import {z} from 'zod'

export type InstrumentName = string;

export type Timestamp = number;

export type GetApiPublicGetFundingRateHistoryArgs = {instrument_name: InstrumentName, start_timestamp: Timestamp, end_timestamp: Timestamp};

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

export const timestamp = z.number().int();

export const price = z.number();

export const publicGetFundingRateHistoryResponse = z.object({jsonrpc: z.literal("2.0"), id: z.number().int().optional(), result: z.array(z.object({timestamp: timestamp.optional(), prev_index_price: price.optional(), index_price: price.optional(), interest_1h: z.number().optional(), interest_8h: 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
};

/**
 * Retrieves hourly historical funding rate (interest rate) data for a PERPETUAL instrument over a specified time period. Funding rates are periodic payments exchanged between long and short positions in perpetual contracts.
 * 
 * GET /public/get_funding_rate_history
 */
export const getApiPublicGetFundingRateHistory = async (args: GetApiPublicGetFundingRateHistoryArgs, options?: GetApiPublicGetFundingRateHistoryOptions) => {
const {baseUrl = "https://test.deribit.com/api/v2", fetch: fetchFn = fetch} = options ?? {}

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

if (args.instrument_name != null) query.append("instrument_name", String(args.instrument_name))
if (args.start_timestamp != null) query.append("start_timestamp", String(args.start_timestamp))
if (args.end_timestamp != null) query.append("end_timestamp", String(args.end_timestamp))

const url = `${baseUrl.replace(/\/+$/, '')}/public/get_funding_rate_history${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(publicGetFundingRateHistoryResponse, await res.json())
};