// 日期格式化
export function formatDate(date: Date | string, format = 'YYYY-MM-DD'): string {
  const d = typeof date === 'string' ? new Date(date) : date;
  const year = d.getFullYear();
  const month = String(d.getMonth() + 1).padStart(2, '0');
  const day = String(d.getDate()).padStart(2, '0');
  const hours = String(d.getHours()).padStart(2, '0');
  const minutes = String(d.getMinutes()).padStart(2, '0');
  const seconds = String(d.getSeconds()).padStart(2, '0');

  return format
    .replace('YYYY', String(year))
    .replace('MM', month)
    .replace('DD', day)
    .replace('HH', hours)
    .replace('mm', minutes)
    .replace('ss', seconds);
}

// 延迟函数
export function delay(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

// 生成随机 ID
export function generateId(length = 12): string {
  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  let result = '';
  for (let i = 0; i < length; i++) {
    result += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return result;
}

// 深拷贝
export function deepClone<T>(obj: T): T {
  if (obj === null || typeof obj !== 'object') {
    return obj;
  }
  return JSON.parse(JSON.stringify(obj));
}

// 判断是否为空对象
export function isEmpty(obj: unknown): boolean {
  if (obj === null || obj === undefined) return true;
  if (typeof obj === 'string') return obj.trim().length === 0;
  if (Array.isArray(obj)) return obj.length === 0;
  if (typeof obj === 'object') return Object.keys(obj).length === 0;
  return false;
}

// 安全解析 JSON
export function safeJsonParse<T>(json: string, fallback: T): T {
  try {
    return JSON.parse(json) as T;
  } catch {
    return fallback;
  }
}

// 首字母大写
export function capitalize(str: string): string {
  if (!str) return '';
  return str.charAt(0).toUpperCase() + str.slice(1);
}

// 驼峰转短横线
export function camelToKebab(str: string): string {
  return str.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase();
}

// 短横线转驼峰
export function kebabToCamel(str: string): string {
  return str.replace(/-([a-z])/g, (_, letter) => letter.toUpperCase());
}