// Copyright 2017-2018 @polkadot/api-provider authors & contributors
// This software may be modified and distributed under the terms
// of the ISC license. See the LICENSE file for details.

import { JsonRpcRequest, JsonRpcResponse } from '../../types';
import { RpcCoder, RpcCoderState } from './types';

import decodeResponse from './decodeResponse';
import encodeJson from './encodeJson';
import encodeObject from './encodeObject';

export default function rpcCoder (): RpcCoder {
  const self: RpcCoderState = {
    id: 0
  };

  return {
    decodeResponse: (response: JsonRpcResponse): any =>
      decodeResponse(self, response),
    encodeJson: (method: string, params: Array<any>): string =>
      encodeJson(self, method, params),
    encodeObject: (method: string, params: Array<any>): JsonRpcRequest =>
      encodeObject(self, method, params),
    getId: (): number =>
      self.id
  };
}