import {z} from 'zod'

export type MD5 = string;

export type GetApiGetChallengesArgs = {block_id: MD5};

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

export const challengeId = z.string();

export const challengeState = z.object({round_active: z.number().int().optional()});

export const challengeBlockData = z.object({num_qualifiers_by_track: z.record(z.string(), z.number().int()).optional(), qualifier_qualities_by_track: z.unknown()});

export const challenge = z.object({id: challengeId.optional(), config: z.object({}).optional(), state: challengeState.optional(), block_data: challengeBlockData.optional()});

export const getChallengesResponse = z.object({challenges: z.array(challenge).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 latest data for all challenges
 * 
 * GET /get-challenges
 */
export const getApiGetChallenges = async (args: GetApiGetChallengesArgs, options?: GetApiGetChallengesOptions) => {
const {baseUrl = "https://mainnet-api.tig.foundation", fetch: fetchFn = fetch} = options ?? {}

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

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

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