import {z} from 'zod'

export type GetApiQueueArgs = {limit?: number | undefined, offset?: number | undefined, ordering?: string | undefined, running?: string | undefined, finished?: string | undefined, queued?: string | undefined};

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

export const taskSummary = z.object({detail_type: z.string(), identifier: z.string(), priority: z.number(), description: z.string(), assigned_to: z.string(), created: z.string(), last_updated: z.string(), state: z.number().int(), task: z.string(), success: z.boolean(), runtime: z.number(), worker_labels: z.string()});

export const getApiQueueResponse = z.array(taskSummary);

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
};

/**
 * List task queue
 * 
 * GET /queue
 */
export const getApiQueue = async (args: GetApiQueueArgs, options: GetApiQueueOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.offset != null) query.append("offset", String(args.offset))
if (args.ordering != null) query.append("ordering", String(args.ordering))
if (args.running != null) query.append("running", String(args.running))
if (args.finished != null) query.append("finished", String(args.finished))
if (args.queued != null) query.append("queued", String(args.queued))
if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

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