/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** information use the contact form at https://www.qt.io/contact-us.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#include <jni.h>

#include <QtCore/QJniEnvironment>
#include <QtCore/QJniObject>
#include <QtTest/QtTest>

static const char javaTestClass[] =
        "org/qtproject/qt/android/testdatapackage/QtJniEnvironmentTestClass";

static QString registerNativesString = QStringLiteral("Qt");

class tst_QJniEnvironment : public QObject
{
    Q_OBJECT

private slots:
    void jniEnv();
    void javaVM();
    void registerNativeMethods();
};

void tst_QJniEnvironment::jniEnv()
{
    QJniEnvironment env;
    JavaVM *javaVM = env.javaVM();
    QVERIFY(javaVM);

    {
        // JNI environment should now be attached to the current thread
        JNIEnv *jni = 0;
        QCOMPARE(javaVM->GetEnv((void**)&jni, JNI_VERSION_1_6), JNI_OK);

        JNIEnv *e = env.jniEnv();
        QVERIFY(e);

        QCOMPARE(env->GetVersion(), JNI_VERSION_1_6);

        // try to find an existing class
        QVERIFY(env->FindClass("java/lang/Object"));
        QVERIFY(!env->ExceptionCheck());

        // try to find a nonexistent class
        QVERIFY(!env->FindClass("this/doesnt/Exist"));
        QVERIFY(env->ExceptionCheck());
        env->ExceptionClear();

        QVERIFY(env->FindClass("java/lang/Object"));
        QVERIFY(!QJniEnvironment::checkAndClearExceptions(env.jniEnv()));

        // try to find a nonexistent class
        QVERIFY(!env->FindClass("this/doesnt/Exist"));
        QVERIFY(QJniEnvironment::checkAndClearExceptions(env.jniEnv()));

        // try to find an existing class with QJniEnvironment
        QJniEnvironment env;
        QVERIFY(env.findClass("java/lang/Object"));

        // try to find a nonexistent class
        QVERIFY(!env.findClass("this/doesnt/Exist"));

        // clear exception with member function
        QVERIFY(!env->FindClass("this/doesnt/Exist"));
        QVERIFY(env.checkAndClearExceptions());
    }

    // The env does not detach automatically, even if it goes out of scope. The only way it can
    // be detached is if it's done explicitly, or if the thread we attached to gets killed (TLS clean-up).
    JNIEnv *jni = nullptr;
    QCOMPARE(javaVM->GetEnv((void**)&jni, JNI_VERSION_1_6), JNI_OK);
}

void tst_QJniEnvironment::javaVM()
{
    QJniEnvironment env;
    JavaVM *javaVM = env.javaVM();
    QVERIFY(javaVM);

    QCOMPARE(env.javaVM(), javaVM);

    JavaVM *vm = 0;
    QCOMPARE(env->GetJavaVM(&vm), JNI_OK);
    QCOMPARE(env.javaVM(), vm);
}

static void callbackFromJava(JNIEnv *env, jobject /*thiz*/, jstring value)
{
    Q_UNUSED(env)
    registerNativesString = QJniObject(value).toString();
}

void tst_QJniEnvironment::registerNativeMethods()
{
    JNINativeMethod methods[] {
        {"callbackFromJava", "(Ljava/lang/String;)V", reinterpret_cast<void *>(callbackFromJava)}
    };

    QJniEnvironment env;
    QVERIFY(env.registerNativeMethods(javaTestClass, methods, 1));

    QJniObject QtString = QJniObject::fromString(registerNativesString);
    QJniObject::callStaticMethod<void>(javaTestClass,
                                       "appendJavaToString",
                                       "(Ljava/lang/String;)V",
                                        QtString.object<jstring>());
    QTest::qWait(200);
    QVERIFY(registerNativesString == QStringLiteral("From Java: Qt"));
}

QTEST_MAIN(tst_QJniEnvironment)

#include "tst_qjnienvironment.moc"