module gameengine.core.engine;

import gameengine.graphics.drawable;
import gameengine.renderer.renderer;
import gameengine.node.node;
import std.datetime.stopwatch;

import std.stdio;
import std.format;

class Engine {
	this(Renderer renderer) {
		this.renderer = renderer;
		previousProcessTick = 0.00001f;
		previousPhysicsProcessTick = 0.00001f;

		watch.start();
	}

	~this() {
		watch.stop();
	}

	void runNodeProcesses() {
		// TODO: fix delta then adapt for runNodePhysicsProcesses
		float current = watch.peek.total!"msecs" / 1_000;
		float delta = (current - previousProcessTick);

		foreach (Node* node ; nodeList) {
			node.process(delta);
		}

		this.previousProcessTick = watch.peek.total!"msecs" / 1_000;
	}

	void runNodePhysicsProcesses() {
		// Schade!
		float current = watch.peek.total!"msecs" / 1_000;
		float delta = (current - previousProcessTick);

		foreach (Node* node ; nodeList) {
			node.physicsProcess(delta);
		}

		this.previousPhysicsProcessTick = watch.peek.total!"msecs" / 1_000;
	}

	void drawNodes() {
		foreach (Node* node; nodeList) {
			if (Drawable* drawNode = cast(Drawable*) node) {
				drawNode.draw(&renderer);
			}
		}
	}

	string engineVersion() const { return "0.0.0"; }

	private Renderer renderer;
	private StopWatch watch;
	private float previousProcessTick;
	private float previousPhysicsProcessTick;

	private Node*[] nodeList;
}