import {z} from 'zod'

export type InitiateTransferDto = {beneficiary?: Record<string, never> | undefined, beneficiaryId?: string | undefined, currency: 'NGN' | 'KES' | 'ZAR' | 'GHS' | 'XOF' | 'USD', amount: number, narration: string};

export type CreateApiV1TransferArgs = {body: InitiateTransferDto};

export type CreateApiV1TransferOptions = {baseUrl?: string | undefined, ApiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const publicTransferFeeBreakdownDto = z.object({fee: z.number(), vat: z.number(), processorFee: z.number(), allInclusiveKyshiFee: z.number(), totalFees: z.number(), others: z.record(z.string(), z.number())});

export const createApiV1TransferResponse = z.object({status: z.boolean(), message: z.string(), code: z.number(), data: z.object({transferCode: z.string(), reference: z.string(), fees: publicTransferFeeBreakdownDto})});

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
};

/**
 * Initiate transfer
 * 
 * POST /v1/transfer
 */
export const createApiV1Transfer = async (args: CreateApiV1TransferArgs, options?: CreateApiV1TransferOptions) => {
const {baseUrl = "https://api.kyshi.co", fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

if (ApiKeyAuth !== undefined) headers.set("x-api-key", ApiKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/transfer${query.size > 0 ? `?${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(createApiV1TransferResponse, await res.json())
};