import {z} from 'zod'

export type BlockIdVariant0 = number;

export type CryptoHash = string;

export type BlockId = BlockIdVariant0 | CryptoHash;

export type RpcGasPriceRequest = {block_id?: (BlockId | unknown) | undefined};

export type JsonRpcRequestForGasPrice = {id: string, jsonrpc: string, method: 'gas_price', params: RpcGasPriceRequest};

export type CreateApiGasPriceArgs = {body: JsonRpcRequestForGasPrice};

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

export const nearToken = z.string();

export const rpcGasPriceResponse = z.object({gas_price: nearToken});

export const rpcRequestValidationErrorKindVariant0 = z.object({info: z.object({method_name: z.string()}), name: z.literal("METHOD_NOT_FOUND")});

export const rpcRequestValidationErrorKindVariant1 = z.object({info: z.object({error_message: z.string()}), name: z.literal("PARSE_ERROR")});

export const rpcRequestValidationErrorKind = z.union([rpcRequestValidationErrorKindVariant0, rpcRequestValidationErrorKindVariant1]);

export const errorWrapperForRpcGasPriceErrorVariant0 = z.object({cause: rpcRequestValidationErrorKind, name: z.literal("REQUEST_VALIDATION_ERROR")});

export const rpcGasPriceErrorVariant0 = z.object({info: z.object({error_message: z.string()}), name: z.literal("INTERNAL_ERROR")});

export const rpcGasPriceErrorVariant1 = z.object({info: z.object({}), name: z.literal("UNKNOWN_BLOCK")});

export const rpcGasPriceError = z.union([rpcGasPriceErrorVariant0, rpcGasPriceErrorVariant1]);

export const errorWrapperForRpcGasPriceErrorVariant1 = z.object({cause: rpcGasPriceError, name: z.literal("HANDLER_ERROR")});

export const internalError = z.object({info: z.object({error_message: z.string()}), name: z.literal("INTERNAL_ERROR")});

export const errorWrapperForRpcGasPriceErrorVariant2 = z.object({cause: internalError, name: z.literal("INTERNAL_ERROR")});

export const errorWrapperForRpcGasPriceError = z.union([errorWrapperForRpcGasPriceErrorVariant0, errorWrapperForRpcGasPriceErrorVariant1, errorWrapperForRpcGasPriceErrorVariant2]);

export const jsonRpcResponseForRpcGasPriceResponseAndRpcGasPriceError = z.union([z.object({result: rpcGasPriceResponse, id: z.string(), jsonrpc: z.string()}), z.object({error: errorWrapperForRpcGasPriceError, id: z.string(), jsonrpc: z.string()})]);

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
};

/**
 * Gas Price
 * 
 * POST /gas_price
 */
export const createApiGasPrice = async (args: CreateApiGasPriceArgs, options?: CreateApiGasPriceOptions) => {
const {baseUrl = "https://rpc.mainnet.near.org", fetch: fetchFn = fetch} = options ?? {}

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

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