import {z} from 'zod'

export type GetApiV1ContractUnusualOiArgs = {limit?: number | undefined, min_oi_change?: number | undefined, min_oi_change_pct?: number | undefined, ticker?: string | undefined, right?: ('C' | 'P') | undefined, min_dte?: number | undefined, max_dte?: number | undefined, min_premium?: number | undefined, min_volume?: number | undefined, date?: string | undefined, order_by?: ('oi_change' | 'oi_change_pct' | 'volume' | 'premium') | undefined, direction?: ('opening' | 'closing' | 'both') | undefined, only_sweeps?: boolean | undefined, only_multi_leg?: boolean | undefined, exclude_multi_leg?: boolean | undefined};

export type GetApiV1ContractUnusualOiOptions = {baseUrl?: string | undefined, bearerApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const unusualOiItem = z.object({symbol: z.string(), ticker: z.string(), expiration: z.string(), strike: z.number(), right: z.enum(["C", "P"]), dte: z.number().int(), date: z.string(), openInterest: z.number().int().gte(0), prevOi: z.number().int().gte(0), oiChange: z.number().int(), oiChangePct: z.number(), volume: z.number().int().gte(0), premium: z.number(), volumeOiRatio: z.number(), bidVolume: z.number().int().gte(0), askVolume: z.number().int().gte(0), lastPrice: z.number(), underlyingPrice: z.number(), iv: z.number(), positionType: z.enum(["opening", "closing"]), sweepVolume: z.number().int().gte(0), sweepPremium: z.number(), multiLegVolume: z.number().int().gte(0), multiLegPremium: z.number()});

export const meta = z.object({timestamp: z.string(), requestId: z.string()});

export const unusualOiListSuccess = z.object({data: z.array(unusualOiItem), meta: meta});

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
};

/**
 * Contracts with significant OI changes
 * 
 * GET /v1/contract/unusual-oi
 */
export const getApiV1ContractUnusualOi = async (args: GetApiV1ContractUnusualOiArgs, options?: GetApiV1ContractUnusualOiOptions) => {
const {baseUrl = "https://flow-api.skylit.ai", fetch: fetchFn = fetch, bearerApiKey} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.min_oi_change != null) query.append("min_oi_change", String(args.min_oi_change))
if (args.min_oi_change_pct != null) query.append("min_oi_change_pct", String(args.min_oi_change_pct))
if (args.ticker != null) query.append("ticker", String(args.ticker))
if (args.right != null) query.append("right", String(args.right))
if (args.min_dte != null) query.append("min_dte", String(args.min_dte))
if (args.max_dte != null) query.append("max_dte", String(args.max_dte))
if (args.min_premium != null) query.append("min_premium", String(args.min_premium))
if (args.min_volume != null) query.append("min_volume", String(args.min_volume))
if (args.date != null) query.append("date", String(args.date))
if (args.order_by != null) query.append("order_by", String(args.order_by))
if (args.direction != null) query.append("direction", String(args.direction))
if (args.only_sweeps != null) query.append("only_sweeps", String(args.only_sweeps))
if (args.only_multi_leg != null) query.append("only_multi_leg", String(args.only_multi_leg))
if (args.exclude_multi_leg != null) query.append("exclude_multi_leg", String(args.exclude_multi_leg))
if (bearerApiKey !== undefined) headers.set('authorization', `Bearer ${bearerApiKey}`)

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