import {z} from 'zod'

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

export const permissionReference = z.object({kind: z.string(), name: z.string().optional(), uuid: z.string()});

export const role = z.object({name: z.string().max(64), resources: z.object({permission_reference_list: z.array(permissionReference).optional()}), description: z.string().max(1000).optional()});

export const rightHandSide = z.object({collection: z.string().optional(), categories: z.record(z.string(), z.array(z.string())).optional(), uuid_list: z.array(z.string()).optional()});

export const entityFilterExpression = z.object({operator: z.string(), left_hand_side: z.object({entity_type: z.string().max(64).optional()}), right_hand_side: rightHandSide});

export const scopeFilterExpression = z.object({operator: z.string(), left_hand_side: z.string(), right_hand_side: rightHandSide});

export const filter = z.object({entity_filter_expression_list: z.array(entityFilterExpression), scope_filter_expression_list: z.array(scopeFilterExpression).optional()});

export const accessControlPolicyDetail = z.object({role: role.optional(), filter_list: z.object({context_list: z.array(filter).optional()}).optional()});

export const userInfo = z.object({access_control_policy_list: z.array(accessControlPolicyDetail).optional(), user_legacy_name: z.string().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
};

/**
 * Retrieves the Access control policies and other user data
 * for logged in user.
 * 
 * 
 * GET /users/info
 */
export const getApiUsersInfo = async (options: GetApiUsersInfoOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

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