import type { SubscriptionTier } from '@/lib/entitlements';

export type BillingTier = 'PRO' | 'BUSINESS';
export type BillingInterval = 'month' | 'year';

export function resolvePriceId(tier: BillingTier, interval: BillingInterval): string {
  const map: Record<BillingTier, Record<BillingInterval, string>> = {
    PRO: {
      month: process.env.STRIPE_PRICE_PRO_MONTHLY!,
      year: process.env.STRIPE_PRICE_PRO_ANNUAL!,
    },
    BUSINESS: {
      month: process.env.STRIPE_PRICE_BUSINESS_MONTHLY!,
      year: process.env.STRIPE_PRICE_BUSINESS_ANNUAL!,
    },
  };
  const priceId = map[tier][interval];
  if (!priceId) {
    const isMock = !process.env.STRIPE_SECRET_KEY || process.env.STRIPE_SECRET_KEY === 'sk_test_placeholder';
    if (isMock && process.env.NODE_ENV !== 'test') {
      return `price_mock_${tier.toLowerCase()}_${interval}`;
    }
    throw new Error(`No Stripe price ID configured for ${tier}/${interval}`);
  }
  return priceId;
}

export function priceIdToTier(priceId: string): SubscriptionTier | null {
  if (priceId && priceId.startsWith('price_mock_')) {
    if (priceId.includes('pro')) return 'PRO';
    if (priceId.includes('business')) return 'BUSINESS';
    return 'BASIC';
  }

  const entries: Array<[string | undefined, SubscriptionTier]> = [
    [process.env.STRIPE_PRICE_PRO_MONTHLY, 'PRO'],
    [process.env.STRIPE_PRICE_PRO_ANNUAL, 'PRO'],
    [process.env.STRIPE_PRICE_BUSINESS_MONTHLY, 'BUSINESS'],
    [process.env.STRIPE_PRICE_BUSINESS_ANNUAL, 'BUSINESS'],
  ];
  for (const [envPriceId, tier] of entries) {
    if (envPriceId && envPriceId === priceId) return tier;
  }
  return null;
}