/* Copyright (C) 2013
 * swift Project Community / Contributors
 *
 * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 */

//! \cond PRIVATE_TESTS

/*!
 * \file
 * \ingroup testblackmisc
 */

#include "blackmisc/stringutils.h"
#include "test.h"

#include <QTest>
#include <QTime>

using namespace BlackMisc;

namespace BlackMiscTest
{
    //! Testing string utilities
    class CTestStringUtils : public QObject
    {
        Q_OBJECT

    private slots:
        void testRemove();
        void testContains();
        void testIndexOf();
        void testSplit();
        void testTimestampParsing();
    };

    void CTestStringUtils::testRemove()
    {
        QString s = "loUwP PeERr69";
        QVERIFY2(removeChars(s, [](QChar c) { return !c.isUpper(); }) == "UPPER", "Test removing characters by predicate");
    }

    void CTestStringUtils::testContains()
    {
        QString s = "string with a numb3r";
        QVERIFY2(containsChar(s, [](QChar c) { return c.isNumber(); }), "Test contains character by predicate");
        s = "string without a number";
        QVERIFY2(!containsChar(s, [](QChar c) { return c.isNumber(); }), "Test not contains character by predicate");
    }

    void CTestStringUtils::testIndexOf()
    {
        QString s = "string with a numb3r";
        QVERIFY2(indexOfChar(s, [](QChar c) { return c.isNumber(); }) == 18, "Test index of character by predicate");
        s = "string without a number";
        QVERIFY2(indexOfChar(s, [](QChar c) { return c.isNumber(); }) == -1, "Test not index of character by predicate");
    }

    void CTestStringUtils::testSplit()
    {
        const QString s = "line one\nline two\r\nline three\n";
        QStringList lines = splitLines(s);
        QVERIFY2(lines.size() == 3, "Test split string into lines: correct number of lines");
        QVERIFY2(lines[0] == "line one", "Test split string into lines: correct first line");
        QVERIFY2(lines[1] == "line two", "Test split string into lines: correct second line");
        QVERIFY2(lines[2] == "line three", "Test split string into lines: correct third line");
    }

    void CTestStringUtils::testTimestampParsing()
    {
        const QStringList dts(
        {
            "2018-01-01 11:11:11",
            "2012-05-09 03:04:05.777",
            "2012-05-09 00:00:00.000",
            "2015-12-31 03:04:05",
            "1999-12-31 23:59:59.999",
            "1975-01-01 14:13:17",
            "1982-05-09 03:01:05.123",
            "2000-05-02 00:04:00.000",
            "2002-12-31 03:34:33",
            "1992-11-01 21:59:29.999"
        });

        const int size = QString("yyyyMMddHHmmss").size();
        for (const QString &dt : dts)
        {
            const QString c = removeDateTimeSeparators(dt);
            const QDateTime dt1 = parseDateTimeStringOptimized(c);
            const QDateTime dt2 = (c.length() == size) ?
                                  fromStringUtc(c, "yyyyMMddHHmmss") :
                                  fromStringUtc(c, "yyyyMMddHHmmsszzz");
            QDateTime dt3 = (c.length() == size) ?
                            QDateTime::fromString(c, "yyyyMMddHHmmss") :
                            QDateTime::fromString(c, "yyyyMMddHHmmsszzz");
            dt3.setOffsetFromUtc(0);

            const qint64 ms1 = dt1.toMSecsSinceEpoch();
            const qint64 ms2 = dt2.toMSecsSinceEpoch();
            const qint64 delta = ms1 - ms2;

            QVERIFY2(dt1 == dt2, "Expect same results of QDateTime");
            QVERIFY2(dt1 == dt3, "Expect same results of QDateTime");
            QVERIFY2(delta == 0, "Expect same results timestamp");
        }

        // performance
        int constexpr Loops = 10000;
        QTime time;
        time.start();
        for (int i = 0; i < Loops; i++)
        {
            for (const QString &dt : dts)
            {
                const QString c = removeDateTimeSeparators(dt);
                const QDateTime dateTime = parseDateTimeStringOptimized(c);
                parseDateTimeStringOptimized(c);
                Q_UNUSED(dateTime); // avoid optimizing out of call
            }
        }
        const int elapsedOptimized = time.restart();

        for (int i = 0; i < Loops; i++)
        {
            for (const QString &dt : dts)
            {
                const QString c = removeDateTimeSeparators(dt);
                const QDateTime dateTime = (c.length() == size) ?
                                           fromStringUtc(c, "yyyyMMddHHmmss") :
                                           fromStringUtc(c, "yyyyMMddHHmmsszzz");
                Q_UNUSED(dateTime); // avoid optimizing out of call
            }
        }
        const int elapsedQt = time.restart();

        qDebug() << "Parsing date/time, optimized" << elapsedOptimized << "vs. QDateTime: " << elapsedQt;
        QVERIFY2(elapsedOptimized < elapsedQt, "Expect optimized being faster as QDateTim::fromString");
    }
}

//! main
BLACKTEST_APPLESS_MAIN(BlackMiscTest::CTestStringUtils);

#include "teststringutils.moc"

//! \endcond