lib/utils/format-utils.ts

/**
 * Formatting utilities for time and dates
 */

/**
 * Format seconds to HH:MM:SS or MM:SS
 */
export function formatTime(seconds: number): string {
    const hours = Math.floor(seconds / 3600);
    const minutes = Math.floor((seconds % 3600) / 60);
    const secs = Math.floor(seconds % 60);

    if (hours > 0) {
        return `${hours}:${minutes.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}`;
    }
    return `${minutes}:${secs.toString().padStart(2, '0')}`;
}

/**
 * Format timestamp to relative date (今天, 昨天, X天前, or date)
 */
export function formatDate(ts: number): string {
    const date = new Date(ts);
    const now = new Date();
    const diff = now.getTime() - date.getTime();
    const days = Math.floor(diff / (1000 * 60 * 60 * 24));

    if (days === 0) return '今天';
    if (days === 1) return '昨天';
    if (days < 7) return `${days}天前`;

    return date.toLocaleDateString('zh-CN', { month: 'short', day: 'numeric' });
}