import Web3 from 'web3';
import { Web3Service } from '@app/_services/web3.service';

const abi: Array<any> = require('@src/assets/js/block-sync/data/AccountsIndex.json');
const web3: Web3 = Web3Service.getInstance();

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

  constructor(contractAddress: string, signerAddress?: string) {
    this.contractAddress = contractAddress;
    this.contract = new web3.eth.Contract(abi, this.contractAddress);
    if (signerAddress) {
      this.signerAddress = signerAddress;
    } else {
      this.signerAddress = web3.eth.accounts[0];
    }
  }

  public async totalAccounts(): Promise<number> {
    return await this.contract.methods.entryCount().call();
  }

  public async haveAccount(address: string): Promise<boolean> {
    return (await this.contract.methods.have(address).call()) !== 0;
  }

  public async last(numberOfAccounts: number): Promise<Array<string>> {
    const count: number = await this.totalAccounts();
    let lowest: number = count - numberOfAccounts;
    if (lowest < 0) {
      lowest = 0;
    }
    const accounts: Array<string> = [];
    for (let i = count - 1; i >= lowest; i--) {
      const account: string = await this.contract.methods.entry(i).call();
      accounts.push(account);
    }
    return accounts;
  }

  public async addToAccountRegistry(address: string): Promise<boolean> {
    if (!(await this.haveAccount(address))) {
      return await this.contract.methods.add(address).send({ from: this.signerAddress });
    }
    return true;
  }
}