/*
 * Copyright (C) Oscar Shrimpton 2020
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

use stockton_input::{Axis, InputManager};
use stockton_types::components::Transform;
use stockton_types::Vector3;

use crate::delta_time::Timing;

pub trait FlycamInput {
    fn get_x_axis(&self) -> &Axis;
    fn get_y_axis(&self) -> &Axis;
    fn get_z_axis(&self) -> &Axis;
}

pub struct FlycamControlled {
    pub speed: f32,
}

#[system(for_each)]
pub fn flycam_move<T>(
    #[resource] manager: &T,
    #[resource] timing: &Timing,
    transform: &mut Transform,
    flycam: &FlycamControlled,
) where
    T: 'static + InputManager,
    T::Inputs: FlycamInput,
{
    // TODO: Deal with looking around

    let inputs = manager.get_inputs();
    let speed = flycam.speed;
    let impulse = Vector3::new(
        **inputs.get_x_axis() as f32 * speed * timing.delta_time,
        **inputs.get_y_axis() as f32 * speed * timing.delta_time,
        **inputs.get_z_axis() as f32 * speed * timing.delta_time,
    );

    transform.position += impulse;
}