : line -> FileUtil.writeFile(logFile,line + "\r\n",true);

            ProcessUtil processUtil=new ProcessUtil(handler);
            processUtil.unblock(process);
            System.out.println("launcher over");

            File stdoutLogFile = Paths.get(configuration.getLogDir(), logId+".stdout").toFile();
            return flowResult(stdoutLogFile);

            /*SparkAppHandle handle = launcher.startApplication();
            while (!handle.getState().isFinal()) {
                Thread.sleep(INTERVAL);
            }

            if (!handle.getState().equals(SparkAppHandle.State.FINISHED)) {
                return false;
            }*/
        } catch (Exception ex){
            ex.printStackTrace();
            return false;
        }
    }

    public static void newThread(Configuration configuration, SparkConfig sparkConfig, String logId){
        Thread thread=new Thread(new Runnable() {
            @Override
            public void run() {
                launch(configuration,sparkConfig,logId);
            }
        });
        thread.start();
    }

    private static boolean flowResult(File file) {
        if (file.exists()) {
            String fileData = FileUtil.readFile(file);
            if (fileData.contains("Exception")) {
                return false;
            }
        } else {
            return false;
        }
        return true;
    }

}