import {z} from 'zod'

export type UUID = string;

export type CurrencyCode = 'EUR' | 'USD' | 'GBP' | 'CHF' | 'JPY' | 'SGD' | 'SEK' | 'NOK' | 'DKK' | 'PLN' | 'HUF' | 'CZK';

export type GetApiExchangeRatesLatestArgs = {fundId: UUID, quoteCurrency: CurrencyCode, baseCurrency: CurrencyCode, latestUpdateDate?: string | undefined, fallbackToAnyOtherFund?: ('true' | 'false') | undefined};

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

export const uUID = z.string();

export const day = z.string();

export const currencyCode = z.enum(["EUR", "USD", "GBP", "CHF", "JPY", "SGD", "SEK", "NOK", "DKK", "PLN", "HUF", "CZK"]);

export const getApiExchangeRatesLatestResponse = z.object({id: uUID, fundId: uUID, day: day, baseCurrency: currencyCode, quoteCurrency: currencyCode, fxRate: z.string(), kind: z.enum(["indicative", "execution"]).optional(), updatedAt: z.string()});

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/latest
 */
export const getApiExchangeRatesLatest = async (args: GetApiExchangeRatesLatestArgs, options?: GetApiExchangeRatesLatestOptions) => {
const {baseUrl = "https://public-api.spiko.io/v0", fetch: fetchFn = fetch} = options ?? {}

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

if (args.fundId != null) query.append("fundId", String(args.fundId))
if (args.quoteCurrency != null) query.append("quoteCurrency", String(args.quoteCurrency))
if (args.baseCurrency != null) query.append("baseCurrency", String(args.baseCurrency))
if (args.latestUpdateDate != null) query.append("latestUpdateDate", String(args.latestUpdateDate))
if (args.fallbackToAnyOtherFund != null) query.append("fallbackToAnyOtherFund", String(args.fallbackToAnyOtherFund))

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