import {z} from 'zod'

export type CreateApiV3OrdersArgs = {body: {contract_id: string, label?: string | undefined, market_id: string, minimum_accepted_quantity?: number | undefined, price: number, quantity: number, side: 'buy' | 'sell', type?: ('good_til_cancelled' | 'keep_in_play' | 'good_til_halted' | 'immediate_or_cancel') | undefined}};

export type CreateApiV3OrdersOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const createApiV3OrdersResponse = z.object({available_balance: z.string(), available_quantity: z.number().int(), contract_id: z.string(), executed_avg_price: z.number().int().nullable(), exposure: z.string(), market_id: z.string(), order_id: z.string(), orig_price: z.number().int().nullable(), price: z.number().int().gte(1).lte(9999), quantity: z.number().int().gte(0).lte(4294967295), side: z.enum(["buy", "sell"]), total_executed_quantity: z.number().int()});

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
};

/**
 * Place orders on the exchange.
 * 
 * POST /v3/orders/
 */
export const createApiV3Orders = async (args: CreateApiV3OrdersArgs, options?: CreateApiV3OrdersOptions) => {
const {baseUrl = "https://api.smarkets.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (apiKey !== undefined) headers.set("Authorization", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/orders/${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiV3OrdersResponse, await res.json())
};