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//
//  !!! this sample requires the opencv_datasets module !!!
//

#include "opencv2/opencv_modules.hpp"
#ifdef HAVE_OPENCV_DATASETS

#include "opencv2/datasets/track_vot.hpp"
#include <opencv2/core/utility.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>

#include <iostream>

using namespace std;
using namespace cv;
using namespace cv::datasets;

#define NUM_TEST_FRAMES 300
#define TEST_VIDEO_INDEX 1		//TLD Dataset Video Index from 1-10
//#define RECORD_VIDEO_FLG

static Mat image;
static Rect2d boundingBox;
static bool paused;
static bool selectObject = false;
static bool startSelection = false;

static const char* keys =
{ "{@tracker_algorithm | | Tracker algorithm }"
"{@dataset_path     |true| Dataset path     }"
"{@dataset_id     |1| Dataset ID     }"
};

static void onMouse(int event, int x, int y, int, void*)
{
	if (!selectObject)
	{
		switch (event)
		{
		case EVENT_LBUTTONDOWN:
			//set origin of the bounding box
			startSelection = true;
			boundingBox.x = x;
			boundingBox.y = y;
			boundingBox.width = boundingBox.height = 0;
			break;
		case EVENT_LBUTTONUP:
			//sei with and height of the bounding box
			boundingBox.width = std::abs(x - boundingBox.x);
			boundingBox.height = std::abs(y - boundingBox.y);
			paused = false;
			selectObject = true;
			break;
		case EVENT_MOUSEMOVE:

			if (startSelection && !selectObject)
			{
				//draw the bounding box
				Mat currentFrame;
				image.copyTo(currentFrame);
				rectangle(currentFrame, Point((int)boundingBox.x, (int)boundingBox.y), Point(x, y), Scalar(255, 0, 0), 2, 1);
				imshow("Tracking API", currentFrame);
			}
			break;
		}
	}
}

static void help()
{
	cout << "\nThis example shows the functionality of \"Long-term optical tracking API\""
		"TLD dataset ID: 1~10, VOT2015 dataset ID: 1~60\n"
		"-- pause video [p] and draw a bounding box around the target to start the tracker\n"
		"Example:\n"
		"./example_tracking_tracker_dataset <tracker_algorithm> <dataset_path> <dataset_id>\n"
		<< endl;

	cout << "\n\nHot keys: \n"
		"\tq - quit the program\n"
		"\tp - pause video\n";
}

int main(int argc, char *argv[])
{
	CommandLineParser parser(argc, argv, keys);
	string tracker_algorithm = parser.get<string>(0);
	string datasetRootPath = parser.get<string>(1);
	int datasetID = parser.get<int>(2);
	if (tracker_algorithm.empty() || datasetRootPath.empty())
	{
		help();
		return -1;
	}

	Mat frame;
	paused = false;
	namedWindow("Tracking API", 0);
	setMouseCallback("Tracking API", onMouse, 0);

	//Create Tracker
	Ptr<Tracker> tracker = Tracker::create(tracker_algorithm);
	if (tracker == NULL)
	{
		cout << "***Error in the instantiation of the tracker...***\n";
		getchar();
		return 0;
	}

	//Init Dataset
	Ptr<TRACK_vot> dataset = TRACK_vot::create();
	dataset->load(datasetRootPath);
	dataset->initDataset(datasetID);

	//Read first frame
	dataset->getNextFrame(frame);
	frame.copyTo(image);

	rectangle(image, boundingBox, Scalar(255, 0, 0), 2, 1);
	imshow("Tracking API", image);


	bool initialized = false;
	paused = true;
	int frameCounter = 0;

	//Time measurment
	int64 e3 = getTickCount();
	for (;;)
	{
		if (!paused)
		{
			//Time measurment
			int64 e1 = getTickCount();
			if (initialized){
				if (!dataset->getNextFrame(frame))
					break;
				frame.copyTo(image);
			}

			if (!initialized && selectObject)
			{
				//initializes the tracker
				if (!tracker->init(frame, boundingBox))
				{
					cout << "***Could not initialize tracker...***\n";
					return -1;
				}
				initialized = true;
			}
			else if (initialized)
			{
				//updates the tracker
				if (tracker->update(frame, boundingBox))
				{
					rectangle(image, boundingBox, Scalar(255, 0, 0), 2, 1);
				}
			}
			imshow("Tracking API", image);
			frameCounter++;
			//Time measurment
			int64 e2 = getTickCount();
			double t1 = (e2 - e1) / getTickFrequency();
			cout << frameCounter << "\tframe :  " << t1 * 1000.0 << "ms" << endl;
		}

		char c = (char)waitKey(2);
		if (c == 'q')
			break;
		if (c == 'p')
			paused = !paused;



		//waitKey(0);
	}

	//Time measurment
	int64 e4 = getTickCount();
	double t2 = (e4 - e3) / getTickFrequency();
	cout << "Average Time for Frame:  " << t2 * 1000.0 / frameCounter << "ms" << endl;
	cout << "Average FPS:  " << 1.0 / t2*frameCounter << endl;


	waitKey(0);

	return 0;
}



#else // ! HAVE_OPENCV_DATASETS
int main() {
	CV_Error(cv::Error::StsNotImplemented , "this sample needs to be built with opencv_datasets !");
	return -1;
}
#endif // HAVE_OPENCV_DATASETS