import {z} from 'zod'

export type ForwardRequestSource = {type: string, id: string, cvv_token?: string | undefined, pin_token?: string | undefined} | {type: string, token: string, store_for_future_use?: boolean | undefined};

export type ForwardRequestNetworkToken = {enabled?: boolean | undefined, request_cryptogram?: boolean | undefined};

export type ForwardBodyHeadersRequest = {encrypted?: string | undefined, raw: {[key: string]: string}};

export type ForwardRequestSignature = {type: string, dlocal_parameters: {secret_key: string}} | {type: string, mastercard_parameters: {consumer_key: string, signing_key: string}} | {type: string, visa_parameters: {shared_secret: string, remove_resource_path_prefix?: string | undefined}};

export type ForwardDestinationRequest = {url: string, method: 'GET' | 'HEAD' | 'POST' | 'PUT' | 'DELETE' | 'OPTIONS' | 'TRACE' | 'PATCH', headers: ForwardBodyHeadersRequest, body: string, signature?: ForwardRequestSignature | undefined, variables?: (Array<{name?: string | undefined, value?: string | undefined}>) | undefined, query?: (Array<{name?: string | undefined, value?: string | undefined}>) | undefined};

export type ForwardRequest = {source: ForwardRequestSource, reference?: string | undefined, processing_channel_id?: string | undefined, network_token?: ForwardRequestNetworkToken | undefined, destination_request: ForwardDestinationRequest};

export type CreateApiForwardArgs = {body: ForwardRequest};

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

export const forwardBodyResponse = z.object({status: z.number(), headers: z.record(z.string(), z.array(z.string())), body: z.string()});

export const forwardResponse = z.object({request_id: z.string(), destination_response: forwardBodyResponse.optional(), source: z.object({id: z.string().optional(), bin: z.string().max(8), last4: z.string().min(4).max(4), fingerprint: z.string().min(64).max(64)}).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
};

/**
 * Forward an API request
 * 
 * POST /forward
 * 
 * Also accepts auth: ApiSecretKey
 */
export const createApiForward = async (args: CreateApiForwardArgs, options?: CreateApiForwardOptions) => {
const {baseUrl = "https://forward.checkout.com", fetch: fetchFn = fetch, OAuth} = options ?? {}

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

if (OAuth !== undefined) headers.set('authorization', `Bearer ${OAuth}`)

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