import ProviderEngine = require('web3-provider-engine');
import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
import Web3Subprovider = require('web3-provider-engine/subproviders/web3');
import * as Web3 from 'web3';

export const web3ProviderFactory = {
  getRpcProvider(protocol: string, host: string, port: number, path: string = ''): Web3.Provider {
     const provider = new ProviderEngine();
     const rpcUrl = `${protocol}://${host}:${port}${path}`;
     provider.addProvider(new RpcSubprovider({
         rpcUrl,
     }));
     provider.start();
     return provider;
  },
  getWeb3Provider(web3Provider: Web3.Provider): Web3.Provider {
    const provider: ProviderEngine = new ProviderEngine();
    provider.addProvider(new Web3Subprovider(web3Provider));
    provider.start();
    return provider;
  }
};