import {z} from 'zod'

export type GetApiCmcV1TickerOptions = {baseUrl: string, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const coinMarketCapTicker = z.object({base_id: z.string(), quote_id: z.string(), base_name: z.string(), base_symbol: z.string(), quote_name: z.string(), quote_symbol: z.string(), last_price: z.number(), base_volume: z.number(), quote_volume: z.number(), isFrozen: z.union([z.literal(0), z.literal(1)])});

export const coinMarketCapTickerResponse = z.record(z.string(), coinMarketCapTicker);

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
};

/**
 * CoinMarketCap ticker (v1)
 * 
 * GET /cmc/v1/ticker
 */
export const getApiCmcV1Ticker = async (options: GetApiCmcV1TickerOptions) => {
const {baseUrl, fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (apiKey !== undefined) headers.set("X-API-Key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/cmc/v1/ticker${query.size > 0 ? `?${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(coinMarketCapTickerResponse, await res.json())
};