/*!
 * \file cpu_multicorrelator.h
 * \brief High optimized CPU vector multiTAP correlator class
 * \authors <ul>
 *          <li> Javier Arribas, 2015. jarribas(at)cttc.es
 *          </ul>
 *
 * Class that implements a high optimized vector multiTAP correlator class for CPUs
 *
 * -------------------------------------------------------------------------
 *
 * Copyright (C) 2010-2015  (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/>.
 *
 * -------------------------------------------------------------------------
 */

#ifndef GNSS_SDR_CPU_MULTICORRELATOR_H_
#define GNSS_SDR_CPU_MULTICORRELATOR_H_

#include <complex>

/*!
 * \brief Class that implements carrier wipe-off and correlators.
 */
class cpu_multicorrelator
{
public:
    cpu_multicorrelator();
    bool init(
            int max_signal_length_samples,
            int n_correlators
    );
    bool set_local_code_and_taps(
            int code_length_chips,
            const std::complex<float>* local_code_in,
            float *shifts_chips
    );
    bool set_input_output_vectors(
    		std::complex<float>* corr_out,
    		const std::complex<float>* sig_in
    		);
    void update_local_code(
    		int correlator_length_samples,
    		float rem_code_phase_chips,
    		float code_phase_step_chips
    );

    void update_local_carrier(
    		int correlator_length_samples,
    		float rem_carr_phase_rad,
    		float phase_step_rad
    );
    bool Carrier_wipeoff_multicorrelator_resampler(
            float rem_carrier_phase_in_rad,
            float phase_step_rad,
            float rem_code_phase_chips,
            float code_phase_step_chips,
            int signal_length_samples);
    bool free();

private:
    // Allocate the device input vectors
    const std::complex<float> *d_sig_in;
    std::complex<float> *d_nco_in;
    std::complex<float> **d_local_codes_resampled;
    std::complex<float> *d_sig_doppler_wiped;
    const std::complex<float> *d_local_code_in;
    std::complex<float> *d_corr_out;

    float *d_shifts_chips;
    int d_code_length_chips;
    int d_n_correlators;

    bool update_local_code();
    bool update_local_carrier();

};


#endif /* CPU_MULTICORRELATOR_H_ */