import {z} from 'zod'

export type GetApiSeriesArgs = {category?: string | undefined, tags?: string | undefined, include_product_metadata?: boolean | undefined, include_volume?: boolean | undefined, min_updated_ts?: number | undefined};

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

export const settlementSource = z.object({name: z.string().optional(), url: z.string().optional()});

export const feeType = z.enum(["quadratic", "quadratic_with_maker_fees", "quadratic_with_combo_maker_fees", "flat"]);

export const fixedPointCount = z.string();

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

export const series = z.object({ticker: z.string(), frequency: z.string(), title: z.string(), category: z.string(), categories: z.array(z.string()), tags: z.array(z.string()).nullable(), settlement_sources: z.array(settlementSource).nullable(), contract_url: z.string(), contract_terms_url: z.string(), product_metadata: z.object({}).nullable().optional(), fee_type: feeType, fee_multiplier: z.number(), additional_prohibitions: z.array(z.string()).nullable(), volume_fp: fixedPointCount.optional(), last_updated_ts: z.string().optional(), exchange_index: exchangeIndex.optional()});

export const getSeriesListResponse = z.object({series: z.array(series)});

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 Series List
 * 
 * GET /series
 */
export const getApiSeries = async (args: GetApiSeriesArgs, options?: GetApiSeriesOptions) => {
const {baseUrl = "https://external-api.kalshi.com/trade-api/v2", fetch: fetchFn = fetch} = 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.tags != null) query.append("tags", String(args.tags))
if (args.include_product_metadata != null) query.append("include_product_metadata", String(args.include_product_metadata))
if (args.include_volume != null) query.append("include_volume", String(args.include_volume))
if (args.min_updated_ts != null) query.append("min_updated_ts", String(args.min_updated_ts))

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