/*
    * 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 org.apache.hadoop.chukwa.extraction.demux;
  
  
  import java.io.IOException;
  import java.net.URI;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Calendar;
  import java.util.List;
  import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
  import org.apache.hadoop.chukwa.util.DaemonWatcher;
  import org.apache.hadoop.chukwa.util.ExceptionUtil;
  import org.apache.hadoop.conf.Configured;
  import org.apache.hadoop.fs.FileStatus;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.FileUtil;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.mapred.FileInputFormat;
  import org.apache.hadoop.mapred.FileOutputFormat;
  import org.apache.hadoop.mapred.JobClient;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.JobPriority;
  import org.apache.hadoop.mapred.SequenceFileInputFormat;
  import org.apache.hadoop.mapred.SequenceFileOutputFormat;
  import org.apache.hadoop.mapred.lib.IdentityMapper;
  import org.apache.hadoop.mapred.lib.IdentityReducer;
  import org.apache.hadoop.util.Tool;
  import org.apache.log4j.Logger;
  
  // TODO do an abstract class for all rolling 
  public class DailyChukwaRecordRolling extends Configured implements Tool {
    static Logger log = Logger.getLogger(DailyChukwaRecordRolling.class);
  
    static SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyyMMdd");
    static ChukwaConfiguration conf = null;
    static FileSystem fs = null;
    static final String HadoopLogDir = "_logs";
    static final String hadoopTempDir = "_temporary";
  
    static boolean rollInSequence = true;
    static boolean deleteRawdata = false;
  
    public static void usage() {
      System.err
          .println("usage: java org.apache.hadoop.chukwa.extraction.demux.DailyChukwaRecordRolling rollInSequence <True/False> deleteRawdata <True/False>");
      System.exit(-1);
    }
  
    public static boolean hourlyRolling(String dailyStreamDirectory) {
     
      Path pHour = null;
      try {
        log.info("Checking for HourlyRolling in " + dailyStreamDirectory);
        
        for (int i=0;i<24;i++) {
          pHour = new Path(dailyStreamDirectory + "/" + i);
          if (! fs.exists(pHour)) {
            log.info("HourlyData is missing for:" + pHour);
            continue;
          } else {
            FileStatus[] files = fs.listStatus(pHour);
            boolean containsHourly = false;
            for(FileStatus file: files) {
              log.info("Debug checking" + file.getPath());
              if (file.getPath().getName().indexOf("_HourlyDone_") > 0) {
                containsHourly = true;
                break;
              }
            }
            if (containsHourly == false) {
              log.info("HourlyDone is missing for : " + pHour);
              return false;
            }
          }
        }
        return true;
      }catch(Exception e) {
        e.printStackTrace();
        return false;
     }
   }
   public static void buildDailyFiles(String chukwaMainRepository,
       String tempDir, String rollingFolder, int workingDay) throws IOException {
     // process
     
     boolean alldone = true;
     
     Path dayPath = new Path(rollingFolder + "/daily/" + workingDay);
     FileStatus[] clustersFS = fs.listStatus(dayPath);
     for (FileStatus clusterFs : clustersFS) {
       String cluster = clusterFs.getPath().getName();
 
       Path dataSourceClusterHourPaths = new Path(rollingFolder + "/daily/"
           + workingDay + "/" + cluster);
       FileStatus[] dataSourcesFS = fs.listStatus(dataSourceClusterHourPaths);
       for (FileStatus dataSourceFS : dataSourcesFS) {
         String dataSource = dataSourceFS.getPath().getName();
         // Repo path = reposRootDirectory/<cluster>/<day>/*/*.evt
 
 
         // put the rotate flag
         fs.mkdirs(new Path(chukwaMainRepository + "/" + cluster + "/"
             + dataSource + "/" + workingDay + "/rotateDone"));
         
         if (hourlyRolling(chukwaMainRepository + "/" + cluster + "/" + dataSource + "/" + workingDay) == false) {
           log.warn("Skipping this directory, hourly not done. " + chukwaMainRepository + "/" + cluster + "/"
             + dataSource + "/" + workingDay );
           alldone = false;
           continue;
         } 
         
         log.info("Running Daily rolling for " + chukwaMainRepository + "/" + cluster + "/"
             + dataSource + "/" + workingDay + "/rotateDone");
         
         // rotate
         // Merge
         String[] mergeArgs = new String[5];
         // input
         mergeArgs[0] = chukwaMainRepository + "/" + cluster + "/" + dataSource
             + "/" + workingDay + "/[0-9]*/*.evt";
         // temp dir
         mergeArgs[1] = tempDir + "/" + cluster + "/" + dataSource + "/"
             + workingDay + "_" + System.currentTimeMillis();
         // final output dir
         mergeArgs[2] = chukwaMainRepository + "/" + cluster + "/" + dataSource
             + "/" + workingDay;
         // final output fileName
         mergeArgs[3] = dataSource + "_DailyDone_"  + workingDay;
         // delete rolling directory
         mergeArgs[4] = rollingFolder + "/daily/" + workingDay + "/" + cluster
             + "/" + dataSource;
 
         log.info("DailyChukwaRecordRolling 0: " + mergeArgs[0]);
         log.info("DailyChukwaRecordRolling 1: " + mergeArgs[1]);
         log.info("DailyChukwaRecordRolling 2: " + mergeArgs[2]);
         log.info("DailyChukwaRecordRolling 3: " + mergeArgs[3]);
         log.info("DailyChukwaRecordRolling 4: " + mergeArgs[4]);
 
