/**
 * 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 backtype.storm;

import java.io.File;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.thrift.TException;
import org.json.simple.JSONValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import backtype.storm.generated.AlreadyAliveException;
import backtype.storm.generated.ClusterSummary;
import backtype.storm.generated.InvalidTopologyException;
import backtype.storm.generated.Nimbus;
import backtype.storm.generated.StormTopology;
import backtype.storm.generated.SubmitOptions;
import backtype.storm.generated.TopologySummary;
import backtype.storm.utils.BufferFileInputStream;
import backtype.storm.utils.NimbusClient;
import backtype.storm.utils.Utils;

/**
 * Use this class to submit topologies to run on the Storm cluster. You should run your program
 * with the "storm jar" command from the command-line, and then use this class to
 * submit your topologies.
 */
public class StormSubmitter {
    public static Logger LOG = LoggerFactory.getLogger(StormSubmitter.class);    

    private static final int THRIFT_CHUNK_SIZE_BYTES = 307200;
    
    private static Nimbus.Iface localNimbus = null;

    public static void setLocalNimbus(Nimbus.Iface localNimbusHandler) {
        StormSubmitter.localNimbus = localNimbusHandler;
    }

    /**
     * Submits a topology to run on the cluster. A topology runs forever or until 
     * explicitly killed.
     *
     *
     * @param name the name of the storm.
     * @param stormConf the topology-specific configuration. See {@link Config}. 
     * @param topology the processing to execute.
     * @throws AlreadyAliveException if a topology with this name is already running
     * @throws InvalidTopologyException if an invalid topology was submitted
     */
    public static void submitTopology(String name, Map stormConf, StormTopology topology) throws AlreadyAliveException, InvalidTopologyException {
        submitTopology(name, stormConf, topology, null, null);
    }    

    /**
     * Submits a topology to run on the cluster. A topology runs forever or until
     * explicitly killed.
     *
     *
     * @param name the name of the storm.
     * @param stormConf the topology-specific configuration. See {@link Config}.
     * @param topology the processing to execute.
     * @param opts to manipulate the starting of the topology
     * @param progressListener to track the progress of the jar upload process
     * @throws AlreadyAliveException if a topology with this name is already running
     * @throws InvalidTopologyException if an invalid topology was submitted
     */
    public static void submitTopology(String name, Map stormConf, StormTopology topology, SubmitOptions opts, ProgressListener progressListener) throws AlreadyAliveException, InvalidTopologyException {
        if(!Utils.isValidConf(stormConf)) {
            throw new IllegalArgumentException("Storm conf is not valid. Must be json-serializable");
        }
        stormConf = new HashMap(stormConf);
        stormConf.putAll(Utils.readCommandLineOpts());
        Map conf = Utils.readStormConfig();
        conf.putAll(stormConf);
        try {
            String serConf = JSONValue.toJSONString(stormConf);
            if(localNimbus!=null) {
                LOG.info("Submitting topology " + name + " in local mode");
                localNimbus.submitTopology(name, null, serConf, topology);
            } else {
                NimbusClient client = NimbusClient.getConfiguredClient(conf);
                if(topologyNameExists(conf, name)) {
                    throw new RuntimeException("Topology with name `" + name + "` already exists on cluster");
                }
                submitJar(conf, progressListener);
                try {
                    LOG.info("Submitting topology " +  name + " in distributed mode with conf " + serConf);
                    if(opts!=null) {
                        client.getClient().submitTopologyWithOpts(name, submittedJar, serConf, topology, opts);
                    } else {
                        // this is for backwards compatibility
                        client.getClient().submitTopology(name, submittedJar, serConf, topology);
                    }
                } catch(InvalidTopologyException e) {
                    LOG.warn("Topology submission exception: "+e.get_msg());
                    throw e;
                } catch(AlreadyAliveException e) {
                    LOG.warn("Topology already alive exception", e);
                    throw e;
                } finally {
                    client.close();
                }
            }
            LOG.info("Finished submitting topology: " +  name);
        } catch(TException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Submits a topology to run on the cluster with a progress bar. A topology runs forever or until
     * explicitly killed.
     *
     *
     * @param name the name of the storm.
     * @param stormConf the topology-specific configuration. See {@link Config}.
     * @param topology the processing to execute.
     * @throws AlreadyAliveException if a topology with this name is already running
     * @throws InvalidTopologyException if an invalid topology was submitted
     */

    public static void submitTopologyWithProgressBar(String name, Map stormConf, StormTopology topology) throws AlreadyAliveException, InvalidTopologyException {
        submitTopologyWithProgressBar(name, stormConf, topology, null);
    }

