/*!
 * \file channel.h
 * \brief Interface of a GNSS channel.
 * \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
 *         Luis Esteve, 2011. luis(at)epsilon-formacion.com
 *
 * It holds blocks for acquisition, tracking,
 * navigation data extraction and pseudorange calculation.
 *
 * -------------------------------------------------------------------------
 *
 * Copyright (C) 2010-2018  (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 <https://www.gnu.org/licenses/>.
 *
 * -------------------------------------------------------------------------
 */

#ifndef GNSS_SDR_CHANNEL_H_
#define GNSS_SDR_CHANNEL_H_

#include "channel_interface.h"
#include "channel_fsm.h"
#include "gnss_synchro.h"
#include "channel_msg_receiver_cc.h"
#include <gnuradio/msg_queue.h>
#include <gnuradio/block.h>
#include <memory>
#include <string>
#include <mutex>

class ConfigurationInterface;
class AcquisitionInterface;
class TrackingInterface;
class TelemetryDecoderInterface;

/*!
 * \brief This class represents a GNSS channel. It wraps an AcquisitionInterface,
 * a Tracking Interface and a TelemetryDecoderInterface, and handles
 * their interaction through a Finite State Machine
 *
 */
class Channel : public ChannelInterface
{
public:
    //! Constructor
    Channel(ConfigurationInterface* configuration, unsigned int channel,
        std::shared_ptr<GNSSBlockInterface> pass_through, std::shared_ptr<AcquisitionInterface> acq,
        std::shared_ptr<TrackingInterface> trk, std::shared_ptr<TelemetryDecoderInterface> nav,
        std::string role, std::string implementation, gr::msg_queue::sptr queue);
    //! Virtual destructor
    virtual ~Channel();

    void connect(gr::top_block_sptr top_block) override;
    void disconnect(gr::top_block_sptr top_block) override;
    gr::basic_block_sptr get_left_block() override;
    gr::basic_block_sptr get_right_block() override;

    inline std::string role() override { return role_; }

    //! Returns "Channel"
    inline std::string implementation() override { return implementation_; }

    inline size_t item_size() override { return 0; }

    inline Gnss_Signal get_signal() const override { return gnss_signal_; }

    void start_acquisition() override;                          //!< Start the State Machine
    void set_signal(const Gnss_Signal& gnss_signal_) override;  //!< Sets the channel GNSS signal

    inline std::shared_ptr<AcquisitionInterface> acquisition() { return acq_; }
    inline std::shared_ptr<TrackingInterface> tracking() { return trk_; }
    inline std::shared_ptr<TelemetryDecoderInterface> telemetry() { return nav_; }

    void msg_handler_events(pmt::pmt_t msg);

private:
    channel_msg_receiver_cc_sptr channel_msg_rx;
    std::shared_ptr<GNSSBlockInterface> pass_through_;
    std::shared_ptr<AcquisitionInterface> acq_;
    std::shared_ptr<TrackingInterface> trk_;
    std::shared_ptr<TelemetryDecoderInterface> nav_;
    std::string role_;
    std::string implementation_;
    bool flag_enable_fpga;
    unsigned int channel_;
    Gnss_Synchro gnss_synchro_;
    Gnss_Signal gnss_signal_;
    bool connected_;
    bool repeat_;
    std::shared_ptr<ChannelFsm> channel_fsm_;
    gr::msg_queue::sptr queue_;
    std::mutex mx;
};

#endif /*GNSS_SDR_CHANNEL_H_*/
