/*!
 * \file true_observables_reader.cc
 * \brief Helper file for unit testing
 * \author Javier Arribas, 2017. jarribas(at)cttc.es
 *
 * -------------------------------------------------------------------------
 *
 * Copyright (C) 2010-2017  (see AUTHORS file for a list of contributors)
 *
 * GNSS-SDR is a software defined Global Navigation
 *          Satellite Systems receiver
 *
 * This file is part of GNSS-SDR.
 *
 * GNSS-SDR is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GNSS-SDR is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
 *
 * -------------------------------------------------------------------------
 */

#include "true_observables_reader.h"

bool true_observables_reader::read_binary_obs()
{
    try
    {
        for(int i=0;i<12;i++)
        {
            d_dump_file.read((char *) &gps_time_sec[i], sizeof(double));
            d_dump_file.read((char *) &doppler_l1_hz, sizeof(double));
            d_dump_file.read((char *) &acc_carrier_phase_l1_cycles[i], sizeof(double));
            d_dump_file.read((char *) &dist_m[i], sizeof(double));
            d_dump_file.read((char *) &true_dist_m[i], sizeof(double));
            d_dump_file.read((char *) &carrier_phase_l1_cycles[i], sizeof(double));
            d_dump_file.read((char *) &prn[i], sizeof(double));
        }
    }
    catch (const std::ifstream::failure &e)
    {
            return false;
    }
    return true;
}

bool true_observables_reader::restart()
{
    if (d_dump_file.is_open())
        {
            d_dump_file.clear();
            d_dump_file.seekg(0, std::ios::beg);
            return true;
        }
    else
        {
            return false;
        }
}

long int true_observables_reader::num_epochs()
{
    std::ifstream::pos_type size;
    int number_of_vars_in_epoch = 6*12;
    int epoch_size_bytes = sizeof(double) * number_of_vars_in_epoch;
    std::ifstream tmpfile( d_dump_filename.c_str(), std::ios::binary | std::ios::ate);
    if (tmpfile.is_open())
        {
            size = tmpfile.tellg();
            long int nepoch = size / epoch_size_bytes;
            return nepoch;
        }
    else
        {
            return 0;
        }
}

bool true_observables_reader::open_obs_file(std::string out_file)
{
    if (d_dump_file.is_open() == false)
        {
            try
            {
                    d_dump_filename=out_file;
                    d_dump_file.exceptions ( std::ifstream::failbit | std::ifstream::badbit );
                    d_dump_file.open(d_dump_filename.c_str(), std::ios::in | std::ios::binary);
                    std::cout << "True observables Log file opened: " << d_dump_filename.c_str() << std::endl;
                    return true;
            }
            catch (const std::ifstream::failure & e)
            {
                    std::cout << "Problem opening True observables Log file: " << d_dump_filename.c_str() << std::endl;
                    return false;
            }
        }
    else
        {
            return false;
        }
}

true_observables_reader::~true_observables_reader()
{
    if (d_dump_file.is_open() == true)
        {
            d_dump_file.close();
        }
}