         RecordMerger merge = new RecordMerger(conf, fs,
             new DailyChukwaRecordRolling(), mergeArgs, deleteRawdata);
         List<RecordMerger> allMerge = new ArrayList<RecordMerger>();
         if (rollInSequence) {
           merge.run();
         } else {
           allMerge.add(merge);
           merge.start();
         }
 
         // join all Threads
         if (!rollInSequence) {
           while (allMerge.size() > 0) {
             RecordMerger m = allMerge.remove(0);
             try {
               m.join();
             } catch (InterruptedException e) {
             }
           }
         } // End if (!rollInSequence)
 
         // Delete the processed dataSourceFS
           FileUtil.fullyDelete(fs, dataSourceFS.getPath());
 
       } // End for(FileStatus dataSourceFS : dataSourcesFS)
 
       // Delete the processed clusterFs
       if (alldone == true) {
         FileUtil.fullyDelete(fs, clusterFs.getPath());
       }
       
 
     } // End for(FileStatus clusterFs : clustersFS)
 
     // Delete the processed dayPath
     if (alldone == true) {
       FileUtil.fullyDelete(fs, dayPath);
     }
     
   }
 
   /**
    * @param args
    * @throws Exception
    */
   public static void main(String[] args) throws Exception {
     
     DaemonWatcher.createInstance("DailyChukwaRecordRolling");
     
     conf = new ChukwaConfiguration();
     String fsName = conf.get("writer.hdfs.filesystem");
     fs = FileSystem.get(new URI(fsName), conf);
 
     // TODO read from config
     String rollingFolder = "/chukwa/rolling/";
     String chukwaMainRepository = "/chukwa/repos/";
     String tempDir = "/chukwa/temp/dailyRolling/";
 
     // TODO do a real parameter parsing
     if (args.length != 4) {
       usage();
     }
 
     if (!args[0].equalsIgnoreCase("rollInSequence")) {
       usage();
     }
 
     if (!args[2].equalsIgnoreCase("deleteRawdata")) {
       usage();
     }
 
     if (args[1].equalsIgnoreCase("true")) {
       rollInSequence = true;
     } else {
       rollInSequence = false;
     }
 
     if (args[3].equalsIgnoreCase("true")) {
       deleteRawdata = true;
     } else {
       deleteRawdata = false;
     }
 
     log.info("rollInSequence: " + rollInSequence);
     log.info("deleteRawdata: " + deleteRawdata);
 
     Calendar calendar = Calendar.getInstance();
     int currentDay = Integer.parseInt(sdf.format(calendar.getTime()));
     int currentHour = calendar.get(Calendar.HOUR_OF_DAY);
     log.info("CurrentDay: " + currentDay);
     log.info("currentHour" + currentHour);
 
     Path rootFolder = new Path(rollingFolder + "/daily/");
 
     FileStatus[] daysFS = fs.listStatus(rootFolder);
     for (FileStatus dayFS : daysFS) {
       try {
         int workingDay = Integer.parseInt(dayFS.getPath().getName());
         log.info("Daily working on :" + workingDay);
         if (workingDay < currentDay) {
           
           try {
             buildDailyFiles(chukwaMainRepository, tempDir, rollingFolder,
                 workingDay);
           } catch(Throwable e) {
             e.printStackTrace();
             log.warn("Daily rolling failed on :" + rollingFolder +"/" + workingDay  ) ;
           }
           
         } // End if ( workingDay < currentDay)
       } // End Try workingDay =
         // Integer.parseInt(sdf.format(dayFS.getPath().getName()));
       catch (NumberFormatException e) { /* Not a standard Day directory skip */
         log.debug(ExceptionUtil.getStackTrace(e));
       }
 
     } // for(FileStatus dayFS : daysFS)
   }
 
   public int run(String[] args) throws Exception {
     JobConf conf = new JobConf(new ChukwaConfiguration(), DailyChukwaRecordRolling.class);
 
     conf.setJobName("DailyChukwa-Rolling");
     conf.setInputFormat(SequenceFileInputFormat.class);
 
     conf.setMapperClass(IdentityMapper.class);
     conf.setReducerClass(IdentityReducer.class);
 
     conf.setOutputKeyClass(ChukwaRecordKey.class);
     conf.setOutputValueClass(ChukwaRecord.class);
     conf.setOutputFormat(SequenceFileOutputFormat.class);
 
     log.info("DailyChukwaRecordRolling input: " + args[0]);
     log.info("DailyChukwaRecordRolling output: " + args[1]);
 
     FileInputFormat.setInputPaths(conf, args[0]);
     FileOutputFormat.setOutputPath(conf, new Path(args[1]));
     conf.setJobPriority(JobPriority.LOW);
     conf.setNumReduceTasks(1);
     JobClient.runJob(conf);
     return 0;
   }
 
 }