/**
 * License Agreement.
 *
 *  JBoss RichFaces - Ajax4jsf Component Library
 *
 * Copyright (C) 2007  Exadel, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */

package org.ajax4jsf.component;

import java.text.NumberFormat;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.UUID;

import org.mozilla.javascript.NativeArray;
import org.mozilla.javascript.ScriptableObject;



/**
 * @author Nick Belaevski
 * @since 3.3.0
 */

public class QueueSizeTest extends AbstractQueueComponentTest {

	public QueueSizeTest(String name) {
		super(name);
	}

	private static final int numberOfEvents = 250;
	
	private static abstract interface SequenceGenerator<T> {
		public abstract T next();
	}
	
	protected TestsResult simulate(int numberOfEvents, 
			SequenceGenerator<Integer> userDelayGenerator, 
			SequenceGenerator<Integer> processTimeGenerator,
			SequenceGenerator<String> requestIdGenerator) throws Exception {
		
		NumberFormat numberFormat = NumberFormat.getInstance();
		numberFormat.setGroupingUsed(false);
		numberFormat.setMinimumIntegerDigits(String.valueOf(numberOfEvents).length());
		
		renderView("/queue-size.xhtml");
	
		ParametersBuilder parametersBuilder = createAjaxParameters().eventsQueue("defaultSizeQueue");

		int time = 0;
		
		for (int i = 0; i < numberOfEvents; i++) {
			int userDelay = userDelayGenerator.next();
			int requestTime = processTimeGenerator.next();
			
			time += userDelay;
			ajax(time, numberFormat.format(i), parametersBuilder.similarityGroupingId(requestIdGenerator.next()).
					requestTime(requestTime));
		
		}

		TestsResult result = getTestsResult();
		return result;
	}
	
	protected void checkQueueOrdering(TestsResult result) throws Exception {
		double time = 0;
		String lastRequestId = "";
		
		List<RequestData> dataList = result.getDataList();
		Iterator<RequestData> itr = dataList.iterator();
		while (itr.hasNext()) {
			RequestData data = itr.next();

			assertTrue(data.getStartTime() >= time);
			assertTrue(data.getEndTime() >= data.getStartTime());
			assertTrue(data.getData().compareTo(lastRequestId) > 0);
			
			lastRequestId = data.getData();
			time = data.getEndTime();
		}
	}
	
	private static final class UUIDGenerator implements SequenceGenerator<String> {

		public String next() {
			return UUID.randomUUID().toString();
		}
		
	}
	
	private static final class RandomSequenceGenerator implements SequenceGenerator<Integer> {

		private int offset;
		
		private int limit;
		
		public RandomSequenceGenerator(int minimum, int maximum) {
			super();
			
			this.limit = maximum - minimum;
			this.offset = minimum;
		}

		private Random random = new Random();
		
		public Integer next() {
			return random.nextInt(this.limit) + this.offset;
		}
		
	}
	
	public void testUnlimitedOverload() throws Exception {
		TestsResult result = simulate(numberOfEvents, 
			new RandomSequenceGenerator(5, 100), 
			new RandomSequenceGenerator(50, 300),
			new UUIDGenerator()
		);
		
		checkQueueOrdering(result);
		assertEquals(numberOfEvents, result.getDataList().size());
	}
	
	public void testUnlimitedUnderload() throws Exception {
		TestsResult result = simulate(numberOfEvents, 
			new RandomSequenceGenerator(50, 300),
			new RandomSequenceGenerator(5, 100), 
			new UUIDGenerator()
		);

		checkQueueOrdering(result);
		assertEquals(numberOfEvents, result.getDataList().size());
	}

	private static final class TableRequestIdGenerator implements SequenceGenerator<String> {
		private static final String[] requestIds = new String[] {
			"aaa", "bbb", "ccc", "ddd", "eee", "fff"	
		};

		private Random random = new Random();
		
		private String lastValue;
		
		private int uniqueIdsCounter = 0;
		
		public String next() {
			String newValue = requestIds[random.nextInt(requestIds.length)];
		
			if (!newValue.equals(lastValue)) {
				lastValue = newValue;
				uniqueIdsCounter++;
			}

			return newValue;
		}
		
		public int getUniqueIdsCounter() {
			return uniqueIdsCounter;
		}
	};

	
	public void testUnlimitedEmulateUser() throws Exception {
		TableRequestIdGenerator requestIdGenerator = new TableRequestIdGenerator();
		
