/**
 * Timer utilities for auto-update functionality.
 */

export type TimerCallback = () => void;

let intervalId: ReturnType<typeof setInterval> | null = null;
let timeoutId: ReturnType<typeof setTimeout> | null = null;

/**
 * Start a recurring timer with the given interval and callback.
 * Clears any existing timer first.
 */
export function startTimer(intervalMs: number, callback: TimerCallback, options?: { initialDelayMs?: number }): void {
	stopTimer();

	if (intervalMs <= 0) return;

	const runAndReschedule = (): void => {
		intervalId = setInterval(callback, intervalMs);
		callback();
	};

	const initialDelayMs = options?.initialDelayMs ?? 0;
	if (initialDelayMs <= 0) {
		runAndReschedule();
		return;
	}

	timeoutId = setTimeout(() => {
		timeoutId = null;
		runAndReschedule();
	}, initialDelayMs);
}

/**
 * Stop the current timer if running.
 */
export function stopTimer(): void {
	if (timeoutId) {
		clearTimeout(timeoutId);
		timeoutId = null;
	}

	if (intervalId) {
		clearInterval(intervalId);
		intervalId = null;
	}
}

/**
 * Check if a timer is currently running.
 */
export function isTimerRunning(): boolean {
	return timeoutId !== null || intervalId !== null;
}