import {z} from 'zod'

export type UnifiedOrderRequest = {action: 'open' | 'close', transaction: 'buy' | 'sell' | 'sellShort' | 'buyToCover', symbol?: (string | null) | undefined, instrumentId?: (number | null) | undefined, settlementType?: ('cfd' | 'real' | 'realFutures' | 'marginTrade' | null) | undefined, orderType?: ('mkt' | 'mit') | undefined, triggerRate?: (number | null) | undefined, leverage?: (number | null) | undefined, amount?: (number | null) | undefined, orderCurrency?: (string | null) | undefined, units?: (number | null) | undefined, contracts?: (number | null) | undefined, stopLossRate?: (number | null) | undefined, takeProfitRate?: (number | null) | undefined, stopLossType?: ('fixed' | 'trailing' | null) | undefined, additionalMargin?: (number | null) | undefined, positionIds?: (Array<number> | null) | undefined};

export type CreateApiApiV2TradingInfoCostsArgs = {'x-request-id': string, 'x-api-key': string, 'x-user-key': string, body: UnifiedOrderRequest};

export type CreateApiApiV2TradingInfoCostsOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const costBreakdown = z.object({costType: z.enum(["markup", "marketSpread", "transactionFee", "overnightFee", "overWeekendFee", "sdrt"]).optional(), amount: z.number().optional(), currency: z.string().optional()});

export const getCostResponse = z.object({instrumentId: z.number().int().optional(), symbol: z.string().nullable().optional(), costs: z.array(costBreakdown).optional(), lastUpdated: z.string().optional()});

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 what-if trading cost breakdown
 * 
 * POST /api/v2/trading/info/costs
 * 
 * Also accepts auth: oauth2, oauth2, oauth2
 */
export const createApiApiV2TradingInfoCosts = async (args: CreateApiApiV2TradingInfoCostsArgs, options?: CreateApiApiV2TradingInfoCostsOptions) => {
const {baseUrl = "https://public-api.etoro.com", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (args['x-request-id'] != null) headers.set("x-request-id", String(args['x-request-id']))
if (args['x-api-key'] != null) headers.set("x-api-key", String(args['x-api-key']))
if (args['x-user-key'] != null) headers.set("x-user-key", String(args['x-user-key']))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/trading/info/costs${query.size > 0 ? `?${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(getCostResponse, await res.json())
};