export type BillingCatalogTier = 'pro' | 'pro_plus'
/** 웹 결제는 Payple(KRW) 하나다. 모바일은 Google Play 스토어 가격을 쓰고 이 카탈로그에 오지 않는다. */
export type BillingCatalogProvider = 'payple'

export interface BillingCatalogPrice {
  provider: BillingCatalogProvider
  unit_amount: number
  currency: string
  interval: 'day' | 'week' | 'month' | 'year'
  interval_count: number
}

export interface BillingCatalogPlan {
  tier: BillingCatalogTier
  prices: BillingCatalogPrice[]
}

export interface BillingCatalogResponse {
  schema_version: '1'
  plans: BillingCatalogPlan[]
}

export function createBillingCatalog(input: {
  payple?: Record<BillingCatalogTier, number> | null
}): BillingCatalogResponse {
  const tiers: BillingCatalogTier[] = ['pro', 'pro_plus']
  return {
    schema_version: '1',
    plans: tiers.map((tier) => {
      const prices: BillingCatalogPrice[] = []
      const paypleAmount = input.payple?.[tier]
      if (Number.isSafeInteger(paypleAmount) && (paypleAmount as number) > 0) {
        prices.push({
          provider: 'payple',
          unit_amount: paypleAmount as number,
          currency: 'KRW',
          interval: 'month',
          interval_count: 1,
        })
      }
      return { tier, prices }
    }),
  }
}