#ifndef ANDROID_CONTROLLER_H
#define ANDROID_CONTROLLER_H

#include <QJniObject>

#include "protocols/vpnprotocol.h"

using namespace amnezia;

class AndroidController : public QObject
{
    Q_OBJECT

public:
    explicit AndroidController();
    static AndroidController *instance();

    bool initialize();

    // keep synchronized with org.amnezia.vpn.protocol.ProtocolState
    enum class ConnectionState {
        CONNECTED,
        CONNECTING,
        DISCONNECTED,
        DISCONNECTING,
        RECONNECTING,
        UNKNOWN
    };

    ErrorCode start(const QJsonObject &vpnConfig);
    void stop();
    void setNotificationText(const QString &title, const QString &message, int timerSec);
    void saveFile(const QString& fileName, const QString &data);
    QString openFile(const QString &filter);
    void startQrReaderActivity();

signals:
    void connectionStateChanged(Vpn::ConnectionState state);
    void status(ConnectionState state);
    void serviceDisconnected();
    void serviceError();
    void vpnPermissionRejected();
    void vpnConnected();
    void vpnDisconnected();
    void vpnReconnecting();
    void statisticsUpdated(quint64 rxBytes, quint64 txBytes);
    void fileOpened(QString uri);
    void configImported(QString config);
    void importConfigFromOutside(QString config);
    void initConnectionState(Vpn::ConnectionState state);

private:
    bool isWaitingStatus = true;

    void qtAndroidControllerInitialized();

    static Vpn::ConnectionState convertState(ConnectionState state);
    static QString textConnectionState(ConnectionState state);

    // JNI functions called by Android
    static void onStatus(JNIEnv *env, jobject thiz, jint stateCode);
    static void onServiceDisconnected(JNIEnv *env, jobject thiz);
    static void onServiceError(JNIEnv *env, jobject thiz);
    static void onVpnPermissionRejected(JNIEnv *env, jobject thiz);
    static void onVpnConnected(JNIEnv *env, jobject thiz);
    static void onVpnDisconnected(JNIEnv *env, jobject thiz);
    static void onVpnReconnecting(JNIEnv *env, jobject thiz);
    static void onStatisticsUpdate(JNIEnv *env, jobject thiz, jlong rxBytes, jlong txBytes);
    static void onConfigImported(JNIEnv *env, jobject thiz, jstring data);
    static void onFileOpened(JNIEnv *env, jobject thiz, jstring uri);
    static bool decodeQrCode(JNIEnv *env, jobject thiz, jstring data);

    template <typename Ret, typename ...Args>
    static auto callActivityMethod(const char *methodName, const char *signature,
                                   const std::function<Ret()> &defValue, Args &&...args);
    template <typename ...Args>
    static void callActivityMethod(const char *methodName, const char *signature, Args &&...args);
};

#endif // ANDROID_CONTROLLER_H