		TestsResult result = simulate(numberOfEvents, 
			new RandomSequenceGenerator(5, 100),
			new RandomSequenceGenerator(5, 100), 
			requestIdGenerator
		);

		checkQueueOrdering(result);
		assertTrue(requestIdGenerator.getUniqueIdsCounter() <= result.getDataList().size());
		assertTrue(result.getDataList().size() <= numberOfEvents);
	}
	
	protected TestsResult checkQueue(String queueName) throws Exception {
		renderView("/queue-size.xhtml");
		
		ParametersBuilder parametersBuilder = createAjaxParameters().eventsQueue(queueName).
			requestDelay(300).requestTime(300);
		
		ajax(0, "a", parametersBuilder.similarityGroupingId("a"));
		ajax(100, "b", parametersBuilder.similarityGroupingId("b"));
		ajax(200, "c", parametersBuilder.similarityGroupingId("c"));
		ajax(300, "d", parametersBuilder.similarityGroupingId("d"));
		ajax(500, "e", parametersBuilder.similarityGroupingId("e"));
		ajax(600, "f", parametersBuilder.similarityGroupingId("f"));
		
		TestsResult result = getTestsResult();
		return result;
	}
	
	protected TestsResult checkSingleQueue(String queueName) throws Exception {
		renderView("/queue-size.xhtml");
		
		ParametersBuilder parametersBuilder = createAjaxParameters().eventsQueue(queueName).
			requestTime(300).requestDelay(200);

		ajax(0, "a", parametersBuilder.similarityGroupingId("a"));
		ajax(100, "b", parametersBuilder.similarityGroupingId("b"));
		ajax(400, "c", parametersBuilder.similarityGroupingId("c"));
		ajax(500, "d", parametersBuilder.similarityGroupingId("d"));
		ajax(700, "e", parametersBuilder.similarityGroupingId("e"));
		
		ajax(9800, "f", parametersBuilder.similarityGroupingId("f").requestTime(1000));
		ajax(10100, "g", parametersBuilder.similarityGroupingId("f").requestTime(1500));
		
		TestsResult result = getTestsResult();
		return result;
	}
	
	public void testDropNext() throws Exception {
		TestsResult result = checkQueue("dropNextQueue");
		List<RequestData> dataList = result.getDataList();
		
		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
		
		assertEquals(4, dataList.size());

		checkRequestData(dataList.get(0), "a", 100, 400, false);
		checkRequestData(dataList.get(1), "c", 400, 700, false);
		checkRequestData(dataList.get(2), "e", 700, 1000, false);
		checkRequestData(dataList.get(3), "f", 1000, 1300, false);
	}
	
	public void testDropNew() throws Exception {
		TestsResult result = checkQueue("dropNewQueue");
		List<RequestData> dataList = result.getDataList();

		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
		
		assertEquals(4, dataList.size());

		checkRequestData(dataList.get(0), "a", 100, 400, false);
		checkRequestData(dataList.get(1), "b", 400, 700, false);
		checkRequestData(dataList.get(2), "c", 700, 1000, false);
		checkRequestData(dataList.get(3), "e", 1000, 1300, false);
	}

	public void testFireNext() throws Exception {
		TestsResult result = checkQueue("fireNextQueue");
		List<RequestData> dataList = result.getDataList();

		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
	
		assertEquals(6, dataList.size());

		checkRequestData(dataList.get(0), "a", 100, 400, false);
		checkRequestData(dataList.get(1), "b", 300, 600, false);
		checkRequestData(dataList.get(2), "c", 400, 700, false);
		checkRequestData(dataList.get(3), "d", 600, 900, false);
		checkRequestData(dataList.get(4), "e", 700, 1000, false);
		checkRequestData(dataList.get(5), "f", 1000, 1300, false);
	}
	
	public void testFireNew() throws Exception {
		TestsResult result = checkQueue("fireNewQueue");
		List<RequestData> dataList = result.getDataList();

