/*
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 */

/* 
 * File:   AStack.hpp
 * Author: jens
 *
 * Created on 16. Januar 2022, 13:55
 */

#ifndef ASTACK_HPP
#define ASTACK_HPP

#include <string>
#include <vector>
#include <armadillo>
#include <jsoncpp/json/json.h>
#include "Layer.hpp"

class LayerConstructor
{
public:
	LayerConstructor() {}
	virtual ~LayerConstructor() {}
	
	virtual Layer* onConstruct(const std::string &name, size_t id, size_t numVisibleX, size_t numVisibleY, size_t numHidden, size_t numContext)
	{
		return nullptr;
	}
};

class AStack
{
public:
	enum StackType
	{
		None,
		Deep,
		Rnn,
		NUM_STACKTYPES
	};

	const char *stackTypeStrings[NUM_STACKTYPES] = {"None", "Deep", "Rnn"};
	
	AStack(const std::string &dir, StackType type, const std::string &name);
	AStack(const AStack& orig);
	virtual ~AStack();
	
	void setName(const std::string &name);
	size_t numLayers();
	void addLayer(Layer *pLayer);
	void delLayer(Layer *pLayer);
	
	Layer* getLayer(size_t layerId) const;

	bool load(LayerConstructor *pLayerConstructor=nullptr);
	bool save();

	void weightsInit(double stddev);
	bool loadWeights();
	bool saveWeights();

    arma::mat upPass(size_t layerId, arma::mat const &v);
    arma::mat downPass(size_t layerId, arma::mat const &h);
    arma::mat upDownPass(size_t layerId, arma::mat const &v);

protected:
	StackType m_type;
	std::string m_name;
	Layer *m_pLayers;
	std::string m_dir;

};

#endif /* ASTACK_HPP */