// utils/dateUtils.js

/**
 * 智能时间格式化：返回 "今天 18:00"、"昨天 18:00" 等
 */
export function formatSmartTime(timeStr) {
  if (!timeStr) return '未知';

  // iOS兼容格式
  const safeStr = timeStr.replace(' ', 'T');
  const inputDate = new Date(safeStr);
  if (isNaN(inputDate.getTime())) return '时间格式错误';

  const now = new Date();
  const inputDayStart = new Date(inputDate.getFullYear(), inputDate.getMonth(), inputDate.getDate());
  const nowDayStart = new Date(now.getFullYear(), now.getMonth(), now.getDate());

  const diffTime = nowDayStart - inputDayStart;
  const oneDay = 1000 * 60 * 60 * 24;

  const timePart = inputDate.toTimeString().slice(0, 5); // HH:mm

  if (diffTime === 0) {
    return `今天 ${timePart}`;
  } else if (diffTime === oneDay) {
    return `昨天 ${timePart}`;
  } else if (diffTime === oneDay * 2) {
    return `前天 ${timePart}`;
  } else {
    return `${inputDate.getMonth() + 1}月${inputDate.getDate()}日 ${timePart}`;
  }
}

/**
 * 相对时间格式化：返回 "刚刚更新"、"5分钟前更新"、"3天前更新" 等
 */
export function formatDate(dateStr) {
  if (!dateStr) return '未知';

  const parsedStr = dateStr.replace(' ', 'T');
  const date = new Date(parsedStr);
  if (isNaN(date.getTime())) return '无效时间';

  const now = new Date();
  const diff = Math.floor((now - date) / 1000 / 60); // 单位：分钟

  if (diff < 1) return '刚刚更新';
  if (diff < 5) return '1分钟前更新';
  if (diff < 10) return '5分钟前更新';
  if (diff < 60) return `${diff}分钟前更新`;

  if (diff < 120) return '1小时前更新';
  if (diff < 24 * 60) return `${Math.floor(diff / 60)}小时前更新`;
  if (diff < 7 * 24 * 60) return `${Math.floor(diff / (60 * 24))}天前更新`;

  return parsedStr.split('T')[0] + ' 更新';
}

export function getFormattedTime() {
  const now = new Date();
  const pad = n => n < 10 ? '0' + n : n;

  const year = now.getFullYear();
  const month = pad(now.getMonth() + 1);
  const day = pad(now.getDate());

  const hours = pad(now.getHours());
  const minutes = pad(now.getMinutes());
  const seconds = pad(now.getSeconds());

  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
}