class Clock {
	autoStart: boolean
	startTime: number
	oldTime: number
	elapsedTime: number
	running: boolean
	constructor(autoStart: boolean = true) {
		this.autoStart = autoStart;

		this.startTime = 0;
		this.oldTime = 0;
		this.elapsedTime = 0;

		this.running = false;
	}
	start() {

		this.startTime = (typeof performance === 'undefined' ? Date : performance).now(); // see #10732

		this.oldTime = this.startTime;
		this.elapsedTime = 0;
		this.running = true;

	}

	stop() {

		this.getElapsedTime();
		this.running = false;
		this.autoStart = false;

	}

	getElapsedTime() {

		this.getDelta();
		return this.elapsedTime;

	}

	getDelta() {

		var diff = 0;

		if (this.autoStart && !this.running) {

			this.start();
			return 0;

		}

		if (this.running) {

			var newTime = (typeof performance === 'undefined' ? Date : performance).now();

			diff = (newTime - this.oldTime) / 1000;
			this.oldTime = newTime;

			this.elapsedTime += diff;

		}

		return diff;

	}
}


export { Clock };