// 格式化工具函数

/**
 * 格式化日期 YYYY-MM-DD
 */
export function formatDate(dateStr: string | Date | null | undefined): string {
  if (!dateStr) return '-';
  const d = new Date(dateStr);
  if (isNaN(d.getTime())) return String(dateStr);
  const year = d.getFullYear();
  const month = String(d.getMonth() + 1).padStart(2, '0');
  const day = String(d.getDate()).padStart(2, '0');
  return `${year}-${month}-${day}`;
}

/**
 * 格式化日期时间 YYYY-MM-DD HH:mm
 */
export function formatDateTime(dateStr: string | Date | null | undefined): string {
  if (!dateStr) return '-';
  const d = new Date(dateStr);
  if (isNaN(d.getTime())) return String(dateStr);
  const year = d.getFullYear();
  const month = String(d.getMonth() + 1).padStart(2, '0');
  const day = String(d.getDate()).padStart(2, '0');
  const hour = String(d.getHours()).padStart(2, '0');
  const minute = String(d.getMinutes()).padStart(2, '0');
  return `${year}-${month}-${day} ${hour}:${minute}`;
}

/**
 * 格式化金额(带千分位分隔符,保留2位小数)
 */
export function formatMoney(amount: number | null | undefined): string {
  if (amount == null || isNaN(amount)) return '0.00';
  return Number(amount).toLocaleString('zh-CN', {
    minimumFractionDigits: 2,
    maximumFractionDigits: 2
  });
}

/**
 * 格式化数量(带千分位分隔符,无小数)
 */
export function formatNumber(num: number | null | undefined): string {
  if (num == null || isNaN(num)) return '0';
  return Number(num).toLocaleString('zh-CN');
}

/**
 * 格式化百分比
 */
export function formatPercent(value: number, total: number): string {
  if (total === 0) return '0%';
  const percent = (value / total) * 100;
  return `${percent.toFixed(1)}%`;
}