import {z} from 'zod'

export type GetApiCurrencyConversionArgs = {symbol: string, amount: number, date?: string | undefined, format?: ('JSON' | 'CSV') | undefined, delimiter?: string | undefined, dp?: number | undefined, timezone?: string | undefined};

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

export const getApiCurrencyConversionResponse = z.object({symbol: z.string(), rate: z.number(), amount: z.number().optional(), timestamp: z.number().int()});

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
};

/**
 * Currency conversion
 * 
 * GET /currency_conversion
 * 
 * Also accepts auth: queryParameter
 */
export const getApiCurrencyConversion = async (args: GetApiCurrencyConversionArgs, options?: GetApiCurrencyConversionOptions) => {
const {baseUrl = "https://api.twelvedata.com", fetch: fetchFn = fetch, authorizationHeader} = options ?? {}

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

if (args.symbol != null) query.append("symbol", String(args.symbol))
if (args.amount != null) query.append("amount", String(args.amount))
if (args.date != null) query.append("date", String(args.date))
if (args.format != null) query.append("format", String(args.format))
if (args.delimiter != null) query.append("delimiter", String(args.delimiter))
if (args.dp != null) query.append("dp", String(args.dp))
if (args.timezone != null) query.append("timezone", String(args.timezone))
if (authorizationHeader !== undefined) headers.set("Authorization", authorizationHeader)

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