import dayjs from 'dayjs';
import relativeTime from 'dayjs/plugin/relativeTime';
import 'dayjs/locale/zh-cn';

// 配置 dayjs
dayjs.extend(relativeTime);
dayjs.locale('zh-cn');

/**
 * 格式化数字，添加千位分隔符
 */
export function formatNumber(num: number | string, decimals = 0): string {
  const n = typeof num === 'string' ? parseFloat(num) : num;
  if (isNaN(n)) return '0';
  return n.toLocaleString('zh-CN', {
    minimumFractionDigits: decimals,
    maximumFractionDigits: decimals,
  });
}

/**
 * 格式化货币
 */
export function formatCurrency(amount: number, currency = 'CNY'): string {
  const symbols: Record<string, string> = {
    CNY: '¥',
    USD: '$',
    USDT: '积分 ',
    BTC: 'BTC ',
  };
  const symbol = symbols[currency] || '';
  return `${symbol}${formatNumber(amount, 2)}`;
}

/**
 * 格式化百分比
 */
export function formatPercentage(value: number, decimals = 1): string {
  return `${value >= 0 ? '+' : ''}${value.toFixed(decimals)}%`;
}

/**
 * 格式化日期
 * dayjs 会自动将 UTC 时间转换为本地时间显示
 */
export function formatDate(date: string | Date, format = 'YYYY-MM-DD'): string {
  return dayjs(date).format(format);
}

/**
 * 格式化日期时间
 * dayjs 会自动将 UTC 时间转换为本地时间显示
 */
export function formatDateTime(date: string | Date, format = 'YYYY-MM-DD HH:mm:ss'): string {
  return dayjs(date).format(format);
}

/**
 * 格式化相对时间 (如: 5分钟前, 2小时前)
 * dayjs 会自动将 UTC 时间转换为本地时间计算
 */
export function formatRelativeTime(date: string | Date): string {
  return dayjs(date).fromNow();
}

/**
 * 格式化文件大小
 */
export function formatFileSize(bytes: number): string {
  if (bytes === 0) return '0 B';
  const k = 1024;
  const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  return `${parseFloat((bytes / Math.pow(k, i)).toFixed(2))} ${sizes[i]}`;
}

/**
 * 截断文本
 */
export function truncateText(text: string, maxLength: number): string {
  if (text.length <= maxLength) return text;
  return `${text.slice(0, maxLength)}...`;
}

/**
 * 格式化手机号 (隐藏中间4位)
 */
export function formatPhone(phone: string): string {
  if (!phone || phone.length !== 11) return phone;
  return `${phone.slice(0, 3)}****${phone.slice(7)}`;
}

/**
 * 格式化钱包地址 (显示前后几位)
 */
export function formatWalletAddress(address: string, startLen = 6, endLen = 4): string {
  if (!address || address.length <= startLen + endLen) return address;
  return `${address.slice(0, startLen)}...${address.slice(-endLen)}`;
}

/**
 * 格式化排名显示
 */
export function formatRanking(rank: number | null): string {
  if (rank === null || rank === 0) return '-';
  return `#${rank}`;
}