import {z} from 'zod'

export type GetApiScimGroupsArgs = {startIndex?: number | undefined, count?: number | undefined};

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

export const scimGroupMember = z.object({value: z.string(), display: z.string()});

export const scimGroup = z.object({schemas: z.array(z.string()).optional(), displayName: z.string().optional(), id: z.string(), members: z.array(scimGroupMember).optional(), "urn:okta:custom:group:1.0": z.object({description: z.string().optional()}).optional()});

export const listScimGroupsResponse = z.object({schemas: z.array(z.string()), totalResults: z.number().int(), startIndex: z.number().int(), itemsPerPage: z.number().int(), Resources: z.array(scimGroup)});

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
};

/**
 * List SCIM Groups
 * 
 * GET /scim/Groups
 */
export const getApiScimGroups = async (args: GetApiScimGroupsArgs, options?: GetApiScimGroupsOptions) => {
const {baseUrl = "https://api.attention.tech/v2", fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.startIndex != null) query.append("startIndex", String(args.startIndex))
if (args.count != null) query.append("count", String(args.count))
if (APIKeyHeader !== undefined) headers.set("Authorization", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/scim/Groups${query.size > 0 ? `?${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(listScimGroupsResponse, await res.json())
};