import {z} from 'zod'

export type V2NamespaceSelector = {names: Array<string>};

export type V2ServiceLookupRequest = {selector: V2NamespaceSelector, parent: string};

export type CreateApiV2LookupServicesArgs = {body: V2ServiceLookupRequest};

export type CreateApiV2LookupServicesOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const v2Port = z.object({number: z.number().int(), name: z.string().optional(), serviceDeployments: z.array(z.string()).optional()});

export const v2ServiceType = z.enum(["INVALID_TYPE", "INTERNAL", "LOADBALANCER", "MESH_EXTERNAL"]);

export const v2State = z.enum(["INVALID_STATE", "EXTERNAL", "OBSERVED", "CONTROLLED"]);

export const metricConfigMetricType = z.enum(["INVALID", "SINGLE_INSTANCE", "SUBSET", "GLOBAL", "ENDPOINT", "ENDPOINT_INSTANCE"]);

export const serviceMetricConfig = z.object({name: z.string().optional(), description: z.string().optional(), aggregationKey: z.string().optional(), type: metricConfigMetricType.optional(), serviceDeployment: z.string().optional(), parentMetric: z.string().optional()});

export const serviceServiceDeployment = z.object({fqn: z.string().optional(), source: z.string().optional()});

export const v2Subset = z.object({name: z.string().optional(), serviceDeployments: z.array(z.string()).optional()});

export const v2Service = z.object({fqn: z.string().optional(), displayName: z.string().optional(), etag: z.string().optional(), description: z.string().optional(), shortName: z.string(), hostnames: z.array(z.string()).optional(), ports: z.array(v2Port).optional(), subsets: z.array(z.string()).optional(), serviceType: v2ServiceType, externalAddresses: z.array(z.string()).optional(), state: v2State, metrics: z.array(serviceMetricConfig).optional(), serviceDeployments: z.array(serviceServiceDeployment).optional(), subsetDeployments: z.array(v2Subset).optional(), canonicalName: z.string().optional(), spiffeIds: z.array(z.string()).optional()});

export const v2ServiceLookupResponse = z.object({services: z.array(v2Service).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 all the services in the registry that are part of the given selector.
 * This method can be used to resolve the registered services that are part of a workspace
 * or group.
 * This method can be also used to figure out how applying a selector could affect
 * the platform and have an understanding of which of the existing services would be
 * included in the selection.
 * 
 * POST /v2/lookup/services
 */
export const createApiV2LookupServices = async (args: CreateApiV2LookupServicesArgs, options: CreateApiV2LookupServicesOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/v2/lookup/services${query.size > 0 ? `?${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(v2ServiceLookupResponse, await res.json())
};