import type { AdminSubscription, PlanDefinition, UserSubscriptionSummary } from '../../types';

export function formatTokenCount(value: number) {
  return value.toLocaleString('zh-CN');
}

export function formatTokenQuota(limit: number, used: number) {
  if (limit === 0) {
    return `已用 ${formatTokenCount(used)} / 无限`;
  }
  const remaining = Math.max(0, limit - used);
  return `${formatTokenCount(remaining)} / ${formatTokenCount(limit)}（已用 ${formatTokenCount(used)}）`;
}

export function resolvePlanLabel(planType: string, plans: PlanDefinition[]) {
  return plans.find((plan) => plan.planType === planType)?.name ?? planType;
}

export function subscriptionStatusLabel(status: AdminSubscription['status']) {
  if (status === 'active') return '有效';
  if (status === 'expired') return '已到期';
  if (status === 'cancelled') return '已取消';
  return status;
}

export function summarizeSubscription(
  subscription: Pick<UserSubscriptionSummary, 'planType' | 'periodTokensLimit' | 'periodTokensUsed'> | null | undefined,
  fallbackPlanType?: string,
) {
  if (!subscription) {
    return fallbackPlanType && fallbackPlanType !== 'free'
      ? `${fallbackPlanType}（无有效订阅）`
      : '免费 / 无订阅';
  }
  return formatTokenQuota(subscription.periodTokensLimit, subscription.periodTokensUsed);
}