//! Keep track of the time we spent in each part of the game loop.
use std::time::Instant;

/// Utility struct.
/// Keeps track of the time we spent in each part of the game loop.
pub struct Timing {
	timer: Option<Instant>,

	/// The time we spent simulating game state
	pub galaxy: f32,

	/// The time we spent simulating physics
	pub physics: f32,
}

impl Timing {
	/// Create a new timing struct
	pub fn new() -> Self {
		Self {
			timer: None,
			galaxy: f32::NAN,
			physics: f32::NAN,
		}
	}

	/// Start the timer
	pub fn start(&mut self) {
		self.timer = Some(Instant::now());
	}

	/// Clear timer and record galaxy simulation time.
	/// Assumes timer has been started
	pub fn mark_galaxy(&mut self) {
		self.galaxy = self.timer.unwrap().elapsed().as_secs_f32();
		self.timer = None;
	}

	/// Clear timer and record physics simulation time
	/// Asumes timer has been started
	pub fn mark_physics(&mut self) {
		self.physics = self.timer.unwrap().elapsed().as_secs_f32();
		self.timer = None;
	}
}