import {z} from 'zod'

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

export const credentialCreationOptions = z.object({publicKey: z.object({rp: z.object({name: z.string().optional(), id: z.string().optional()}).optional(), user: z.object({id: z.string().optional(), name: z.string().optional(), displayName: z.string().optional()}).optional(), challenge: z.string().optional(), pubKeyCredParams: z.array(z.object({type: z.literal("public-key").optional(), alg: z.number().optional()})).optional(), timeout: z.number().int().optional(), authenticatorSelection: z.object({authenticatorAttachment: z.enum(["platform", "cross-platform"]).optional(), requireResidentKey: z.boolean().optional(), residentKey: z.enum(["discouraged", "preferred", "required"]).optional(), userVerification: z.enum(["discouraged", "preferred", "required"]).optional()}).optional(), attestation: z.enum(["none", "indirect", "direct", "enterprise"]).optional()}).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
};

/**
 * Initialize WebAuthn registration
 * 
 * POST /webauthn/registration/initialize
 * 
 * Also accepts auth: BearerTokenAuth
 */
export const createApiWebauthnRegistrationInitialize = async (options?: CreateApiWebauthnRegistrationInitializeOptions) => {
const {baseUrl = "https://.hanko.io/admin", fetch: fetchFn = fetch, CookieAuth} = options ?? {}

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

if (CookieAuth !== undefined) cookies.push("hanko=" + encodeURIComponent(CookieAuth))

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

const res = await fetchFn(url, {method: "POST", headers})

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

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