const UNIX_MILLISECONDS_THRESHOLD = 1_000_000_000_000;

export function normalizeChatTimestamp(timestamp: number): number {

return Math.abs(timestamp) < UNIX_MILLISECONDS_THRESHOLD ? timestamp * 1000 : timestamp;

}

function pad2(value: number): string {

return String(value).padStart(2, '0');

}

function formatTime(date: Date): string {

return `${pad2(date.getHours())}:${pad2(date.getMinutes())}:${pad2(date.getSeconds())}`;

}

function formatDate(date: Date): string {

return `${date.getFullYear()}-${pad2(date.getMonth() + 1)}-${pad2(date.getDate())}`;

}

function isSameLocalDate(left: Date, right: Date): boolean {

return left.getFullYear() === right.getFullYear()

&& left.getMonth() === right.getMonth()

&& left.getDate() === right.getDate();

}

export function formatChatTime(timestamp: number, nowTimestamp: number = Date.now()): string {

const date = new Date(normalizeChatTimestamp(timestamp));

const now = new Date(normalizeChatTimestamp(nowTimestamp));

const time = formatTime(date);

if (isSameLocalDate(date, now)) {

return time;

}

return `${formatDate(date)} ${time}`;

}