// ============================================================================
//
// Copyright (C) 2006-2016 Talend Inc. - www.talend.com
//
// This source code is available under agreement available at
// %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt
//
// You should have received a copy of the agreement
// along with this program; if not, write to Talend SA
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package org.talend.dataquality.indicators.impl;

import java.util.Random;

import org.junit.Assert;
import org.junit.Ignore;
import org.junit.Test;
import org.talend.dataquality.common.regex.ChainResponsibilityHandler;
import org.talend.dataquality.common.regex.HandlerFactory;
import org.talend.utils.dates.DateUtils;

/**
 * created by zhao on 2015年10月15日 Detailled comment
 *
 */
public class PatternFreqIndicatorImplTest {

    private final static String LATIN_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞß0123456789"; //$NON-NLS-1$

    private final static String LATIN_CHARS_PATT = "aaaaaaaaaaaaaaaaaaaaaaaaaaAAAAAAAAAAAAAAAAAAAAAAAAAAaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA9999999999"; //$NON-NLS-1$

    @Test
    public void testLatinPatternReplacement() {
        PatternFreqIndicatorImpl matchIndicator = new PatternFreqIndicatorImpl();
        Assert.assertEquals(LATIN_CHARS_PATT, matchIndicator.getFrequencyLabel(LATIN_CHARS));
    }

    @Ignore
    @Test
    public void testLatin1PerfWithLoop() {
        // int countStart = 800000;
        // int countMax = 1000000;
        // int countStep = 500000;
        //
        // int lengthStart = 5;
        // int lengthMax = 20;
        // int lengthStep = 5;
        //
        // for (int count = countStart; count < countMax; count += countStep) {
        // for (int length = lengthStart; length <= lengthMax; length += lengthStep) {
        // testLatin1Perf(count, length);
        // }
        // }
    }

    private void testLatin1Perf(int count, int length) {
        PatternFreqIndicatorImpl matchIndicator = new PatternFreqIndicatorImpl();

        // Character replace
        Random r = new Random();
        StringBuffer bf = new StringBuffer();
        long crStart = System.currentTimeMillis();
        System.out.println("Char replacement start at: " + DateUtils.getCurrentDate(DateUtils.PATTERN_2)); //$NON-NLS-1$
        for (int i = 0; i < count; i++) {
            if (i % length == 0) {
                if (i != 0) {
                    matchIndicator.getFrequencyLabel(bf.toString());
                }
                bf = new StringBuffer();
            }
            bf.append(LATIN_CHARS.charAt(r.nextInt(LATIN_CHARS.length())));
        }
        System.out.println("End at: " + DateUtils.getCurrentDate(DateUtils.PATTERN_2)); //$NON-NLS-1$
        long crEnd = System.currentTimeMillis();

        // Regex
        ChainResponsibilityHandler createEastAsiaPatternHandler = HandlerFactory.createLatinPatternHandler();
        long reStart = System.currentTimeMillis();
        System.out.println("Regex replacement start at: " + DateUtils.getCurrentDate(DateUtils.PATTERN_2)); //$NON-NLS-1$
        for (int i = 0; i < count; i++) {
            if (i % length == 0) {
                if (i != 0) {
                    createEastAsiaPatternHandler.handleRequest(bf.toString());
                }
                bf = new StringBuffer();
            }
            bf.append(LATIN_CHARS.charAt(r.nextInt(LATIN_CHARS.length())));
        }
        System.out.println("End at: " + DateUtils.getCurrentDate(DateUtils.PATTERN_2)); //$NON-NLS-1$
        long reEnd = System.currentTimeMillis();
        // Assert that the time spend by char replacement is 3 times less than that of regex.
        Assert.assertTrue(reEnd - reStart > crEnd - crStart);
        Assert.assertTrue(reEnd - reStart < 4 * (crEnd - crStart));
    }
}