/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Quick 3D.
**
** $QT_BEGIN_LICENSE:GPL$
** 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
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QTest>
#include <QSignalSpy>
#include <QtQuick3D/private/qquick3dperspectivecamera_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrendercamera_p.h>

class tst_QQuick3DPerspectiveCamera : public QObject
{
    Q_OBJECT

    // Work-around to get access to updateSpatialNode
    class Camera : public QQuick3DPerspectiveCamera
    {
    public:
        using QQuick3DCamera::updateSpatialNode;
    };

private slots:
    void testClipAndFov();
    void mapToViewport();
};

void tst_QQuick3DPerspectiveCamera::testClipAndFov()
{
    Camera camera;
    auto node = static_cast<QSSGRenderCamera *>(camera.updateSpatialNode(nullptr));
    const auto originalNode = node; // for comparisons later...
    QVERIFY(node);

    const float clipNear = 0.2f;
    camera.setClipNear(clipNear);
    node = static_cast<QSSGRenderCamera *>(camera.updateSpatialNode(node));
    QCOMPARE(originalNode, node);
    QVERIFY(node->flags.testFlag(QSSGRenderNode::Flag::CameraDirty));
    QCOMPARE(clipNear, node->clipNear);

    const float clipFar = 0.4f;
    camera.setClipFar(clipFar);
    node = static_cast<QSSGRenderCamera *>(camera.updateSpatialNode(node));
    QCOMPARE(originalNode, node);
    QVERIFY(node->flags.testFlag(QSSGRenderNode::Flag::CameraDirty));
    QCOMPARE(clipFar, node->clipFar);

    const float fov = 6.2f;
    camera.setFieldOfView(fov);
    node = static_cast<QSSGRenderCamera *>(camera.updateSpatialNode(node));
    QCOMPARE(originalNode, node);
    QVERIFY(node->flags.testFlag(QSSGRenderNode::Flag::CameraDirty));
    QCOMPARE(fov, qRadiansToDegrees(node->fov)); // It gets converted inside, so we convert back

    const QQuick3DPerspectiveCamera::FieldOfViewOrientation fovOrientation
            = QQuick3DPerspectiveCamera::FieldOfViewOrientation::Horizontal;
    camera.setFieldOfViewOrientation(fovOrientation);
    node = static_cast<QSSGRenderCamera *>(camera.updateSpatialNode(node));
    QCOMPARE(originalNode, node);
    QVERIFY(node->flags.testFlag(QSSGRenderNode::Flag::CameraDirty));
    QVERIFY(node->fovHorizontal == true);
    camera.setFieldOfViewOrientation(QQuick3DPerspectiveCamera::FieldOfViewOrientation::Vertical);
    node = static_cast<QSSGRenderCamera *>(camera.updateSpatialNode(node));
    QVERIFY(node->fovHorizontal == false);
}

void tst_QQuick3DPerspectiveCamera::mapToViewport()
{
    Camera camera;
    auto node = static_cast<QSSGRenderCamera *>(camera.updateSpatialNode(nullptr));
    QVERIFY(node);

    // QTBUG-100832
    const QVector3D largeValue(-3.40282e+38, 3.40282e+38, 3.40282e+38);
    QVector3D result = camera.mapToViewport(largeValue);
    QVERIFY(result.isNull());
}

QTEST_APPLESS_MAIN(tst_QQuick3DPerspectiveCamera)
#include "tst_qquick3dperspectivecamera.moc"
