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#include "androidconnectivitymanager.h"

#include <QtCore/private/qjnihelpers_p.h>
#include <QtCore/qjnienvironment.h>

QT_BEGIN_NAMESPACE

struct AndroidConnectivityManagerInstance
{
    AndroidConnectivityManagerInstance() : connManager(new AndroidConnectivityManager) { }
    std::unique_ptr<AndroidConnectivityManager> connManager = nullptr;
};
Q_GLOBAL_STATIC(AndroidConnectivityManagerInstance, androidConnManagerInstance)

static const char networkInformationClass[] =
        "org/qtproject/qt/android/networkinformation/QtAndroidNetworkInformation";

static void networkConnectivityChanged()
{
    Q_EMIT androidConnManagerInstance->connManager->connectivityChanged();
}

AndroidConnectivityManager::AndroidConnectivityManager()
{
    if (!registerNatives())
        return;

    m_connectivityManager = QJniObject::callStaticObjectMethod(
            networkInformationClass, "getConnectivityManager",
            "(Landroid/content/Context;)Landroid/net/ConnectivityManager;",
            QtAndroidPrivate::context());
    if (!m_connectivityManager.isValid())
        return;

    QJniObject::callStaticMethod<void>(networkInformationClass, "registerReceiver",
                                       "(Landroid/content/Context;)V", QtAndroidPrivate::context());
}

AndroidConnectivityManager *AndroidConnectivityManager::getInstance()
{
    if (!androidConnManagerInstance())
        return nullptr;
    return androidConnManagerInstance->connManager->isValid()
            ? androidConnManagerInstance->connManager.get()
            : nullptr;
}

AndroidConnectivityManager::~AndroidConnectivityManager()
{
    QJniObject::callStaticMethod<void>(networkInformationClass, "unregisterReceiver",
                                       "(Landroid/content/Context;)V", QtAndroidPrivate::context());
}

AndroidConnectivityManager::AndroidConnectivity AndroidConnectivityManager::networkConnectivity()
{
    QJniEnvironment env;
    QJniObject networkReceiver(networkInformationClass);
    jclass clazz = env->GetObjectClass(networkReceiver.object());
    static const QByteArray functionSignature =
            QByteArray(QByteArray("()L") + networkInformationClass + "$AndroidConnectivity;");
    QJniObject enumObject =
            QJniObject::callStaticObjectMethod(clazz, "state", functionSignature.data());
    if (!enumObject.isValid())
        return AndroidConnectivityManager::AndroidConnectivity::Unknown;

    QJniObject enumName = enumObject.callObjectMethod<jstring>("name");
    if (!enumName.isValid())
        return AndroidConnectivityManager::AndroidConnectivity::Unknown;

    QString name = enumName.toString();
    if (name == u"Connected")
        return AndroidConnectivity::Connected;
    if (name == u"Disconnected")
        return AndroidConnectivity::Disconnected;
    return AndroidConnectivity::Unknown;
}

bool AndroidConnectivityManager::registerNatives()
{
    QJniEnvironment env;
    QJniObject networkReceiver(networkInformationClass);
    if (!networkReceiver.isValid())
        return false;

    jclass clazz = env->GetObjectClass(networkReceiver.object());
    static JNINativeMethod method = { "connectivityChanged", "()V",
                                      reinterpret_cast<void *>(networkConnectivityChanged) };
    const bool ret = (env->RegisterNatives(clazz, &method, 1) == JNI_OK);
    env->DeleteLocalRef(clazz);
    return ret;
}

QT_END_NAMESPACE
