#include <QtTest>
#include <QSpinBox>
#include <QPushButton>
#include <QLabel>
#include <QCheckBox>
#include "countdown.h"
#include "mainwindow.h"
#include <QApplication>
#include <QDir>
#include "appearance.h"

static void savePreview(QWidget &window, const QString &fileName)
{
    const QString folder = QString::fromLocal8Bit(qgetenv("QT_TEACHING_SCREENSHOTS"));
    if (folder.isEmpty()) return;
    QDir().mkpath(folder);
    window.show();
    QApplication::processEvents();
    QVERIFY(window.grab().save(QDir(folder).filePath(fileName)));
}

class TimerTest : public QObject {
    Q_OBJECT
private slots:
    void initTestCase() { applyAppearance(*qApp); }
    void pauseResumeAndDrift()
    {
        Countdown model(10000);
        model.start(100);
        model.start(500); // 重复开始不能重新计时。
        QCOMPARE(model.remaining(2600), qint64(7500));
        model.pause(2600);
        QCOMPARE(model.remaining(90000), qint64(7500));
        QVERIFY(!model.setDuration(2000));
        model.start(100000);
        QCOMPARE(model.remaining(102500), qint64(5000));
        model.update(107500);
        QVERIFY(model.state() == Countdown::State::Finished);
        QCOMPARE(model.remaining(107500), qint64(0));
        model.start(200000);
        QCOMPARE(model.remaining(200000), qint64(10000));
    }
    void delayedRefreshAndReset()
    {
        Countdown model(5000);
        model.start(0);
        model.update(100);
        model.update(4300);
        QCOMPARE(model.remaining(4300), qint64(700));
        model.update(9999);
        QCOMPARE(model.remaining(9999), qint64(0));
        QVERIFY(model.state() == Countdown::State::Finished);
        model.reset();
        QVERIFY(model.state() == Countdown::State::Ready);
        QCOMPARE(model.remaining(9999), qint64(5000));
    }
    void zeroAndDeadlinePause()
    {
        Countdown model(0);
        model.start(0);
        QVERIFY(model.state() == Countdown::State::Ready);
        QVERIFY(!model.setDuration(-1));
        QVERIFY(model.setDuration(1000));
        model.start(10);
        model.pause(1010);
        QVERIFY(model.state() == Countdown::State::Finished);
    }
    void uiWorkflow()
    {
        MainWindow w; w.show();
        auto *start = w.findChild<QPushButton *>(QStringLiteral("startButton"));
        auto *pause = w.findChild<QPushButton *>(QStringLiteral("pauseButton"));
        auto *reset = w.findChild<QPushButton *>(QStringLiteral("resetButton"));
        auto *minutes = w.findChild<QSpinBox *>(QStringLiteral("minutesSpin"));
        auto *seconds = w.findChild<QSpinBox *>(QStringLiteral("secondsSpin"));
        auto *time = w.findChild<QLabel *>(QStringLiteral("timeLabel"));
        w.findChild<QCheckBox *>(QStringLiteral("soundCheck"))->setChecked(false);
        savePreview(w, QStringLiteral("02_timer.png"));
        minutes->setValue(0); seconds->setValue(1);
        QTest::mouseClick(start, Qt::LeftButton);
        QVERIFY(!minutes->isEnabled());
        QTest::mouseClick(pause, Qt::LeftButton);
        QCOMPARE(start->text(), QStringLiteral("继续"));
        const QString pausedText = time->text();
        QTest::qWait(150);
        QCOMPARE(time->text(), pausedText);
        QTest::mouseClick(start, Qt::LeftButton);
        QTRY_COMPARE(time->text(), QStringLiteral("00:00:00"));
        QVERIFY(w.findChild<QLabel *>(QStringLiteral("statusLabel"))->text().contains(QStringLiteral("时间到")));
        QVERIFY(!pause->isEnabled());
        QTest::mouseClick(reset, Qt::LeftButton);
        QCOMPARE(time->text(), QStringLiteral("00:00:01"));
        QVERIFY(minutes->isEnabled());
        seconds->setValue(0);
        QVERIFY(!start->isEnabled());
    }
};
QTEST_MAIN(TimerTest)
#include "test_ClassroomTimer.moc"