import {z} from 'zod'

export type AdjustBenefitRedemptionDto = {quantityDelta?: (number | unknown) | undefined, reason?: string | undefined};

export type CreateApiSubscriptionsIdBenefitsBenefitIdAdjustArgs = {id: string, benefitId: string, body: AdjustBenefitRedemptionDto};

export type CreateApiSubscriptionsIdBenefitsBenefitIdAdjustOptions = {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
};

/**
 * Manual redemption adjustment (ITE-661) — the staff escape hatch for the
 * inevitable edge case (a benefit honored off-system, a refund the clinic
 * wants to un-count, a courtesy re-grant). Positive delta records extra
 * usage; negative delta gives allowance back. Every adjustment is a signed
 * ledger row with a required reason and the acting user — audited, never a
 * silent counter edit.
 * 
 * POST /Subscriptions/{id}/benefits/{benefitId}/adjust
 */
export const createApiSubscriptionsIdBenefitsBenefitIdAdjust = async (args: CreateApiSubscriptionsIdBenefitsBenefitIdAdjustArgs, options?: CreateApiSubscriptionsIdBenefitsBenefitIdAdjustOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

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

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

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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())
};