/*
 * Created on May 19, 2005
 * Created by Alon Rohter
 * Copyright (C) 2005, 2006 Aelitis, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 * 
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */

package com.aelitis.azureus.core.networkmanager.impl;

import java.util.*;

import org.gudy.azureus2.core3.util.Timer;
import org.gudy.azureus2.core3.util.TimerEvent;
import org.gudy.azureus2.core3.util.TimerEventPerformer;

public class TransportStats {

  private static final int PRINT_INTERVAL = 60*1000;
  private static final int GRANULARITY = 10;  //bytes
  
  private final TreeMap read_sizes = new TreeMap();
  private final TreeMap write_sizes = new TreeMap();
  
  private long total_reads = 0;
  private long total_writes = 0;
  
  
  public TransportStats() {
    Timer printer = new Timer("TransportStats:Printer");
    printer.addPeriodicEvent(
        PRINT_INTERVAL,
        new TimerEventPerformer() {
          public void perform( TimerEvent ev ) {
            printStats();
          }
        }
    );
  }
  
  
  public void bytesRead( int num_bytes_read ) {
    total_reads++;
    updateSizes( read_sizes, num_bytes_read );
  }
  
  
  public void bytesWritten( int num_bytes_written ) {
    total_writes++;
    updateSizes( write_sizes, num_bytes_written );
  }
  
  
  private void updateSizes( TreeMap io_sizes, int num_bytes ) {
    Integer size_key;
    
    if( num_bytes == 0 ) {
      size_key = new Integer( 0 );
    }
    else {
      size_key = new Integer( (num_bytes / GRANULARITY) +1 );
    }
      
    Long count = (Long)io_sizes.get( size_key );
    
    if( count == null ) {
      io_sizes.put( size_key, new Long( 1 ) );
    }
    else {
      io_sizes.put( size_key, new Long( count.longValue() +1 ) );
    }
  }
  
  
  private void printStats() {
    System.out.println( "\n------------------------------" );
    System.out.println( "***** TCP SOCKET READ SIZE STATS *****" );
    printSizes( read_sizes, total_reads );
    
    System.out.println( "\n***** TCP SOCKET WRITE SIZE STATS *****" );
    printSizes( write_sizes, total_writes );
    System.out.println( "------------------------------" );
  }
  
 
  
  private void printSizes( TreeMap size_map, long num_total ) {
    int prev_high = 1;
    
    for( Iterator it = size_map.entrySet().iterator(); it.hasNext(); ) {
      Map.Entry entry = (Map.Entry)it.next();
      int key = ((Integer)entry.getKey()).intValue();
      long count = ((Long)entry.getValue()).longValue();
      
      long percentage = (count *100) / num_total;
      
      if( key == 0 ) {   
        if( percentage > 3 ) {
          System.out.println( "[0 bytes]= x" +percentage+ "%" );
        }
      }
      else {
        int high = key * GRANULARITY;
        
        if( percentage > 3 ) {
          System.out.println( "[" +prev_high+ "-" +(high -1)+ " bytes]= x" +percentage+ "%" );
        }
        
        prev_high = high;
      }
    }
  }

  
}