import {z} from 'zod'

export type GetApiMarketsArgs = {limit?: number | undefined, cursor?: string | undefined, event_ticker?: string | undefined, series_ticker?: string | undefined, min_created_ts?: number | undefined, max_created_ts?: number | undefined, min_updated_ts?: number | undefined, max_updated_ts?: number | undefined, max_close_ts?: number | undefined, min_close_ts?: number | undefined, min_settled_ts?: number | undefined, max_settled_ts?: number | undefined, status?: ('unopened' | 'open' | 'paused' | 'closed' | 'settled') | undefined, tickers?: string | undefined, mve_filter?: ('only' | 'exclude') | undefined};

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

export const fixedPointDollars = z.string();

export const fixedPointCount = z.string();

export const mveSelectedLeg = z.object({event_ticker: z.string().optional(), market_ticker: z.string().optional(), side: z.string().optional(), yes_settlement_value_dollars: fixedPointDollars.optional()});

export const priceRange = z.object({start: z.string(), end: z.string(), step: z.string()});

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

export const market = z.object({ticker: z.string(), event_ticker: z.string(), market_type: z.enum(["binary", "scalar"]), title: z.string().optional(), subtitle: z.string().optional(), yes_sub_title: z.string(), no_sub_title: z.string(), created_time: z.string(), updated_time: z.string(), open_time: z.string(), close_time: z.string(), expected_expiration_time: z.string().nullable().optional(), expiration_time: z.string().optional(), latest_expiration_time: z.string(), settlement_timer_seconds: z.number().int(), status: z.enum(["initialized", "inactive", "active", "closed", "determined", "disputed", "amended", "finalized"]), yes_bid_dollars: fixedPointDollars, yes_bid_size_fp: fixedPointCount, yes_ask_dollars: fixedPointDollars, yes_ask_size_fp: fixedPointCount, no_bid_dollars: fixedPointDollars, no_ask_dollars: fixedPointDollars, last_price_dollars: fixedPointDollars, volume_fp: fixedPointCount, volume_24h_fp: fixedPointCount, result: z.enum(["yes", "no", "scalar", ""]), can_close_early: z.boolean(), open_interest_fp: fixedPointCount, notional_value_dollars: fixedPointDollars, previous_yes_bid_dollars: fixedPointDollars, previous_yes_ask_dollars: fixedPointDollars, previous_price_dollars: fixedPointDollars, settlement_value_dollars: fixedPointDollars.optional(), settlement_ts: z.string().nullable().optional(), settlement_bounds_type: z.enum(["default", "floor"]), settlement_floor_dollars: fixedPointDollars.optional(), expiration_value: z.string(), occurrence_datetime: z.string().nullable().optional(), fee_waiver_expiration_time: z.string().nullable().optional(), early_close_condition: z.string().nullable().optional(), strike_type: z.enum(["greater", "greater_or_equal", "less", "less_or_equal", "between", "functional", "custom", "structured"]).optional(), floor_strike: z.number().nullable().optional(), cap_strike: z.number().nullable().optional(), functional_strike: z.string().nullable().optional(), custom_strike: z.object({}).nullable().optional(), rules_primary: z.string(), rules_secondary: z.string(), mve_collection_ticker: z.string().optional(), mve_selected_legs: z.array(mveSelectedLeg).optional(), primary_participant_key: z.string().nullable().optional(), price_level_structure: z.string(), price_ranges: z.array(priceRange), is_provisional: z.boolean().optional(), exchange_index: exchangeIndex.optional()});

export const getMarketsResponse = z.object({markets: z.array(market), cursor: z.string()});

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 Markets
 * 
 * GET /markets
 */
export const getApiMarkets = async (args: GetApiMarketsArgs, options?: GetApiMarketsOptions) => {
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.limit != null) query.append("limit", String(args.limit))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (args.event_ticker != null) query.append("event_ticker", String(args.event_ticker))
if (args.series_ticker != null) query.append("series_ticker", String(args.series_ticker))
if (args.min_created_ts != null) query.append("min_created_ts", String(args.min_created_ts))
if (args.max_created_ts != null) query.append("max_created_ts", String(args.max_created_ts))
if (args.min_updated_ts != null) query.append("min_updated_ts", String(args.min_updated_ts))
if (args.max_updated_ts != null) query.append("max_updated_ts", String(args.max_updated_ts))
if (args.max_close_ts != null) query.append("max_close_ts", String(args.max_close_ts))
if (args.min_close_ts != null) query.append("min_close_ts", String(args.min_close_ts))
if (args.min_settled_ts != null) query.append("min_settled_ts", String(args.min_settled_ts))
if (args.max_settled_ts != null) query.append("max_settled_ts", String(args.max_settled_ts))
if (args.status != null) query.append("status", String(args.status))
if (args.tickers != null) query.append("tickers", String(args.tickers))
if (args.mve_filter != null) query.append("mve_filter", String(args.mve_filter))

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