import {z} from 'zod'

export type PaymentScheme = 'VISA' | 'MC';

export type FromCurrencyFxRateV2 = string;

export type ToCurrencyFxRateV2 = string;

export type GetFxRatesV2Request = {fromAmount: number, fromCurrency: FromCurrencyFxRateV2, toCurrency: ToCurrencyFxRateV2, issuerMarkupPercentage: number};

export type CreateApiV2PaymentSchemeFxArgs = {paymentScheme: PaymentScheme, auditUser: string, body: GetFxRatesV2Request};

export type CreateApiV2PaymentSchemeFxOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const fromCurrencyFxRateV2 = z.string();

export const toCurrencyFxRateV2 = z.string();

export const getFxRatesV2Response = z.object({fromAmount: z.number().optional(), fromCurrency: fromCurrencyFxRateV2.optional(), toCurrency: toCurrencyFxRateV2.optional(), toAmountWithSchemeRate: z.number().optional(), toAmountWithMarkup: z.number().optional(), toAmountWithEcbRate: z.number().optional(), fxRatePaymentScheme: z.number().optional(), fxRatePaymentSchemeRaw: z.number().optional(), fxRateWithMarkup: z.number().optional(), fxRateWithMarkupRaw: z.number().optional(), fxRateEcb: z.number().optional(), fxRateEcbRaw: z.number().optional(), markupPercentageOverEcb: z.number().gte(0).lte(100).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
};

/**
 * FX Exchange Rates for supported payment schemas (Visa, Mastercard)
 * 
 * POST /v2/{paymentScheme}/fx
 */
export const createApiV2PaymentSchemeFx = async (args: CreateApiV2PaymentSchemeFxArgs, options: CreateApiV2PaymentSchemeFxOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.auditUser != null) query.append("auditUser", String(args.auditUser))

const url = `${baseUrl.replace(/\/+$/, '')}/v2/${encodeURIComponent(String(args.paymentScheme))}/fx${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(getFxRatesV2Response, await res.json())
};