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/**
 *  BlueCove - Java library for Bluetooth
 *  Copyright (C) 2006-2007 Vlad Skarzhevskyy
 * 
 *  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.
 *
 *  @author vlads
 *  @version $Id$
 */
package net.sf.bluecove.tests;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.bluecove.tester.log.Logger;
import org.bluecove.tester.util.TimeUtils;

import junit.framework.Assert;

import net.sf.bluecove.CommunicationData;
import net.sf.bluecove.ConnectionHolderStream;

/**
 * Test two directional Stream. Create Second Thread to Write to connection.
 * Main Test thread will read data sent by connected party. Test is symmetrical
 * in regards to client and server.
 * 
 */
public class TwoThreadsPerConnection {

	private static final int DATA_SIZE = 8 * 1024;

	private int arraySize;

	private boolean synchronize;

	private int iterations;

	private int bytesTotal;

	private int sentCount = 0;

	private int receivedCount = 0;

	private boolean stoped = false;

	private class WriteTread extends Thread {

		ConnectionHolderStream c;

		boolean isRunning;

		boolean sendFinishedSuccessfully = false;

		public void run() {
			try {
				isRunning = true;
				sendingData(c.os, c);
				sendFinishedSuccessfully = true;
			} catch (IOException e) {
				Logger.error("Sending", e);
			} finally {
				isRunning = false;
			}
		}

	}

	WriteTread startSender(ConnectionHolderStream c) {
		WriteTread t = new WriteTread();
		t.c = c;
		t.start();
		return t;
	}

	void equalizeWrite() {
		while ((!stoped) && (sentCount - receivedCount > 256)) {
			try {
				Thread.sleep(50);
			} catch (InterruptedException e) {
				Assert.fail("interrupted");
			}
		}
	}

	void sendingData(OutputStream os, ConnectionHolderStream c) throws IOException {
		long start = System.currentTimeMillis();
		long reported = start;
		int k = 0;
		for (int i = 1; (!stoped) && i <= iterations; i++) {
			if (arraySize == 1) {
				os.write((byte) i);
				if (i % 64 == 0) {
					os.flush();
				}
			} else {
				byte[] data = new byte[arraySize];
				for (int j = 0; j < arraySize; j++, k++) {
					data[j] = (byte) k;
				}
				os.write(data);
				if (i % 2 == 0) {
					os.flush();
				}
			}
			sentCount += arraySize;
			if ((i % 100 == 0) && (TimeUtils.since(reported) > 10000)) {
				Logger.debug("sent " + sentCount + "; received " + receivedCount + " bytes in "
						+ TimeUtils.secSince(start));
				reported = System.currentTimeMillis();
			}
			if (synchronize) {
				equalizeWrite();
			}
			c.active();
		}
		if (!stoped) {
			Logger.debug("speed " + TimeUtils.bps(sentCount, start));
		}
	}

	void readingData(InputStream is, ConnectionHolderStream c) throws IOException {
		int k = 0;
		for (int i = 1; i <= iterations; i++) {
			try {
				if (arraySize == 1) {
					byte got = (byte) is.read();
					Assert.assertEquals("sent " + sentCount + " bytes; read byte[" + i + "]", (byte) i, got);
					receivedCount++;
				} else {
					byte[] data = new byte[arraySize];
					int len = arraySize;
					int read_off = 0;
					while (len != 0) {
						int rcvd = is.read(data, read_off, len);
						if (rcvd == -1) {
							throw new IOException("EOF not expected");
						}
						len -= rcvd;
						read_off += rcvd;
					}
					for (int j = 0; j < arraySize; j++, k++) {
						Assert.assertEquals("sent " + sentCount + " bytes; read byte[" + k + "]", (byte) k, data[j]);
					}
					c.active();
					receivedCount += arraySize;
				}
			} catch (IOException e) {
				Logger.debug("Received only " + receivedCount + " bytes");
				throw e;
			}
			c.active();
		}
	}

	public static void start(ConnectionHolderStream c, int arraySize, boolean synchronize) throws IOException {
		TwoThreadsPerConnection worker = new TwoThreadsPerConnection();
		worker.synchronize = synchronize;
		worker.arraySize = arraySize;
		if (arraySize == 1) {
			worker.bytesTotal = DATA_SIZE;
			worker.iterations = worker.bytesTotal;
		} else {
			worker.iterations = DATA_SIZE / arraySize;
			worker.bytesTotal = worker.iterations * arraySize;
		}

		WriteTread sender = worker.startSender(c);
		try {
			worker.readingData(c.is, c);
			try {
				if (sender.isRunning) {
					sender.join();
				}
			} catch (InterruptedException e) {
				Assert.fail("interrupted");
			}
		} finally {
			worker.stoped = true;
		}
		Assert.assertEquals("sentCount", worker.bytesTotal, worker.sentCount);
		Assert.assertTrue("sendFinishedSuccessfully", sender.sendFinishedSuccessfully);
		c.os.write(CommunicationData.aKnowndPositiveByte);
		Assert.assertEquals("end conformation", CommunicationData.aKnowndPositiveByte, c.is.read());

	}
}