cic-staff-client/src/app/_helpers/accountIndex.ts

import { AccountRegistry } from '../../assets/js/eth_account_index';
// @ts-ignore
import * as accountIndex from '../../assets/json/accountIndex.abi.json';
import {environment} from '../../environments/environment';
const Web3 = require('web3');

const web3 = new Web3(environment.web3Provider);
// @ts-ignore
const abi = accountIndex.default;

export class AccountIndex {
  contractAddress: string;
  signerAddress: string;
  contract: any;

  constructor(contractAddress: string, signerAddress?: string) {
    this.contractAddress = contractAddress;
    if (signerAddress) {
      this.signerAddress = signerAddress;
    }
    this.contract = new AccountRegistry(web3, abi, this.contractAddress, this.signerAddress);
  }

  async totalAccounts(): Promise<number> {
    return await this.contract.count();
  }

  async haveAccount(address: string): Promise<boolean> {
    return await this.contract.have(address);
  }

  async addAccount(address: string): Promise<boolean> {
    return await this.contract.add(address);
  }

  async last(numberOfAccounts: number): Promise<Array<string>> {
    return await this.contract.last(numberOfAccounts);
  }

  async addToAccountRegistry(address: string): Promise<boolean> {
    if (!await this.contract.have(address)) {
      await this.contract.add(address);
      return await this.contract.have(address);
    } else {
      return await this.contract.have(address);
    }
  }
}