/*
Copyright (c) 2014 Alexander Richardson <alex.richardson@gmx.de>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include "signals_test_singleton.h"
#include "signals_test_no_singleton.h"
#include "signals_test_singleton_dpointer.h"
#include "signals_test_no_singleton_dpointer.h"
#include <QtTest/QtTestGui>
#include <QtTest/QSignalSpy>
#include <QtCore/QSharedPointer>
#include <QtCore/QtGlobal>
#include <QtCore/QDebug>
#include <QTemporaryFile>
#include <QFileInfo>
#include <functional>

class KConfigCompiler_Test_Signals : public QObject
{
    Q_OBJECT
private Q_SLOTS:
    void testSetters();
    void testSetters_data();
    void testSetProperty();
    void testSetProperty_data();
    void initTestCase();
    void cleanupTestCase();
};

static SignalsTestNoSingleton* noSingleton;
static SignalsTestNoSingletonDpointer* noSingletonDpointer;

void KConfigCompiler_Test_Signals::initTestCase()
{
    // These tests do a lot quite a few I/O operations, speed that up by using a QTemporaryFile.
    // At least on Linux this is often a tmpfs which means only RAM operations
    QTemporaryFile* tempFile1 = new QTemporaryFile(this);
    QTemporaryFile* tempFile2 = new QTemporaryFile(this);
    QTemporaryFile* tempFile3 = new QTemporaryFile(this);
    QTemporaryFile* tempFile4 = new QTemporaryFile(this);
    QVERIFY(tempFile1->open());
    QVERIFY(tempFile2->open());
    QVERIFY(tempFile3->open());
    QVERIFY(tempFile4->open());

    SignalsTestSingleton::instance(QFileInfo(*tempFile1).absoluteFilePath());
    SignalsTestSingletonDpointer::instance(QFileInfo(*tempFile2).absoluteFilePath());
    noSingleton = new SignalsTestNoSingleton(
                KSharedConfig::openConfig(QFileInfo(*tempFile3).absoluteFilePath(), KConfig::SimpleConfig));
    noSingletonDpointer = new SignalsTestNoSingletonDpointer(
                KSharedConfig::openConfig(QFileInfo(*tempFile4).absoluteFilePath(), KConfig::SimpleConfig));
}

void KConfigCompiler_Test_Signals::cleanupTestCase()
{
    //ensure these instances are deleted before the temporary files are closed
    delete noSingleton;
    delete noSingletonDpointer;
    delete SignalsTestSingleton::self();
    delete SignalsTestSingletonDpointer::self();
}

struct TestSettersArg {
    // default constructor required for Q_DECLARE_METATYPE
    TestSettersArg() : obj(Q_NULLPTR) {}
    template<typename T>
    TestSettersArg(T* object) : obj(object) {
        // we can also call static methods using object->foo() so this works for all four cases
        getter = [object]() { return object->foo(); };
        defaultGetter = [object]() { return object->defaultFooValue(); };
        setter = [object](const QString& s) { object->setFoo(s); };
    }
    KCoreConfigSkeleton* obj;
    std::function<QString()> getter;
    std::function<QString()> defaultGetter;
    std::function<void(const QString&)> setter;
};

Q_DECLARE_METATYPE(TestSettersArg) // so that QFETCH works

void KConfigCompiler_Test_Signals::testSetters_data()
{
    QTest::addColumn<TestSettersArg>("params");
    QTest::newRow("singleton") << TestSettersArg(SignalsTestSingleton::self());
    QTest::newRow("singleton dpointer") << TestSettersArg(SignalsTestSingletonDpointer::self());
    QTest::newRow("non-singleton") << TestSettersArg(noSingleton);
    QTest::newRow("non-singleton dpointer") << TestSettersArg(noSingleton);
}

/** Ensure that a signal is emitted whenever the data is changed by using the generated setters */
void KConfigCompiler_Test_Signals::testSetters()
{
    QFETCH(TestSettersArg, params);
    const char* signal = SIGNAL(fooChanged(QString));
    const QString defaultValue = QStringLiteral("default");
    const QString changedValue = QStringLiteral("changed");

    // make sure we are in the default state
    params.obj->setDefaults();
    params.obj->save();

