/*
  ==============================================================================

    Weights.hpp
    Created: 21 Sep 2014 1:55:15pm
    Author:  jens

  ==============================================================================
*/

#ifndef WEIGHTS_HPP
#define WEIGHTS_HPP
#include <cstdint>
#include "noise.h"

class Weights
{
public:
	Weights(const char *pFilename)
	: m_ppW(nullptr)
	, m_pBiasVisible(nullptr)
	, m_pBiasHidden(nullptr)
	, m_numVisible(0)
	, m_numHidden(0)
	{
		load(pFilename);
	}

	Weights(uint32_t numVisible, uint32_t numHidden)
	: m_ppW(nullptr)
	, m_pBiasVisible(nullptr)
	, m_pBiasHidden(nullptr)
	, m_numVisible(numVisible)
	, m_numHidden(numHidden)
	{
		alloc();
		Noise_Init(&m_noise, 0x32727155);

		shuffle(0);
	}

	Weights()
	: m_ppW(nullptr)
	, m_pBiasVisible(nullptr)
	, m_pBiasHidden(nullptr)
	, m_numVisible(0)
	, m_numHidden(0)
	{
		Noise_Init(&m_noise, 0x32727155);
	}

	~Weights()
	{
		Noise_Free(&m_noise);
		free();
	}

	void setUnits(uint32_t numVisible, uint32_t numHidden)
	{
		m_numVisible = numVisible;
		m_numHidden = numHidden;
		alloc();
		shuffle(0);
	}

	void shuffle(double stdDev)
	{
		uint32_t i, j;
		double kdev = stdDev*sqrt(12.0);

		for (j=0; j < m_numVisible; j++)
		{
			m_pBiasVisible[j] = kdev*Noise_Uniform(&m_noise, 0.5);
		}

		for (i=0; i < m_numHidden; i++)
		{
			m_pBiasHidden[i] = kdev*Noise_Uniform(&m_noise, 0.5);
		}

		for (i=0; i < m_numHidden; i++)
		{
			for (j=0; j < m_numVisible; j++)
			{
				m_ppW[i][j] = kdev*Noise_Uniform(&m_noise, 0.5);
			}
		}
	}

	double **getWeights() const
	{
		return m_ppW;
	}

	double *getBiasVisible() const
	{
		return m_pBiasVisible;
	}

	double *getBiasHidden() const
	{
		return m_pBiasHidden;
	}

	void print()
	{
		uint32_t i, j;
		double w;

		printf("\n");
		printf("w(v,h) = (v^, h>)\n");
		for (i=0; i < m_numVisible; i++)
		{
			for (j=0; j < m_numHidden; j++)
			{
				w = m_ppW[j][i];
				printf("%3.6f ", w);
			}
			printf("\n");
		}
		printf("\n");

		printf("bv = \n");
		for (i=0; i < m_numVisible; i++)
		{
			w = m_pBiasVisible[i];
			printf("%3.6f\n", w);
		}
		printf("\n");

		printf("bh = \n");
		for (i=0; i < m_numHidden; i++)
		{
			w = m_pBiasHidden[i];
			printf("%3.6f\n", w);
		}
		printf("\n");
	}

	uint32_t getNumVisible()
	{
		return m_numVisible;
	}

	uint32_t getNumHidden()
	{
		return m_numHidden;
	}

	void save(const char *pFilename)
	{
		FILE *pFile;

		pFile = fopen(pFilename,"w");

		if (!pFile)
			return;


		fprintf(pFile, "%d %d\n", m_numVisible, m_numHidden);

		uint32_t i, j;

		for (i=0; i < m_numVisible; i++)
		{
			fprintf(pFile, "%3.6f\n", m_pBiasVisible[i]);
		}
		for (i=0; i < m_numHidden; i++)
		{
			fprintf(pFile, "%3.6f\n", m_pBiasHidden[i]);
		}
		for (i=0; i < m_numVisible; i++)
		{
			for (j=0; j < m_numHidden; j++)
			{
				fprintf(pFile, "%3.6f ", m_ppW[j][i]);
			}
			fprintf(pFile, "\n");
		}

		fclose(pFile);
	}

	void load(const char *pFilename)
	{
		FILE *pFile;

		pFile = fopen(pFilename,"r");

		if (!pFile)
			return;

		m_numVisible = m_numHidden = 0;
		fscanf(pFile, "%d %d\n", &m_numVisible, &m_numHidden);

		alloc();

		uint32_t i, j;
		float v;
		for (i=0; i < m_numVisible; i++)
		{
			fscanf(pFile, "%f", &v);
			m_pBiasVisible[i] = v;
		}
		for (i=0; i < m_numHidden; i++)
		{
			fscanf(pFile, "%f", &v);
			m_pBiasHidden[i] = v;
		}
		for (i=0; i < m_numVisible; i++)
		{
			for (j=0; j < m_numHidden; j++)
			{

				fscanf(pFile, "%f", &v);
				m_ppW[j][i] = v;
			}
		}

		fclose(pFile);
	}

private:
	double **m_ppW;
	double *m_pBiasVisible;
	double *m_pBiasHidden;
	uint32_t m_numVisible;
	uint32_t m_numHidden;
	noise_gen_t m_noise;

	void alloc()
	{
		uint32_t i;

		if (m_ppW)
		{
			free();
			alloc();
		}
		else
		{
			m_ppW = new double*[m_numHidden];
			for (i=0; i < m_numHidden; i++)
			{
				m_ppW[i] = new double[m_numVisible];
			}
			m_pBiasVisible = new double[m_numVisible];
			m_pBiasHidden = new double[m_numHidden];
		}
	}

	void free()
	{
		uint32_t i;


		if (m_ppW)
		{
			for (i=0; i < m_numHidden; i++)
			{
				delete [] m_ppW[i];
			}
			delete [] m_ppW;
			m_ppW = nullptr;
		}

		delete [] m_pBiasVisible;
		m_pBiasVisible = nullptr;

		delete [] m_pBiasHidden;
		m_pBiasHidden = nullptr;
	}
};

#endif  // WEIGHTS_HPP