export class CountdownTimer {
    private _timerID = -1;
    start(seconds: number, onUpdate: (left: number) => void, interval = 1) {
        this.stop();
        if (seconds <= 0) return;

        const end_ts = Date.now() + seconds * 1000;
        const update = () => {
            const left = Math.floor((end_ts - Date.now()) / 1000);
            onUpdate && onUpdate(left);
        }
        this._timerID = setInterval(update, interval * 1000);
        update();
    }

    stop() {
        if (this._timerID > -1) {
            clearInterval(this._timerID);
        }
        this._timerID = -1;
    }
}

export function formatTimes(seconds: number): string {
    const totalSeconds = Number.isFinite(seconds) ? Math.max(0, Math.floor(seconds)) : 0;
    const days = Math.floor(totalSeconds / 86_400);
    const hours = Math.floor((totalSeconds % 86_400) / 3_600);
    const minutes = Math.floor((totalSeconds % 3_600) / 60);
    const remainingSeconds = totalSeconds % 60;
    const pad = (value: number) => value.toString().padStart(2, '0');

    return `${days}D ${pad(hours)}:${pad(minutes)}:${pad(remainingSeconds)}`;
}