    QList<QVariant> args;
    QSignalSpy spy(params.obj, signal);
    QVERIFY2(spy.isValid(), signal);

    //change value via setter, should get signal
    QCOMPARE(params.getter(), defaultValue);
    QCOMPARE(defaultValue, params.defaultGetter());
    QCOMPARE(params.getter(), params.defaultGetter());
    QVERIFY(changedValue != params.getter());
    params.setter(changedValue);
    QCOMPARE(params.getter(), changedValue);
    QCOMPARE(spy.count(), 0); //should have no change yet, only after save()
    params.obj->save();
    QCOMPARE(spy.count(), 1);
    args = spy.takeFirst();
    QCOMPARE(args.size(), 1);
    QCOMPARE(args[0].toString(), changedValue);

    //reset to default values via setDefaults()
    QVERIFY(params.getter() != params.defaultGetter());
    QVERIFY(params.getter() != defaultValue);
    QCOMPARE(params.getter(), changedValue);
    params.obj->setDefaults();
    QCOMPARE(params.getter(), params.defaultGetter());
    QCOMPARE(params.getter(), defaultValue);

    QCOMPARE(spy.count(), 0); //should have no change yet, only after save()
    params.obj->save();
    //TODO: This currently fails since setDefaults() does not yet cause emitting a signal
    QCOMPARE(spy.count(), 1);
    args = spy.takeFirst();
    QCOMPARE(args.size(), 1);
    QCOMPARE(args[0].value<QString>(), defaultValue);
}

Q_DECLARE_METATYPE(KCoreConfigSkeleton*)

void KConfigCompiler_Test_Signals::testSetProperty_data()
{
    QTest::addColumn<KCoreConfigSkeleton*>("obj");
    QTest::newRow("singleton") << static_cast<KCoreConfigSkeleton*>(SignalsTestSingleton::self());
    QTest::newRow("singleton dpointer") << static_cast<KCoreConfigSkeleton*>(SignalsTestSingletonDpointer::self());
    QTest::newRow("non-singleton") << static_cast<KCoreConfigSkeleton*>(noSingleton);
    QTest::newRow("non-singleton dpointer") << static_cast<KCoreConfigSkeleton*>(noSingletonDpointer);
}

/** Test that the signal is emitted when modifying the values using the underlying KConfigSkeletonItem (bypassing the setters) */
void KConfigCompiler_Test_Signals::testSetProperty()
{
    QFETCH(KCoreConfigSkeleton*, obj);
    const char* signal = SIGNAL(fooChanged(QString));
    const QString propertyName = QStringLiteral("foo");
    const QString defaultValue = QStringLiteral("default");
    const QString newValue = QStringLiteral("changed");
    obj->setDefaults();
    obj->save();

    KConfigSkeletonItem* item = obj->findItem(propertyName);
    QVERIFY2(item, "Item must exist");
    QVERIFY2(!item->isImmutable(), "Item must not be immutable");
    QVERIFY2(!obj->isImmutable(propertyName), "Item must not be immutable");

    //listen for all expected signals
    QSignalSpy spy(obj, signal);
    QVERIFY2(spy.isValid(), signal);

    QVERIFY(item->isEqual(defaultValue));
    QVERIFY(!item->isEqual(newValue));

    item->setProperty(newValue); //change value now
    //should have no change yet, only after save()
    QCOMPARE(spy.count(), 0);
    obj->save();
    //now check for the signal emissions
    QCOMPARE(spy.count(), 1);
    QList<QVariant> args = spy.takeFirst();
    QCOMPARE(args.size(), 1);
    QVERIFY(item->isEqual(args[0]));

    //now reset to default
    QVERIFY(!item->isEqual(defaultValue));
    item->setDefault();
    QVERIFY(item->isEqual(defaultValue));
    //should have no change yet, only after save()
    QCOMPARE(spy.count(), 0);
    obj->save();
    //now check for the signal emissions
    QCOMPARE(spy.count(), 1);
    args = spy.takeFirst();
    QCOMPARE(args.size(), 1);
    QVERIFY(item->isEqual(args[0]));
}

QTEST_MAIN(KConfigCompiler_Test_Signals)

#include "kconfigcompiler_test_signals.moc"
