// 日期格式化工具
export const dateUtils = {
  // 格式化日期
  formatDate: (date: Date | string, format = 'YYYY-MM-DD'): string => {
    const d = new Date(date);

    if (isNaN(d.getTime())) {
      return '';
    }

    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);
  },

  // 获取相对时间（如：2小时前）
  getRelativeTime: (date: Date | string): string => {
    const now = new Date();
    const target = new Date(date);
    const diffMs = now.getTime() - target.getTime();

    // 如果目标时间在未来，返回绝对时间
    if (diffMs < 0) {
      return dateUtils.formatDate(target, 'YYYY-MM-DD HH:mm');
    }

    const diffSeconds = Math.floor(diffMs / 1000);
    const diffMinutes = Math.floor(diffSeconds / 60);
    const diffHours = Math.floor(diffMinutes / 60);
    const diffDays = Math.floor(diffHours / 24);
    const diffWeeks = Math.floor(diffDays / 7);
    const diffMonths = Math.floor(diffDays / 30);
    const diffYears = Math.floor(diffDays / 365);

    if (diffSeconds < 60) {
      return '刚刚';
    } else if (diffMinutes < 60) {
      return `${diffMinutes}分钟前`;
    } else if (diffHours < 24) {
      return `${diffHours}小时前`;
    } else if (diffDays < 7) {
      return `${diffDays}天前`;
    } else if (diffWeeks < 4) {
      return `${diffWeeks}周前`;
    } else if (diffMonths < 12) {
      return `${diffMonths}个月前`;
    } else {
      return `${diffYears}年前`;
    }
  },

  // 检查是否是今天
  isToday: (date: Date | string): boolean => {
    const today = new Date();
    const target = new Date(date);

    return today.getFullYear() === target.getFullYear() &&
           today.getMonth() === target.getMonth() &&
           today.getDate() === target.getDate();
  },

  // 检查是否是昨天
  isYesterday: (date: Date | string): boolean => {
    const yesterday = new Date();
    yesterday.setDate(yesterday.getDate() - 1);
    const target = new Date(date);

    return yesterday.getFullYear() === target.getFullYear() &&
           yesterday.getMonth() === target.getMonth() &&
           yesterday.getDate() === target.getDate();
  }
};