import {z} from 'zod'

export type BodyAuthLogin = {grant_type?: (string | null) | undefined, username: string, password: string, scope?: string | undefined, client_id?: (string | null) | undefined, client_secret?: (string | null) | undefined};

export type CreateApiAuthTokenArgs = {'user-agent'?: (string | null) | undefined, 'x-real-ip'?: (string | null) | undefined, 'x-forwarded-for'?: (string | null) | undefined, 'x-client-ip'?: (string | null) | undefined, session_id?: (number | null) | undefined, body: BodyAuthLogin};

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

export const tokenOut = z.object({access_token: z.string(), token_type: z.string()});

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
};

/**
 * Log in
 * 
 * POST /auth/token
 */
export const createApiAuthToken = async (args: CreateApiAuthTokenArgs, options?: CreateApiAuthTokenOptions) => {
const {baseUrl = "https://api.your-domain.com", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
const cookies: string[] = []
headers.set('content-type', "application/x-www-form-urlencoded")
headers.set('accept', "application/json")

if (args['user-agent'] != null) headers.set("user-agent", String(args['user-agent']))
if (args['x-real-ip'] != null) headers.set("x-real-ip", String(args['x-real-ip']))
if (args['x-forwarded-for'] != null) headers.set("x-forwarded-for", String(args['x-forwarded-for']))
if (args['x-client-ip'] != null) headers.set("x-client-ip", String(args['x-client-ip']))
if (args.session_id != null) cookies.push("session_id=" + encodeURIComponent(String(args.session_id)))
if (cookies.length > 0) headers.set('cookie', cookies.join('; '))

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

const res = await fetchFn(url, {method: "POST", headers, body: new URLSearchParams(Object.entries(args.body).flatMap(([key, value]) => (value == null ? [] : [[key, String(value)]])))})

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

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