import {z} from 'zod'

export type InputCharSet = 'numeric' | 'text';

export type TxCode = {input_mode?: InputCharSet | undefined, length?: number | undefined, description?: string | undefined};

export type GrantUrnIetf = {'pre-authorized_code'?: string | undefined, authorization_server?: string | undefined, tx_code?: TxCode | undefined};

export type GrantAuthorizationCode = {issuer_state?: string | undefined, authorization_server?: string | undefined};

export type CredentialOfferRequest = {credential_issuer?: string | undefined, credential_configuration_ids: Array<string>, grants?: ({'urn:ietf:params:oauth:grant-type:pre-authorized_code'?: GrantUrnIetf | undefined, authorization_code?: GrantAuthorizationCode | undefined}) | undefined, client_id?: string | undefined};

export type CreateApiWebappCredentialOffersArgs = {body: CredentialOfferRequest};

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

export const createApiWebappCredentialOffersResponse = z.object({uri: z.string().optional(), userPin: z.string().optional(), txCode: z.object({}).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
};

/**
 * Create credential offer
 * 
 * POST /webapp/credential-offers
 */
export const createApiWebappCredentialOffers = async (args: CreateApiWebappCredentialOffersArgs, options?: CreateApiWebappCredentialOffersOptions) => {
const {baseUrl = "https://agent.findynet.demo.sphereon.com/oid4vci", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/webapp/credential-offers${query.size > 0 ? `?${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(createApiWebappCredentialOffersResponse, await res.json())
};