#ifndef MLPP_GAN_hpp
#define MLPP_GAN_hpp

//
//  GAN.hpp
//
//  Created by Marc Melikyan on 11/4/20.
//

#include "../hidden_layer/hidden_layer.h"
#include "../output_layer/output_layer.h"

#include <string>
#include <tuple>
#include <vector>



class MLPPGAN {
public:
	MLPPGAN(double k, std::vector<std::vector<double>> outputSet);
	~MLPPGAN();
	std::vector<std::vector<double>> generateExample(int n);
	void gradientDescent(double learning_rate, int max_epoch, bool UI = 1);
	double score();
	void save(std::string fileName);

	void addLayer(int n_hidden, std::string activation, std::string weightInit = "Default", std::string reg = "None", double lambda = 0.5, double alpha = 0.5);
	void addOutputLayer(std::string weightInit = "Default", std::string reg = "None", double lambda = 0.5, double alpha = 0.5);

private:
	std::vector<std::vector<double>> modelSetTestGenerator(std::vector<std::vector<double>> X); // Evaluator for the generator of the gan.
	std::vector<double> modelSetTestDiscriminator(std::vector<std::vector<double>> X); // Evaluator for the discriminator of the gan.

	double Cost(std::vector<double> y_hat, std::vector<double> y);

	void forwardPass();
	void updateDiscriminatorParameters(std::vector<std::vector<std::vector<double>>> hiddenLayerUpdations, std::vector<double> outputLayerUpdation, double learning_rate);
	void updateGeneratorParameters(std::vector<std::vector<std::vector<double>>> hiddenLayerUpdations, double learning_rate);
	std::tuple<std::vector<std::vector<std::vector<double>>>, std::vector<double>> computeDiscriminatorGradients(std::vector<double> y_hat, std::vector<double> outputSet);
	std::vector<std::vector<std::vector<double>>> computeGeneratorGradients(std::vector<double> y_hat, std::vector<double> outputSet);

	void UI(int epoch, double cost_prev, std::vector<double> y_hat, std::vector<double> outputSet);

	std::vector<std::vector<double>> outputSet;
	std::vector<double> y_hat;

	std::vector<MLPPHiddenLayer> network;
	MLPPOutputLayer *outputLayer;

	int n;
	int k;
};


#endif /* GAN_hpp */