export type GetApiOauthIdpCallbackArgs = {code: string, state?: string | undefined};

export type GetApiOauthIdpCallbackOptions = {baseUrl: string, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

/**
 * Oauth2 callback from IDP to intent gateway
 * 
 * GET /oauth/idp_callback
 */
export const getApiOauthIdpCallback = async (args: GetApiOauthIdpCallbackArgs, options: GetApiOauthIdpCallbackOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()

if (args.code != null) query.append("code", String(args.code))
if (args.state != null) query.append("state", String(args.state))
if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

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

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

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

return undefined
};