/*
 * 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.catalina.tribes.test.transport;

import java.io.InputStream;
import java.math.BigDecimal;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.DecimalFormat;

public class SocketValidateReceive {
    static long start = 0;
    static double mb = 0;
    static byte[] buf = new byte[8192 * 4];
    static boolean first = true;
    static int count = 0;
    static DecimalFormat df = new DecimalFormat("##.00");
    static BigDecimal total = new BigDecimal(0);
    static BigDecimal bytes = new BigDecimal(32871);


    public static void main(String[] args) throws Exception {
        int size = 43800;
        if (args.length > 0 ) try {size=Integer.parseInt(args[0]);}catch(Exception x){ /* Ignore */ }

        try(ServerSocket srvSocket = new ServerSocket(9999)) {
            System.out.println("Listening on 9999");
            Socket socket = srvSocket.accept();
            socket.setReceiveBufferSize(size);
            InputStream in = socket.getInputStream();
            MyDataReader reader = new MyDataReader(50000);
            Thread t = new Thread() {
                @Override
                public void run() {
                    while ( true ) {
                        try {
                            Thread.sleep(1000);
                            printStats(start, mb, count, df, total);
                        }catch ( Exception x ) { /* Ignore */ }
                    }
                }
            };
            t.setDaemon(true);
            t.start();

            while ( true ) {
                if ( first ) {
                    first = false; start = System.currentTimeMillis();
                }
                int len = in.read(buf);
                if ( len == -1 ) {
                    printStats(start, mb, count, df, total);
                    System.exit(1);
                }
                count += reader.append(buf,0,len);

                if ( bytes.intValue() != len ) {
                    bytes = new BigDecimal((double)len);
                }
                total = total.add(bytes);
                mb += ( (double) len) / 1024 / 1024;
                if ( ((count) % 10000) == 0 ) {
                    printStats(start, mb, count, df, total);
                }
            }
        }
    }

    private static void printStats(long start, double mb, int count,
            DecimalFormat df, BigDecimal total) {
        long time = System.currentTimeMillis();
        double seconds = ((double)(time-start))/1000;
        System.out.println("Throughput " + df.format(mb/seconds) +
                " MB/seconds messages " + count + ", total " + mb +
                " MB, total " + total + " bytes.");
    }

    public static class MyDataReader {
        int length = 10;
        int cur = 0;
        byte seq = 0;
        public MyDataReader(int len) {
            length = len;
        }

        public int append(byte[] b, int off, int len) throws Exception {
            int packages = 0;
            for ( int i=off; i<len; i++ ) {
                if ( cur == length ) {
                    cur = 0;
                    seq++;
                    packages++;
                }
                if ( b[i] != seq ) throw new Exception("mismatch on seq:"+seq+" and byte nr:"+cur+" count:"+count+" packages:"+packages);
                cur++;
            }
            return packages;
        }
    }
}