#include <DetectionBasedTracker_jni.h>
#include <opencv2/core/core.hpp>
#include <opencv2/contrib/detection_based_tracker.hpp>

#include <string>
#include <vector>

#include <android/log.h>

#define LOG_TAG "FaceDetection/DetectionBasedTracker"
#define LOGD(...) ((void)__android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__))

using namespace std;
using namespace cv;

inline void vector_Rect_to_Mat(vector<Rect>& v_rect, Mat& mat)
{
    mat = Mat(v_rect, true);
}

class CascadeDetectorAdapter: public DetectionBasedTracker::IDetector
{
public:
    CascadeDetectorAdapter(cv::Ptr<cv::CascadeClassifier> detector):
            IDetector(),
            Detector(detector)
    {
        LOGD("CascadeDetectorAdapter::Detect::Detect");
        CV_Assert(detector);
    }

    void detect(const cv::Mat &Image, std::vector<cv::Rect> &objects)
    {
        LOGD("CascadeDetectorAdapter::Detect: begin");
        LOGD("CascadeDetectorAdapter::Detect: scaleFactor=%.2f, minNeighbours=%d, minObjSize=(%dx%d), maxObjSize=(%dx%d)", scaleFactor, minNeighbours, minObjSize.width, minObjSize.height, maxObjSize.width, maxObjSize.height);
        Detector->detectMultiScale(Image, objects, scaleFactor, minNeighbours, 0, minObjSize, maxObjSize);
        LOGD("CascadeDetectorAdapter::Detect: end");
    }

    virtual ~CascadeDetectorAdapter()
    {
        LOGD("CascadeDetectorAdapter::Detect::~Detect");
    }

private:
    CascadeDetectorAdapter();
    cv::Ptr<cv::CascadeClassifier> Detector;
};

struct DetectorAgregator
{
    cv::Ptr<CascadeDetectorAdapter> mainDetector;
    cv::Ptr<CascadeDetectorAdapter> trackingDetector;

    cv::Ptr<DetectionBasedTracker> tracker;
    DetectorAgregator(cv::Ptr<CascadeDetectorAdapter>& _mainDetector, cv::Ptr<CascadeDetectorAdapter>& _trackingDetector):
            mainDetector(_mainDetector),
            trackingDetector(_trackingDetector)
    {
        CV_Assert(_mainDetector);
        CV_Assert(_trackingDetector);

        DetectionBasedTracker::Parameters DetectorParams;
        tracker = makePtr<DetectionBasedTracker>(mainDetector, trackingDetector, DetectorParams);
    }
};

JNIEXPORT jlong JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeCreateObject
(JNIEnv * jenv, jclass, jstring jFileName, jint faceSize)
{
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeCreateObject enter");
    const char* jnamestr = jenv->GetStringUTFChars(jFileName, NULL);
    string stdFileName(jnamestr);
    jlong result = 0;

    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeCreateObject");

    try
    {
        cv::Ptr<CascadeDetectorAdapter> mainDetector = makePtr<CascadeDetectorAdapter>(
            makePtr<CascadeClassifier>(stdFileName));
        cv::Ptr<CascadeDetectorAdapter> trackingDetector = makePtr<CascadeDetectorAdapter>(
            makePtr<CascadeClassifier>(stdFileName));
        result = (jlong)new DetectorAgregator(mainDetector, trackingDetector);
        if (faceSize > 0)
        {
            mainDetector->setMinObjectSize(Size(faceSize, faceSize));
            //trackingDetector->setMinObjectSize(Size(faceSize, faceSize));
        }
    }
    catch(cv::Exception& e)
    {
        LOGD("nativeCreateObject caught cv::Exception: %s", e.what());
        jclass je = jenv->FindClass("org/opencv/core/CvException");
        if(!je)
            je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, e.what());
    }
        catch (...)
        {
        LOGD("nativeCreateObject caught unknown exception");
        jclass je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, "Unknown exception in JNI code {Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeCreateObject(...)}");
        return 0;
    }

