import {z} from 'zod'

export type GetApiTxsHashPoolUpdatesArgs = {hash: unknown};

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

export const txContentPoolCerts = z.array(z.object({cert_index: z.number().int(), pool_id: z.string(), vrf_key: z.string(), pledge: z.string(), margin_cost: z.number(), fixed_cost: z.string(), reward_account: z.string(), owners: z.array(z.string()), metadata: z.object({url: z.string().nullable(), hash: z.string().nullable(), ticker: z.string().nullable(), name: z.string().nullable(), description: z.string().nullable(), homepage: z.string().nullable()}).nullable(), relays: z.array(z.object({ipv4: z.string().nullable(), ipv6: z.string().nullable(), dns: z.string().nullable(), dns_srv: z.string().nullable(), port: z.number().int()})), active_epoch: z.number().int()}));

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
};

/**
 * Transaction stake pool registration and update certificates
 * 
 * GET /txs/{hash}/pool_updates
 */
export const getApiTxsHashPoolUpdates = async (args: GetApiTxsHashPoolUpdatesArgs, options?: GetApiTxsHashPoolUpdatesOptions) => {
const {baseUrl = "https://cardano-mainnet.blockfrost.io/api/v0", fetch: fetchFn = fetch, projectId} = options ?? {}

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

if (projectId !== undefined) headers.set("project_id", projectId)

const url = `${baseUrl.replace(/\/+$/, '')}/txs/${encodeURIComponent(String(args.hash))}/pool_updates${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(txContentPoolCerts, await res.json())
};