    /**
     * Submits a topology to run on the cluster with a progress bar. A topology runs forever or until
     * explicitly killed.
     *
     *
     * @param name the name of the storm.
     * @param stormConf the topology-specific configuration. See {@link Config}.
     * @param topology the processing to execute.
     * @param opts to manipulate the starting of the topology
     * @throws AlreadyAliveException if a topology with this name is already running
     * @throws InvalidTopologyException if an invalid topology was submitted
     */

    public static void submitTopologyWithProgressBar(String name, Map stormConf, StormTopology topology, SubmitOptions opts) throws AlreadyAliveException, InvalidTopologyException {
        // show a progress bar so we know we're not stuck (especially on slow connections)
        submitTopology(name, stormConf, topology, opts, new StormSubmitter.ProgressListener() {
            @Override
            public void onStart(String srcFile, String targetFile, long totalBytes) {
                System.out.printf("Start uploading file '%s' to '%s' (%d bytes)\n", srcFile, targetFile, totalBytes);
            }

            @Override
            public void onProgress(String srcFile, String targetFile, long bytesUploaded, long totalBytes) {
                int length = 50;
                int p = (int)((length * bytesUploaded) / totalBytes);
                String progress = StringUtils.repeat("=", p);
                String todo = StringUtils.repeat(" ", length - p);

                System.out.printf("\r[%s%s] %d / %d", progress, todo, bytesUploaded, totalBytes);
            }

            @Override
            public void onCompleted(String srcFile, String targetFile, long totalBytes) {
                System.out.printf("\nFile '%s' uploaded to '%s' (%d bytes)\n", srcFile, targetFile, totalBytes);
            }
        });
    }

    private static boolean topologyNameExists(Map conf, String name) {
        NimbusClient client = NimbusClient.getConfiguredClient(conf);
        try {
            ClusterSummary summary = client.getClient().getClusterInfo();
            for(TopologySummary s : summary.get_topologies()) {
                if(s.get_name().equals(name)) {  
                    return true;
                } 
            }  
            return false;

        } catch(Exception e) {
            throw new RuntimeException(e);
        } finally {
            client.close();
        }
    }

    private static String submittedJar = null;

    private static void submitJar(Map conf, ProgressListener listener) {
        if(submittedJar==null) {
            LOG.info("Jar not uploaded to master yet. Submitting jar...");
            String localJar = System.getProperty("storm.jar");
            submittedJar = submitJar(conf, localJar, listener);
        } else {
            LOG.info("Jar already uploaded to master. Not submitting jar.");
        }
    }

    /**
     * Submit jar file
     * @param conf the topology-specific configuration. See {@link Config}.
     * @param localJar file path of the jar file to submit
     * @return the remote location of the submitted jar
     */
    public static String submitJar(Map conf, String localJar) {
        return submitJar(conf, localJar, null);
    }

    /**
     * Submit jar file
     * @param conf the topology-specific configuration. See {@link Config}.
     * @param localJar file path of the jar file to submit
     * @param listener progress listener to track the jar file upload
     * @return the remote location of the submitted jar
     */
    public static String submitJar(Map conf, String localJar, ProgressListener listener) {
        if (localJar == null) {
            throw new RuntimeException("Must submit topologies using the 'storm' client script so that StormSubmitter knows which jar to upload.");
        }

        NimbusClient client = NimbusClient.getConfiguredClient(conf);
        try {
            String uploadLocation = client.getClient().beginFileUpload();
            LOG.info("Uploading topology jar " + localJar + " to assigned location: " + uploadLocation);
            BufferFileInputStream is = new BufferFileInputStream(localJar, THRIFT_CHUNK_SIZE_BYTES);

            long totalSize = new File(localJar).length();
            if (listener != null) {
                listener.onStart(localJar, uploadLocation, totalSize);
            }

            long bytesUploaded = 0;
            while(true) {
                byte[] toSubmit = is.read();
                bytesUploaded += toSubmit.length;
                if (listener != null) {
                    listener.onProgress(localJar, uploadLocation, bytesUploaded, totalSize);
                }

                if(toSubmit.length==0) break;
                client.getClient().uploadChunk(uploadLocation, ByteBuffer.wrap(toSubmit));
            }
            client.getClient().finishFileUpload(uploadLocation);

            if (listener != null) {
                listener.onCompleted(localJar, uploadLocation, totalSize);
            }

            LOG.info("Successfully uploaded topology jar to assigned location: " + uploadLocation);
            return uploadLocation;
        } catch(Exception e) {
            throw new RuntimeException(e);            
        } finally {
            client.close();
        }
    }

    /**
     * Interface use to track progress of file upload
     */
    public interface ProgressListener {
        /**
         * called before file is uploaded
         * @param srcFile - jar file to be uploaded
         * @param targetFile - destination file
         * @param totalBytes - total number of bytes of the file
         */
        public void onStart(String srcFile, String targetFile, long totalBytes);

        /**
         * called whenever a chunk of bytes is uploaded
         * @param srcFile - jar file to be uploaded
         * @param targetFile - destination file
         * @param bytesUploaded - number of bytes transferred so far
         * @param totalBytes - total number of bytes of the file
         */
        public void onProgress(String srcFile, String targetFile, long bytesUploaded, long totalBytes);

        /**
         * called when the file is uploaded
         * @param srcFile - jar file to be uploaded
         * @param targetFile - destination file
         * @param totalBytes - total number of bytes of the file
         */
        public void onCompleted(String srcFile, String targetFile, long totalBytes);
    }
}