///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017, Carnegie Mellon University and University of Cambridge,
// all rights reserved.
//
// ACADEMIC OR NON-PROFIT ORGANIZATION NONCOMMERCIAL RESEARCH USE ONLY
//
// BY USING OR DOWNLOADING THE SOFTWARE, YOU ARE AGREEING TO THE TERMS OF THIS LICENSE AGREEMENT.  
// IF YOU DO NOT AGREE WITH THESE TERMS, YOU MAY NOT USE OR DOWNLOAD THE SOFTWARE.
//
// License can be found in OpenFace-license.txt

//     * Any publications arising from the use of this software, including but
//       not limited to academic journal and conference publications, technical
//       reports and manuals, must cite at least one of the following works:
//
//       OpenFace: an open source facial behavior analysis toolkit
//       Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency
//       in IEEE Winter Conference on Applications of Computer Vision, 2016  
//
//       Rendering of Eyes for Eye-Shape Registration and Gaze Estimation
//       Erroll Wood, Tadas Baltrušaitis, Xucong Zhang, Yusuke Sugano, Peter Robinson, and Andreas Bulling 
//       in IEEE International. Conference on Computer Vision (ICCV),  2015 
//
//       Cross-dataset learning and person-speci?c normalisation for automatic Action Unit detection
//       Tadas Baltrušaitis, Marwa Mahmoud, and Peter Robinson 
//       in Facial Expression Recognition and Analysis Challenge, 
//       IEEE International Conference on Automatic Face and Gesture Recognition, 2015 
//
//       Constrained Local Neural Fields for robust facial landmark detection in the wild.
//       Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency. 
//       in IEEE Int. Conference on Computer Vision Workshops, 300 Faces in-the-Wild Challenge, 2013.    
//
///////////////////////////////////////////////////////////////////////////////
// FaceLandmarkImg.cpp : Defines the entry point for the console application for detecting landmarks in images.

#include "LandmarkCoreIncludes.h"

// System includes
#include <fstream>

// OpenCV includes
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc.hpp>

// Boost includes
#include <filesystem.hpp>
#include <filesystem/fstream.hpp>

#include <dlib/image_processing/frontal_face_detector.h>

#include <tbb/tbb.h>

#include <FaceAnalyser.h>
#include <GazeEstimation.h>

#include <ImageCapture.h>
#include <Visualizer.h>
#include <VisualizationUtils.h>
#include <RecorderOpenFace.h>
#include <RecorderOpenFaceParameters.h>


#ifndef CONFIG_DIR
#define CONFIG_DIR "~"
#endif

using namespace std;

vector<string> get_arguments(int argc, char **argv)
{

	vector<string> arguments;

	for(int i = 0; i < argc; ++i)
	{
		arguments.push_back(string(argv[i]));
	}
	return arguments;
}

int main (int argc, char **argv)
{
		
	//Convert arguments to more convenient vector form
	vector<string> arguments = get_arguments(argc, argv);

	// no arguments: output usage
	if (arguments.size() == 1)
	{
		cout << "For command line arguments see:" << endl;
		cout << " https://github.com/TadasBaltrusaitis/OpenFace/wiki/Command-line-arguments";
		return 0;
	}

	// Prepare for image reading
	Utilities::ImageCapture image_reader;

	// The sequence reader chooses what to open based on command line arguments provided
	if (!image_reader.Open(arguments))
	{
		cout << "Could not open any images" << endl;
		return 1;
	}

	// Load the models if images found
	LandmarkDetector::FaceModelParameters det_parameters(arguments);

	// The modules that are being used for tracking
	cout << "Loading the model" << endl;
	LandmarkDetector::CLNF face_model(det_parameters.model_location);
	cout << "Model loaded" << endl;

	// Load facial feature extractor and AU analyser (make sure it is static)
	FaceAnalysis::FaceAnalyserParameters face_analysis_params(arguments);
	face_analysis_params.OptimizeForImages();
	FaceAnalysis::FaceAnalyser face_analyser(face_analysis_params);

	// If bounding boxes not provided, use a face detector
	cv::CascadeClassifier classifier(det_parameters.face_detector_location);
	dlib::frontal_face_detector face_detector_hog = dlib::get_frontal_face_detector();

	// A utility for visualizing the results
	Utilities::Visualizer visualizer(arguments);

	cv::Mat captured_image;

 	captured_image = image_reader.GetNextImage();

	if (!face_model.eye_model)
	{
		cout << "WARNING: no eye model found" << endl;
	}

	if (face_analyser.GetAUClassNames().size() == 0 && face_analyser.GetAUClassNames().size() == 0)
	{
		cout << "WARNING: no Action Unit models found" << endl;
	}

	cout << "Starting tracking" << endl;
	while (!captured_image.empty())
	{

		Utilities::RecorderOpenFaceParameters recording_params(arguments, false, false,
			image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy);
		if (!face_model.eye_model)
		{
			recording_params.setOutputGaze(false);
		}
		Utilities::RecorderOpenFace open_face_rec(image_reader.name, recording_params, arguments);

		visualizer.SetImage(captured_image, image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy);


