import {z} from 'zod'

export type GetApiV2SpreadsArgs = {category?: (string | null) | undefined, sport?: (string | null) | undefined, competition?: (string | null) | undefined, location?: (string | null) | undefined, asset?: (string | null) | undefined, indicator?: (string | null) | undefined, basis?: (string | null) | undefined, institution?: (string | null) | undefined, min_gap?: (number | null) | undefined, limit?: number | undefined, authorization?: string | undefined};

export type GetApiV2SpreadsOptions = {baseUrl?: string | undefined, bearerApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiV2SpreadsResponse = z.unknown();

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
};

/**
 * Cross-venue price-gap view over matched pairs (v2)
 * 
 * GET /v2/spreads
 */
export const getApiV2Spreads = async (args: GetApiV2SpreadsArgs, options?: GetApiV2SpreadsOptions) => {
const {baseUrl = "https://api.dino.markets", fetch: fetchFn = fetch, bearerApiKey} = options ?? {}

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

if (args.category != null) query.append("category", String(args.category))
if (args.sport != null) query.append("sport", String(args.sport))
if (args.competition != null) query.append("competition", String(args.competition))
if (args.location != null) query.append("location", String(args.location))
if (args.asset != null) query.append("asset", String(args.asset))
if (args.indicator != null) query.append("indicator", String(args.indicator))
if (args.basis != null) query.append("basis", String(args.basis))
if (args.institution != null) query.append("institution", String(args.institution))
if (args.min_gap != null) query.append("min_gap", String(args.min_gap))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.authorization != null) headers.set("authorization", String(args.authorization))
if (bearerApiKey !== undefined) headers.set('authorization', `Bearer ${bearerApiKey}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/spreads${query.size > 0 ? `?${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(getApiV2SpreadsResponse, await res.json())
};