import {z} from 'zod'

export type ApiIdentityType = 'IDENTITY_TYPE_UNKNOWN' | 'IDENTITY_TYPE_NONE' | 'IDENTITY_TYPE_SUB' | 'IDENTITY_TYPE_JWT' | 'IDENTITY_TYPE_MANUAL';

export type ApiIdentityContext = {identity?: string | undefined, type?: ApiIdentityType | undefined};

export type V2PathSeparator = 'PATH_SEPARATOR_UNKNOWN' | 'PATH_SEPARATOR_DOT' | 'PATH_SEPARATOR_SLASH';

export type V2DecisionTreeOptions = {path_separator?: V2PathSeparator | undefined};

export type ApiPolicyContext = {decisions?: Array<string> | undefined, path?: string | undefined};

export type ApiPolicyInstance = {instance_label?: string | undefined, name?: string | undefined};

export type V2DecisionTreeRequest = {identity_context?: ApiIdentityContext | undefined, options?: V2DecisionTreeOptions | undefined, policy_context?: ApiPolicyContext | undefined, policy_instance?: ApiPolicyInstance | undefined, resource_context?: Record<string, never> | undefined};

export type CreateApiApiV2AuthzDecisiontreeArgs = {body: V2DecisionTreeRequest};

export type CreateApiApiV2AuthzDecisiontreeOptions = {baseUrl: string, AuthorizerAPIKey?: string | undefined, TenantID?: string | undefined, fetch?: typeof fetch | undefined};

export const v2DecisionTreeResponse = z.object({path: z.object({}).optional(), path_root: 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
};

/**
 * Decision tree
 * 
 * POST /api/v2/authz/decisiontree
 */
export const createApiApiV2AuthzDecisiontree = async (args: CreateApiApiV2AuthzDecisiontreeArgs, options: CreateApiApiV2AuthzDecisiontreeOptions) => {
const {baseUrl, fetch: fetchFn = fetch, AuthorizerAPIKey, TenantID} = options ?? {}

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

if (AuthorizerAPIKey !== undefined) headers.set("authorization", AuthorizerAPIKey)
if (TenantID !== undefined) headers.set("aserto-tenant-id", TenantID)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/authz/decisiontree${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

return validateResponse(v2DecisionTreeResponse, await res.json())
};