import {z} from 'zod'

export type GetApiV1RatesMarketBenchmarkArgs = {fromAsset?: string | undefined, toAsset?: string | undefined, amount?: string | undefined, pairs?: string | undefined};

export type GetApiV1RatesMarketBenchmarkOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiV1RatesMarketBenchmarkResponse = z.object({data: z.union([z.object({fromAsset: z.string().optional(), toAsset: z.string().optional(), bestRate: z.string().nullable().optional()}), z.array(z.object({fromAsset: z.string().optional(), toAsset: z.string().optional(), bestRate: z.string().nullable().optional()}))]).optional(), message: z.string().optional(), statusCode: 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
};

/**
 * Get Market Benchmark
 * 
 * GET /v1/rates/market-benchmark
 */
export const getApiV1RatesMarketBenchmark = async (args: GetApiV1RatesMarketBenchmarkArgs, options?: GetApiV1RatesMarketBenchmarkOptions) => {
const {baseUrl = "https://api.blockradar.co", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.fromAsset != null) query.append("fromAsset", String(args.fromAsset))
if (args.toAsset != null) query.append("toAsset", String(args.toAsset))
if (args.amount != null) query.append("amount", String(args.amount))
if (args.pairs != null) query.append("pairs", String(args.pairs))
if (apiKey !== undefined) headers.set("x-api-key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/rates/market-benchmark${query.size > 0 ? `?${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(getApiV1RatesMarketBenchmarkResponse, await res.json())
};