		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
	
		assertEquals(6, dataList.size());

		checkRequestData(dataList.get(0), "a", 100, 400, false);
		checkRequestData(dataList.get(1), "d", 300, 600, false);
		checkRequestData(dataList.get(2), "b", 400, 700, false);
		checkRequestData(dataList.get(3), "f", 600, 900, false);
		checkRequestData(dataList.get(4), "c", 700, 1000, false);
		checkRequestData(dataList.get(5), "e", 1000, 1300, false);
	}
	
	public void testDropNextSingle() throws Exception {
		TestsResult result = checkSingleQueue("dropNextQueueSingle");
		List<RequestData> dataList = result.getDataList();
		
		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
		
		assertEquals(3, dataList.size());

		checkRequestData(dataList.get(0), "b", 300, 600, false);
		checkRequestData(dataList.get(1), "e", 900, 1200, false);
		checkRequestData(dataList.get(2), "f", 10000, 11000, false);
	}
	
	public void testDropNewSingle() throws Exception {
		TestsResult result = checkSingleQueue("dropNewQueueSingle");
		List<RequestData> dataList = result.getDataList();
		
		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
		
		assertEquals(3, dataList.size());

		checkRequestData(dataList.get(0), "a", 100, 400, false);
		checkRequestData(dataList.get(1), "d", 700, 1000, false);
		checkRequestData(dataList.get(2), "f", 10000, 11000, false);
	}
	
	public void testFireNextSingle() throws Exception {
		TestsResult result = checkSingleQueue("fireNextQueueSingle");
		List<RequestData> dataList = result.getDataList();
		
		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
		
		assertEquals(7, dataList.size());

		checkRequestData(dataList.get(0), "a", 100, 400, false);
		checkRequestData(dataList.get(1), "b", 300, 600, false);
		checkRequestData(dataList.get(2), "c", 400, 700, false);
		checkRequestData(dataList.get(3), "d", 500, 800, false);
		checkRequestData(dataList.get(4), "e", 900, 1200, false);

		checkRequestData(dataList.get(5), "f", 10000, 11000, false);
		checkRequestData(dataList.get(6), "g", 10100, 11600, false);
	}
	
	public void testFireNewSingle() throws Exception {
		TestsResult result = checkSingleQueue("fireNewQueueSingle");
		List<RequestData> dataList = result.getDataList();
		
		for (RequestData requestData : dataList) {
			System.out.println("  " + requestData);
		}
		System.out.println();
		
		assertEquals(7, dataList.size());

		checkRequestData(dataList.get(0), "b", 100, 400, false);
		checkRequestData(dataList.get(1), "a", 100, 400, false);
		checkRequestData(dataList.get(2), "c", 400, 700, false);
		checkRequestData(dataList.get(3), "e", 700, 1000, false);
		checkRequestData(dataList.get(4), "d", 700, 1000, false);

		checkRequestData(dataList.get(5), "f", 10000, 11000, false);
		checkRequestData(dataList.get(6), "g", 10100, 11600, false);
	}
	
	public void testOnSizeExceeded() throws Exception {
		renderView("/queue-size.xhtml");
	
		for (int i = 0; i <= 3; i++) {
			clickOnTime(i, "form:button" + i);
		}
		
		TestsResult result = getTestsResult();
		List<RequestData> dataList = result.getDataList();
		
		assertEquals(2, dataList.size());
		
		//dropNext is default
		checkRequestData(dataList.get(0), "form:button0", 0, DEFAULT_REQUEST_TIME, false);
		checkRequestData(dataList.get(1), "form:button3", DEFAULT_REQUEST_TIME, DEFAULT_REQUEST_TIME * 2, false);
	
		NativeArray handlersData = (NativeArray) executeJavaScript("defaultExceededQueueResults");
		assertEquals(2, handlersData.getLength());
		
		ScriptableObject firstHandlerData = (ScriptableObject) handlersData.get(0, handlersData);
		Double firstEventTime = (Double) firstHandlerData.get("_time", firstHandlerData);
		assertEquals(2d, firstEventTime);
		
		ScriptableObject secondHandlerData = (ScriptableObject) handlersData.get(1, handlersData);
		Double secondEventTime = (Double) secondHandlerData.get("_time", secondHandlerData);
		assertEquals(3d, secondEventTime);
	}
}
