import {z} from 'zod'

export type GetApiProofV2CardanoTransactionArgs = {transaction_hashes: Array<unknown>};

export type GetApiProofV2CardanoTransactionOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const cardanoTransaction = z.object({transaction_hash: z.string(), block_hash: z.string(), block_number: z.number().int(), slot_number: z.number().int()});

export const cardanoTransactionProofV2Message = z.object({certificate_hash: z.string(), certified_transactions: z.union([z.unknown(), z.object({items: z.array(cardanoTransaction), proof: z.string()})]), non_certified_transactions: z.array(z.string()), latest_block_number: z.number().int(), security_parameter: 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
};

/**
 * (Unstable) Get the proofs of a Cardano transaction list from Cardano Blocks and Transactions snapshots
 * 
 * GET /proof/v2/cardano-transaction
 */
export const getApiProofV2CardanoTransaction = async (args: GetApiProofV2CardanoTransactionArgs, options?: GetApiProofV2CardanoTransactionOptions) => {
const {baseUrl = "https://aggregator.release-preprod.api.mithril.network/aggregator", fetch: fetchFn = fetch} = options ?? {}

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

if (args.transaction_hashes != null) query.append("transaction_hashes", args.transaction_hashes.join(','))

const url = `${baseUrl.replace(/\/+$/, '')}/proof/v2/cardano-transaction${query.size > 0 ? `?${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(cardanoTransactionProofV2Message, await res.json())
};