// -*- coding: utf-8 -*-
//
// Copyright 2021 Michael Büsch <m@bues.ch>
//
// Licensed under the Apache License version 2.0
// or the MIT license, at your option.
// SPDX-License-Identifier: Apache-2.0 OR MIT
//

use crate::base::PhyType;
use crate::vector::Vector;
use crate::world::WorldContext;
use std::cmp::max;

pub trait Brake {
    fn apply_brake(&self, context: &WorldContext, mut speed: Vector) -> Vector {
        let brake_decel = self.get_brake_deceleration(speed);
        let speed_dec = brake_decel * context.period_sec();
        let new_speed = max(speed.length() - speed_dec, 0.into());
        speed.set_length(new_speed);
        speed
    }

    fn get_brake_deceleration(&self, speed: Vector) -> PhyType;
}

// vim: ts=4 sw=4 expandtab