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#include "jsurfacetexture.h"
#include <QtCore/private/qjni_p.h>
#include <QtCore/private/qjnihelpers_p.h>

QT_BEGIN_NAMESPACE

static jclass g_qtSurfaceTextureListenerClass = 0;
static QMap<int, JSurfaceTexture*> g_objectMap;

// native method for QtSurfaceTexture.java
static void notifyFrameAvailable(JNIEnv* , jobject, int id)
{
    JSurfaceTexture *obj = g_objectMap.value(id, 0);
    if (obj)
        Q_EMIT obj->frameAvailable();
}

JSurfaceTexture::JSurfaceTexture(unsigned int texName)
    : QObject()
    , m_texID(int(texName))
{
    // API level 11 or higher is required
    if (QtAndroidPrivate::androidSdkVersion() < 11) {
        qWarning("Camera preview and video playback require Android 3.0 (API level 11) or later.");
        return;
    }

    QJNIEnvironmentPrivate env;
    m_surfaceTexture = QJNIObjectPrivate("android/graphics/SurfaceTexture", "(I)V", jint(texName));
    if (env->ExceptionCheck()) {
#ifdef QT_DEBUG
        env->ExceptionDescribe();
#endif // QT_DEBUG
        env->ExceptionClear();
    }

    if (m_surfaceTexture.isValid())
        g_objectMap.insert(int(texName), this);

    QJNIObjectPrivate listener(g_qtSurfaceTextureListenerClass, "(I)V", jint(texName));
    m_surfaceTexture.callMethod<void>("setOnFrameAvailableListener",
                                      "(Landroid/graphics/SurfaceTexture$OnFrameAvailableListener;)V",
                                      listener.object());
}

JSurfaceTexture::~JSurfaceTexture()
{
    if (m_surfaceTexture.isValid()) {
        release();
        g_objectMap.remove(m_texID);
    }
}

QMatrix4x4 JSurfaceTexture::getTransformMatrix()
{
    QMatrix4x4 matrix;
    if (!m_surfaceTexture.isValid())
        return matrix;

    QJNIEnvironmentPrivate env;

    jfloatArray array = env->NewFloatArray(16);
    m_surfaceTexture.callMethod<void>("getTransformMatrix", "([F)V", array);
    env->GetFloatArrayRegion(array, 0, 16, matrix.data());
    env->DeleteLocalRef(array);

    return matrix;
}

void JSurfaceTexture::release()
{
    if (QtAndroidPrivate::androidSdkVersion() < 14)
        return;

    m_surfaceTexture.callMethod<void>("release");
}

void JSurfaceTexture::updateTexImage()
{
    if (!m_surfaceTexture.isValid())
        return;

    m_surfaceTexture.callMethod<void>("updateTexImage");
}

jobject JSurfaceTexture::object()
{
    return m_surfaceTexture.object();
}

static JNINativeMethod methods[] = {
    {"notifyFrameAvailable", "(I)V", (void *)notifyFrameAvailable}
};

bool JSurfaceTexture::initJNI(JNIEnv *env)
{
    // SurfaceTexture is available since API 11.
    if (QtAndroidPrivate::androidSdkVersion() < 11)
        return false;

    jclass clazz = env->FindClass("org/qtproject/qt5/android/multimedia/QtSurfaceTextureListener");
    if (env->ExceptionCheck())
        env->ExceptionClear();

    if (clazz) {
        g_qtSurfaceTextureListenerClass = static_cast<jclass>(env->NewGlobalRef(clazz));
        if (env->RegisterNatives(g_qtSurfaceTextureListenerClass,
                                 methods,
                                 sizeof(methods) / sizeof(methods[0])) < 0) {
            return false;
        }
    }

    return true;
}

QT_END_NAMESPACE