import {z} from 'zod'

export type GetApiTimeseriesExchangeMetricsArgs = {exchanges: Array<string>, metrics: Array<string>, frequency?: string | undefined, start_time?: string | undefined, end_time?: string | undefined, start_inclusive?: boolean | undefined, end_inclusive?: boolean | undefined, timezone?: string | undefined, page_size?: number | undefined, paging_from?: ('start' | 'end') | undefined, sort?: ('exchange' | 'time') | undefined, limit_per_exchange?: number | undefined, pretty?: boolean | undefined, format?: ('json' | 'csv') | undefined, next_page_token?: string | undefined};

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

export const exchange = z.string();

export const time = z.string();

export const nextPageToken = z.string();

export const nextPageUrl = z.string();

export const exchangeMetricsResponse = z.object({data: z.array(z.object({exchange: exchange, time: time}).and(z.record(z.string(), z.string().nullable()))), next_page_token: nextPageToken.optional(), next_page_url: nextPageUrl.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
};

/**
 * Exchange metrics
 * 
 * GET /timeseries/exchange-metrics
 */
export const getApiTimeseriesExchangeMetrics = async (args: GetApiTimeseriesExchangeMetricsArgs, options?: GetApiTimeseriesExchangeMetricsOptions) => {
const {baseUrl = "https://api.coinmetrics.io/v4", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.exchanges != null) query.append("exchanges", args.exchanges.join(','))
if (args.metrics != null) query.append("metrics", args.metrics.join(','))
if (args.frequency != null) query.append("frequency", String(args.frequency))
if (args.start_time != null) query.append("start_time", String(args.start_time))
if (args.end_time != null) query.append("end_time", String(args.end_time))
if (args.start_inclusive != null) query.append("start_inclusive", String(args.start_inclusive))
if (args.end_inclusive != null) query.append("end_inclusive", String(args.end_inclusive))
if (args.timezone != null) query.append("timezone", String(args.timezone))
if (args.page_size != null) query.append("page_size", String(args.page_size))
if (args.paging_from != null) query.append("paging_from", String(args.paging_from))
if (args.sort != null) query.append("sort", String(args.sort))
if (args.limit_per_exchange != null) query.append("limit_per_exchange", String(args.limit_per_exchange))
if (args.pretty != null) query.append("pretty", String(args.pretty))
if (args.format != null) query.append("format", String(args.format))
if (args.next_page_token != null) query.append("next_page_token", String(args.next_page_token))
if (apiKey !== undefined) query.set("api_key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/timeseries/exchange-metrics${query.size > 0 ? `?${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(exchangeMetricsResponse, await res.json())
};