import {z} from 'zod'

export type AssetSymbol = string;

export type OptionExpiryDate = string;

export type OptionType = 'CALL' | 'PUT';

export type OptionTypeOrExpiryDatetimeSortAsString = 'optionType' | 'expiryDatetime';

export type GetApiV1OptionLadderArgs = {baseSymbol: AssetSymbol, expiry?: OptionExpiryDate | undefined, type?: OptionType | undefined, sort?: OptionTypeOrExpiryDatetimeSortAsString | undefined};

export type GetApiV1OptionLadderOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const optionMarketSymbol = z.string();

export const assetSymbol = z.string();

export const quoteAssetSymbol = z.string();

export const optionType = z.enum(["CALL", "PUT"]);

export const dateTime = z.string();

export const optionGreeks = z.object({delta: z.string().optional(), gamma: z.string().optional(), theta: z.string().optional(), vega: z.string().optional()});

export const optionLadderResponse = z.object({symbol: optionMarketSymbol.optional(), baseSymbol: assetSymbol.optional(), settlementAssetSymbol: quoteAssetSymbol.optional(), bidQuantity: z.string().optional(), askQuantity: z.string().optional(), bidIVPercentage: z.string().optional(), askIVPercentage: z.string().optional(), bid: z.string().optional(), ask: z.string().optional(), underlyingPrice: z.string().optional(), optionStrikePrice: z.string().optional(), markPrice: z.string().optional(), quantity: z.string().optional(), openInterest: z.string().optional(), openInterestUSD: z.string().optional(), optionType: optionType.optional(), expiryDatetime: dateTime.optional(), greeks: optionGreeks.optional()});

export const getApiV1OptionLadderResponse = z.array(optionLadderResponse);

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 Option Ladder by Base Symbol
 * 
 * GET /v1/option-ladder
 */
export const getApiV1OptionLadder = async (args: GetApiV1OptionLadderArgs, options?: GetApiV1OptionLadderOptions) => {
const {baseUrl = "https://api.exchange.bullish.com/trading-api", fetch: fetchFn = fetch} = options ?? {}

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

if (args.baseSymbol != null) query.append("baseSymbol", String(args.baseSymbol))
if (args.expiry != null) query.append("expiry", String(args.expiry))
if (args.type != null) query.append("type", String(args.type))
if (args.sort != null) query.append("sort", String(args.sort))

const url = `${baseUrl.replace(/\/+$/, '')}/v1/option-ladder${query.size > 0 ? `?${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(getApiV1OptionLadderResponse, await res.json())
};