#include <iostream>
#include <fstream>
#include <streambuf>
#include <cstdio>
#include <cmath>
#include <string>
#include <armadillo>
#include <jsoncpp/json/json.h>
#include "Rbm.hpp"
#include "Layer.hpp"

using namespace std;
class RbmListener : public Rbm::IListener
{
	public:
	RbmListener() {}
	virtual ~RbmListener() {}
		
	bool onProgress(const Rbm::Status &status)
	{
		std::cout << "Progress :          " << 100*status.progress << " %" << std::endl;
		std::cout << "epoch :             " << status.epoch << std::endl;
		std::cout << "trainingSizeRemain: " << status.trainingSizeRemain << std::endl;
		std::cout << "error (per mini batch) = " << status.err << std::endl;
		std::cout << "error (total)          = " << status.err_total << std::endl;
		std::cout << "L1                     = " << status.L1 << std::endl;
		std::cout << "L2                     = " << status.L2 << std::endl;
		
		return true;
	}
};

arma::mat loadTraining(const string &filename)
{
	uint32_t numTraining = 0;
	uint32_t numVisible = 0;
	FILE *pFile;

	pFile = fopen(filename.c_str(), "r");

	if (!pFile)
	{
		std::cout << "Could not open " << filename << "!" << std::endl;
		return 0;
	}

	int result = fscanf(pFile, "%d\n", &numTraining);
	if (result < 0)
	{
		return 0;
	}
	result = fscanf(pFile, "%d\n", &numVisible);
	if (result < 0)
	{
		return 0;
	}
	arma::mat data = arma::zeros(numTraining, numVisible);

	uint32_t i, j;
	for (i=0; i < numTraining; i++)
	{
		for (j=0; j < numVisible; j++)
		{
			float v;
			int result = fscanf(pFile, "%f", &v);
			if (result > 0)
			{
				data(i, j) = v;
			}
		}
	}
	fclose(pFile);
	return data;
	
}

void saveWeight(const string &filename, size_t numVisibleX, size_t numVisibleY, const arma::mat &w, const arma::mat &bv, const arma::mat &bh)
{
	FILE *pFile;

	pFile = fopen(filename.c_str(), "w");

	if (!pFile)
	{
		std::cout << "Could not open " << filename << "!" << std::endl;
		return;
	}

	size_t numHidden = bh.n_elem;
	size_t numVisible = bv.n_elem;
	fprintf(pFile, "%d %d %d\n", (int)numVisibleX, (int)numVisibleY, (int)numHidden);

	uint32_t i, j;

	for (i=0; i < numVisible; i++)
	{
		fprintf(pFile, "%3.6f\n", bv(i));
	}
	for (i=0; i < numHidden; i++)
	{
		fprintf(pFile, "%3.6f\n", bh(i));
	}
	for (i=0; i < numVisible; i++)
	{
		for (j=0; j < numHidden; j++)
		{
			fprintf(pFile, "%3.6f ", w(i,j));
		}
		fprintf(pFile, "\n");
	}

	fclose(pFile);
}

void saveProject(const string &prjname, const Layer &layer, size_t numTraining)
{
	ofstream ofs(prjname + string(".prj"));
	
	Json::StyledWriter writer;
	Json::Value project;
	project["project"]["name"] = prjname;
	project["project"]["num_training"] = (int)numTraining;
	project["project"]["training_file"] = prjname + string(".training.dat");
	
	Json::Value jsonLayer = layer.toJson();

	Json::Value jsonLayers(Json::arrayValue);
	jsonLayers.append(jsonLayer);
	
	project["project"]["layers"] = jsonLayers;
	
	ofs << writer.write(project);
}

int main()
{
	printf("Hallo, Welt!\n");

	const string project("mnist");
	
	RbmListener statusDisplay;
	Rbm::Params rbmParams;

	arma::mat batch = loadTraining(project + string(".training.dat"));

	size_t numTraining = batch.n_rows;
	size_t numVisible = batch.n_cols;
	size_t numHidden = 64;

	Layer layer(project, 0, numVisible, numHidden);
	
	saveProject(project, layer, numTraining);

	printf("Loaded %d training samples\n", (int)numTraining);

	arma::mat w = arma::zeros(numVisible, numHidden);
	arma::mat bv = arma::zeros(1, numVisible);
	arma::mat bh = arma::zeros(1, numHidden);
	Rbm rbm(rbmParams, numVisible, numHidden);
	rbm.train(batch, 1000, 100, &statusDisplay);
	saveWeight(project + string(".weights.dat"), 28, 28, rbm.w(), rbm.bv(), rbm.bh());
	arma::mat v = arma::randu(numTraining, numVisible);
	arma::mat h = rbm.toHiddenProbs(v);
	arma::mat r = rbm.toVisibleProbs(h);
	return 0;
}