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//  A gearbox for the drivetrain.

//

//  Copyright (C) 2001-2019 Sam Varner

//

//  This file is part of Vamos Automotive Simulator.

//

//  Vamos 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.

//

//  Vamos 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 Vamos.  If not, see <http://www.gnu.org/licenses/>.



#ifndef _TRANSMISSION_H_

#define _TRANSMISSION_H_



#include <map>

#include <vector>



namespace Vamos_Body

{

/// A gearbox for the drivetrain.

class Transmission

{

public:

    /// Let the program calulate equally-spaced

    Transmission(int forward_gears, double first_ratio, double last_ratio);

    Transmission(const std::vector<std::pair<int, double>>& gears);



    /// Shift to a particular gear.

    void shift(int gear);

    /// @return The ratio for a gear.

    double get_gear_ratio(int gear) const;

    /// @return the torque on the driveshaft due to friction at the clutch.

    double get_torque(double drag) const;

    /// @return the current gear.

    int get_gear() const;

    /// @return the number of consecutive forward gears.

    int num_forward_gears() const;

    /// @return the number of consecutive reverse gears.

    int num_reverse_gears() const;

    /// Tell the transmission what the rotational speed of the driveshaft is.

    void set_driveshaft_speed(double speed);

    /// @return the rotational speed at the clutch side of the transmission.

    double get_clutch_speed() const;



    /// A map of gears to gear ratios.  Neutral has a key of 0.  Reverse gears have

    /// negative keys.

    std::map<int, double> m_gear_ratios;

    /// The current gear.

    int m_gear = 0;

    /// The number of consecutive forward gears.

    int m_forward_gears;

    /// The number of consecutive reverse gears.

    int m_reverse_gears;

    /// The rotational speed at the clutch side of the transmission.

    double m_clutch_speed = 0.0;

};

} // namespace Vamos_Body



#endif // not _TRANSMISSION_H_