import {z} from 'zod'

export type GetApiWorkqueuesArgs = {pretty?: boolean | undefined};

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

export const getApiWorkqueuesResponse = z.array(z.object({name: z.string().optional(), references: z.number().int().optional(), minimum_threads: z.number().int().optional(), maximum_threads: z.number().int().optional(), current_threads: z.number().int().optional(), busy: z.number().int().optional(), working: z.number().int().optional(), delayed: z.number().int().optional(), barrier_id: z.number().int().optional(), calls: z.number().int().optional(), latency_ns: z.number().int().optional(), wmesg: z.string().optional(), state: z.enum(["R", "S", "D", "Z", "T", "t", "W", "X", "x", "K", "P"]).optional(), processor: z.number().int().optional(), time: z.string().optional(), thread_id: z.number().int().optional(), thread_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
};

/**
 * Get the process' `/proc/self/task/[tid]/stat` information.
 * 
 * GET /workqueues
 */
export const getApiWorkqueues = async (args: GetApiWorkqueuesArgs, options?: GetApiWorkqueuesOptions) => {
const {baseUrl = "http://localhost", fetch: fetchFn = fetch} = options ?? {}

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

if (args.pretty != null) query.append("pretty", String(args.pretty))

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