use crate::components::{Movable, Position};

use sdl2::keyboard as sdl;

pub struct Move {
    pub keycode: sdl::Keycode,
}

impl<'a> specs::System<'a> for Move {
    type SystemData = (
        specs::ReadStorage<'a, Movable>,
        specs::WriteStorage<'a, Position>,
    );

    fn run(&mut self, (movable, mut position): Self::SystemData) {
        use specs::Join;

        for (_, pos) in (&movable, &mut position).join() {
            match self.keycode {
                sdl::Keycode::W => pos.y -= 1.0,
                sdl::Keycode::A => pos.x -= 1.0,
                sdl::Keycode::S => pos.y += 1.0,
                sdl::Keycode::D => pos.x += 1.0,
                _ => (),
            }
        }
    }
}