import {z} from 'zod'

export type GetApiV1FxRatesArgs = {'X-API-Key'?: string | undefined, sourceCurrency: string, sourceNetwork?: string | undefined, sourceRail?: string | undefined, destinationCurrency: string, destinationNetwork?: string | undefined, destinationRail?: string | undefined, onBehalfOf?: string | undefined};

export type GetApiV1FxRatesOptions = {baseUrl?: string | undefined, bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const fxRateResponseDto = z.object({rate: z.string(), asOf: z.string(), pairKey: z.string(), source: z.literal("reference")});

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 an indicative FX rate for a pair
 * 
 * GET /v1/fx/rates
 * 
 * Also accepts auth: bearer
 */
export const getApiV1FxRates = async (args: GetApiV1FxRatesArgs, options?: GetApiV1FxRatesOptions) => {
const {baseUrl = "https://sandbox.api.infinite.dev", fetch: fetchFn = fetch, bearer} = options ?? {}

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

if (args['X-API-Key'] != null) headers.set("X-API-Key", String(args['X-API-Key']))
if (args.sourceCurrency != null) query.append("sourceCurrency", String(args.sourceCurrency))
if (args.sourceNetwork != null) query.append("sourceNetwork", String(args.sourceNetwork))
if (args.sourceRail != null) query.append("sourceRail", String(args.sourceRail))
if (args.destinationCurrency != null) query.append("destinationCurrency", String(args.destinationCurrency))
if (args.destinationNetwork != null) query.append("destinationNetwork", String(args.destinationNetwork))
if (args.destinationRail != null) query.append("destinationRail", String(args.destinationRail))
if (args.onBehalfOf != null) query.append("onBehalfOf", String(args.onBehalfOf))
if (bearer !== undefined) headers.set('authorization', `Bearer ${bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/fx/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(fxRateResponseDto, await res.json())
};