import {z} from 'zod'

export type GetApiV2RewardsValidatorsArgs = {seqno?: number | undefined, unixtime?: number | undefined, shallow?: boolean | undefined};

export type GetApiV2RewardsValidatorsOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const blockInfo = z.object({seqno: z.number().int(), utime: z.number().int().optional()});

export const roundInfo = z.object({end_block: z.number().int(), end_utime: z.number().int().optional(), start_block: z.number().int(), start_utime: z.number().int().optional()});

export const nominatorRewardEntry = z.object({address: z.string(), effective_stake: z.number().int(), reward: z.number().int(), stake: z.number().int(), weight: z.number()});

export const validatorRewardEntry = z.object({effective_stake: z.number().int(), nominators: z.array(nominatorRewardEntry).optional(), nominators_count: z.number().int().optional(), nominators_stake: z.number().int().optional(), owner_address: z.string().optional(), pool: z.string().optional(), pool_type: z.enum(["nominator-pool-v1.0", "single-nominator-pool-v1.0", "single-nominator-pool-v1.1", "other"]).optional(), public_key: z.string(), rank: z.number().int(), reward: z.number().int(), total_stake: z.number().int().optional(), validator_address: z.string().optional(), validator_reward_share: z.number().optional(), validator_stake: z.number().int().optional(), weight: z.number()});

export const validatorsResponse = z.object({block: blockInfo, election_id: z.number().int(), elector_balance: z.number().int(), next_election_id: z.number().int().optional(), prev_election_id: z.number().int().optional(), response_time_ms: z.number().int(), reward_per_block: z.number().int(), total_stake: z.number().int(), validation_round: roundInfo, validators: z.array(validatorRewardEntry)});

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 current validators
 * 
 * GET /v2/rewards/validators
 */
export const getApiV2RewardsValidators = async (args: GetApiV2RewardsValidatorsArgs, options?: GetApiV2RewardsValidatorsOptions) => {
const {baseUrl = "https://tonapi.io", fetch: fetchFn = fetch} = options ?? {}

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

if (args.seqno != null) query.append("seqno", String(args.seqno))
if (args.unixtime != null) query.append("unixtime", String(args.unixtime))
if (args.shallow != null) query.append("shallow", String(args.shallow))

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