		// Making sure the image is in uchar grayscale
		cv::Mat_<uchar> grayscale_image = image_reader.GetGrayFrame();

		// Detect faces in an image
		vector<cv::Rect_<double> > face_detections;

		if (image_reader.has_bounding_boxes)
		{
			face_detections = image_reader.GetBoundingBoxes();
		}
		else
		{
			if (det_parameters.curr_face_detector == LandmarkDetector::FaceModelParameters::HOG_SVM_DETECTOR)
			{
				vector<double> confidences;
				LandmarkDetector::DetectFacesHOG(face_detections, grayscale_image, face_detector_hog, confidences);
			}
			else
			{
				LandmarkDetector::DetectFaces(face_detections, grayscale_image, classifier);
			}
		}

		// Detect landmarks around detected faces
		int face_det = 0;
		// perform landmark detection for every face detected
		for (size_t face = 0; face < face_detections.size(); ++face)
		{
			// if there are multiple detections go through them
			bool success = LandmarkDetector::DetectLandmarksInImage(grayscale_image, face_detections[face], face_model, det_parameters);

			// Estimate head pose and eye gaze				
			cv::Vec6d pose_estimate = LandmarkDetector::GetPose(face_model, image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy);

			// Gaze tracking, absolute gaze direction
			cv::Point3f gaze_direction0(0, 0, -1);
			cv::Point3f gaze_direction1(0, 0, -1);
			cv::Vec2d gaze_angle(0, 0);

			if (face_model.eye_model)
			{
				GazeAnalysis::EstimateGaze(face_model, gaze_direction0, image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy, true);
				GazeAnalysis::EstimateGaze(face_model, gaze_direction1, image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy, false);
				gaze_angle = GazeAnalysis::GetGazeAngle(gaze_direction0, gaze_direction1);
			}

			cv::Mat sim_warped_img;
			cv::Mat_<double> hog_descriptor; int num_hog_rows = 0, num_hog_cols = 0;

			// Perform AU detection and HOG feature extraction, as this can be expensive only compute it if needed by output or visualization
			if (recording_params.outputAlignedFaces() || recording_params.outputHOG() || recording_params.outputAUs() || visualizer.vis_align || visualizer.vis_hog)
			{
				face_analyser.PredictStaticAUsAndComputeFeatures(captured_image, face_model.detected_landmarks);
				face_analyser.GetLatestAlignedFace(sim_warped_img);
				face_analyser.GetLatestHOG(hog_descriptor, num_hog_rows, num_hog_cols);
			}

			// Displaying the tracking visualizations
			visualizer.SetObservationFaceAlign(sim_warped_img);
			visualizer.SetObservationHOG(hog_descriptor, num_hog_rows, num_hog_cols);
			visualizer.SetObservationLandmarks(face_model.detected_landmarks, 1.0, face_model.GetVisibilities()); // Set confidence to high to make sure we always visualize
			visualizer.SetObservationPose(pose_estimate, 1.0);
			visualizer.SetObservationGaze(gaze_direction0, gaze_direction1, LandmarkDetector::CalculateAllEyeLandmarks(face_model), LandmarkDetector::Calculate3DEyeLandmarks(face_model, image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy), face_model.detection_certainty);
			visualizer.SetObservationActionUnits(face_analyser.GetCurrentAUsReg(), face_analyser.GetCurrentAUsClass());

			// Setting up the recorder output
			open_face_rec.SetObservationHOG(face_model.detection_success, hog_descriptor, num_hog_rows, num_hog_cols, 31); // The number of channels in HOG is fixed at the moment, as using FHOG
			open_face_rec.SetObservationVisualization(visualizer.GetVisImage());
			open_face_rec.SetObservationActionUnits(face_analyser.GetCurrentAUsReg(), face_analyser.GetCurrentAUsClass());
			open_face_rec.SetObservationLandmarks(face_model.detected_landmarks, face_model.GetShape(image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy),
				face_model.params_global, face_model.params_local, face_model.detection_certainty, face_model.detection_success);
			open_face_rec.SetObservationPose(pose_estimate);
			open_face_rec.SetObservationGaze(gaze_direction0, gaze_direction1, gaze_angle, LandmarkDetector::CalculateAllEyeLandmarks(face_model), LandmarkDetector::Calculate3DEyeLandmarks(face_model, image_reader.fx, image_reader.fy, image_reader.cx, image_reader.cy));
			open_face_rec.SetObservationFaceAlign(sim_warped_img);
			open_face_rec.SetObservationFaceID(face);
			open_face_rec.WriteObservation();

		}
		if(face_detections.size() > 0)
		{
			visualizer.ShowObservation();
		}

		// Grabbing the next frame in the sequence
		captured_image = image_reader.GetNextImage();

	}
	
	return 0;
}