import {z} from 'zod'

export type GetApiV1CryptosCryptoCodeEventsArgs = {cryptoCode: string, lastEventId?: number | undefined, longPolling?: boolean | undefined, limit?: number | undefined};

export type GetApiV1CryptosCryptoCodeEventsOptions = {baseUrl: string, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const newBlockEvent = z.object({height: z.number().int().optional(), hash: z.string().optional(), previousBlockHash: z.string().optional(), cryptoCode: z.string().optional(), confirmations: z.number().int().optional()});

export const transactionMetadata = z.object({vsize: z.number().int().nullable().optional(), fees: z.number().int().nullable().optional(), feeRate: z.number().nullable().optional(), chunk: z.object({fees: z.number().int().nullable().optional(), weight: z.number().int().nullable().optional(), feeRate: z.number().nullable().optional()}).nullable().optional()}).nullable();

export const transactionResult = z.object({blockId: z.string().nullable().optional(), confirmations: z.number().int().optional(), height: z.number().int().nullable().optional(), transactionHash: z.string().optional(), transaction: z.string().optional(), metadata: transactionMetadata.optional(), timestamp: z.number().int().optional(), replacedBy: z.string().nullable().optional()});

export const transactionOutput = z.object({address: z.string().optional(), scriptPubKey: z.string().optional(), index: z.number().int().optional(), feature: z.string().nullable().optional(), value: z.number().int().optional(), keyPath: z.string().optional(), keyIndex: z.number().int().optional()});

export const transactionInput = z.object({inputIndex: z.number().int().optional(), transactionId: z.string().optional(), index: z.number().int().optional(), feature: z.string().nullable().optional(), address: z.string().optional(), scriptPubKey: z.string().optional(), keyPath: z.string().optional(), keyIndex: z.number().int().optional(), value: z.number().int().optional()});

export const newTransactionEvent = z.object({blockId: z.string().nullable().optional(), trackedSource: z.string().optional(), derivationStrategy: z.string().optional(), transactionData: transactionResult.optional(), outputs: z.array(transactionOutput).optional(), inputs: z.array(transactionInput).optional(), cryptoCode: z.string().optional(), replacing: z.array(z.string()).optional()});

export const getApiV1CryptosCryptoCodeEventsResponse = z.array(z.object({eventId: z.number().int().optional(), type: z.enum(["newblock", "newtransaction"]).optional(), data: z.union([newBlockEvent, newTransactionEvent]).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
};

/**
 * Query event stream
 * 
 * GET /v1/cryptos/{cryptoCode}/events
 */
export const getApiV1CryptosCryptoCodeEvents = async (args: GetApiV1CryptosCryptoCodeEventsArgs, options: GetApiV1CryptosCryptoCodeEventsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/cryptos/${encodeURIComponent(String(args.cryptoCode))}/events${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(getApiV1CryptosCryptoCodeEventsResponse, await res.json())
};