import {z} from 'zod'

export type GetApiV2ArbitrageArgs = {sport?: (string | null) | undefined, limit?: number | undefined, authorization?: string | undefined};

export type GetApiV2ArbitrageOptions = {baseUrl?: string | undefined, bearerApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const arbitrageLegResponse = z.object({outcome: z.string(), venue: z.enum(["kalshi", "polymarket"]), side: z.enum(["yes", "no"]).nullable(), ask_usd: z.number().gt(0).lte(1), stake_fraction: z.number().gt(0).lte(1), available_contracts: z.number().gt(0), contract_id: z.string(), url: z.string().nullable()});

export const opportunityResponse = z.object({id: z.string(), market_id: z.string(), title: z.string().nullable(), category: z.string(), market_type: z.string(), sport: z.string().nullable().optional(), competition: z.string().nullable().optional(), location: z.string().nullable().optional(), asset: z.string().nullable().optional(), indicator: z.string().nullable().optional(), basis: z.string().nullable().optional(), institution: z.string().nullable().optional(), tags: z.array(z.string()), start_time: z.string().nullable(), edge_pct: z.number().gt(0), roi_pct: z.number().gt(0), fees_included: z.literal(true), fee_model: z.literal("conservative_per_contract"), cost_per_payout_usd: z.number().gt(0).lt(1), max_contracts: z.number().gt(0), max_wager_usd: z.number().gt(0), confidence: z.number().gte(0.95).lte(1), detected_at: z.string().nullable(), priced_at: z.string().nullable(), legs: z.array(arbitrageLegResponse)});

export const arbitrageResponse = z.object({as_of: z.string().nullable(), delay_seconds: z.number().gte(0), count: z.number().int().gte(0), opportunities: z.array(opportunityResponse)});

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
};

/**
 * Confirmed cross-venue arbitrage opportunities (v2)
 * 
 * GET /v2/arbitrage
 */
export const getApiV2Arbitrage = async (args: GetApiV2ArbitrageArgs, options?: GetApiV2ArbitrageOptions) => {
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.sport != null) query.append("sport", String(args.sport))
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/arbitrage${query.size > 0 ? `?${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(arbitrageResponse, await res.json())
};