import {z} from 'zod'

export type OffersSvcOfferType = 'ONRAMP' | 'OFFRAMP';

export type GetApiOffersLimitsArgs = {tokenSymbol?: string | undefined, fiatSymbol?: string | undefined, offerType?: OffersSvcOfferType | undefined, network?: string | undefined};

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

export const offersSvcOfferType = z.enum(["ONRAMP", "OFFRAMP"]);

export const offerLimitsDto = z.object({fiatSymbol: z.string(), tokenSymbol: z.string(), network: z.string().optional(), offerType: offersSvcOfferType.optional(), minTokens: z.number(), maxTokens: z.number(), minFiat: z.number().optional(), maxFiat: z.number().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
};

/**
 * Find matching offer for trading pair
 * 
 * GET /offers/limits
 */
export const getApiOffersLimits = async (args: GetApiOffersLimitsArgs, options?: GetApiOffersLimitsOptions) => {
const {baseUrl = "https://external.dev.onboardpay.co", fetch: fetchFn = fetch} = options ?? {}

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

if (args.tokenSymbol != null) query.append("tokenSymbol", String(args.tokenSymbol))
if (args.fiatSymbol != null) query.append("fiatSymbol", String(args.fiatSymbol))
if (args.offerType != null) query.append("offerType", String(args.offerType))
if (args.network != null) query.append("network", String(args.network))

const url = `${baseUrl.replace(/\/+$/, '')}/offers/limits${query.size > 0 ? `?${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(offerLimitsDto, await res.json())
};