import {z} from 'zod'

export type GetApiSubscriptionsIdBenefitBalancesArgs = {id: string};

export type GetApiSubscriptionsIdBenefitBalancesOptions = {baseUrl?: string | undefined, Bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const subscriptionBenefitBalanceDto = z.object({planBenefitId: z.string().optional(), displayName: z.string().optional(), period: z.string().optional(), periodKey: z.string().optional(), includedQuantity: z.union([z.number(), z.string()]).optional(), used: z.union([z.number(), z.string()]).optional(), remaining: z.union([z.number(), z.string()]).optional()});

export const benefitRedemptionDto = z.object({id: z.string().optional(), planBenefitId: z.string().optional(), displayName: z.string().optional(), quantity: z.union([z.number(), z.string()]).optional(), periodKey: z.string().optional(), redeemedAt: z.string().optional(), invoiceLineItemId: z.string().nullable().optional(), reason: z.string().nullable().optional(), reversedAt: z.string().nullable().optional(), reversalReason: z.string().nullable().optional()});

export const subscriptionBenefitBalancesDto = z.object({subscriptionId: z.string().optional(), asOf: z.string().optional(), balances: z.array(subscriptionBenefitBalanceDto).optional(), recentRedemptions: z.array(benefitRedemptionDto).optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * The subscription's live benefit balances (ITE-653): each plan benefit
 * with used/remaining for the CURRENT period, derived from the redemption
 * ledger via PlanBenefitLedger — the same math the
 * redemption pass (ITE-659) uses, so tracker and billing can't disagree.
 * 
 * GET /Subscriptions/{id}/benefit-balances
 */
export const getApiSubscriptionsIdBenefitBalances = async (args: GetApiSubscriptionsIdBenefitBalancesArgs, options?: GetApiSubscriptionsIdBenefitBalancesOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/Subscriptions/${encodeURIComponent(String(args.id))}/benefit-balances${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(subscriptionBenefitBalancesDto, await res.json())
};