/**
 * 自动结算倒计时展示（只信服务端字段，不自行用配置小时推算）
 * 有 auto_settle_eligible + auto_expire_at 才展示。
 */

export function formatRemainText(remainSeconds) {
  const s = Math.max(0, Number(remainSeconds) || 0);
  const h = Math.floor(s / 3600);
  const m = Math.floor((s % 3600) / 60);
  if (h >= 24) {
    const d = Math.floor(h / 24);
    const rh = h % 24;
    return `${d}天${rh}小时`;
  }
  if (h > 0) return `${h}小时${m}分`;
  if (m > 0) return `${m}分钟`;
  return s > 0 ? `${s}秒` : '即将结算';
}

/**
 * 把接口字段整理成前端展示用；不可展示时返回 null。
 */
export function buildAutoSettleDisplay(item, nowMs) {
  if (!item || !item.auto_settle_eligible) return null;
  if (!item.auto_expire_at) return null;
  if (Number(item.zhuangtai) !== 8) return null;

  let remain = item.auto_settle_remain_seconds;
  if (remain == null || remain === '') {
    const t = Date.parse(String(item.auto_expire_at).replace(/-/g, '/'));
    if (!Number.isFinite(t)) return null;
    remain = Math.floor((t - (nowMs || Date.now())) / 1000);
  } else {
    remain = Number(remain);
  }
  if (!Number.isFinite(remain)) return null;

  return {
    eligible: true,
    expireAt: item.auto_expire_at,
    remainSeconds: Math.max(0, remain),
    remainText: formatRemainText(remain),
    tip: remain <= 0 ? '即将自动结算' : `预计自动结算 ${formatRemainText(remain)}`,
  };
}

export function attachAutoSettleFields(item) {
  const disp = buildAutoSettleDisplay(item);
  if (!disp) {
    return { ...item, autoSettleTip: '', autoSettleExpireAt: '' };
  }
  return {
    ...item,
    autoSettleTip: disp.tip,
    autoSettleExpireAt: disp.expireAt,
    autoSettleRemainText: disp.remainText,
  };
}