export class TimeKeeper {
	fps: number;
	startedTs: number;
	isPaused: boolean;
	ts: number;
	rate: number;
	skippingFunc: () => boolean;

	constructor(startedTs: number, fps: number, skippingFunc: () => boolean) {
		this.fps = fps;
		this.startedTs = startedTs;
		this.ts = this.startedTs;
		this.isPaused = false;
		this.rate = 2;
		this.skippingFunc = skippingFunc;
	}

	reset(ts: number) {
		this.startedTs = ts;
		this.ts = ts;
	}

	pause() {
		this.isPaused = true;
	}

	resume() {
		this.isPaused = false;
	}

	start() {
		setInterval(() => {
			if (this.isPaused) return;
			if (this.skippingFunc()) return;
			this.ts += (1000 / this.fps) * this.rate;
		}, 1000 / this.fps);
	}

	jump(ts: number) {
		this.ts = ts;
	}

	jumpByFrame(frameNumber: number) {
		this.ts = this.startedTs + frameNumber * (1000 / this.fps);
	}
}