    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeCreateObject exit");
    return result;
}

JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDestroyObject
(JNIEnv * jenv, jclass, jlong thiz)
{
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDestroyObject");

    try
    {
        if(thiz != 0)
        {
            ((DetectorAgregator*)thiz)->tracker->stop();
            delete (DetectorAgregator*)thiz;
        }
    }
    catch(cv::Exception& e)
    {
        LOGD("nativeestroyObject caught cv::Exception: %s", e.what());
        jclass je = jenv->FindClass("org/opencv/core/CvException");
        if(!je)
            je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, e.what());
    }
    catch (...)
    {
        LOGD("nativeDestroyObject caught unknown exception");
        jclass je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, "Unknown exception in JNI code {Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDestroyObject(...)}");
    }
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDestroyObject exit");
}

JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStart
(JNIEnv * jenv, jclass, jlong thiz)
{
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStart");

    try
    {
        ((DetectorAgregator*)thiz)->tracker->run();
    }
    catch(cv::Exception& e)
    {
        LOGD("nativeStart caught cv::Exception: %s", e.what());
        jclass je = jenv->FindClass("org/opencv/core/CvException");
        if(!je)
            je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, e.what());
    }
    catch (...)
    {
        LOGD("nativeStart caught unknown exception");
        jclass je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, "Unknown exception in JNI code {Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStart(...)}");
    }
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStart exit");
}

JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStop
(JNIEnv * jenv, jclass, jlong thiz)
{
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStop");

    try
    {
        ((DetectorAgregator*)thiz)->tracker->stop();
    }
    catch(cv::Exception& e)
    {
        LOGD("nativeStop caught cv::Exception: %s", e.what());
        jclass je = jenv->FindClass("org/opencv/core/CvException");
        if(!je)
            je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, e.what());
    }
    catch (...)
    {
        LOGD("nativeStop caught unknown exception");
        jclass je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, "Unknown exception in JNI code {Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStop(...)}");
    }
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeStop exit");
}

JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeSetFaceSize
(JNIEnv * jenv, jclass, jlong thiz, jint faceSize)
{
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeSetFaceSize -- BEGIN");

    try
    {
        if (faceSize > 0)
        {
            ((DetectorAgregator*)thiz)->mainDetector->setMinObjectSize(Size(faceSize, faceSize));
            //((DetectorAgregator*)thiz)->trackingDetector->setMinObjectSize(Size(faceSize, faceSize));
        }
    }
    catch(cv::Exception& e)
    {
        LOGD("nativeStop caught cv::Exception: %s", e.what());
        jclass je = jenv->FindClass("org/opencv/core/CvException");
        if(!je)
            je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, e.what());
    }
    catch (...)
    {
        LOGD("nativeSetFaceSize caught unknown exception");
        jclass je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, "Unknown exception in JNI code {Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeSetFaceSize(...)}");
    }
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeSetFaceSize -- END");
}


JNIEXPORT void JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDetect
(JNIEnv * jenv, jclass, jlong thiz, jlong imageGray, jlong faces)
{
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDetect");

    try
    {
        vector<Rect> RectFaces;
        ((DetectorAgregator*)thiz)->tracker->process(*((Mat*)imageGray));
        ((DetectorAgregator*)thiz)->tracker->getObjects(RectFaces);
        *((Mat*)faces) = Mat(RectFaces, true);
    }
    catch(cv::Exception& e)
    {
        LOGD("nativeCreateObject caught cv::Exception: %s", e.what());
        jclass je = jenv->FindClass("org/opencv/core/CvException");
        if(!je)
            je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, e.what());
    }
    catch (...)
    {
        LOGD("nativeDetect caught unknown exception");
        jclass je = jenv->FindClass("java/lang/Exception");
        jenv->ThrowNew(je, "Unknown exception in JNI code {Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDetect(...)}");
    }
    LOGD("Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeDetect END");
}