import {z} from 'zod'

export type RpcRequest = {jsonrpc?: string | undefined, id?: (string | null | number) | undefined, method: string, params?: Array<unknown> | undefined};

export type CreateApiV1CryptosCryptoCodeRpcArgs = {cryptoCode: string, body: RpcRequest | Array<RpcRequest>};

export type CreateApiV1CryptosCryptoCodeRpcOptions = {baseUrl: string, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const rpcResponse = z.union([z.object({result: z.unknown()}), z.object({error: z.object({code: z.number().int(), message: z.string()})})]);

export const createApiV1CryptosCryptoCodeRpcResponse = z.union([rpcResponse, z.array(rpcResponse)]);

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
};

/**
 * Proxy RPC call to the underlying node
 * 
 * POST /v1/cryptos/{cryptoCode}/rpc
 */
export const createApiV1CryptosCryptoCodeRpc = async (args: CreateApiV1CryptosCryptoCodeRpcArgs, options: CreateApiV1CryptosCryptoCodeRpcOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/cryptos/${encodeURIComponent(String(args.cryptoCode))}/rpc${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiV1CryptosCryptoCodeRpcResponse, await res.json())
};