use bevy::{prelude::*, window::PresentMode, render::camera::CameraProjectionPlugin};
// use offaxis::{offaxis_camera_setup, OffAxisProjection};


#[derive(Component,Default)]
pub struct Viewer {
    pub position: Vec3,
    pub orientation: Quat,

    pub alpha: f32,
}

impl Viewer {

    pub fn new(position: Vec3) ->Self {
        Self {
            position,
            orientation: Quat::IDENTITY,
            alpha: 0.0,

        }
    }

    pub fn default() -> Self {
        Self {
            position: Vec3::ZERO,
            orientation: Quat::IDENTITY,
            alpha: 0.0
        }
    }
}

pub fn simulate_viewer(mut query: Query<&mut Viewer>)
{
    for mut v  in query.iter_mut() {
        //v.position += Vec3::Y * 0.005;
        v.alpha += 0.01;
        let radius = 1.5;
        v.position = Vec3::new(v.alpha.sin()*radius,v.alpha.cos()*radius + 1.0_f32,15.0);

        let vm = Mat4::look_at_rh(v.position, Vec3::ZERO, Vec3::Y);

        println!("{:?}",vm);

        // view matrices should be orientation only
        let dir = Quat::from_mat4(&vm);

        v.orientation = dir;

    }
}