/**
 * DESCRIPTION OF THE FILE
 *
 * @author Michal Kravčenko
 * @date 15.3.19 -
 */


#include <iostream>
#include <cstdio>
#include <fstream>
#include <vector>
#include <utility>
#include <algorithm>
#include <assert.h>

#include "4neuro.h"
#include "../LearningMethods/RandomSolution.h"

int main(int argc, char** argv) {

    //TODO NORMALIZACI NEPOUZIVAT KVULI CASOVYM POSUNUM
    bool normalize_data = false;
    double prec = 1e-9;
    double prec_lm = 1e-9;
    int restart_interval = 500;
    int max_n_iters_gradient = 10000;
    int max_n_iters_gradient_lm = 10000;

    int max_n_iters_swarm = 20;
    int n_particles_swarm = 200;
    unsigned long batch_size = 0;
    int max_number_of_cycles = 1;
    try {
        /* PHASE 2 - TRAINING DATA LOADING, SIMPLE SIMULATION */
        l4n::CSVReader reader1("../../../data_files/data_BACK_RH_1.csv", ";", true);  // File, separator, skip 1st line
        reader1.read();  // Read from the file

        /* PHASE 2 - NEURAL NETWORK SPECIFICATION */
        /* Create data set for both the first training of the neural network */
        /* Specify which columns are inputs or outputs */
        std::vector<unsigned int> inputs = { 0 };  // Possible multiple inputs, e.g. {0,3}, column indices starting from 0
        std::vector<unsigned int> outputs = { 2 };  // Possible multiple outputs, e.g. {1,2}
        l4n::DataSet ds1 = reader1.get_data_set(&inputs, &outputs);  // Creation of data-set for NN
        if(normalize_data){
            ds1.normalize();  // Normalization of data to prevent numerical problems
        }

        /* Numbers of neurons in layers (including input and output layers) */
        std::vector<size_t> neuron_numbers_in_layers = { 1, 3, 3, 1 };

        /* for each valve (1 in this example) setup the times of change */
        std::vector<std::vector<double>> t;
        t.push_back({0});

        /* for each valve (1 in this example) setup the magnitudes of change */
        std::vector<std::vector<double>> xi;
        xi.push_back({ds1.get_data()->at(0).second});

        /* The simulator2 object */
        l4n::Simulator sim(outputs.size(), neuron_numbers_in_layers, t, xi);

        /* Error function */
        l4n::MSE mse1(&sim, &ds1);  // First parameter - neural network, second parameter - data-set

        /* Particle Swarm method domain*/
        std::vector<double> domain_bounds(2 * (sim.get_n_weights() + sim.get_n_biases()));
        for (size_t i = 0; i < domain_bounds.size() / 2; ++i) {
            domain_bounds[2 * i] = -0.1;
            domain_bounds[2 * i + 1] = 0.1;
        }

        l4n::RandomSolution rnd;
        l4n::LevenbergMarquardt leven(max_n_iters_gradient_lm, batch_size, prec_lm );
        l4n::LearningSequence learning_sequence( 1e-6, max_number_of_cycles );
        learning_sequence.add_learning_method( &rnd );
        learning_sequence.add_learning_method( &leven );

        /* Weight and bias randomization in the network accordingly to the uniform distribution */
        sim.randomize_parameters();

        /* Complex Optimization */
        learning_sequence.optimize(mse1);  // Network training

        /* Save Neural network parameters to file */
        sim.save_text("test_net_Gradient_Descent.4n");

        /* PHASE 4 - TESTING DATA */

//        /* Output file specification */
        std::string filename = "simulator_output.txt";
        std::ofstream output_file(filename);
        if (!output_file.is_open()) {
            throw std::runtime_error("File '" + filename + "' can't be opened!");
        }
//
//        /* Neural network loading */
        l4n::NeuralNetwork nn3("test_net_Gradient_Descent.4n");

        /* Check of the saved network - write to the file */
        output_file << std::endl << "The loaded network info:" << std::endl;
        nn3.write_stats(&output_file);
        nn3.write_weights(&output_file);
        nn3.write_biases(&output_file);
//
//        /* Evaluate network on an arbitrary data-set and save results into the file */
        l4n::CSVReader reader3("../../../data_files/data_BACK_RH_1.csv", ";", true);  // File, separator, skip 1st line
        reader3.read();  // Read from the file
//
//        /* Create data set for both the testing of the neural network */
//        /* Specify which columns are inputs or outputs */
//
        l4n::DataSet ds3 = reader3.get_data_set(&inputs, &outputs);  // Creation of data-set for NN
        if(normalize_data){
            ds3.normalize();  // Normalization of data to prevent numerical problems
        }
//
//        output_file << std::endl << "Evaluating network on the dataset: " << std::endl;
//        ds3.store_data_text(&output_file);
//
        output_file << "Output and the error:" << std::endl;
//
//        /* Error function */
        l4n::MSE mse3(&nn3, &ds3);  // First parameter - neural network, second parameter - data-set

        mse3.eval_on_data_set(&ds3, &output_file, nullptr, normalize_data, true);

        /* Close the output file for writing */
        output_file.close();

        return 0;

    }
    catch (const std::exception& e) {
        std::cerr << e.what() << std::endl;
        exit(EXIT_FAILURE);
    }

}