import {z} from 'zod'

export type CurrencyEnum = 'KES' | 'GHS' | 'NGN' | 'UGX' | 'TZS' | 'XAF' | 'XOF';

export type ActionEnum = 'QUOTE' | 'EXCHANGE';

export type ExchangeSer = {currency: CurrencyEnum, amount: unknown, action: ActionEnum};

export type CreateApiApiV1WalletsIdExchangeArgs = {id: string, body: ExchangeSer};

export type CreateApiApiV1WalletsIdExchangeOptions = {baseUrl?: string | undefined, IntaSendBearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const currencyEnum = z.enum(["KES", "GHS", "NGN", "UGX", "TZS", "XAF", "XOF"]);

export const exchangeResponseSer = z.object({rate: z.string(), fxe_amount: z.string(), status: z.string(), currency: currencyEnum, narrative: 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
};

/**
 * Forex Exchange API
 * 
 * POST /api/v1/wallets/{id}/exchange/
 */
export const createApiApiV1WalletsIdExchange = async (args: CreateApiApiV1WalletsIdExchangeArgs, options?: CreateApiApiV1WalletsIdExchangeOptions) => {
const {baseUrl = "https://api.intasend.com", fetch: fetchFn = fetch, IntaSendBearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/wallets/${encodeURIComponent(String(args.id))}/exchange/${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(exchangeResponseSer, await res.json())
};