import {z} from 'zod'

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

export const serviceProviderConfigResponse = z.object({schemas: z.array(z.string()).optional(), documentationUrl: z.string().optional(), patch: z.object({supported: z.boolean()}).optional(), bulk: z.object({supported: z.boolean()}).optional(), filter: z.object({supported: z.boolean(), maxResults: z.number().int()}).optional(), changePassword: z.object({supported: z.boolean()}).optional(), sort: z.object({supported: z.boolean()}).optional(), etag: z.object({supported: z.boolean()}).optional(), authenticationSchemes: z.array(z.object({name: z.string().optional(), description: z.string().optional(), specUri: z.string().optional(), documentationUri: z.string().optional(), type: z.string().optional(), primary: z.boolean().optional()})).optional(), "urn:okta:schemas:scim:providerconfig:1.0": z.object({userManagementCapabilities: z.array(z.string()).optional()}).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
};

/**
 * Get SCIM Service Provider Config
 * 
 * GET /scim/ServiceProviderConfigs
 */
export const getApiScimServiceProviderConfigs = async (options?: GetApiScimServiceProviderConfigsOptions) => {
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 (APIKeyHeader !== undefined) headers.set("Authorization", APIKeyHeader)

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