import {z} from 'zod'

export type GetApiV1OauthAuthorizeArgs = {'App-ID': string, 'Auth-Token': string, client_id: string, redirect_uri: string, scope: string, response_type: string, code_challenge: string, code_challenge_method?: string | undefined};

export type GetApiV1OauthAuthorizeOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const oAuth2AuthorizeClientSchema = z.object({name: z.string()});

export const oAuth2AuthorizeSystemDomain = z.object({id: z.string(), name: z.string()});

export const oAuth2AuthorizeUser = z.object({email: z.string(), first_name: z.string().nullable().optional(), id: z.string(), last_name: z.string().nullable().optional(), photo: z.string().nullable().optional()});

export const oAuth2AuthorizeDescribeSchema = z.object({client: oAuth2AuthorizeClientSchema, redirect_uri: z.string(), requires_admin_approval: z.boolean().optional(), scopes: z.array(z.string()), state: z.string().nullable().optional(), system_domain: oAuth2AuthorizeSystemDomain, user: oAuth2AuthorizeUser});

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
};

/**
 * Validate the authorization request and return consent metadata
 * 
 * GET /v1/oauth/authorize/
 */
export const getApiV1OauthAuthorize = async (args: GetApiV1OauthAuthorizeArgs, options: GetApiV1OauthAuthorizeOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args['App-ID'] != null) headers.set("App-ID", String(args['App-ID']))
if (args['Auth-Token'] != null) headers.set("Auth-Token", String(args['Auth-Token']))
if (args.client_id != null) query.append("client_id", String(args.client_id))
if (args.redirect_uri != null) query.append("redirect_uri", String(args.redirect_uri))
if (args.scope != null) query.append("scope", String(args.scope))
if (args.response_type != null) query.append("response_type", String(args.response_type))
if (args.code_challenge != null) query.append("code_challenge", String(args.code_challenge))
if (args.code_challenge_method != null) query.append("code_challenge_method", String(args.code_challenge_method))

const url = `${baseUrl.replace(/\/+$/, '')}/v1/oauth/authorize/${query.size > 0 ? `?${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 validateResponse(oAuth2AuthorizeDescribeSchema, await res.json())
};