import {z} from 'zod'

export type GetApiGatewayV2TopicViewArgs = {vcluster?: string | undefined, name?: string | undefined, showDefaults?: boolean | undefined};

export type GetApiGatewayV2TopicViewOptions = {baseUrl: string, httpAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const topicViewMetadata = z.object({name: z.string(), vCluster: z.string().optional()});

export const transformation = z.object({type: z.string(), statement: z.string()});

export const onErrorStrategyType = z.enum(["DROP", "FAIL_FETCH"]);

export const onErrorStrategy = z.object({type: onErrorStrategyType});

export const topicViewSpec = z.object({transformation: transformation, onError: onErrorStrategy, physicalCluster: z.string().optional(), schemaRegistryConnectionName: z.string().optional()});

export const topicView = z.object({kind: z.string(), apiVersion: z.string(), metadata: topicViewMetadata, spec: topicViewSpec});

export const getApiGatewayV2TopicViewResponse = z.array(topicView);

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 /gateway/v2/topic-view
 */
export const getApiGatewayV2TopicView = async (args: GetApiGatewayV2TopicViewArgs, options: GetApiGatewayV2TopicViewOptions) => {
const {baseUrl, fetch: fetchFn = fetch, httpAuth} = options ?? {}

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

if (args.vcluster != null) query.append("vcluster", String(args.vcluster))
if (args.name != null) query.append("name", String(args.name))
if (args.showDefaults != null) query.append("showDefaults", String(args.showDefaults))
if (httpAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${httpAuth.username}:${httpAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/gateway/v2/topic-view${query.size > 0 ? `?${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(getApiGatewayV2TopicViewResponse, await res.json())
};