/*
    * 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.util;
  
  
  import java.io.*;
  import java.nio.charset.Charset;
  import java.util.Calendar;
  import java.util.Random;
  
  import org.apache.hadoop.chukwa.ChukwaArchiveKey;
  import org.apache.hadoop.chukwa.ChunkImpl;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FSDataOutputStream;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.SequenceFile;
  
  public class TempFileUtil {
    public static File makeBinary(int length) throws IOException {
      File tmpOutput = new File(System.getProperty("test.build.data", "/tmp"),
          "chukwaTest");
      FileOutputStream fos = null;
      try {
        fos = new FileOutputStream(tmpOutput);
        Random r = new Random();
        byte[] randomData = new byte[length];
        r.nextBytes(randomData);
        randomData[length - 1] = '\n';// need data to end with \n since default
                                    // tailer uses that
        fos.write(randomData);
        fos.flush();
      } finally {
        if(fos != null) {
          fos.close();
        }
      }
      return tmpOutput;
    }
    
  
    static class RandSeqFileWriter {
      java.util.Random r = new java.util.Random();
      long lastSeqID = 0;
      
      public ChunkImpl getARandomChunk() {
        int ms = r.nextInt(1000);
        String line = "2008-05-29 10:42:22," + ms
            + " INFO org.apache.hadoop.dfs.DataNode: Some text goes here"
            + r.nextInt() + "\n";
         
        ChunkImpl c = new ChunkImpl("HadoopLogProcessor", "test",
        line.length()  + lastSeqID, line.getBytes(Charset.forName("UTF-8")), null);
        lastSeqID += line.length();
        c.addTag("cluster=\"foocluster\"");
        return c;
      }
    }
    
    public static void writeASinkFile(Configuration conf, FileSystem fileSys, Path dest,
         int chunks) throws IOException {
       FSDataOutputStream out = fileSys.create(dest);
  
       Calendar calendar = Calendar.getInstance();
       SequenceFile.Writer seqFileWriter = SequenceFile.createWriter(conf, out,
           ChukwaArchiveKey.class, ChunkImpl.class,
           SequenceFile.CompressionType.NONE, null);
       RandSeqFileWriter rw = new RandSeqFileWriter();
       for (int i = 0; i < chunks; ++i) {
         ChunkImpl chunk = rw.getARandomChunk();
         ChukwaArchiveKey archiveKey = new ChukwaArchiveKey();
  
         calendar.set(Calendar.YEAR, 2008);
         calendar.set(Calendar.MONTH, Calendar.MAY);
         calendar.set(Calendar.DAY_OF_MONTH, 29);
         calendar.set(Calendar.HOUR, 10);
         calendar.set(Calendar.MINUTE, 0);
         calendar.set(Calendar.SECOND, 0);
         calendar.set(Calendar.MILLISECOND, 0);
         archiveKey.setTimePartition(calendar.getTimeInMillis());
         archiveKey.setDataType(chunk.getDataType());
         archiveKey.setStreamName(chunk.getStreamName());
         archiveKey.setSeqId(chunk.getSeqID());
        seqFileWriter.append(archiveKey, chunk);
      }
      seqFileWriter.close();
      out.close();
    }
    
 
    public static File makeTestFile(String name, int size,File baseDir) throws IOException {
      File tmpOutput = new File(baseDir, name);
      FileOutputStream fos = new FileOutputStream(tmpOutput);
      PrintWriter pw = new PrintWriter(new OutputStreamWriter(fos, Charset.forName("UTF-8")));
      for (int i = 0; i < size; ++i) {
        pw.print(i + " ");
        pw.println("abcdefghijklmnopqrstuvwxyz");
      }
      pw.flush();
      pw.close();
      return tmpOutput;
    }
    
 
    public static File makeTestFile(String name, int size) throws IOException {
      return makeTestFile(name, size, new File(System.getProperty("test.build.data", "/tmp")));
 
    }
    
    public static File makeTestFile(File baseDir) throws IOException {
      return makeTestFile("atemp",10, baseDir);
    }
    
 
    public static File makeTestFile() throws IOException {
      return makeTestFile("atemp",80, new File(System.getProperty("test.build.data", "/tmp")));
    }
   
 }