import {z} from 'zod'

export type GetApiV3ExchangeRatesArgs = {amount: string, sourceCurrency: string, destinationCurrency: string, direction?: ('forward' | 'reverse') | undefined, orderType: 'onramp' | 'offramp' | 'payin' | 'payout' | 'fiat_prefund' | 'crypto_prefund' | 'swap' | 'gaming', paymentCode?: string | undefined, paymentType?: ('bank_transfer' | 'local_wallet' | 'card' | 'DEFAULT') | undefined, toPaymentCode?: string | undefined, toPaymentType?: ('bank_transfer' | 'local_wallet' | 'card' | 'DEFAULT') | undefined, MID: string};

export type GetApiV3ExchangeRatesOptions = {baseUrl?: string | undefined, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const getApiV3ExchangeRatesResponse = z.object({status: z.string().optional(), data: z.object({sourceCurrency: z.string().optional(), sourceAmount: z.number().int().optional(), sourceAmountInUsd: z.number().optional(), sourceCurrencyType: z.string().optional(), destinationCurrency: z.string().optional(), destinationAmount: z.number().optional(), destinationAmountInUsd: z.number().optional(), destinationCurrencyType: z.string().optional(), conversionRate: z.number().optional(), minLimit: z.number().int().optional(), maxLimit: z.number().optional(), orderType: z.string().optional(), direction: z.string().optional(), processingFee: z.number().optional(), processingFeeRate: z.number().optional(), customerFee: z.string().optional(), customerFeeRate: z.number().int().optional(), rrFeeRate: z.string().optional(), discount: z.string().optional(), discountRate: z.string().optional(), additionalFee: z.number().int().optional(), fixedFee: z.object({totalFixedFees: z.number().int().optional(), totalFixedTfFees: z.number().int().optional(), totalFixedCxFees: z.number().int().optional(), fixedFeesCurrency: z.string().optional(), fixedFeeDetails: z.object({baseFeeFixedRate: z.number().int().optional(), tfFeeFixedRate: z.number().int().optional(), cxFeeFixedRate: z.number().int().optional(), currency: z.string().optional()}).optional()}).optional(), totalFee: z.number().optional(), feeMode: z.string().optional()}).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
};

/**
 * Get Exchange Rates
 * 
 * GET /v3/exchange-rates
 */
export const getApiV3ExchangeRates = async (args: GetApiV3ExchangeRatesArgs, options?: GetApiV3ExchangeRatesOptions) => {
const {baseUrl = "https://sandbox-api.transfi.com", fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (args.amount != null) query.append("amount", String(args.amount))
if (args.sourceCurrency != null) query.append("sourceCurrency", String(args.sourceCurrency))
if (args.destinationCurrency != null) query.append("destinationCurrency", String(args.destinationCurrency))
if (args.direction != null) query.append("direction", String(args.direction))
if (args.orderType != null) query.append("orderType", String(args.orderType))
if (args.paymentCode != null) query.append("paymentCode", String(args.paymentCode))
if (args.paymentType != null) query.append("paymentType", String(args.paymentType))
if (args.toPaymentCode != null) query.append("toPaymentCode", String(args.toPaymentCode))
if (args.toPaymentType != null) query.append("toPaymentType", String(args.toPaymentType))
if (args.MID != null) headers.set("MID", String(args.MID))
if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/exchange-rates${query.size > 0 ? `?${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(getApiV3ExchangeRatesResponse, await res.json())
};