import {z} from 'zod'

export type GetApiIndicativeRatesArgs = {SellCurrency: string, BuyCurrency: string, 'Crezco-Version'?: string | undefined};

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

export const indicativeRateResourceRepresentationVersion3 = z.object({sellCurrency: z.string().optional(), buyCurrency: z.string().optional(), rate: z.number().optional()});

export const getApiIndicativeRatesResponse = z.array(indicativeRateResourceRepresentationVersion3);

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 indicative FX rate for currency conversion
 * 
 * GET /indicative-rates
 */
export const getApiIndicativeRates = async (args: GetApiIndicativeRatesArgs, options?: GetApiIndicativeRatesOptions) => {
const {baseUrl = "https://api.partners.uat.crezco.com", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (args.SellCurrency != null) query.append("SellCurrency", String(args.SellCurrency))
if (args.BuyCurrency != null) query.append("BuyCurrency", String(args.BuyCurrency))
if (args['Crezco-Version'] != null) headers.set("Crezco-Version", String(args['Crezco-Version']))
if (Bearer !== undefined) headers.set("Authorization", Bearer)

const url = `${baseUrl.replace(/\/+$/, '')}/indicative-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(getApiIndicativeRatesResponse, await res.json())
};